Arcam Alpha 7 User manual

ALPHA 7/8/9 CD SERVICE MANUALALPHA 7/8/9 CD SERVICE MANUAL
Arcam Alpha 7/8/9 CD Service Manual
Issue 1 Serial No. 0001 - (Paul Newton July 96)
Circuit Description
The following notes describe the operation of the
Alpha 7/8/9 CD players. They include the circuitry on
the main, DAC and display PCBs but not that on the
servo PCB attached to the mechanism.
Power Supplies
The mains input is fitted with inductors L2,3,6,7 to
filter electromagnetic interference coming out of the
player.
Mains transformer T201 has three secondary
windings supplying two separate power supplies and
an AC supply for the display filament:
Analogue Supply
Bridge rectifier D4,5,6,7 and reservoir capacitors
C209-C212 produce unregulated split rails of about
+/-22V.
Z204 and Z205 provide regulated outputs of +18V
and -18V respectively that power the opamps in the
audio output stage.
Sincethereisnopowerswitchonthissecondary,the
analogue supplies are always connected.
Digital Supply
Switch SW201-A disconnects the digital secondary
winding when the 'Power' switch is out.
An unregulated supply of about 11V is produced by
the bridge rectifier D8,9,10,11 and reservoir
capacitor C36.
This is then regulated to provide three +5 volt
supplies (Z208 general logic supply, Z207 DAC
supply, Z203 system clock generator supply) and a
+7.3v supply for themechanism and motor drive
circuits(Z206).
A-30v supply is formed by Z209 and associated
components to power the display grid.
Muting
When the unit is turned off SW201-A discharges
capacitor C29 quickly. This along with the AMUTE
signal from the microprocessor, controls the output
mute transistors Q1,101 via level shifter Q3.
Clock Generator
Thesystemclockisgeneratedbyadiscreteoscillator
basedaroundQ2and16.9344MHzoscillatorX1.The
output of Q2 is amplified and buffered by inverters
Z202-E & D and sent to the clock input of the DAC
Z201.
DAC & Audio Outputs (Alpha 7 only)
The DAC is a Delta-Sigma design from Burr Brown,
the PCM1710U.
The serial digital data from the decoder Z206 is input
to pins 1 to 3. The system clock is input to pin 5.
The DAC is powered entirely from one 5V supply,
although it is split and decoupled between the
analogue and digital sections of the device.
The analogue outputs from each channel are
processed identically.Three poles of filtering are
providedbytheactivefilterbasedaroundZ1-A.Z1-B
buffers the audio output and sets the output level.
Muting is provided by turning on Q1 and Q101.
DAC & Audio Outputs (Alpha 8 only)
This is a similar circuit as the one used on the Arcam
Alpha 6 DAC PCB but designed for Sony format
input data and a better digital filter, the SM5843AP1,
Z14.The digital filter is used with a SM5864AP 20-bit
DAC chip, Z12, (described here as a PWM noise
shaper to avoid confusion with the 1-bit DAC Latch
whichfollows it).The outputfromthisisre-latched by
Z7, Z8.
Digital FilterAPIC micro on the mother board
controls the filter with the signals RB0 to RB7. The
SM5843 filter has internal pull-up resistors on its
inputs resulting in RB4 & RB5 being logic 1.
The SM5843APT requires several control lines from
the PIC...
RB7 FSEL2, Selects sampling rate for de-emphasis.
Static low for 44.1K.
RB6 FSEL1, Selects sampling rate for de-emphasis.
Static low for 44.1K.
RB5 IW2N, Selects input word length. Static high for
16 bits.
RB4MDT, Serialdatainputforvolume control.Burst
at switch-on for setting to full.
RB3 RSTN, Reset line. Short pulse low at switch on,
then static high.
RB2 MLEN, Serial data latch input for volume
control.
RB1 MCK, Serial clock input for volume control.
RB0 Not connected.
No Dither On Silence
The digital filter adds ‘dither’ to the output signal.
