Arcam DiVA A80 User manual

DiVA Service
Manual
A80 Amplifier
P80 Power Amplifier
Issue 1.0
ARCAM
ARCAM
Bringing music & movies to life
Bringing music & movies to life

Contents List
! Circuit description
o A80/P80
! Technical specifications
!
Circuit diagrams
o L943AY
! Transformers
o L916TX – 115/230VAC toroidal
o L917TX – 100VAC toroidal
o L907TX – 100VAC frame
! Exploded view diagram
o A80
!
Mechanical & packing parts list
o A80
o P80
! Circuit board silk screen
o A80
o P80
! Circuit board parts list
o A80/P80 combined

Circuit description.
Power supply.
The mains input to the unit is supplied at SK200 and is
filtered the Y Caps and locations C200 /C201 and X
cap at location C209, these are in-place to reduce
mains born HF interference and to prevent bridge
rectifier noise from leaving the unit.
The mains select switch at location SW200 works in
conjunction with the dual primaries on the 115/230v
transformers, the switch allows for the units to be used
in territories running a 115v or 230v grid when the
switch is set to the 115v position the primary windings
are connected in parallel.
Fig 1. Fuse value information.
Fuse location. Value.
FS200 T2.5A (20mm)
FS201 T2.5A (20mm)
FS200 (100v) T3.15A (20mm)
FS201 (100v) T3.15A (20mm)
FS202 (s.m standby 9v a.c rms) T500mA (s.m)
FS203 (D.C inline) T2.0A (20mm)
FS204 (D.C inline) T2.0A (20mm)
The standby Transformer TX200 continuously powers
the digital circuitry (+4.8v(D)) when power is
connected to the unit, this supply powers the Micro via
a regulating circuit based around regulator REG 201
special mention should be made of fuse FS202 as any
interruption to this supply will render the unit
completely lifeless and as such this circuit should be
checked before inspecting any other areas of the
board.
We will see that the main power transformer TX200
supplies a separate secondary winding for the +15 and
–15v analogue regulation stages via the two fuses at
board locations FS203 and FS204, the failure of either
of these fuses will cause the op-amps connected to the
regulated rails to swing D.C. The regulator at location
REG 200 regulates the +15 rail and intern supplies the
+5V(A) analogue supply via the reference Zener at
location DZ200 and drive transistor TR200.
The high level power amp A.C supplies arrive at
Con204 as a 4-wire supply this allows us to implement
a dual bridge network circuit with 4 individually
smoothed D.C rails these are labelled as +45(L),
+45(R) and -45(L), -45(R) we pull a –38v rail from this
point to form the VFD cathode bias voltage via R211
Con205 delivers the 3.3 V A.C supply to the main
board and then onto the display VFD via R203 (2R2
f.u).
Fig 2. Supply identification and related components.
Supply Related components
+ 45v L Left power amp positive rail.
+ 45v R Right power amp positive rail.
- 45v L Left power amp negative rail.
- 45v R Right power amp negative rail.
- 38v VFD Display cathode rail derived from –45v(R)
+15v (A) IC 300, 301, 302, 303, 304, 305, 306,
307, 308, 309 also including the input
clamp diodes all within the pre-amp stage.
- 15v (A) IC 300, 301, 302, 303, 304, 305, 306,
307, 308, 309 also including the input
clamp diodes all within the pre-amp stage.
+ 5v (A) IC309 volume control
+4.8 (D) Input trigger stages, signal detect IC700,
delayed off IC703, IC701. Main micro
IC600.Remote pickup, Master reset
IC601, Over current detect-AC detect –
thermal cut-out IC600
Fil 1/Fil 2 3.3v~ filament supply.
Pre-amp.
The A80 Pre-amp has inputs for Phono, Aux, CD, Tuner,
AV, DVD and Tape. All inputs except Phono have a simple
resistor-capacitor 340Khz low pass filter to remove any
unwanted high frequency noise from the input signal/local
area, a pair of diodes on each input connected to the
+15/-15v rails prevent damage to the CMOS input
switching chips at locations IC300 and IC301, if any offset
is seen at the input the switching chips on a given input we
may suspect the failure of one of the input diodes.
Fig 3. Logic status of IC302 and 303 (switching chip).
Low= 0V High=4.8 (Cmos).
Input. A0
(pin 1) A1 (pin 16) A2 (pin 15)
Phono
Low Low Low
Aux
Low High Low
CD
High High Low
Tuner
Low Low High
AV
High Low High
DVD
Low High High
Tape
High Low Low
The outputs of IC300 (L) and IC301(R) can be seen on pin
8 as a current signal and such this can not be viewed via
CRO although a 100 ohm resistor inline with the scope
probe may yield some results, from here we drive into line
drive op-amp IC307 (L) and IC308 (R) signal can be seen
at the output pin (1) and travelling into the volume control
chip (IC309) on pins 16 (L) and 9 (R) the output from the
Volume control is driven into IC307 at pin 6 (L) and IC308
pin 6 (R) and seen again on pins 7 on both IC307 and
IC308. After the Con 302 and Con 303 we drive directly

Into the power amp stages but from this point we can
configure the unit as a separate Pre amp/Power amp
by moving the jumpers to the pin 2 and 3 of Con 304
and Con 305, and then remove the jumpers at Con
302 and Con 303 this may also be of use when fault
finding as we can effectively isolate the and D.C
offset/distortion problems coming from the Pre amp
stage to the power amp stages and test these stages
as a separate entity.
The Pre amp power up mute and power down mute is
controlled by the relay at location RLY300 A/B the
relay also triggers to mute the switching noise when
switching between inputs (see micro control/protection
and display section).
Power amp stages.
The main power amplifiers are of a Class A/B design
which use SAP “audio” transistors in a asymmetrical
current feedback configuration, Input and feedback
paths are D.C coupled and there is a active integrating
servo to remove D.C offsets from the outputs.
The basic principle of operation is as follows: Left
channel description given only, read all references as
5xx for the right channel.
The input level of the power amp stage is clamped by
the 3V9 zener diodes at positions DZ402 and DZ403
this protects the power amp input stages from gross
overload and subsequent damage R410 and R402 and
C416 in parallel form a 340khz filter.
IC400A is a V-I converter with a gain of 2 it’s output
will be a accurate amplification of it’s input voltage (i.e
the output voltage at pin 1 will be identical to the input
at pin 3 but twice the amplitude) the output voltage is
driven unto a 44 ohm load formed by R445 and R446
this op-amp is used in a slightly unusual configuration
in that it’s power supply pins are used as a current
output and the output pin is used as a current
feedback. Transistors TR404 and TR408 supply the +/-
15v rails and act as cascades to pass it’s supply pin
currents through to the current mirrors.
The “feedback current” flows back from the power amp
output via R447-R450 to allow IC400A to swing it’s
output, this is why the term current feedback is used –
it’s is the current flowing in the feedback resistors that
sets the overall gain of the amplifier.
IC400B acts as an inverting integrator and it’s purpose
is to remove DC from the loudspeaker outputs. Any
positive D.C offset will cause the output of IC400B to
go negative thus increasing the current in it’s negative
supply pin and pulling the output voltage back to zero
R420 and C442 set the time constant of the integrator
so that audio frequencies are ignored
The transistors found at locations TR400 and
TR401/TR402 form the PNP Wilson mirrors and TR416
and TR411/TR417 form the Wilson NPN current mirrors,
emitter degeneration is provided by R405, R406 (+) and
R407, R408 (-).
R415 and R416 decouple the current mirror stages from
the main power supply stages to allow the bootstrap circuit
to operate this circuit is formed by C423 and C424 and the
Metal film 1 watt resistors at locations R452/R453, the
boots strap is provided to allow the output stage rails to go
up and down slightly with the output signal to the
loudspeaker, this enables the driver stage to fully saturate
the output drivers giving the greatest output and the best
thermal efficiency.
TR405 and TR407 are the Pre-drivers, TR412/TR414 and
R411/R434 provide a current limit of about 30mA under
fault conditions. R423 and R428 loosely couple the
outputs of the output drivers to the inputs of the SAP
output devices, this allows the output devices inbuilt
temperature sensing diodes to accurately control the
quiescent current of the output drivers as the temperature
varies, C425 and C405 ensure that both halves of the
output stage receive an equal A.C component.
The output transistors are TR413 and TR415 these are
specially designed for audio power use Sanken SAP15N
and SAP15P devices they provide a inbuilt 0W22 thick film
power resistor and temperature sensing diodes that track
the V
BE versus temperature characteristics of the power
transistors allowing for accurate control of the quiescent
current.
R459 and C427 form the Zobel network which is provided
to ensure that the amplifier see a constant and resistive
load at high frequencies C421 locally couples the “High
frequency” and signal grounds together at the input stage
for the same reason. Any signs of burning or scorching of
R459 will indicate that the unit amplifier channel(s) have
been running unstable or oscillating.
The Bias should be set for minimum distortion (THD+N)
using a 0.5v rms 20 Khz sine wave into the CD input with
the amplifier set for full gain, the absolute maximum level
of Bias acceptable is 22mV measure across CON401 (L)
or CON 501 (R) the adjustment is made using RV400 and
RV500 we set the bias at the factory using an extremely
accurate Audio Precision-audio analyser.
If you do not have access to a distortion level meter
capable of 0.05% or better accuracy you may be able to
rough set the amplifier to a typical reading of 15mV (at
cold switch on).

Fig 4. Suggested blanket replacement parts for
power amp failures.
Location Description Model Part no.
TR413 Output driver + SAP15NY 4CSAP15N
TR415 Output driver - SAP15PY 4CSAP15P
TR410 Predriver + FMMT 497 4AFMMT497
TR412 Predriver + ZDT 6758 4AZDT6758
TR414 Predriver - ZDT 758 4AZDT758
TR405 Predriver - FMMT 597 4AFMMT597
TR401 Current mirror PNP BC859B 4A859
TR402 Current mirror PNP FMMT 597 4AFMMT597
TR411 Current mirror NPN FMMT 497 4AFMMT497
TR417 Current mirror NPN BC849B 4A849B
TR412 Driver bias + ZDT 6758 4AZDT758
Fig 4a. SAP NY/PY output driver information.
SAP 15NY SAP 15PY
S-E = 0.22 ohm.
Under output driver failure conditions the 0.22 internal emitter
resistor will usually go open, the resistor should be measured between
pins S and E.
Micro control/protection and display.
The micro is tasked with providing an instantaneous safe
operating area for both the amplifier and loudspeaker by
monitoring the below areas.
o D.C at both left and right channel outputs.
o Over current within either power amp stage.
o Over temp detection for both power amp stages.
o A.C present detection.
Please see fig 5. For voltage readings with regards to the protection
operations.
Within the A80 integrated amplifier these tasks are
performed by the H8 type micro at circuit location IC602,
within the P80 power amp version the tasks are performed
by the PIC micro at location IC603, the protection lines are
“daisy chained” to both micros regardless of witch one is
fitted.
To operate both micros require a constant stable supply
voltage, this is derived from the +4.8v(D) rail from
transformer TX200 and via regulator REG201 this supply
should be constant at anytime mains appears at the
amplifier power input.
Please note: This supply is protected from over-current
and over-voltage operation by the surface mount fuse at
location FS202 T500mA and as such if the Amplifier fails
to power up this supply should be checked before making
any further investigations.
We also need to see a 4.00 Mhz clock at crystal location
X600.
The micro interfaces with the pre-amp stage input
selection (see Fig 3) and the volume control level
adjustment we also drive the VFD via the display
drive/keyboard scan micro at location IC800.
IC602 receives Keyboard scan data and RC5 from the
remote pick-up diode at location RX800. The master
power on reset can be found on the display board and
switches HI (4.8v) after mains in.
Fig 5. Working status of protection lines and fault
status.
Low =0v High = 4.8 (Cmos).
Location Fault Line Output pin Working
IC 601A AC present 2 High
IC 600A Over current 3 Low
IC 600B Therm prot (L) 6 High
IC 600D Therm prot (R) 11 High
IC 600C Therm prot main 8 Low
R634 D.C prot (L) N/A Low (D.C)
R635 D.C prot (R) N/A Low (D.C)
R663 D.C prot combined N/A Low

