Diva A80 User manual

DiVA Service
Manual
A80 Amplifier
P80 Power Amplifier
Issue 1.0
ARCAMARCAM
Bringing music & movies to lifeBringing 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
2 3 4 2 5
-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
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 EMC can 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
2 3 4 2 5
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 shown here
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 BoM as 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
2 3 4 2 5
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
3
1
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

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
2 3 4 2 5
->
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
3
1
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

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
2 3 4 2 5
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-14
5
6
7
IC700B
LM324D
SO-14
3
2
1
411
IC700A
LM324D
SO-14
10
9
8
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
2 3 4 2 5
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
2
3
IC600A
74HC00D
SO-14
11
12
13
IC600D
74HC00D
SO-14
4
5
6
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
8
IC604B
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

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
2 3 4 2 5
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
5
7
IC305B
TL072CD
SO-8
2
3
1
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
5
7
IC307B
NJM2114M
DMP-8
6
5
7
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
5
7
IC304B
TL072CD
SO-8
2
3
1
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
3
1
84
IC306A
NJM2114M
DMP-8
6
5
7
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
3
1
84
IC307A
NJM2114M
DMP-8
2
3
1
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