Thisimprovesthelow-levelperformanceoftheDAC.
The PWM filter normally mutes when it detects
digital silence to prevent any unwanted noise and
idle-tones on the audio outputs when no music is
playing. A slight click is audible when this happens.
Unfortunately, the added dither prevents this mute
from operating because it holds it open. Q11 detects
digital silence on the data input to the filter. When
silence is detected, the dither function is switched off

ALPHA 7/8/9 CD SERVICE MANUALALPHA 7/8/9 CD SERVICE MANUAL
16.9344MHz Low-Jitter
SystemClock,X1,Q5&Z13
SM5843AP1
DigitalFilter,
Z14
74HC74
Latches,
Z7&Z8
SM5864PWM
NoiseShaper,Z12
AnalogueFilter,
Z1, Z2, Z3, Z4
SonyFormatDigital
Audio
ControlfromPICmicro
(Z211)onmainpcb
Audioout
Clock
Block Diagram of Alpha 8 DAC PCB
allowing the PWM filter’s mute to operate as normal.
Mute Relay
The mute relay is controlled from the PIC micro via
RA0 after switch-on. In Standby mode, XRST is low
which interrupts the relay via Q9. RA0 is low when
the CD player comes out of standby mode and goes
high after a short settling delay.
The power rail, RLYPWR, is un-regulated and has a
small reservoir capacitor (on the mother board) so
that the relay is released very soon after the mains is
disconnected from the CD player before the other
power supply rails collapse.
PWM noise shaper
To reduce EMC, the clock signal going into this chip,
Z12, is very weak on the XTI pin (23) pin, taken
directly off Q5. This is amplified so that there should
be a larger signal on the CKO pin (26).
The PWM output on pins 11, 13, 16 and 18 can be
resolved into an audio waveform on a scope simply
by measuring them through a 100K resistor. The
same is true for the PWM signals through the latch
and the level shifter.
Latch
The PWM data from Z12 is re-latched using 74HC74
latches, Z7 and Z8.The power supply for these chips
is the DAC voltage reference and the output drives
the analogue filter stage directly. The latches reduce
any edge-timing jitter induced on the PWM signal
coming from Z12.
Analogue filter
The first half of the analogue filter, Z3 and Z4 is
balanced.Thesignalthroughonesideoftheop-amp,
pin 1, should be phase inverted with respect to the
other, pin 7. These signals should be viewed on a
scope through a 100K resistor since there may still
be quite a lot of RF noise on the signal.
Z1 and Z2 filter the audio signal further and also
convert the balanced signal into a single ended
signal. Z18 acts as a DC servo to reduce the output
offsetvoltage.Thishasavery large time constant so
an offset as high as 50mV is possible when the unit
is first plugged in. This reduces to less than 3mV
after 10 minutes and stays low if the unit is switched
off and on with the Standby button.

ALPHA 7/8/9 CD SERVICE MANUALALPHA 7/8/9 CD SERVICE MANUAL
Test Points Marked on Circuit Diagram Only
Test Points Measurement Information
17MHz Clock Output to mother board. 16.9344MHz +/- 40ppm, 4V to 5V peak to peak square wave.
AGND Analogue ground point.
AMUTE Digital audio mute input on SK203. 0V=off, 5V=Mute.
CK Serial Data clock input on SK203. Sony format.
DA Serial Data data input on SK203. Sony format.
CLKSYNC Crystal clock override. A 16.9344MHz HCMOS clock can be injected from an external source.
DEEM De-emphasis select input on SK203. 0V=off, 5V=On.
DGND Digital ground point.
LOUT Left channel audio output at SK1. Measure d.c. offset at switch-on and after 1 minute, see specifications.
LR Serial Data LR input on SK203. Sony format.
MUTERLY Mute Relay Voltage. Equal to RLYPWR voltage when output is muted and 0V d.c. +0.5V,-0.0V when
output is un-muted.
N15 Regulated analogue supply. -15V d.c. +/- 0.6V.