The Protection is live at all times that even in standby
due to the fact that all chips related with these
functions are driven from the 4.8(D) supply rails.
As we can see from Fig 4 we can isolate the left and
right channel protection lines for both over current and
D.C offset by looking at the protection lines before they
are mixed into single fault status lines for the micro at
location IC600 this will allow us to identify the channel
that is “flagging the fault”.
Both versions of the Amplifier have the ability to warn
the user and/or engineer of a internal fault, the A80 will
use both the Power LED and front panel display, the
P80 has no display and as such uses the sequence of
LED flash codes listed below in Fig 7.
Fig 6. A80 fault alert information.
Power LED status Fault indicated
LED red during start up DC offset fault
Led red during normal use Fault as shown on display
Fig 7. P80 fault alert information.
Power LED status Fault indicated
LED flashing green DC offset (left or right)
Flashing red Short circuit fault (over current)
Flash amber Thermal fault (heatsink L or R)
Red on flash green Multiple protection lines triggered
The Micro has direct control over all internal relays for
protection and output control, the speaker relay control
lines can be seen on the diagram as SPKR1 for SP1
and the SPKR2 for SP2 outputs, these lines switch
High to engage the relay.
The A80 pre-amp relay should disengage when
switching inputs to prevent any chip switching noise
from leaving the pre-amp stage the control line can be
seen on R385 and switches High to engage the relay.
Signal Detect and Delayed off – P80 only.
Signal detection is achieved by amplifying the signal
present at the power amp inputs by a large amount
using two channels of a quad op-amp at location
IC700 A/B the outputs of this op-amp are summed by
a non-inverting comparator formed using the two
remaining op-amp channels these will produce a active
High reset pulse at the output pin 14.
When mains is plugged into the P80, the master
*Reset line goes low and the 0.38Hz clock starts
ticking. The *Reset pulse resets the latch effecting a
HIGH *Q output and thus a LOW circuit output. When
the signal detect Latch and Counter Reset go HIGH
(an input is detected), the *SD latch input is driven
LOW by the inverter and *Q goes LOW the circuit
output then goes high switching the Amplifier on.
If the Amplifier does not see audio on it’s Power amp
inputs for either 12 or 45 minutes (this can be user
configured by moving the jumper at position CON702) the
Amplifier will auto switch into standby.
Jumper settings.
If you want to turn the A80 into a separate Pre-Power amp
(make the Line out become a Pre-amp out and make the
pre-out become a power amp in) adjust the setting of the
following links.
Remove the jumpers from Con 302 and Con 305 (this
disconnects the pre-amp output from the power amp input)
Fit jumpers on pins 2 & 3 of Con 304 & Con 305
(disconnects the line output buffer from the line out
sockets and connects the pre out sockets to the line out
sockets)
You can change the Phono input of the A80 into a AUX2
input by fitting jumpers on pins 2 & 3 of Con 306 an Con
307 this routes the signal directly from the Phono inputs
into a separate set of inputs on the pre-amp switches
IC302 and IC303.
We need to enable the AUX2 input by pressing AV,TAPE
and PHONO now use the rotary encoder to change the
selection, press confirm to select the new setting.
Con 400 and Con 500 are for the Bias setting and should
not be altered, if in doubt you should not measure more
than 22mV across Con 401 and Con 501 when the
amplifier is idle and this should be adjustable using RV400
and RV500 (L&R channels).
Con 601 and Con 602 are for re-programming (move the
jumper from Con 601 to Con 602 when reprogramming
otherwise the jumper should be on Con 601).
Con 700 and Con 701 are used to set the P80 signal
detect sensitivity as default the link is fitted giving a input
sensitivity of roughly ~500uV if the jumpers are removed
the sensitivity decreases roughly x4 to 2mV this setting
can be used for operation with noisy source equipment.
Con 702 is used to set the time coefficient of the auto
power off delay, the default pins are 1 & 2 this gives a
delay of 12 minutes until the amp powers down under a no
signal period, if we place the jumpers on pin 2 & 3 this
time increases to 45 minutes +/- 20%.
Fig 8. Jumper settings.
Jumper A80 P80
Con 300, Con 301 Not fitted Fitted
Con 302, Con303 Fit (NF for pre/pwr) Not fitted
Con 304, Con 305 1&2 (2&3 for
pre/pwr)
Not fitted
Con 306, Con 307 1&2Phono;(2&3
Aux2)
Not fitted
Con 400,Con 500 Factory set Factory set
Con 601 Fit (NF to program) Not fitted
Con 602 Fit (NF to program) Not fitted
Con 700, Con 701 Not fitted Fit (0.5mv), NF (2mV)
Con 702 Not fitted 1&2 (12 mins; 2&3
45mins).

Fig 9. Major components pin identification.
74HC14
TLO 72
NJM2114
DG408DY
74HC00D
ZDT 758/ZDT 6758
1=Collector 1
2=Collector 1
3=Collector 2
4=Collector 2
5=Emitter 2
6=Base 2
7=Emitter 1
8=Base 1
FMMT 497/597
BC849/BC859
1=Base
2=Emitter
3=Collector
BAV99 Diode package
1=Anode
2=Cathode
3=Common connection
LM431 Adjustable Zener shunt regulator

Technical Specifications.
Continuous Power output
Both channels driven 8 ohms 20 Hz – 20 kHz = 65 Watts
Single Channel driven 4 ohms 20 Hz – 20 kHz = 80 Watts
Distortion 8 ohms at 80% power output 1Khz = 0.008%
Input stage specifications.
RIAA input stage sensitivity (M.M) = 2.5 mV
Line input sensitivity = 630 mV (Default)
Input impedance = 22k ohms
Signal to noise ratio CCIR weighted (2 volt input) = 105dB
Pre-amp output specifications.
Nominal output level = 610 mV
Output impedance = < 3 ohms

ISSUE
DRAWING NO.
DRAWING TITLE
DATE
Filename:
ECO No. DESCRIPTION OF CHANGE
L943C1_5.1.SCH
A80/P80 - Top Level Sheet
Contact Engineer:
L943C1
9-Sep-2003
INITIALS
Printed:
18Sheet of
Notes:
Contact Tel: [phone]Mark Tweedale
A & R Cambridge Ltd.
Pembroke Avenue
Cambridge CB5 9PB
Waterbeach
23425
-45V_R
+45V_R
0V(SIG)
-45V_L
+45V_L
0V_LS_L
+4.8V(D)
9VRMS
PWR_ON
-38V_VFD
0V(D)
0V_HF_L
0V_FB_L
0V_FB_R
0V_HF_R
0V_LS_R
+15V(A)
+5V(A)
-15V(A)
0V(PSU)
FIL_1
FIL_2
0V(SIG_2)
Power Supplies
L943C2_5.1.SCH
PRE_OUT_L
0V_FB_L
OUTPUT_L
0V_LS_L
0V_HF_L
VIPROT_L
+45V_L
-45V_L
Power Amp Left
L943C4_5.1.SCH
+45V_L
0V(D)
D100
1N4003
DO-41
TR100
BD179
TO-126
TR101
BD179
TO-126
RLY100A
Omron
G5Z-2AE
RLY101B
Omron
G5Z-2AE
RLY100C
Omron
G5Z-2AE
RLY101C
Omron
G5Z-2AE
RLY100B
Omron
G5Z-2AE
RLY101A
Omron
G5Z-2AE
D101
1N4003
DO-41
2
3
1
NCL
CL
CR
NCR
L
R
SKT100
HOSIDEN
HLJ
Right Outputs
Left Outputs
OUTPUT MUTING
0V_LS_L
0V_LS_R
ITEM100 1 Blank PCB Diva A80 AmpL943PB
PRE_OUT_R
0V_FB_R
OUTPUT_R
0V_LS_R
0V_HF_R
VIPROT_R
+45V_R
-45V_R
Power Amp Right
L943C5_5.1.SCH
9VRMS
+4.8V(D)
+45V_R
+45V_L
0V(D)
0V_LS_L
0V_LS_R
0V_HF_L
0V_HF_R
0V_FB_R
0V_FB_L
0V(SIG)
-45V_L
-45V_R
-38V_VFD
+15V(A)
-15V(A)
+5V(A)
TAPE_0
VOL_SCLK
0V(SER)
VOL_SDATA
LISTEN_0
LISTEN_1
LISTEN_2
+15V(A)
+5V(A)
-15V(A)
0V(SIG)
0V_FB_R
TAPE_0
TAPE_1
VOL_SCLK
0V(SER)
VOL_SDATA
LISTEN_0
LISTEN_1
LISTEN_2
*PRE_MUTE
0V(D)
+45V_L
-45V_L
0V_HF_L
+45V_R
0V(D)
0V_HF_R
0V_FB_L
-45V_R
-38V_VFD
9VRMS
-45V_L
+4.8V(D)
+45V_L
+45V_R
PreAmp Controls
Power Supplies
Flexfoil
SPKR1_ON
SPKR2_ON
FIL_1
FIL_2
FIL_1
FIL_2
0V(SIG)
FD100 FD101
Q113
Q114
Q115Q118
TAPE_1
TAPE_2
TAPE_2
A80 & P80 Display Circuitry
L943C8_5.1.SCH
PRE_OUT_L
PRE_OUT_R
0V_PREOUT
0.38Hz_CLK
0V(D)
+4.8V(D)
+45V_L
0V_CHASS
REMOTE_P
TRIG_IN
*RESET
REMOTE_N
A80 Trigger, RC5 & P80 Sig Detect
L943C7_5.1.SCH
0V(D)
+4.8V(D)
-38V_VFD
LISTEN_2
LISTEN_1
LISTEN_0
*PRE_MUTE
VOL_SDATA
VOL_SCLK
TAPE_0
VIPROT_R
VIPROT_L
+45V_R
-45V_L
+45V_L
OUTPUT_L
OUTPUT_R
0V_SER
0V_D_PRE
0V(SIG)
TAPE_1
TAPE_2
0.38Hz_CLK
9VRMS
FIL_1
FIL_2 SPKR2_ON
PWR_ON
SPKR1_ON
*RESET
REMOTE_P
TRIG_IN
+4.8V_D_PRE
VOL_*CS
REMOTE_N
A80/P80 Protection & Micros
L943C6_5.1.SCH
PRE_OUT_L
PRE_OUT_R
LISTEN_2
LISTEN_1
LISTEN_0
*PRE_MUTE
VOL_SDATA
VOL_SCLK
-15V(A)
+15V(A)
+5V(A)
TAPE_2
0V(SIG)
0V_D_PRE
0V_SER
0V_PREOUT
TAPE_1
TAPE_0
+4.8V_D_PRE
*PRE_RLY
VOL_*CS
0V(SIG_2)
A80 PreAmp
L943C3_5.1.SCH
0V(D)
+4.8V(D)
+45V_L
C101
100N
50V
0805
0V(D)
*PRE_MUTE
0V(D)
FIX100
Dia 3.5mm
1
FIX101
Dia 3.5mm FIX102 Dia 3.5mm FIX103 Dia 3.5mm
Q121
Q125
ITEM101 1 Tape D/Sided 12MM X 70MM DS Polyester 4965F205 Placed between VFD and PCB; NF ON P80
R104
330R
1W
CF
R105
330R
1W
CF
R107
100R
1W
CF
R106
100R
1W
CF
RLY102A
NEC
EB2-5NU
RLY102B
NEC
EB2-5NU
RLY102C
NEC
EB2-5NU
HEADPHONE OUTPUT & MUTE
(NF ON P80)
R102 0R0
0W125 0805
R103 0R0
0W125 0805
NF
NF
1
2
3
4
5
CON100
AMP
CT
1
2
3
4
5
CON101
AMP
CT
Q116
Q117
FIX104
Dia 3.2mm L100
2U2
R100
5R6
2W
CF
L101
2U2
R101
5R6
2W
CF
D102
BAS16
SOT-323
Q106
Q111
ANNOTATION
R110
220R
0W25
MF
R111
220R
0W25
MF
P101
LS100
G P PRECISION
LS101
G P PRECISION
R112
2K2
0W125
0805
R113
2K2
0W125
0805
ITEM102 1 Earth Lead Assy 75MM8M101
ITEM103 2 Pad Damping 15x6x3MM SorbothaneE802AP
VOL_*CS
VOL_*CS
R114
0R0
0W25
MF
R108 220R
0W25 MF
R109 220R
0W25 MF
0V(SIG_2)
0V(SIG_2)
Rubber O-Rings fitted over main power supply caps
GENERAL NOTES
This is the Master Schematic for A80 (L943AY) and P80 (L944AY) PCB
assemblies. Any changes to the schematics in this document must be
reflected in the relevant child documents.
These schematics follow a simple heirarchy scheme. Sheet symbols on the top
sheet represent a child or sub-sheet. Net labels on sub-sheets are local or
specific to that sheet. Ports on the sub-sheets connect to sheet entries on
the parent sheet, where they are connected together.
Primary power nets are denoted by type in parenthesis, e.g. 0V(D).
Secondary nets are denoted by underscores, e.g. 0V_LS_L.
To perform an electrical rule check or synchronise with the PCB, set Net
Identifier Scope to Sheet Symbols/Port Connections.
Placed on output relays
Soldered to SKT200
When generating BOMs for L943AY or L944AY, ensure that the relevant
components are fitted or not fitted (those with "NF" or "FIT" in the nearby text).
ITEM104 4 13/16 inch O-RingF232
03_E116 TGP NO CHANGE TO THIS SHEET 2.117 APR 03
03_E120 TGP 13 May 03 LEDs, BIAS & DOCUMENTATION CHANGE 3.0
03_E147 MJT 23 May 03 None to this sheet. PCB change. 4.0
03_E230 MJT 04 Aug 03 5.0
A80
Changed P80 s/w & fitted IC socket for IC603 (P80 only).
Display snapoff fixing holes reduced to 3.2mm
03_E264 MJT 09 Sept 03 None to this sheet. Remove EMCcan from around IEC inlet. 5.1