N18V -18.45V d.c. +/- 0.5V supply input on SK204 for analogue.
P5V(0) +5V d.c. +/- 0.3V digital filter supply input on SK204.
P5V(1) +5V d.c. +/- 0.3V PWM noise shaper supply input on SK204.
P5VCLK Regulated clock supply. +5V d.c. +/- 0.3V.
P15 Regulated analogue supply. +15V d.c. +/- 0.6V.
P18V(0) +18.45V d.c. +/- 0.5V supply input on SK204 for analogue.
P18V(1) +18.45V d.c. +/- 0.5V supply input on SK204 for clock and latch.
PWRGND Power ground point. Used by mute relay only.
RA0 Mute relay control from PIC micro on SK203.
RB0-RB7 Control lines from PIC micro on SK203.
REFL DAC reference voltage, left channel. +5V +/- 0.3V.
REFR DAC reference voltage, right channel.
RLYPWR +12V d.c. +/- 1V supply input for mute relay on SK204.
ROUT Right channel audio output at SK1. Measure d.c. offset at switch-on and after 1 minute, see
specifications.
SRVL Left d.c. servo voltage. -10 to +10V d.c.
SRVR Right d.c. servo voltage.
SYSCLK Clock used by latches. 4V to 5V peak to peak square wave at 16.9344MHz.

ALPHA 7/8/9 CD SERVICE MANUALALPHA 7/8/9 CD SERVICE MANUAL
Disc Transport Module
The CDM 14 module comprises the disc loading
mechanism, laser assembly, RF amplifier and
analoguesignalprocessing. Alltheservo controland
motor drive circuits are also included.
Digital Signal Processor
Mute, attenuation and de-emphasis functions are
controlledvia athree-wireserial busfromthe system
controller (Z212) to pins 26, 27 & 28 of the DAC
(Z201).
Digital audio is input to the DAC on pins 1, 2& 3 in
standard Sony format i.e. Word Clock, Data and Bit
Clock.
Adigital output complying to the SPDIF standard is
generated by the decoder on the mechanisim
assembly. This is passed through an isolating
transformer, T202, to the digital output socket SK5.
System Controller
The CXP826P16Q system controller (Z212) is a
combined CD player controller, keyboard scanner,
remote control decoder and fluorescent display
driver. It's clock is generated by 4.00MHz resonator
X201.
The controller detects the position of the disc drawer
from the status of two microswitches, INSW &
OUTSW, on socket SK205. The drawer motor is
controlled via motor driver Z210
Thekeyboardscanningworksbyconnectingthekeys
to a resistor ladder on an ADC (analogue to digital
convertor) input to the microcontroller. Pressing a
key presents a unique voltage to this input.
The signal from the remote control receiver is input
to RMIN (pin 2) after first passing through the PIC
microcontroller, Z211, on the small remote receiver
pcb. This PIC ic converts the RC-5 format codes
from the remote control handsets to NEC data,
suitable for the Sony chipset. It also controls
theconfigurationof thedigitalfilter/DAConthe Alpha
8and 9 DAC boards the The remote control data
contains a ‘customer code’ that identifies it as an
Arcam product.The microcontroller is confiqured to
accept this code by means of the diode network
D291 to D297.
Disassembly For Servicing
To remove the boards within the CD players follow
the instructions below.
1. Remove the top cover.
2. Press load to eject the CD tray.
3. Unplug the unit from the mains.
4. Push the tray front upwards to remove it
from the tray. Push the tray in manually.
5. Removethe4 screwsholdingthe frontpanel
to the chassis and release the locating tabs.
6. Unplug the flexfoil from the display board
where it enters the main pcb.
7. Remove the 2 screws holding the remote
receiver pcb in place.
8. The front panel can now be pulled off the
unit.
9. To remove the display pcb remove the 6
screws holding the board in place.
To remove the main pcb first remove the DAC board
if it is an Alpha 8 or 9 CD player.
1. Remove the 3 screws holding the audio
output sockets to the rear panel and 2
screws holding the aluminium extrusion in
place.