ISSUE
DRAWING NO.
DRAWING TITLE
DATE
Filename:
ECO No. DESCRIPTION OF CHANGE
L943C2_5.1.SCH
A80/P80 Power Supplies
Contact Engineer:
L943C2
9-Sep-2003
INITIALS
Printed:
28Sheet of
Notes:
Contact Tel: [phone]Mark Tweedale
A & R Cambridge Ltd.
Pembroke Avenue
Cambridge CB5 9PB
Waterbeach
23425
EARTH
MAINS WIRING AND AUXILIARY SUPPLY
0V(D)
+4.8V(D)
0V(D)
+4.8V(D)
ANALOGUE OP-AMP SUPPLIES
-15V(A)
+15V(A)
EMC Shield
SH200
1
L
N
E
SKT200
BULGIN
PX0580
C200
3N3
250V
CER
C201
3N3
250V
CER
C209
220N
275V
PP X2
LIVE
NEUTRAL
FHLDR200
20mm HLDR
FHLDR201
20mm HLDR
C203
3N3
250V
CER
C202
3N3
250V
CER
RLY200B
Takamisawa
F1CA005V
RLY200A
Takamisawa
F1CA005V
RLY200C
Takamisawa
F1CA005V
C204
470N
100V
MKS2
C210
100N
50V
0805
C211
100N
50V
0805
C215
1000UF
35V
YK
C216
1000UF
35V
YK
ADJ
REG202
LM337T
TO-220
ADJ
REG200
LM317T
TO-220
C217
100UF
25V
YK
C218
100UF
25V
YK
C224
1000UF
25V
YK
C221
100N
100V
MKS2
PWR_ON
0V(D)
+4.8V(D)
9VRMS
POWER AMP SUPPLIES
C205
470N
100V
MKS2
DBR201
GBU8D
+45V_R
-45V_R
-45V_L
+45V_L
-38V_VFD
VFD SUPPLY
0V_LS_L
0V_HF_L
TR200
BC849B
SOT-23
0V_LS_R
R215
2K2
0W125
0805
0V(D)
0V(SIG)
0V_HF_R
+5V(A)
DBR200
GBU8D
C206
470N
100V
MKS2
C219
100UF
25V
YK
+4.6V to +5.3V
ADJ
REG201
LM317T
TO-220
C225
1000UF
25V
YK
0V_LS_R
0V_HF_R
0V_HF_L
0V_LS_L
0V(SIG)
R217
680R
0W125
0805
0V_FB_L
0V_FB_R
0V_FB_L
0V_FB_R
Track by pre-out to pwr-in
0V(SIG)
SP202
0V(PSU)
D214
BAS16
SOT-323
D210
BAS16
SOT-323
D211
BAS16
SOT-323
D212
BAS16
SOT-323
D213
BAS16
SOT-323
D215
BAS16
SOT-323
C220
100UF
25V
YK
DZ200
BZX84C
5V6
SOT-23
C228
3,300UF
63V
USR
C229
3,300UF
63V
USR
C230
3,300UF
63V
USR
C231
3,300UF
63V
USR
FIL_1
FIL_2
ORANGE 1
BLUE 2
ORANGE 3
CON200
WAGO 256
R219
22R
0W125
0805
PCB Traces to route as shownhere
1A
1
1B
2A 2 2B
115V 230V
SW200
18-000-0019
(NF ON P80)
R214
2K2
0W125
0805
R213
2K2
0W125
0805
R210
100R
0W125
0805
R209
100R
0W125
0805
R207
100R
0W125
0805
R208
100R
0W125
0805
BLUE
BLACK
ORANGE
GREEN
BLACK
GREY
BLUE
GREEN/YELLOW
Interwinding Screen
115V ac
115V ac
16Vac
16Vac
ORANGE
BLUE
ORANGE
WHITE
L916TX
(CHASSIS-MOUNTED)
3.2Vac
WHITE
WHITE
TR202
FMMT497
SOT-23
R216
2K2
0W125
0805
R206
10R
0W125
0805
C226
1000UF
10V
YK
ANNOTATION
R218
220R
0W25
MF
1
FIX200
Dia 3.2mm
DBR203
3BDF01M
HS200A
6043PB
23C/W
HS202A
6043PB
23C/W
HS201A
SW50-2
8.8C/W
ITEM203 1 Clip For SW Profile HeatsinkF006
D200
1N4003
DO-41
D203
1N4003
DO-41
D202
1N4003
DO-41
D201
1N4003
DO-41 C213
100N
50V
0805
C214
100N
50V
0805
(NF ON P80)
115V
115V
6
4
2
1 5
8
9V
9V
3 7
TX200
PCB Mount Frame
7A9301
0V(D)
SP200
SP201
R221 0R0
0W125 0805
R203
2R2
0W33
FU
FS200
T2.5A
S506
FS201
T2.5A
S506
FS202
T500mA
R452
BLUE
3
DK GREY
2
ORANGE
1
CON201
WAGO
256
GREEN
1
CON202
WAGO
256
GREY 4
DK GREY 3
LT GREY 2
BLUE 1
CON204
WAGO
256
GREY 2
GREY 1
CON205
WAGO
256
GREEN
1CON203
WAGO
256
C212
22UF
63V
YK
0V(D)
R211
1K0
0W125
0805
C222
100N
50V
0805
0V(SIG_2)
SP203
0V(SIG_2)
For preamp bulk decoupling
P201
P200
P202
FS204
T2A
R452
FS203
T2A
R452
03_E116 TGP R204, R205 CHANGED FROM 2R2 TO 0R 2.117 APR 03
R204
0R0
0W125
0805
R205
0R0
0W125
0805
03_E120 TGP 13 May 03 LEDs, BIAS & DOCUMENTATION CHANGE 3.0
03_E147 MJT 23 May 03 Removed double connection from R221 to star point. PCB change. 4.0
03_E230 MJT 04 Aug 03 None to this sheet. Display snapoff fixing holes reduced to 3.2mm 5.0
A80
C207
22UF
20V
OSCON
C208
22UF
20V
OSCON
03_E264 MJT 09 Sept 03 Remove EMC can from around IEC inlet. 5.1
This EMC can should now not appear
on any BoMas there is a safety
issue regarding the can shorting to a
live mains track on the top layer.
Consider removing the holes for the
can or perhaps move mains tracks
onto bottom layer for next PCB
revision.
NF

ISSUE
DRAWING NO.
DRAWING TITLE
DATE
Filename:
ECO No. DESCRIPTION OF CHANGE
L943C4_5.1.SCH
A80/P80 - Power Amp Left
Contact Engineer:
L943C4
9-Sep-2003
INITIALS
Printed:
48Sheet of
Notes:
Contact Tel: [phone]Mark Tweedale
A & R Cambridge Ltd.
Pembroke Avenue
Cambridge CB5 9PB
Waterbeach
23425
0V_FB_L
PRE_OUT_L
0V_HF_L
0V_LS_L
0V_HF_L
VIPROT_L
OUTPUT_L
0V_LS_L
0V_HF_L
+45V_L
-45V_L
0V_HF_L
0V_HF_L
BIAS MEASURE BIAS
INPUT FILTER V TO I AMP
INTEGRATING DC SERVO
PNP CURRENT MIRROR
NPN CURRENT MIRROR
PRE DRIVER
PRE DRIVER
OUTPUT STAGE V-I PROTECTION
V-I PROTECTION
VI PROTECT
SIGNAL TO MICRO
ZOBEL NETWORK
BOOTSTRAPBOOTSTRAP
DZ404
BZX84C
15V
SOT-23
C410
100UF
25V
YK
TR408
FMMT497
SOT-23
C417
100N
50V
0805
C416
470P
100V
FKP2
C419
100N
50V
0805
C420
100N
50V
0805
C422
470N
100V
MKS2
C402
100P
100V
0805
C414
100UF
25V
YK
C425
10UF
50V
YK
C423
100UF
100V
YK
C405
10N
100V
0805
C424
100UF
100V
YK
C412
100UF
25V
YK
C413
100UF
25V
YK
C426
10UF
50V
YK
C427
100N
100V
MKS2
C421
100N
50V
0805
R422
100R
0W125
0805
R427
100R
0W125
0805
R424
100R
0W125
0805
R443
4K7
0W125
0805
R420
1M0
0W125
0805
TR407
FMMT497
SOT-23
TR402
FMMT597
SOT-23
R431
22R
0W125
0805
R410
1K0
0W125
0805 R402
22K
0W125
0805
2
31
84
IC400A
TL072CD
SO-8
6
5
7
IC400B
TL072CD
SO-8
TR404
FMMT597
SOT-23
DZ405
BZX84C
15V
SOT-23
TR411
FMMT497
SOT-23
R434
22R
0W125
0805
TR405
FMMT597
SOT-23
D401
BAS16
SOT-323
R411
1K0
0W125
0805
R454
100K
0W125
0805
R456
330R
0W125
0805
R425
100R
0W125
0805
D402
BAS16
SOT-323
TR409
FMMT497
SOT-23
TR406
FMMT597
SOT-23
TR410
FMMT497
SOT-23
TR403
FMMT597
SOT-23
R414
1K0
0W125
0805
1
2
CON401
HARWIN
M20-973
R457
330R
0W125
0805
R429
100R
0W125
0805
R430
100R
0W125
0805
D403
BAS16
SOT-323
D406
1N4003
DO-41
D407
1N4003
DO-41
R459
5R6
2W
CF
R436
10K
0W125
0805
R442
4K7
0W125
0805
R426
100R
0W125
0805
DZ400
BZX84C
22V
SOT-23
DZ401
BZX84C
22V
SOT-23
R441
10K
0W125
0805
R438
10K
0W125
0805
TR416
BC849B
SOT-23
TR417
BC849B
SOT-23
TR400
BC859B
SOT-23
TR401
BC859B
SOT-23
SHEET 3
R406
47R
0W125
0805
R407
47R
0W125
0805
R405
47R
0W125
0805
R408
47R
0W125
0805
R416
220R
0W25
MF
R415
220R
0W25
MF
R445
22R
0W25
MF
R446
22R
0W25
MF
R432
22R
0W125
0805
R435
22R
0W125
0805
R452
1K0
1W
CF
R453
1K0
1W
CF
D404
BAS16
SOT-323
D400
BAS16
SOT-323
C408
22UF
63V
YK
C409
22UF
63V
YK
0V_HF_L
0V_HF_L
C403
100P
100V
0805
RV400
220R
LIN
DZ406
BZX84C
3V9
SOT-23
0V_FB_L
0V_FB_L
0V_FB_L
NF
PRE DRIVER BIAS
& TEMP. COMP.
->
NF
R444
10K
0W125
0805
C400
47P
100V
0805
R413
1K0
0W125
0805
0V_HF_L
R400
22K
0W125
0805
R404
22K
0W125
0805
R401
10K
0W125
0805
C407
10N
100V
0805
C404
10N
100V
0805
R433
22R
0W125
0805
C411
100UF
25V
YK
C406
10N
100V
0805
* - Default jumper setting on pins 2 & 3; fit jumper
~1.6V
NF
C401
47P
100V
0805
R403 10K
0W125 0805
C415
100UF
25V
YK
remove jumper to decrease bias voltage
on pins 1 & 2 to increase bias voltage;
Q403
Q409
D405
1N4003
DO-41
D408
1N4003
DO-41
0V_FB_L
0V_FB_L
ADJUST
TR413
SAP15NY
SAP
TR415
SAP15PY
SAP
ITEM400 1 Con Jumper Socket 0.1IN Gold Blue8K004
TR414A
ZDT758
SM-8
TR414B
ZDT758
SM-8
TR412A
ZDT6758
SM-8
TR412B
ZDT6758
SM-8
R449
820R
0W25
MF
R450
820R
0W25
MF
R447
820R
0W25
MF
R448
820R
0W25
MF
R409
1K0
0W125
0805
R412
1K0
0W125
0805
NF
NF
ANNOTATION
REF400
LM431AIM3
SOT-23
DZ402
BZX84C
3V9
SOT-23
DZ403
BZX84C
3V9
SOT-23
R419
470K
0W125
0805
R421
470K
0W125
0805
D409
BAV99
SOT-23
NF
R451 18K
0W25 MF R458 18K
0W25 MF
P401
P402
P404
P405
P420
P407
P409
P408
P410 P411
P427 P429
P430
P431
P432
P413
P414
P415
P440
P449
P451
P452
P433
P454
P456
P438
P439
P442
P458
P459
P444
R423
220R
0W25
MF
R428
220R
0W25
MF
0V_FB_L 0V_FB_L
0V_FB_L
0V_FB_L
OUT_L
R417
1K0
0W125
0805
R418
1K0
0W125
0805
R460
330R
0W125
0805
R440 4K7
0W125 0805
R439
22K
0W125
0805
1 2 3
CON400
HARWIN
M20-973
*
P403
P406
P400
NF
NF
03_E116 TGP NO CHANGE TO THIS SHEET 2.117 APR 03
03_E120 TGP 13 May 03 LEDs, BIAS & DOCUMENTATION CHANGE 3.0
R437
5K6
0W125
0805
03_E147 MJT 23 May 03 None to this sheet. PCB change. 4.0
03_E230 MJT 04 Aug 03 None to this sheet. Display snapoff fixing holes reduced to 3.2mm 5.0
A80
03_E264 MJT 09 Sept 03 None to this sheet. Remove EMC can from around IEC inlet. 5.1

ISSUE
DRAWING NO.
DRAWING TITLE
DATE
Filename:
ECO No. DESCRIPTION OF CHANGE
L943C5_5.1.SCH
A80/P80 - Power Amp Right
Contact Engineer:
L943C5
9-Sep-2003
INITIALS
Printed:
58Sheet of
Notes:
Contact Tel: [phone]Mark Tweedale
A & R Cambridge Ltd.
Pembroke Avenue
Cambridge CB5 9PB
Waterbeach
23425
->
0V_FB_R
PRE_OUT_R
0V_HF_R
0V_LS_R
0V_HF_R
VIPROT_R
OUTPUT_R
0V_LS_R
0V_HF_R
+45V_R
-45V_R
0V_HF_R
0V_HF_R
BIAS MEASURE BIAS
INPUT FILTER V TO I AMP
INTEGRATING DC SERVO
PNP CURRENT MIRROR
NPN CURRENT MIRROR
PRE DRIVER
PRE DRIVER
OUTPUT STAGE V-I PROTECTION
V-I PROTECTION
VI PROTECT
SIGNAL TO MICRO
ZOBEL NETWORK
BOOTSTRAPBOOTSTRAP
DZ504
BZX84C
15V
SOT-23
C510
100UF
25V
YK
TR508
FMMT497
SOT-23
C517
100N
50V
0805
C516
470P
100V
FKP2
C519
100N
50V
0805
C520
100N
50V
0805
C522
470N
100V
MKS2
C502
100P
100V
0805
C514
100UF
25V
YK
C525
10UF
50V
YK
C523
100UF
100V
YK
C505
10N
100V
0805
C524
100UF
100V
YK
C512
100UF
25V
YK
C513
100UF
25V
YK
C526
10UF
50V
YK
C527
100N
100V
MKS2
C521
100N
50V
0805
R522
100R
0W125
0805
R527
100R
0W125
0805
R524
100R
0W125
0805
R543
4K7
0W125
0805
R520
1M0
0W125
0805
TR507
FMMT497
SOT-23
TR502
FMMT597
SOT-23
R531
22R
0W125
0805
R510
1K0
0W125
0805 R502
22K
0W125
0805
2
31
84
IC500A
TL072CD
SO-8
6
5
7
IC500B
TL072CD
SO-8
TR504
FMMT597
SOT-23
DZ505
BZX84C
15V
SOT-23
TR511
FMMT497
SOT-23
R534
22R
0W125
0805
TR505
FMMT597
SOT-23
D501
BAS16
SOT-323
R511
1K0
0W125
0805
R554
100K
0W125
0805
R556
330R
0W125
0805
R525
100R
0W125
0805
D502
BAS16
SOT-323
TR509
FMMT497
SOT-23
TR506
FMMT597
SOT-23
TR510
FMMT497
SOT-23
TR503
FMMT597
SOT-23
R514
1K0
0W125
0805
1
2
CON501
HARWIN
M20-973
R557
330R
0W125
0805
R529
100R
0W125
0805
R530
100R
0W125
0805
D503
BAS16
SOT-323
D506
1N4003
DO-41
D507
1N4003
DO-41
R559
5R6
2W
CF
R536
10K
0W125
0805
R542
4K7
0W125
0805
R526
100R
0W125
0805
DZ500
BZX84C
22V
SOT-23
DZ501
BZX84C
22V
SOT-23
R541
10K
0W125
0805
R538
10K
0W125
0805
TR516
BC849B
SOT-23
TR517
BC849B
SOT-23
TR500
BC859B
SOT-23
TR501
BC859B
SOT-23
SHEET 3
R506
47R
0W125
0805
R507
47R
0W125
0805
R505
47R
0W125
0805
R508
47R
0W125
0805
R516
220R
0W25
MF
R515
220R
0W25
MF
R545
22R
0W25
MF
R546
22R
0W25
MF
R532
22R
0W125
0805
R535
22R
0W125
0805
R552
1K0
1W
CF
R553
1K0
1W
CF
D504
BAS16
SOT-323
D500
BAS16
SOT-323
C508
22UF
63V
YK
C509
22UF
63V
YK
0V_HF_R
0V_HF_R
C503
100P
100V
0805
RV500
220R
LIN
DZ506
BZX84C
3V9
SOT-23
0V_FB_R
0V_FB_R
0V_FB_R
NF
PRE DRIVER BIAS
& TEMP. COMP.
NF
R544
10K
0W125
0805
C500
47P
100V
0805
R513
1K0
0W125
0805
0V_HF_R
R500
22K
0W125
0805
R504
22K
0W125
0805
R501
10K
0W125
0805
C507
10N
100V
0805
C504
10N
100V
0805
R533
22R
0W125
0805
C511
100UF
25V
YK
C506
10N
100V
0805
* - Default jumper setting on pins 2 & 3; fit jumper
~1.6V
NF
C501
47P
100V
0805
C515
100UF
25V
YK
Q503
Q509
D505
1N4003
DO-41
D508
1N4003
DO-41
0V_FB_R
0V_FB_R
ADJUST
TR513
SAP15NY
SAP
TR515
SAP15PY
SAP
Q500
Q511
ITEM500 1 Con Jumper Socket 0.1IN Gold Blue8K004
TR514A
ZDT758
SM-8
TR514B
ZDT758
SM-8
TR512A
ZDT6758
SM-8
TR512B
ZDT6758
SM-8
R549
820R
0W25
MF
R550
820R
0W25
MF
R547
820R
0W25
MF
R548
820R
0W25
MF
R509
1K0
0W125
0805
R512
1K0
0W125
0805
NF
NF
ANNOTATION
REF500
LM431AIM3
SOT-23
DZ502
BZX84C
3V9
SOT-23
DZ503
BZX84C
3V9
SOT-23
R519
470K
0W125
0805
R521
470K
0W125
0805
D509
BAV99
SOT-23
NF
R551 18K
0W25 MF R558 18K
0W25 MF
P501
P502
P504
P505
P507
P508
P509
P510 P511
P513
P514
P515
P520 P527 P529
P530
P531
P532
P533
P538
P539
P540
P542 P544 P546
P549
P551
P552
P554
P556
P558
P559
R523
220R
0W25
MF
R528
220R
0W25
MF
0V_FB_R0V_FB_R
0V_FB_R
0V_FB_R
OUT_R
R517
1K0
0W125
0805
R518
1K0
0W125
0805
R560
330R
0W125
0805
R503 10K
0W125 0805
R540 4K7
0W125 0805
R539
22K
0W125
0805
1 2 3
CON500
HARWIN
M20-973
remove jumper to decrease bias voltage
on pins 1 & 2 to increase bias voltage;
*
NF
NF
03_E116 TGP NO CHANGE TO THIS SHEET 2.117 APR 03
03_E120 TGP 13 May 03 LEDs, BIAS & DOCUMENTATION CHANGE 3.0
R537
5K6
0W125
0805
03_E147 MJT 23 May 03 None to this sheet. PCB change. 4.0
03_E230 MJT 04 Aug 03 None to this sheet. Display snapoff fixing holes reduced to 3.2mm 5.0
A80
03_E264 MJT 09 Sept 03 None to this sheet. Remove EMC can from around IEC inlet. 5.1