2. Squeeze the tops of the 2 pcb pillars and lift
the board up slightly to clear them .
3. Remove the 2 flexfoils from the DAC board.
The DAC board, still attached to the extrusion, can
now be removed from the unit.
To remove the main pcb remove the 8 pcb securing
screwsand thescrewholdingthedigital ouputsocket
to the chassis. (On Alpha 7 CDs also remove the 3
screws securing the audio ouput sockets in place).
Release the cables which connect the mechanism to
the main board.
The main pcb can now be slid out of the case.

ALPHA 7/8/9 CD SERVICE MANUALALPHA 7/8/9 CD SERVICE MANUAL
Alpha 7/8/9 Main PCB Parts List
Ref. No. Description Part No.
C2 PPRO 680P 63V 5% RA 2D168
C3 PPRO 680P 63V 5% RA 2D168
C4 ELST NON POLAR 10UF 35V 2U610
C5 PPRO 100P 63V 5% RA 2D110N
C6 PPRO 680P 63V 5% RA 2D168
C7 PPRO 680P 63V 5% RA 2D168
C10 CERD 1N0 63V 2A210
C11 CERD 10N 100V 20% 2A310
C12 CERD 10N 100V 20% 2A310
C13 CERD 33P 63V 2A033
C14 CERD 33P 63V 2A033
C15 CERD 100P 63V 2A110
C16 CERD 100P 63V 2A110
C17 CERD 10N 100V 20% 2A310
C18 CERD 10N 100V 20% 2A310
C19 CERD 10N 100V 20% 2A310
C20 PPRO 680P 63V 5% RA 2D168
C21 ELST NON POLAR 10UF 35V 2U610
C22 ELST 100U 25V 2N710
C23 ELST 100U 25V 2N710
C24 ELST 100U 25V 2N710
C25 ELST 22U 20V OSCON 2P622
C26 ELST 100U 25V 2N710
C27 ELST 10U 50V 2N610
C28 CERD 470P 63V 2A147
C29 ELST 100U 25V 2N710
C32 CERD 10N 100V 20% 2A310
C33 ELST 1M0 25V 2N810
C34 ELST 100U 100V 2N710B
C35 ELST 100U 100V 2N710B
C36 ELST 3M3 25V 2N833
C37 ELST 10U 50V 2N610
C38 ELST 10U 50V 2N610
C39 ELST 100U 25V 2N710
C40 ELST 100U 25V 2N710
C41 ELST 100U 25V 2N710
C42 ELST 100U 25V 2N710
C43 ELST 1M0 25V 2N810
C44 ELST 1M0 25V 2N810
C45 ELST 1M0 25V 2N810
C46 ELST NON POLAR 10UF 35V 2U610
C47 ELST 1M0 25V 2N810
C48 ELST 1M0 25V 2N810
Alpha 7/8/9 Main PCB Parts List
Ref. No. Description Part No.
C49 ELST 10U 50V 2N610
C50 ELST 10U 50V 2N610
C51 ELST 1M0 25V 2N810
C52 CERD 10N 100V 20% 2A310
C53 ELST 22U 20V OSCON 2P622
C54 CERD 10N 100V 20% 2A310
C55 CERD 10N 100V 20% 2A310
C56 ELST 10U 50V 2N610
C102 PPRO 680P 63V 5% RA 2D168
C103 PPRO 680P 63V 5% RA 2D168
C104 ELST NON POLAR 10UF 35V 2U610
C105 PPRO 100P 63V 5% RA 2D110N
C291 CERD 47N 63V 10% 2A347
C292 ELST 100U 25V 2N710
C293 CERD 47N 63V 10% 2A347
C294 CERD 47N 63V 10% 2A347
D1 SSDIODE 1N4148 75V 3A4148
D2 SSDIODE 1N4148 75V 3A4148
D3 SSDIODE 1N4148 75V 3A4148
D4 RECTIFIER 1N4003F 1A 200V 3B4003
D5 RECTIFIER 1N4003F 1A 200V 3B4003
D6 RECTIFIER 1N4003F 1A 200V 3B4003
D7 RECTIFIER 1N4003F 1A 200V 3B4003
D8 RECTIFIER 1N4003F 1A 200V 3B4003
D9 RECTIFIER 1N4003F 1A 200V 3B4003
D10 RECTIFIER 1N4003F 1A 200V 3B4003
D11 RECTIFIER 1N4003F 1A 200V 3B4003
D12 RECTIFIER 1N4003F 1A 200V 3B4003
D13 RECTIFIER 1N4003F 1A 200V 3B4003
D14 RECTIFIER 1N4003F 1A 200V 3B4003
D15 RECTIFIER 1N4003F 1A 200V 3B4003
D16 RECTIFIER 1N4003F 1A 200V 3B4003
D17 ZENER 15V 400MW 3C11504
D18 ZENER 7V5 400MW 3C07504
D19 ZENER 4V7 400MW 3C04704
D20 ZENER 4V7 400MW 3C04704
D21 SSDIODE 1N4148 75V 3A4148
D22 RECTIFIER 1N4003F 1A 200V 3B4003
D23 RECTIFIER 1N4003F 1A 200V 3B4003
D291 SSDIODE 1N4148 75V 3A4148
D292 SSDIODE 1N4148 75V 3A4148
D293 SSDIODE 1N4148 75V 3A4148
D294 SSDIODE 1N4148 75V 3A4148

ALPHA 7/8/9 CD SERVICE MANUALALPHA 7/8/9 CD SERVICE MANUAL
D295 SSDIODE 1N4148 75V 3A4148
D296 SSDIODE 1N4148 75V 3A4148
D297 SSDIODE 1N4148 75V 3A4148
DISP301 DISPLAY ALPHA 7/8/9 (SONY) B1008
F1 INS COVER PCB FUSEHOLDER F022
F1 FUSE 20mm 160mA T C11166
F1 / FUSEHOLDER 20mm PCB 8S004
F2 / FUSEHOLDER 20mm PCB 8S004
F2 INS COVER PCB FUSEHOLDER F022
F4 FUSE 20mm 160mA T C11166
F4 SPARE FUSEHOLDER F062
HS1 HEATSINK TO220 CLIP 30 F007
HS2 HEATSINK TO220 8.6 DEGC/W F008
HS2 HEATSINK CLIP TO220 13/8.6 DC/W F006
L1 FERRITE BEAD SINGLE AXIAL TAPED 2K BOX 7F003
L2 INDUCT 1R0 283AS-1R0K 34-10914 7D001
L3 INDUCT 1R0 283AS-1R0K 34-10914 7D001
L4 33UH IND 34-48330 7D033
L5 33UH IND 34-48330 7D033
L6 6U8H INDUCTOR 7D968A
L7 6U8H INDUCTOR 7D968A
LED201 LED RED 5MM 3D5119
LED301 LED GREEN 5MM 3D001
LK101A JUMPER 4-WAY LEAD L814CA
PAD1 Alpha 7/8/9 CD SUPPORT PAD E805AP
PL1 16 WAY DIL PIN HEADER 8K6316
Q1 TRANS LF SS N BC547B 4A547
Q2 TRANS LF SS N BC547B 4A547