ISSUE
DRAWING NO.
DRAWING TITLE
DATE
Filename:
ECO No. DESCRIPTION OF CHANGE
L943C8_5.1.SCH
A80 & P80 Display Circuitry
Contact Engineer:
L943C8
9-Sep-2003
INITIALS
Printed:
88Sheet of
Notes:
Contact Tel: [phone]Mark Tweedale
A & R Cambridge Ltd.
Pembroke Avenue
Cambridge CB5 9QR
Waterbeach
ARCAM
A2
LED805
5mm
GRN
LED 5mm
LED804
5mm
GRN
LED 5mm
LED803
5mm
GRN
LED 5mm
R834
330R
0W125
0805
R835
330R
0W125
0805
R836
330R
0W125
0805
+4.8V(D)_DISP
-25V(FL)_A80
-25V(FL)_A80
-25V(FL)_A80
C817
100N
50V
0805
0V(D)_DISP
0V(D)_DISP
R841
47K
0W125
0805
R840
47K
0W125
0805
R842
47K
0W125
0805
R843
47K
0W125
0805 R844
47K
0W125
0805
R845
47K
0W125
0805 R846
47K
0W125
0805
R847
47K
0W125
0805
R849
47K
0W125
0805
0V(D)_DISP
TO MAIN PCB - SHEET6
1 2
SW812
SDTX-644
+4.8V(D)_DISP
0V(D)_DISP
R832
330R
0W125
0805
R833
330R
0W125
0805
RED GRN
LED800
3mm
BICOL
LED 3mm
+4.8V(D)_DISP
0V(D)_DISP
0V(D)_DISP0V(D)_DISP
SP1_LED SP2_LED
0V(D)_DISP
C811
100N
50V
0805
Q853
Q855 Q856
C818
100N
50V
0805
0V(D)_DISP
Q885
+4.8V(D)_DISP
PROCESSOR_LEDSP2_LEDSP1_LED
R822
0R0
0W125
0805
R823
0R0
0W125
0805
R824
0R0
0W125
0805
1
2
3
X800
4.00MHz
SIL-3
0V(D)_DISP
D801
BAS16
SOT-323
D802
BAS16
SOT-323
D800
BAS16
SOT-323
R803
10K
0W125
0805
R802
10K
0W125
0805
R800
10K
0W125
0805 R801
10K
0W125
0805
+5V
O/P
GND
RX800
PIC-26043TM2
0V(D)_DISP
+4.8V(D)_DISP
TR800
BC849B
SOT-23
TR801
BC849B
SOT-23
Q802 R825
330R
0W125
0805
R804
10K
0W125
0805
R805
10K
0W125
0805
C
3
B2
A1
SW800
EC16B242040A
+4.8V(D)_DISP
0V(D)_DISP
1 2
SW804
1 2
SW805
1 2
SW801
1 2
SW802
1 2
SW806
1 2
SW807
1 2
SW803
1 2
SW808
1 2
SW809
SP1 SP2 AV
1 2
SW810
1 2
SW811
TAPE
ENTER SELECT PHONO CD
TUNER
A80:AUX A80:DVD
P80:SP1 P80:SP2 POWER
COMMON ITEMS
(Fitted on both A80 & P80)
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20 21 22
CON800 MOLEX 52044
+4.8V(D)_DISP
0V(D)_DISP
R815
0R0
0W125
0805
R814
0R0
0W125
0805
P80 ITEMS
(Fitted on P80 only)
A80 ITEMS
(Fitted on A80 only)
R813
0R0
0W125
0805
R812
0R0
0W125
0805
C804
100N
50V
0805
R811
0R0
0W125
0805
0V(D)_DISP
C825
1N0
100V
0805
R826 330R
0W125 0805
C807
100N
50V
0805
C830
10N
100V
0805
C831
10N
100V
0805
R829 330R
0W125 0805
0V(D)_DISP
C814
100N
50V
0805
0V(D)_DISP
Q872
+4.8V(D)_DISP
C815
100N
50V
0805
R821
0R0
0W125
0805
R817
0R0
0W125
0805
Q861
Q859
Q860
Q858
C803
100N
50V
0805
Q862 Q863 Q864
Q875
Q874 Q881
Q822 Q821 Q823 Q824 Q825 Q826 Q827 Q828 Q829 Q831 Q832 Q833 Q834 Q835 Q836 Q837 Q838 Q839 Q840 Q841 Q842 Q843 Q844 Q845 Q846 Q847
R810
0R0
0W125
0805
-25V(FL)_A80
POWER LEDs
C810
100N
50V
0805
C809
100N
50V
0805
*RESET_DISP
PHASE_A / *SP2_LED DISP
VFD_SDATA / *SP1_LED DISP
*PWR_LED_RED_DISP
VFD_SDO / *SP1_SW DISP
*PWR_LED_GRN_DISP
PHASE_B / *SP2_SW DISP *RESET_DISP +4.8V(D) / 0V(D) *PWR_LED_GRN_DISP *PWR_LED_RED_DISP
R831 330R
0W125 0805
VFD_CS / 0V(D)
VFD_CS / 0V(D)
VFD_SCLK / *PWR_BTN DISP
VFD_SCLK / *PWR_BTN DISP
VFD_SCLK / *PWR_BTN DISP
R819
0R0
0W125
0805
VFD_SDATA / *SP1_LED DISP
VFD_SDATA / *SP1_LED DISP
FIL2 / 0V(D) FIL1 / 0V(D)
FIL2 / 0V(D)
FIL1 / 0V(D)
VFD_SDO / *SP1_SW DISP
PHASE_A / *SP2_LED DISP
R820
0R0
0W125
0805
R818
0R0
0W125
0805
VFD_SDO / *SP1_SW DISP
PHASE_B / *SP2_SW DISP
PHASE_B / *SP2_SW DISP
PHASE_A / *SP2_LED DISP
R830 330R
0W125 0805
R828 330R
0W125 0805
R827 330R
0W125 0805
POWER-ON RESET
Q803 Q804 Q805 Q806 Q807 Q808 Q809 Q810 Q811 Q812 Q813 Q814 Q815 Q816 Q817 Q818 Q819
F
1
Pm
4
Pn
5
Pj
6
Pe
7
Pg
8
Pf
9
Pl
10
PAp
11
G10
12
G9
13
G8
14
G7
15
G6
16
G5
17
G4
18
G3
19
G2
20
G1
21
Pa
22
Pi
23
Pk
24
Pb
25
Ph
26
Pc
27
PCOM
28
Pd
29
PDp
30
F
32
DISP800 ITRON AH1016A
P21/D13/S14
1
P20/D12/S15
2
P03/D11
3
P02/D10
4
P01/D9
5
P00/D8
6
D7
7
D6
8
D5
9
D4
10
NC
11
D3
12
D2
13
D1
14
D0
15
VPP
16
NC
17
VDD
18
OSC1
19
OSC2
20
VSS
21
NCS
22
SCK 23
SDI 24
SDO 25
P30/K0 26
P31/K1 27
P32/K2 28
P33/K3 29
P34/K4 30
S0 31
S1 32
S2 33
S3 34 S4 35 S5 36 S6 37 S7 38
P10/S8 39 P11/S9 40
P12/S10 41 P13/S11 42
P23/D15/S12 43 P22/D14/S13 44
IC800
PT6351
LQFP-44
MASTER
R816
0R0
0W125
0805
C808
100N
50V
0805
TR802
MMUN2111LT1
SOT-23
TR803
MMUN2111LT1
SOT-23
TR804
MMUN2111LT1
SOT-23
TR805
MMUN2111LT1
SOT-23
NOTE:
All resistor / small capacitor
combinations are placed near
flexfoil connector for EMC filtering
R807 0R0
0W125 0805
R808 0R0
0W125 0805
0V(D)_DISP0V(D)_DISP
VFD LOCATORS
C819
100N
50V
0805
0V(D)_DISP
Q886 C820
100N
50V
0805
0V(D)_DISP
Q887 C821
100N
50V
0805
0V(D)_DISP
Q888 C822
100N
50V
0805
0V(D)_DISP
Q889 C823
100N
50V
0805
0V(D)_DISP
Q890
C824
100N
50V
0805
0V(D)_DISP
Q891
C806
100N
50V
0805
0V(D)_DISP
Q820
R848
47K
0W125
0805
0V(D)_DISP 0V(D)_DISP
C816
100N
50V
0805
C829
1N0
100V
0805
C828
1N0
100V
0805
C827
1N0
100V
0805
C826
1N0
100V
0805
LED801
3mm
GRN
LED 3mm
LED802
3mm
GRN
LED 3mm
ANNOTATION
R837
220R
0W25
MF
R838
220R
0W25
MF
R839
220R
0W25
MF
CHAS_DISP
CHAS_DISPCHAS_DISP
CHAS_DISP
CHAS_DISP
CHAS_DISP
CHAS_DISP CHAS_DISP
CHAS_DISP
CHAS_DISP
C834
100N
50V
0805
0V(D)_DISP
Q892
CHAS_DISP
VCC
RST
GND
IC801
LM809M3-3.08
SOT-23
R806
1K0
0W125
0805
C802
100N
50V
0805
0V(D)_DISP
R850
0R0
0W125
0805
(used to
display side)
tie down
track at
REMOTE_DISP
DZ800
BZX84C
22V
SOT-23
DZ801
BZX84C
5V6
SOT-23
R853
100R
0W125
0805
R854
100R
0W125
0805
CATHODE BIAS
Q873
Q876
Q877
R852
10K
0W125
0805
R851
10K
0W125
0805
CHAS_DISP
0V(D)_DISP
TR806 FMMT597
SOT-23
-38V_VFD
R809
0R0
0W125
0805
+4.8V(D)_DISP
C805
100N
50V
0805
0V(D)_DISP
+4.8V(D) / 0V(D)
R855
1K0
0W125
0805
LED806
SM
RED
SML-010
R856 330R
0W125 0805
MOUNTED
UNDER IR EYE
C837
47P
100V
0805
C838
47P
100V
0805
CHAS_DISP
P800
P805
P804
P803
P802
P801
C836
10UF
50V
SM
C835
10UF
50V
SM
C801
10UF
50V
SM
C800
10UF
50V
SM
C813
10UF
50V
SM
C812
10UF
50V
SM
C832
100UF
6.3V
SM
C833
100UF
6.3V
SM
03_E116 TGP NO CHANGE TO THIS SHEET 2.117 APR 03
03_E120 TGP 13 May 03 LEDs, BIAS & DOCUMENTATION CHANGE 3.0
03_E147 MJT 23 May 03 None to this sheet. PCB change. 4.0
1
FIX801
Dia 3.2mm
1
FIX802
Dia 3.2mm
1
FIX803
Dia 3.2mm
1
FIX804
Dia 3.2mm
1
FIX805
Dia 3.2mm
1
FIX806
Dia 3.2mm
1
FIX800
Dia 3.2mm
1
FIX808
Dia 3.2mm
1
FIX807
Dia 3.2mm
03_E230 MJT 04 Aug 03 Display snapoff fixing holes reduced to 3.2mm 5.0
A80
03_E264 MJT 09 Sept 03 None to this sheet. Remove EMC can from around IEC inlet. 5.1

ISSUE
DRAWING NO.
DRAWING TITLE
DATE
Filename:
ECO No. DESCRIPTION OF CHANGE
L943C7_5.1.SCH
A80/P80 Trig, RC5 & P80 Sig Det
Contact Engineer:
L943C7
9-Sep-2003
INITIALS
Printed:
78Sheet of
Notes:
Contact Tel: [phone]Mark Tweedale
A & R Cambridge Ltd.
Pembroke Avenue
Cambridge CB5 9PB
Waterbeach
23425
P80 SIG DETECT
PRE_OUT_L
PRE_OUT_R
0V(D)
Q0 9
Q1 7
Q2 6
Q3 5
Q4 3
Q5 2
Q6 4
Q7 13
MR
11 CP
10 Q8 12
Q9 14
Q10 15
Q11 1
IC701A
74HCT4040D
SO-16
0V(D)
INVERTER
12
13 14
IC700D
LM324D
SO-145
67
IC700B
LM324D
SO-14
3
21
411
IC700A
LM324D
SO-14
10
98
IC700C
LM324D
SO-14
+4.8V(D)_2
+4.8V(D)_2
0V(D)
0V(D)
0V(D)
+4.8V(D)
C718
100UF
25V
YK
R701
100K
0W125
0805
R700
100K
0W125
0805
+1.6V(D)
C716
100UF
25V
YK
R704
100K
0W125
0805
+1.6V(D)
(NF ON A80)
C704
100N
50V
0805
0V(D)
R709
33K
0W125
0805
R710
33K
0W125
0805
C702
100N
50V
0805
C703
100N
50V
0805
+1.6V(D)
+1.6V(D)
1
2
3
CON702
HARWIN
M20-973
AUTO-OFF
DELAY SET
Pins 1&2: ~12 mins (default)
Pins 2&3: ~45 mins
SET SENSITIVITY
LATCH & COUNTER RESET
R722
680R
0W125
0805
R703
100K
0W125
0805
R702
100K
0W125
0805
Jumper Fitted = ~0.5mVrms (default);
0V_PREOUT
Q727
Q718
Q719
Q714
P80 TRIGGER IN
TRIGGER OUT
TR701
BC849B
SOT-23
R727
10K
0W125
0805
TR700
BD179
TO-126
C720
10UF
50V
YK
+45V_L
C701
100N
50V
0805
0V_CHASS
L700
70R@100MHz
R715
100R
0W125
0805
DZ700
BZX84C
15V
SOT-23
GND1
NC1
GND2
NC2
SKT700
HOSIDEN HSJ
Vout=0.82Vin
R728
10K
0W125
0805
C710
100P
100V
0805
C700
100N
50V
0805
~13.5V @ 30mA max
R738
2K2
0W125
0805
0V(D)
C717
100UF
25V
YK
R705
100K
0W125
0805
D702
BAV99 SOT-23
D703
BAV99 SOT-23
SET SENSITIVITY
R723
680R
0W125
0805
P80 DELAYED OFF
0.38Hz_CLK
0V(D)
+4.8V(D)
+45V_L
+4.8V(D)
0V(D)
+45V_L
0V_CHASS
0V_CHASS
REMOTE_P
TRIG_IN
C709
100N
50V
0805
VCC 16
GND 8
IC701B
74HCT4040D
SO-16
C708
100N
50V
0805
0V(D)
0V(D)
0V(D)
+4.8V(D)_2
Q713
(NF ON A80)
Jumper Not Fitted = ~2mVrms Q724
Q715
Q709
Power-On Reset
*RESET
C711
100P
100V
0805
C712
100P
100V
0805
R735
47R
0W125
0805
ITEM700 3 Con Jumper Socket 0.1IN Gold Blue8K004
R725
22K
0W125
0805
R724
22K
0W125
0805
C721
220UF
16V
YK
C715
100UF
25V
YK +4.8V(D)_2
R718
1K0
0W125
0805
R719
1K0
0W125
0805
R720
1K0
0W125
0805
R736
3K3
0W125
0805
R737
2K2
0W125
0805
LATCH
+4.8V(D)_2
CLK
3
D
2
SD 4
RD
1
Q5
Q6
IC703A
74HCT74D
SO-14
CLK
11
D
12
SD 10
RD
13
Q9
Q8
IC703B
74HCT74D
SO-14
VCC 14
GND 7
IC703C
74HCT74D
SO-14
TR702
MMUN2111LT1
SOT-23
+4.8V(D)_2
R733
3K3
0W125
0805
0V(D)
ANNOTATION
NF ON A80
D700
BAV99 SOT-23
D701
BAV99 SOT-23
R726
22R
0W125
0805
0.38Hz_CLK
P708 P707
P701
P704
P702
P710
P712
P705 P713
P711
P714
P724
0V(D)
R706
0R0
0W125
0805
C705
100N
50V
0805
NF ON P80
REMOTE_N
<-------- Vin D704
BAT54SSOT-23
+4.8V(D)
1 2
R707
4K7
0W125
0805
(NF ON A80)
TO SHEET 6
C706
100N
50V
0805
R708
100K
0W125
0805
DZ701
BZX84C
4V7
SOT-23
1
2
CON701
HARWIN
M20-973
1
2
CON700
HARWIN
M20-973
R713
100K
0W125
0805
R711
22K
0W125
0805
R712
22K
0W125
0805
R716
330R
0W125
0805
R717
330R
0W125
0805
Jumper Fitted = ~0.5mVrms (default);
Jumper Not Fitted = ~2mVrms
R714
0R0
0W125
0805 R721
0R0
0W125
0805
0V(D)
NF
P706
P700
P703
P709
P715P716
03_E116 TGP NO CHANGE TO THIS SHEET 2.117 APR 03
03_E120 TGP 13 May 03 LEDs, BIAS & DOCUMENTATION CHANGE 3.0
03_E147 MJT 23 May 03 None to this sheet. PCB change. 4.0
03_E230 MJT 04 Aug 03 None to this sheet. Display snapoff fixing holes reduced to 3.2mm 5.0
A80
03_E264 MJT 09 Sept 03 None to this sheet. Remove EMC can from around IEC inlet. 5.1

ISSUE
DRAWING NO.
DRAWING TITLE
DATE
Filename:
ECO No. DESCRIPTION OF CHANGE
L943C6_5.1.SCH
A80/P80 Protection & Micros
Contact Engineer:
L943C6
9-Sep-2003
INITIALS
Printed:
68Sheet of
Notes:
Contact Tel: [phone]Mark Tweedale
A & R Cambridge Ltd.
Pembroke Avenue
Cambridge CB5 9PB
Waterbeach
23425
TO DISPLAY - SHEET 8
0V(D)
+4.8V(D)
-38V_VFD
LISTEN_2
LISTEN_1
LISTEN_0
VOL_SDATA
VOL_SCLK
TAPE_0
TO SHEET 3
3 4
IC601B
74HC14
SO-14
5 6
IC601C
74HC14
SO-14
OVERCURRENT DETECTION
0V(D)
VIPROT_R
VIPROT_L
+45V_R
-45V_L
VI_LIM
+4.8V(D)
-45V_L
-38V_VFD
+45V_R
+45V_L
+45V_L
DC OFFSET DETECTION
R634
100K
0W125
0805
R635
100K
0W125
0805
R636
100K
0W125
0805
TR608
FMMT497
SOT-23
TR605
FMMT597
SOT-23
TR604
FMMT597
SOT-23
0V(D)
DC_OFFSET
-45V_L
+45V_R
PREAMP CONTROL LINES
OUTPUT_L
OUTPUT_R
0V(D)
+4.8V(D)
R617 10K
0W125 0805
R618 10K
0W125 0805
R616 10K
0W125 0805
R615 1K0
0W125 0805
R614 1K0
0W125 0805
R613 10K
0W125 0805
0V_SER
C613
10N
100V
0805
C612
10N
100V
0805
C623
10UF
63V
NONP
C624
10UF
63V
NONP
DZ602
BZX84C
4V7
SOT-23
0V(SIG)
0V(SIG)
VOL_SCLK_u
VOL_SDATA_u
LISTEN_0_u
LISTEN_1_u
LISTEN_2_u
TAPE_2_u
R602
0R0
0W125
0805
NF ON A80
0V(D)
R650
22K
0W125
0805
ITEM600 1 Con Jumper Socket 0.1IN Gold Blue8K004
Q612
Q613
Q632
TAPE_1
TAPE_2
R612 10K
0W125 0805
R611 10K
0W125 0805 TAPE_0_u
TAPE_1_u
89 IC601D
74HC14
SO-14
1011 IC601E
74HC14
SO-14
THERMAL CUTOUT
TR602
FMMT597
SOT-23
0V(D)
C603
100N
50V
0805
TR603
FMMT597
SOT-23
0V(D)
C604
100N
50V
0805
RTH600
PTC 110DEG
PTC
RTH601
PTC 110DEG
PTC THERM
+45V_R
+45V_L
R621
2K2
0W125
0805
R620
2K2
0W125
0805 DZ603
BZX84C
4V7
SOT-23
DZ604
BZX84C
4V7
SOT-23
R638
680R
0W125
0805
R639
680R
0W125
0805
DZ601
BZX84C
3V9
SOT-23
DZ600
BZX84C
3V9
SOT-23
Q633
Q634
8
9
10
IC600C
74HC00D
SO-14
1
23
IC600A
74HC00D
SO-14
11
12
13
IC600D
74HC00D
SO-14
4
56
IC600B
74HC00D
SO-14
0V(D)
1213
IC601F
74HC14
SO-14
0V(D)
0.38Hz OSCILLATOR
NF ON P80
R623
10K
0W125
0805
(FOR P80 AUTO-OFF)
0.38Hz_CLK
A80:REMOTE A80:PHASE_A A80:FIL1 A80:VFD_SDO A80:+4.8V(D) A80:*RESET A80:PHASE_B A80:FIL2 A80:VFD_SDATA A80:VFD_SCLK A80:VFD_CS A80:*PWR_LED_RED A80:*PWR_LED_GRN
REMOTE_P
P80:*RESET P80:0V(D) P80:*PWR_LED_GRN P80:*PWR_LED_RED
P80:0V(D) P80:*PWR_BTN P80:*SP1_LED P80:*SP1_SW P80:0V(D) P80:0V(D) P80:*SP2_SW P80:*SP2_LED P80:0V(D)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
CON600 MOLEX 52045
0V(D)
*PWR_LED_RED
VFD_CS
VFD_SDO / *SP1_SW
9VRMS 1 2
IC601A
74HC14
SO-14
AC PRESENT DETECT
D600
BAS16
SOT-323
TR600
BC849B
SOT-23
R619
10K
0W125
0805
0V(D)
+4.8V(D)
AC_PRESENT
FIL_1
FIL_2 NF ON P80
NF ON P80
R604 0R0
0W125 0805
R601 0R0
0W125 0805
*PWR_LED_GRN
Q638
Q614
Q616
Q631
Q603
Q604
Q605
Q606
Q607
Q608
Q609
Q610
Q611
+4.8V(D)
0V(D)
0V(D)
C611
100N
50V
0805
PWR_ON
AC_PRESENT
TRIG_IN
DC_OFFSET
VI_LIM
THERM
SPKR2_ON
SPKR1_ON
SPKR2_ON
PWR_ON
SPKR1_ON
VOL_SCLK_u VOL_SDATA_u
DC_OFFSET
AC_PRESENT
RS232_RX
RS232_TX
VI_LIM
THERM
A0 1
A1 2
A2 3 SDA
5
SCL
6
WP
7
IC604A
24C02
SO-8
GND
4
VCC
8IC604B
24C02
SO-8
+4.8V(D)
C609
100N
50V
0805
EEPROM_SDATA
EEPROM_SCLK
C608
100N
50V
0805
0V(D)
+4.8V(D)
0V(D)
+4.8V(D)
+4.8V(D)
0V(D)
LISTEN_0_u LISTEN_1_u LISTEN_2_u TAPE_2_u *PRE_MUTE_u TAPE_0_u TAPE_1_u
R637
100K
0W125
0805
1 2
CON601
HARWIN
M20-973
1 2
CON602
HARWIN
M20-973
C610
100N
50V
0805
TRIG_IN
VFD_SDATA / *SP1_LED
PHASE_A / *SP2_LED
REMOTE
PHASE_A / *SP2_LED
PHASE_B / *SP2_SW
VFD_SCLK / *PWR_BTN
VFD_SDATA / *SP1_LED
VFD_CS
VFD_SDO / *SP1_SW
*RESET
*PWR_LED_GRN
*PWR_LED_RED
*NMI
PHASE_B / *SP2_SW
VFD_SDO / *SP1_SW
VFD_SCLK / *PWR_BTN
SPKR2_ON SPKR1_ON
REMOTE
*RESET
*RESET
(To Sheet 7)
(From Sheet 7)
(From Sheet 7)
(To Sheet 7)
REMOTE
PHASE_A / *SP2_LED
PHASE_B / *SP2_SW
*RESET
*PWR_LED_RED
*PWR_LED_GRN
*PWR_LED_GRN
*PWR_LED_RED
VFD_SCLK / *PWR_BTN
VFD_SDATA / *SP1_LED
(To Top Sheet)
A80 MICRO
P80 MICRO
*NMI
R653 330R
0W125 0805
C625 1N0
100V 0805
C606
100N
50V
0805
R622 10K
0W125 0805
0V(D)
R608
0R0
0W125
0805
NF ON A80
0V(D)
-38V_VFD
R605
0R0
0W125
0805
NF ON A80
0V(D)
R603
0R0
0W125
0805
NF ON A80
0V(D)
R661 330R
0W125 0805
R660 330R
0W125 0805
Fit jumper for
normal operation
Fit jumper to
re-program
R606
0R0
0W125
0805
NF ON A80
R654 330R
0W125 0805
C617
10N
100V
0805
R655 330R
0W125 0805
C616
10N
100V
0805
R656 330R
0W125 0805
R657 330R
0W125 0805 R658 330R
0W125 0805
R659 330R
0W125 0805
NF ON P80
(NF ON A80)
(NF on P80)
NF ON A80
NF ON A80
R642
2K2
0W125
0805
0V(D)
NF ON P80
NF ON P80
R607
0R0
0W125
0805
NF ON A80
0V(D)
R633
3K3
0W125
0805
R643
2K2
0W125
0805
R632
3K3
0W125
0805
R644
2K2
0W125
0805
R648
4K7
0W125
0805
R647
4K7
0W125
0805
R646
4K7
0W125
0805
R645
4K7
0W125
0805
FIL_1
FIL_2
0V(D)
C630
100P
100V
0805
C631
100P
100V
0805
C605
100N
50V
0805
C600
100N
50V
0805
0V(D)
NF ON P80
C618
10N
100V
0805
NF ON P80
+4.8V(D)
0V(D)
C601
100N
50V
0805
VCC 14
GND 7
IC600E
74HC00D
SO-14
*PRE_MUTE
0V_D_PRE
*PRE_MUTE_u
Q600
R626 10R
0W125 0805
R630
3K3
0W125
0805
C622
10UF
50V
YK
C607
100N
50V
0805
0V(D)
Q639
1
2
3
X600
4.00MHz
SIL-3
0V(D)0V(D)
C614
10N
100V
0805
C615
10N
100V
0805
NF
NF
R624
10K
0W125
0805
R609
0R0
0W125
0805
R610
0R0
0W125
0805
0V(D)0V(D)
R652
33K
0W125
0805
C621
100UF
25V
YK
1
FIX600
Dia 3.5mm
C629
1N0
100V
0805
C628
1N0
100V
0805
C626
1N0
100V
0805
C627
1N0
100V
0805
NF ON P80
0V(D)
+4.8V_D_PRE +4.8V_D_PRE
SP602
+4.8V_D_PRE
Q601
GND 7
VCC 14
IC601G
74HC14
SO-14
C602
100N
50V
0805
+4.8V(D)
0V(D)
C619
100UF
25V
YK
C620
100UF
25V
YK
R629
47R
0W125
0805
ANNOTATION
Q629
Q619 Q620 Q621 Q622 Q623 Q624 Q625 Q626 Q627
Q630
Q628
Q618
Q635
Q636
Q637
R640
33K
0W125
0805
R641
33K
0W125
0805
NC
49
NC
50
P14/IRQ0
51
P15/IRQ1
52
P16/IRQ2
53
P17/IRO3/TRGV
54
PB4/AN4
55
PB5/AN5
56
PB6/AN6
57
PB7/AN7
58
PB3/AN3
59
PB2/AN2
60
PB1/AN1
61
PB0/AN0
62
NC
63
NC
64
NC
33
NC
34
NMI
35
P80/FTCI
36
P81/FTIOA
37
P82/FTIOB
38
P83/FTIOC
39
P84/FTIOD
40
P85
41
P86
42
P87
43
P20/SCK3
44
P21/RXD
45
P22/TXD
46
NC
47
NC
48
P56/SDA 26
P57/SCL 27
P74/TMRIV 28 P75/TMCIV 29
P76/TMOV 30
TEST 8
NC 17 NC 31 NC 18 NC 32
P52/WKP2 19 P53/WKP3 20 P54/WKP4 21
P55/WKP5/ADTRG 22
Vss 9
P10/TMOW 23
P11 24
OSC2 10
NC 1
NC 2
AVcc 3
X2 4
X1 5
Vcl 6
RES 7
OSC1 11
Vcc 12
P50/WKP0 13
P51/WKP1 14
NC 15
NC 16
P12 25
IC602
HD64F3664FP
L943SW
LQFP-64
D601
BAV99
SOT-23
D603
BAV99
SOT-23
D602
BAV99
SOT-23
Q640
Q641
0.38Hz_CLK
P625
P627
P626
P623
P624 P645
P647
P646
P601
P602
P603
P604
P605
P606
P607
P608
P609
P613
P610 P614
P611
P612 P616
P615
P617
P618
P619
P628
P620
P621
P622 P629
P634
P635
P636
P637
P638
P639
P640
P641
P643
R662
100K
0W125
0805
0V(D)
(RESISTORS NF ON P80)
D608
BAT54S
SOT-23
+4.8V(D)
R628
4K7
0W125
0805
R627
4K7
0W125
0805
Fit on CON601 after programming; NF ON P80
0V(D)
Connect near
IC602
R625
4K7
0W125
0805
R665
4K7
0W125
0805
R631
10K
0W125
0805
0V(D)
0V(D)
R651
22K
0W125
0805
R649
3K3
0W125
0805
R663
0R0
0W125
0805
VOL_*CS_u
VOL_*CS_u
R600 1K0
0W125 0805 Q642
VOL_*CS
Q645 Q643 Q644
REMOTE_N
C632
47P
100V
0805
C633
47P
100V
0805
P600
P630
P632
P631
Q602
P633
NF ON A80
03_E116 TGP NO CHANGE TO THIS SHEET 2.117 APR 03
03_E120 TGP 13 May 03 LEDs, BIAS & DOCUMENTATION CHANGE 3.0
03_E147 MJT 23 May 03 None to this sheet. PCB change. 4.0
03_E230 MJT 04 Aug 03 5.0
A80
PB5
1
PB4
2
PA3
3
PA2
4
PA1
5
PA0
6
PB3
7
PB2
8
PB1
9
PB0
10
VSS
11
(TMR)/INT
12
PC0
13
PC1
14 PC2 15
PC3 16
PC4 17
PC5 18
RES 19
VDD 20
OSC1 21
OSC2 22
PA7 23
PA6 24
PA5 25
PA4 26
PB7 27
PB6 28
IC603 HT48R30A-1
L028SW DIP-28
IC603-1 1 IC Skt 28PIN 0.3IN8S028N Socket for IC603; NF onA80
Changed P80 s/w & fitted IC socket for IC603 (P80 only).
Display snapoff fixing holes reduced to 3.2mm
03_E264 MJT 09 Sept 03 None to this sheet. Remove EMC can from around IEC inlet. 5.1