Q3 TRANS LF SS P BC557B 4A557
Q4 TRANS LF SS N BC547B 4A547
Q5 TRANS LF SS N BC547B 4A547
Q6 TRANS LF SS N BC547B 4A547
Q101 TRANS LF SS N BC547B 4A547
R2 RES MF W4 3K9 1% 1H239
R3 RES MF W4 3K9 1% 1H239
R4 RES MF W4 3K9 1% 1H239
R5 RES MF W4 1% 10K 1H310
R6 RES MF W4 1% 10K 1H310
R7 RES MF W4 1% 33K 1H333
R8 RES MF W4 3K9 1% 1H239
R9 RES MF W4 3K9 1% 1H239
R10 RES MF W4 22K 1% 1H322
R11 RES MF W4 120R 1% 1H112
R12 RES MF W4 22R 1% 1H022
R13 RES MF W4 1% 10K 1H310
R14 RES MF W4 1% 10K 1H310
R15 RES MF W4 1% 10K 1H310
R16 RES MF W4 330R 1% 1H133
R17 RES MF W4 1% 10K 1H310
R18 RES MF W4 1% 33K 1H333
R19 RES MF W4 1% 33K 1H333
R20 RES MF W4 22R 1% 1H022
R21 RES MF W4 470R 1% 1H147
R22 RES MF W4 1% 220R 1H122
R23 RES MF W4 120R 1% 1H112
R24 RES MF FU W3 5% 10R NFR25 1G010
R25 RES MF W4 120R 1% 1H112
R26 RES MF W4 100K 1% 1H410
R27 RES MF W4 100K 1% 1H410
R28 RES MF W4 1% 10K 1H310
R29 RES MF W4 1% 1K0 1H210
R30 RES MF W4 1% 10K 1H310
R31 RES MF W4 330R 1% 1H133
R32 RES MF W4 330R 1% 1H133
R33 RES MF W4 330R 1% 1H133
R34 RES MF W4 1% 10K 1H310
R35 RES MF W4 4M7 1% 1H547
R36 RES MF W4 1% 620R 1H162
R37 RES MF FU W3 5% 10R NFR25 1G010
R38 RES MF W4 330R 1% 1H133
R39 RES MF W4 1% 220R 1H122
R40 RES MF W4 1% 220R 1H122
R41 RES MF W4 1K6 1% 1H216
R42 RES MF W4 1% 1K0 1H210
R43 RES MF W4 330R 1% 1H133
R44 RES MF FU W3 5% 3R3 NFR25 1G833
R45 RES MF FU W3 5% 3R3 NFR25 1G833
R46 RES MF W4 3K0 1% 1H230
R47 RES MF W4 3K0 1% 1H230
R48 RES MF FU W3 5% 10R NFR25 1G010
R49 RES MF W4 120R 1% 1H112
R50 RES MF W4 100K 1% 1H410
R51 RES MF FU W3 22R 5% NFR25 1G022
R52 RES MF FU W3 22R 5% NFR25 1G022
R53 RES MF W4 1% 33K 1H333
R54 RES MF W4 330R 1% 1H133
R55 RES MF W4 1% 680R 1H168
R56 RES MF W4 330R 1% 1H133
R57 RES MF W4 330R 1% 1H133
R58 RES MF FU W3 5% 10R NFR25 1G010

ALPHA 7/8/9 CD SERVICE MANUALALPHA 7/8/9 CD SERVICE MANUAL
R59 RES MF W4 330R 1% 1H133
R60 RES MF W4 1% 8K2 1H282
R61 RES MF W4 1% 8K2 1H282
R62 RES MF W4 330R 1% 1H133
R63 RES MF W4 1% 33K 1H333
R64 RES MF FU W3 5% 10R NFR25 1G010
R102 RES MF W4 3K9 1% 1H239
R103 RES MF W4 3K9 1% 1H239
R104 RES MF W4 3K9 1% 1H239
R105 RES MF W4 1% 10K 1H310
R106 RES MF W4 1% 10K 1H310
R107 RES MF W4 1% 33K 1H333
R108 RES MF W4 3K9 1% 1H239
R109 RES MF W4 3K9 1% 1H239
R110 RES MF W4 22K 1% 1H322
R111 RES MF W4 120R 1% 1H112
R112 RES MF W4 22R 1% 1H022
R113 RES MF W4 1% 10K 1H310
R291 RES MF FU W3 5% 3R3 NFR25 1G833
R292 RES MF W4 1% 8K2 1H282
R293 RES MF W4 1% 8K2 1H282
R294 RES MF W4 1% 1K0 1H210
R295 RES MF W4 1% 10K 1H310
R296 RES MF W4 1% 10K 1H310
R297 RES MF W4 1% 10K 1H310
R298 RES MF W4 1% 10K 1H310
R301 RES MF W4 1% 33K 1H333
R302 RES MF W4 1% 12K 1H312
R303 RES MF W4 1% 5K6 1H256
R304 RES MF W4 1% 3K3 1H233
R305 RES MF W4 1% 2K2 1H222
R306 RES MF W4 1% 1K5 1H215
R307 RES MF W4 1% 1K2 1H212
R308 RES MF W4 1% 8K2 1H282
R309 RES MF W4 1% 3K3 1H233
R310 RES MF W4 1% 2K2 1H222
R311 RES MF W4 1% 1K5 1H215
R312 RES MF W4 1% 1K2 1H212
R313 RES MF W4 1% 8K2 1H282
R314 RES MF W4 1% 220R 1H122
RX201 REMOTE CONTROL RX SBX1610-62 38KHZ B2103
SH1 PHONO EMC SHIELD E808MC
SK1 IEC MAINS 2-PIN PCB 8A014
SK2 8+8 WAY FEMALE HORIZ SKT 8K6416
SK4 PHONO SKT 2-WAY HOR EMC 8D222
SK5 PHONO SKT SINGLE EMC 8D220
SK201 23-WAY FFC CONN VERT 8K8023
SK203 32-WAY FFC CONN VERT 8K8032
SK204 23-WAY FFC CONN VERT 8K8023
SK205 5-WAY AMP CT CONN 8K2005
SK291 32-WAY FFC CONN VERT 8K8032
SK301 32-WAY FFC CONN HORIZ 8K8132
SW201 SW PUSH 4PCO A1014
SW301 TACT SWITCH 2-PIN LOW PROF A1504
SW302 TACT SWITCH 2-PIN LOW PROF A1504
SW303 TACT SWITCH 2-PIN LOW PROF A1504
SW304 TACT SWITCH 2-PIN LOW PROF A1504
SW305 TACT SWITCH 2-PIN LOW PROF A1504
SW306 TACT SWITCH 2-PIN LOW PROF A1504
SW307 TACT SWITCH 2-PIN LOW PROF A1504
SW308 TACT SWITCH 2-PIN LOW PROF A1504
SW309 TACT SWITCH 2-PIN LOW PROF A1504
SW310 TACT SWITCH 2-PIN LOW PROF A1504
SW311 TACT SWITCH 2-PIN LOW PROF A1504
SW312 TACT SWITCH 2-PIN LOW PROF A1504
T201 ALPHA 7 CD MAINS TRANSFORMER L811TX
T202 DIGITAL OUTPUT COUPLER K 7E015
X1 CRYSTAL 16.9344MHz PARALLEL 7X012
X201 CER RESON 4.00MHz 7W005
Z1 IC OPAMP DUAL NJM2114D 5B2114
Z101 IC OPAMP DUAL NJM2114D 5B2114
Z201 IC CD DAC PCM1710U 5G1710
Z202 IC HCMOS 74HCU04 5J7404
Z203 IC VREG POS 78L05 5D78L05
Z204 IC VREG POS LM317T 5D317T
Z205 IC VREG POS LM337T 5D337
Z206 IC VREG POS LM317T 5D317T
Z207 IC VREG POS LM317T 5D317T
Z208 IC VREG POS 7805 5D7805
Z209 IC VREG NEG 7915 5D7915
Z210 IC MOTOR DRIVER LB1641 5Q1641
Z211 IC CMOS MICRO PIC16C54XT/P 5H16C54X
Z211 IC SOCKET 18 PIN 0.3'' 8S018
Z212 IC CD CXP826P16Q MICRO 5G826

ALPHA 7/8/9 CD SERVICE MANUALALPHA 7/8/9 CD SERVICE MANUAL
Alpha 8 DAC PCB Only Parts List
Ref. No. Description Part No.