ISSUE
DRAWING NO.
DRAWING TITLE
DATE
Filename:
ECO No. DESCRIPTION OF CHANGE
L943C3_5.1.SCH
A80 PreAmp
Contact Engineer:
L943C3
9-Sep-2003
INITIALS
Printed:
38Sheet of
Notes:
Contact Tel: [phone]Mark Tweedale
A & R Cambridge Ltd.
Pembroke Avenue
Cambridge CB5 9PB
Waterbeach
23425
0V(SIG)
0V(SIG)
0V(SIG)
0V(SIG)
+15V(A)
-15V(A)
+15V(A)
-15V(A)
0V(SIG)
0V(SIG)
0V(SIG)
+15V(A)
-15V(A)
0V(SIG)
+15V(A)
-15V(A)
-15V(A)
-15V(A)
LINE OUTPUT
AUX2 L
CD L
TUNER L
AV L
DVD L
TAPE IN L
AUX L
PHONO L
AUX2 R
CD R
TUNER R
AV R
DVD R
TAPE IN R
AUX R
PHONO R
LISTEN_0_PRE
LISTEN_1_PRE
LISTEN_2_PRE
LISTEN_0_PRE
LISTEN_1_PRE
LISTEN_2_PRE
+15V(A)
+15V(A)
0V(SIG)
0V(SIG)
0V(SIG)
*PRE_MUTE_PRE
+15V(A)
-15V(A)
D311
BAV99
SOT-23
D312
BAV99
SOT-23
D318
BAV99 SOT-23
D319
BAV99 SOT-23
X0
4
X1
5
X2
6
X3
7
X4
12
X5
11
X6
10
X7
9
EN
2
A0
1
A1
16
A2
15
V-
3
D8
GND
14
V+ 13
IC303
DG408DY
SO-16
C331
470P
100V
FKP2
C332
470P
100V
FKP2
C333
470P
100V
FKP2
C330
470P
100V
FKP2
+15V(A)
X0
4
X1
5
X2
6
X3
7
X4
12
X5
11
X6
10
X7
9
EN
2
A0
1
A1
16
A2
15
V-
3
D8
GND
14
V+ 13
IC302
DG408DY
SO-16
R308
1K0
0W125
0805
R314
1K0
0W125
0805
R315
1K0
0W125
0805
R312
1K0
0W125
0805
R329
100K
0W125
0805
R326
100K
0W125
0805
R327
100K
0W125
0805
R328
100K
0W125
0805
-15V(A)
+15V(A)
C338
1N0
100V
0805
6
57
IC305B
TL072CD
SO-8
2
31
84
IC305A
TL072CD
SO-8
-15V(A)
0V(SIG)
C344
100N
50V
0805
C345
100N
50V
0805
C348
100N
50V
0805
C384
10UF
50V
YK
C349
100N
50V
0805
C390
100UF
25V
YK
C385
10UF
50V
YK
R336
47R
0W125
0805
R337
47R
0W125
0805
0V(SIG_2)
C352
100N
50V
0805
RLY300A
NEC
EB2-5NU
RLY300B
NEC
EB2-5NU
RLY300C
NEC
EB2-5NU
C353
100P
100V
FKP2
C359
4N7
100V
FKP2
C357
22UF
50V
CFNE
0V(SIG)
C373
10UF
50V
YK
R345
820R
0W125
0805
R346
820R
0W125
0805
R349
680K
0W125
0805
R339
47K
0W125
0805
+15V(A)
-15V(A) 0V(SIG)
C354
100P
100V
FKP2
C358
22UF
50V
CFNE
0V(SIG)
R348
820R
0W125
0805
R350
680K
0W125
0805
R340
47K
0W125
0805
D316
BAV99
SOT-23
-15V(A)
+15V(A)
D317
BAV99
SOT-23
-15V(A)
+15V(A)
0V(SIG)
0V(SIG)
0V(SIG)
0V(SIG)
+15V(A)
-15V(A)
+15V(A)
-15V(A)
0V(SIG)
0V(SIG)
D314
BAV99 SOT-23
D315
BAV99 SOT-23
SCRN
REAR PANEL VIEW
SKT303
KUNMING
GOLD
C325
470P
100V
FKP2
C328
470P
100V
FKP2
C329
470P
100V
FKP2
C327
470P
100V
FKP2
R304
1K0
0W125
0805
R310
1K0
0W125
0805
R311
1K0
0W125
0805
R309
1K0
0W125
0805
R325
100K
0W125
0805
R323
100K
0W125
0805
R321
100K
0W125
0805
R324
100K
0W125
0805
C337
1N0
100V
0805
D313
BAV99
SOT-23
-15V(A)
+15V(A)
D308
BAV99
SOT-23
-15V(A)
+15V(A)
0V(SIG)
0V(SIG)
0V(SIG)
0V(SIG)
+15V(A)
-15V(A)
+15V(A)
-15V(A)
0V(SIG)
0V(SIG)
D309
BAV99 SOT-23
D310
BAV99 SOT-23
SCRN
REAR PANEL VIEW
SKT302
KUNMING
GOLD
C321
470P
100V
FKP2
C323
470P
100V
FKP2
C326
470P
100V
FKP2
C324
470P
100V
FKP2
R300
1K0
0W125
0805
R301
1K0
0W125
0805
R306
1K0
0W125
0805
R305
1K0
0W125
0805
R322
100K
0W125
0805
R320
100K
0W125
0805
R316
100K
0W125
0805
R319
100K
0W125
0805
C336
1N0
100V
0805
D307
BAV99
SOT-23
-15V(A)
+15V(A)
D301
BAV99
SOT-23
-15V(A)
+15V(A) +15V(A)
-15V(A)
0V(SIG)
SCRN
REAR PANEL VIEW
SKT301
KUNMING
GOLD
0V(SIG)
C335
1N0
100V
0805 +15V(A)
-15V(A)
INPUT BUS
0V(SIG)
SCRN
REAR PANEL VIEW
SKT300
KUNMING
GOLD
C320
470P
100V
FKP2
C322
470P
100V
FKP2
TUNER INPUT
CD INPUT
R302
1K0
0W125
0805
DVD INPUT
R303
1K0
0W125
0805
AV INPUT
R317
100K
0W125
0805
AUX INPUT
R318
100K
0W125
0805
PHONO/
C334
1N0
100V
0805
PHONO L
CD L
TUNER L
AV L
DVD L
AUX L
PHO R
D300
BAV99
SOT-23
CD R
-15V(A)
TUNER R
+15V(A)
AV R
DVD R
AUX R
1 2 3
CON306
HARWIN
M20-973
1 2 3
CON307
HARWIN
M20-973
ITEM300 6 Con Jumper Socket 0.1IN Gold Blue8K004
AUX2 L
AUX2 R
C342 100N
50V 0805
C343
100N
50V
0805 0V(SIG)
-15V(A)
+15V(A)
TAPE INPUT
-15V(A)
+15V(A)
-15V(A)
+15V(A)
C308
10N
100V
0805
C306
10N
100V
0805
C317
10N
100V
0805
TAPE OUTPUT
C314
10N
100V
0805
C312
10N
100V
0805
C313
10N
100V
0805
PLACE JUMPERS ON PINS 1 & 2
TO ENABLE PHONO (DEFAULT),
PINS 2 & 3 FOR AUX2
PHO R
PHO L
TAPE IN L TAPE IN R
PHO L
PHONO R
C350
100N
50V
0805
C351
100N
50V
0805
6
57
IC307B
NJM2114M
DMP-8
6
57
IC308B
NJM2114M
DMP-8
A80 PreAmp Out /A80 Line Out /
C361
1N0
100V
FKP2 C363
330P
100V
FKP2
C374
10UF
50V
YK
R347
820R
0W125
0805
0V(SIG)
1 2
CON300
HARWIN
M20-973
1 2
CON301
HARWIN
M20-973
FIT JUMPERS
C380
22P
100V
0805
C378
22P
100V
0805
VOL_SCLK_PRE
VOL_SDATA_PRE
FIT JUMPERS TO ENGAGE
PREAMP FOR A80 BUILD
PHONO PREAMP
VOLUME CONTROL
0V(SIG)
+15V(A)
-15V(A)
D302
BAV99 SOT-23
R372
22K
0W125
0805
R362
22K
0W125
0805
C387
100UF
25V
CFNE
C389
100UF
25V
CFNE
0V(SIG)
0V(SIG)
-15V(A)
+15V(A)
C300
10N
100V
0805
C301
10N
100V
0805
0V(SIG)
1 2
CON303
HARWIN
M20-973
1 2
CON302
HARWIN
M20-973
PRE_OUT_L
PRE_OUT_R
*PRE_MUTE_PRE
SCRN
REAR PANEL VIEW
SKT304
KUNMING
GOLD
D305
BAV99
SOT-23
D306
BAV99
SOT-23
0V(SIG)
-15V(A)
0V(SIG)
+15V(A)
-15V(A)
TAPE OUTPUT
D303
BAV99
SOT-23
D304
BAV99
SOT-23
TOP_L
TOP_R
6
57
IC304B
TL072CD
SO-8
2
31
84
IC304A
TL072CD
SO-8
-15V(A)
C340
100N
50V
0805
C341
100N
50V
0805
+15V(A)
0V(SIG)
+15V(A)
+15V(A)
-15V(A)
0V(SIG)
P80 PowerAmp InP80 Pre Out Loop
TAPE OUTPUT SELECT
TOP_L
TOP_R
*PRE_MUTE
R381
10K
0W125
0805
R382
10K
0W125
0805
C377
22P
100V
0805
C376
22P
100V
0805
C379
22P
100V
0805
C381
22P
100V
0805
R335 47R
0W125 0805
R333 47R
0W125 0805
R332 47R
0W125 0805
R334 47R
0W125 0805
1 2 3
CON304
HARWIN
M20-973
1 2 3
CON305
HARWIN
M20-973
FIT JUMPERS ON
PINS 1 & 2 (2 & 3
2
31
84
IC306A
NJM2114M
DMP-8
6
57
IC306B
NJM2114M
DMP-8
+5V(A)
+5V(A)
+5V(A)
+5V(A)
0V(SIG) 0V(SIG) 0V(SIG_2)
0V(SIG)
+15V(A)
-15V(A)
C346
100N
50V
0805
C347
100N
50V
0805
2
31
84
IC307A
NJM2114M
DMP-8
2
31
84
IC308A
NJM2114M
DMP-8
0V(SIG_2)
-15V(A)
C367
220UF
16V
YK
0V(SIG)
C388
100UF
25V
CFNE
C386
100UF
25V
CFNE
R383
10K
0W125
0805
R384
10K
0W125
0805
0V(SIG)
0V_D_PRE
0V(SIG)
0V_SER_PRE
FOR PRE/PWR)
(NF FOR P80 OR PRE/PWR)
D320
BAS16
SOT-323
0V(SIG)
0V(SIG)
R341
47K
0W125
0805
R342
100K
0W125
0805
0V(SIG)
-15V(A)
C370
220UF
16V
YK
R343
47K
0W125
0805
R344
100K
0W125
0805
0V(SIG)
-15V(A)
C372
220UF
16V
YK
-15V(A)
C369
220UF
16V
YK
0V(SIG_2)
0V(SIG)
0V(SIG)
R363 22K
0W125 0805 R367 22K
0W125 0805
R364 22K
0W125 0805 R368 22K
0W125 0805
R365 22K
0W125 0805 R369 22K
0W125 0805
R366 22K
0W125 0805 R370 22K
0W125 0805
0V(SIG)
0V_PREOUT
R307
1K0
0W125
0805
R351
22K
0W125
0805
R373
33K
0W125
0805
C360
4N7
100V
FKP2
C362
1N0
100V
FKP2 C364
330P
100V
FKP2
R313
1K0
0W125
0805
R360
22K
0W125
0805
R374
33K
0W125
0805
Q328
Q337
Q320
AUX2 INPUT
X0
4
X1
5
X2
6
X3
7
X4
12
X5
11
X6
10
X7
9
EN
2
A0
1
A1
16
A2
15
V-
3
D8
GND
14
V+ 13
IC300
DG408DY
SO-16
AUX2 L
CD L
TUNER L
AV L
DVD L
AUX L
PHONO L
-15V(A)
+15V(A)
+5V(A)
0V(SIG)
X0
4
X1
5
X2
6
X3
7
X4
12
X5
11
X6
10
X7
9
EN
2
A0
1
A1
16
A2
15
V-
3
D8
GND
14
V+ 13
IC301
DG408DY
SO-16
AUX2 R
CD R
TUNER R
AV R
DVD R
AUX R
PHONO R
+5V(A)
0V(SIG)
TAPE_1_PRE
TAPE_2_PRE
TAPE_0_PRE TAPE_0_PRE
TAPE_1_PRE
TAPE_2_PRE R331
1M0
0W125
0805
R330
1M0
0W125
0805
ONLY ON P80
-15V(A)
+15V(A)
C304
10N
100V
0805
C305
10N
100V
0805
0V(SIG)
0V(SIG)
0V(SIG)
-15V(A)
+15V(A)
C309
10N
100V
0805
C307
10N
100V
0805 0V(SIG)
-15V(A)
+15V(A)
C316
10N
100V
0805
C315
10N
100V
0805 0V(SIG)
-15V(A)
+15V(A)
C303
10N
100V
0805
C302
10N
100V
0805 0V(SIG)
R390
3K3
0W125
0805
C371
220UF
16V
YK
R391
3K3
0W125
0805
-15V(A)
R352 22K
0W125 0805 R356 22K
0W125 0805
R353 22K
0W125 0805 R357 22K
0W125 0805R354 22K
0W125 0805 R358 22K
0W125 0805
R355 22K
0W125 0805 R359 22K
0W125 0805 R386
3K3
0W125
0805
C368
220UF
16V
YK
R389
3K3
0W125
0805
-15V(A)
R371 22K
0W125 0805
R361 22K
0W125 0805
R379
10K
0W125
0805
R380
10K
0W125
0805
R393
3K3
0W125
0805
R388
3K3
0W125
0805
R392
3K3
0W125
0805
R387
3K3
0W125
0805
R397
10K
0W125
0805
R395
10K
0W125
0805
R396
4K7
0W125
0805
R394
4K7
0W125
0805
VOUTR 11
DGND
5
AGNDR
10
VINR
9
SDO
7
AGNDL
15
VD+ 4 VA+ 12
VOUTL 14
SDI
3
ZCEN
1
CS
2
SCLK
6
MUTE
8
VINL
16
VA-
13
IC309
PGA2310UA
SO-16W
LISTEN_2
LISTEN_1
LISTEN_0
VOL_SDATA
VOL_SCLK
VOL_SCLK_PRE
VOL_SDATA_PRE
LISTEN_0_PRE
LISTEN_1_PRE
LISTEN_2_PRE
FROM SHEET 6
-15V(A)
+15V(A)
C310
10N
100V
0805
C311
10N
100V
0805
0V(SIG)
-15V(A)
+15V(A)
C318
10N
100V
0805
C319
10N
100V
0805
0V(SIG)
-15V(A)
+15V(A)
+5V(A)
+15V(A)
+5V(A)
-15V(A)
TAPE_2
0V(SIG) 0V(SIG)
0V_SER_PRE 0V_SER
TAPE_1
TAPE_0
TAPE_0_PRE
TAPE_1_PRE
TAPE_2_PRE
TR300
BC849B
SOT-23
R385
3K3
0W125
0805
C339
1N0
100V
0805
R398
0R0
0W125
0805
0V(SIG)
C366
220UF
16V
YK
-15V(A)
C365
220UF
16V
YK
-15V(A)
R375
2K2
0W125
0805
R376
2K2
0W125
0805
R377
2K2
0W125
0805
R378
2K2
0W125
0805
+4.8V_D_PRE
(Sheet 7)
SP300
ANNOTATION
C355
47P
100V
0805
C356
47P
100V
0805
P320
P334
P335
P337
P336
P338
P339
P340
P341
P319 P332
P331
P330
P329
P328
P327
P326
P325
P343
P344
P349
P350
P351
P355 P354
P358
P360
P352
P363
FIT ON P80
FIT ON P80
FIT ON P80
FIT ON P80
FIT ON P80
*PRE_RLY
NF
VOL_*CS
VOL_*CS_PRE
VOL_*CS_PRE
R338
10R
0W125
0805
0V(SIG)
0V(SIG_2) 0V(SIG_2)
VINL
VINR
VOUTL
VOUTR
P300
P302
P301
P303
P304
P305
ITEM301 2 Pad Damping 15x6x3MM SorbothaneE802AP 1/2 pad placed on top of C386, C387, C388 & C389 (NF on P80)
4 of theseNF on P80
R399
22K
0W125
0805
C375
100UF
25V
ZA
C383
100UF
25V
ZA
NF
03_E116 TGP NO CHANGE TO THIS SHEET 2.117 APR 03
03_E120 TGP 13 May 03 LEDs, BIAS & DOCUMENTATION CHANGE 3.0
03_E147 MJT 23 May 03 None to this sheet. PCB change. 4.0
03_E230 MJT 04 Aug 03 None to this sheet. Display snapoff fixing holes reduced to 3.2mm 5.0
A80
03_E264 MJT 09 Sept 03 None to this sheet. Remove EMC can from around IEC inlet. 5.1

ISSUE
DRAWING NO.
DRAWING TITLE
DATE
Filename:
ECO No. DESCRIPTION OF CHANGE
L916TX_1.0.Sch
DiVA A80 Power Transformer
Contact Engineer:
L916TX
21-Feb-2003
INITIALS
Printed:
1 1Sheet of
Notes:
Contact Tel: [phone]Travis Pierce
A & R Cambridge Ltd.
Pembroke Avenue
Cambridge CB5 9PB
Waterbeach

BLUE
BLACK
ORANGE
GREEN
PRIMARY SECONDARY
+6800uF
TEST CIRCUIT
Load
+Vout
-Vout
PRIMARIES
BLACK
GREY
BLUE
GREEN/YELLOW
B: 125mm max
SCREEN WIRE
Transformer Specification for 115/230V 50/60Hz mains transformer (for audio).
Arcam Part Number L916TX.
To standards BS415 / EN60065 / Class I / EN60742 / UL506.
All solid copper leadout wires to be insulated and colour coded with UL
PVC105°C sleeving.
Material Safety Specification
---------------------------------------------------
1. Winding Wire to be Grade 2 (130°C rating) to BS 60317-4 1995.
2. Mylar Polyester Insulator Rated to 130°C.
Electrical Specification
---------------------------------------------------
3. Transformer to have dual 115V primaries to allow parallel operation for 115V
input and series operation with 230V input.
4. Transformer input voltage range as follows:
115V -15% +15% (97.5V to 132.5V)
230V -15% +15% (195V to 265V)
5. Transformer to have 2 high-power secondary windings as shown in the
adjacent drawing.
6. Loaded DC voltages specified at 230V AC in (with transformer primaries in
series).
7. Centre-tapped secondary windings to have a full wave (4 diode) bridge to
produce dual polarityDC rails; high power winding output voltage to comply to
test specifications given (see Test Circuit and Test Specifications at right).
8. Windings to be evenly spaced with minmal gaps; magnetic radiation should be
minimised.
9. Max core flux density 1.5T at nominal rating (referred to M4 core material; see
14 below).
10. Core must not saturate at 20% over nominal primary voltage.
11. Temperature rise to be less than 60°C at 30%duty cycle (referred to 230V
input voltage and On-Load current).
Mechanical Specification
---------------------------------------------------
12. Primary wires self-ended and individually sleeved, then sleeved together.
Secondary wires self-ended and individually sleeved. Low power secondary
centre tap to share common sleeve. Use PVC sleeving.
13. Primary/Secondary leadout separation to be minimised.
14. Product is for hi-fi audio; hum must be minimised.
15. All wire lengths are +20, -0 mm. All wires stripped 8 +/-2mm and tinned.
A: 55mm max
LEADS EXIT NEAR TOP
HIGH POWER SECONDARIES
120MM
140MM
Interwinding Screen
+6800uF
115V ac
115V ac
BLUE
GREY
BLACK + WHITE
DRAWING NOT TO SCALE
TOP VIEW
Trough Voltage
+Vout
OUTPUT WAVEFORM
0V (Black + White)
Peak Voltage
63V
63V
GBU8D 8A 200V
TEST SPECIFICATIONS
Input Voltage (series primaries) 230V 265V
Max Off-Load Peak Voltage
Min On-Load Trough Voltage 41 +1.5/-0 V
On-Load Current
100mA
6.0A
Off-Load Current -
-
6.0A
63V
-
TGP 21 Feb 03 1.0
17Vac @ 100mA*
17Vac @ 100mA*
ORANGE
BLUE
ORANGE
WHITE
(Approximate Test Circuit DC output voltage with ripple)
3.2Vac @ 55mA*
WHITE
WHITE
* - wire diameter at least 0.4mm
(may have 5mm 'bulge' for leadouts & sleeves)
3.2Vac WINDING
330MM
230MM
17Vac WINDINGS
03_E059 Production Issue
160MM

ISSUE
DRAWING NO.
DRAWING TITLE
DATE
Filename:
ECO No. DESCRIPTION OF CHANGE
L917TX_1.0.Sch
100V DiVA A80 Power Transformer
Contact Engineer:
L917TX
17-Apr-2003
INITIALS
Printed:
1 1Sheet of
Notes:
Contact Tel: [phone]Travis Pierce
A & R Cambridge Ltd.
Pembroke Avenue
Cambridge CB5 9PB
Waterbeach

BLUE
BLACK
ORANGE
GREEN
PRIMARY SECONDARY
+6800uF
TEST CIRCUIT
Load
+Vout
-Vout
PRIMARIES
BLACK
GREY
BLUE
GREEN/YELLOW
B: 125mm max
SCREEN WIRE
Transformer Specification for 100V 50/60Hz mains transformer (for audio).
Arcam Part Number L917TX.
To standards BS415 / EN60065 / Class I / EN60742 / UL506.
All solid copper leadout wires to be insulated and colour coded with UL
PVC105°C sleeving.
Material Safety Specification
---------------------------------------------------
1. Winding Wire to be Grade 2 (130°C rating) to BS 60317-4 1995.
2. Mylar Polyester Insulator Rated to 130°C.
Electrical Specification
---------------------------------------------------
3. Transformer to have dual 100V primaries to allow parallel operation with 100V
input.
4. Transformer input voltage range as follows:
100V -15% +15% (85V to 115V)
5. Transformer to have 2 high-power secondary windings as shown in the
adjacent drawing.
6. Loaded DC voltages specified at 100V AC in (with transformer primaries in
parallel).
7. Centre-tapped secondary windings to have a full wave (4 diode) bridge to
produce dual polarityDC rails; high power winding output voltage to comply with
test specifications given (see Test Circuit and Test Specifications at right).
8. Windings to be evenly spaced with minmal gaps; magnetic radiation should be
minimised.
9. Max core flux density 1.5T at nominal rating (referred to M4 core material; see
14 below).
10. Core must not saturate at 20% over nominal primary voltage.
11. Temperature rise to be less than 60°C at 30%duty cycle (referred to 100V
input voltage and On-Load current).
Mechanical Specification
---------------------------------------------------
12. Primary wires self-ended and individually sleeved, then sleeved together.
Secondary wires self-ended and individually sleeved. Low power secondary
centre tap to share common sleeve. Use PVC sleeving.
13. Primary/Secondary leadout separation to be minimised.
14. Product is for hi-fi audio; hum must be minimised.
15. All wire lengths are +20, -0 mm. All wires stripped 8 +/-2mm and tinned.
A: 55mm max
LEADS EXIT NEAR TOP
HIGH POWER SECONDARIES
120MM
140MM
Interwinding Screen
+6800uF
100V ac
100V ac
BLUE
GREY
BLACK + WHITE
DRAWING NOT TO SCALE
TOP VIEW
Trough Voltage
+Vout
OUTPUT WAVEFORM
0V (Black + White)
Peak Voltage
63V
63V
GBU8D 8A 200V
TEST SPECIFICATIONS
Input Voltage (parallel primaries) 100V 115V
Max Off-Load Peak Voltage
Min On-Load Trough Voltage 41 +1.5/-0 V
On-Load Current
100mA
6.0A
Off-Load Current -
-
6.0A
63V
-
TGP 17 April 03 1.0
17Vac @ 100mA*
17Vac @ 100mA*
ORANGE
BLUE
ORANGE
WHITE
(Approximate Test Circuit DC output voltage with ripple)
3.2Vac @ 55mA*
WHITE
WHITE
* - wire diameter at least 0.4mm
(may have 5mm 'bulge' for leadouts & sleeves)
3.2Vac WINDING
330MM
230MM
17Vac WINDINGS
PRODUCTION RELEASE
160MM
03_E118

1
2
3
4
10
11
6
7
8
9
5
12
13
14
15
16
17
37
18
19
20
21
22
22
23
24
25
26
27
27
27
27
27
28
29
29
30
31
32
32
32
33
34
35
36
I
II
III
IV
III
IV
I
I
x3
x4
x3
x2
x2
AROUND
PRIMARIES
x7
x8
x5 x2
x4
x4
x9
x10
x3 ONTO LED'S
INTO SUB-PANEL
x2
INTO CONNECTOR
ON PCB
x2