C1 PPRO 2N7 63V 5% RA 2D227
C2 PPRO 2N7 63V 5% RA 2D227
C3 PPRO 2N7 63V 5% RA 2D227
C4 PPRO 2N7 63V 5% RA 2D227
C5 PPRO 2N7 63V 5% RA 2D227
C6 PPRO 2N7 63V 5% RA 2D227
C7 PPRO 1N0 63V 5% RA 2D210
C8 PPRO 1N0 63V 5% RA 2D210
C9 PPRO 1N0 63V 5% RA 2D210
C10 PPRO 1N0 63V 5% RA 2D210
C11 PPRO 1N0 63V 5% RA 2D210
C12 PPRO 1N0 63V 5% RA 2D210
C13 PPRO 470P 63V 5% RA 2D147N
C14 PPRO 470P 63V 5% RA 2D147N
C15 PPRO 470P 63V 5% RA 2D147N
C16 PPRO 470P 63V 5% RA 2D147N
C17 MLC 100P 100V NPO 5% SM 2C110
C18 ELST 10U 50V 2N610
C19 ELST 10U 50V 2N610
C20 PPRO 1N3 63V 5% RA 2D213N
C21 ELST 10U 50V 2N610
C22 PCRB 100N 100V 5% RA 5mm 2H410
C23 ELST 10U 50V 2N610
C24 ELST NON POLAR 10UF 35V 2U610
C25 ELST NON POLAR 10UF 35V 2U610
C26 PPRO 4N7 63V 5% RA 2D247N
C27 PCRB 100N 100V 5% RA 5mm 2H410
C29 ELST 10U 50V 2N610
C30 PPRO 4N7 63V 5% RA 2D247N
C34 MLC 10N 50V X7R 10% SM 2C310
C35 MLC 470P 100V NPO 5% SM 2C147
C36 MLC 470P 100V NPO 5% SM 2C147
C37 MLC 10N 50V X7R 10% SM 2C310
C38 MLC 10N 50V X7R 10% SM 2C310
C39 MLC 10N 50V X7R 10% SM 2C310
C40 MLC 10N 50V X7R 10% SM 2C310
C41 MLC 10N 50V X7R 10% SM 2C310
C42 PPRO 470P 63V 5% RA 2D147N
C43 PPRO 470P 63V 5% RA 2D147N
C44 PPRO 470P 63V 5% RA 2D147N
C45 PPRO 470P 63V 5% RA 2D147N
C46 MLC 100P 100V NPO 5% SM 2C110
C47 MLC 47P 100V NPO 5% SM 2C047
Alpha 8 DAC PCB Only Parts List
Ref. No. Description Part No.
C49 ELST 22U 20V OSCON 2P622
C50 ELST 22U 20V OSCON 2P622
C53 ELST 220U 16V 2N722
C55 MLC 100N 50V X7R 10% SM 2C410
C56 ELST 100U 25V 2N710
C57 ELST 100U 25V 2N710
C58 ELST NON POLAR 10UF 35V 2U610
C59 ELST NON POLAR 10UF 35V 2U610
C60 PPRO 4N7 63V 5% RA 2D247N
C61 PPRO 4N7 63V 5% RA 2D247N
C62 MLC 10N 50V X7R 10% SM 2C310
C63 ELST 470U 25V RA 2N747
C64 ELST 470U 25V RA 2N747
C65 MLC 10N 50V X7R 10% SM 2C310
C66 ELST NON POLAR 2.2UF 50V 2V522
C67 ELST NON POLAR 2.2UF 50V 2V522
C68 MLC 10N 50V X7R 10% SM 2C310
C69 MLC 33P 100V NPO 5% SM 2C033
D1 SSDIODE 1N4148 75V 3A4148
D2 SSDIODE 1N4148 75V 3A4148
L1 33UH IND SM 1812 180mA 7B033
L2 33UH IND SM 1812 180mA 7B033
L3 33UH IND SM 1812 180mA 7B033
L4 33UH IND SM 1812 180mA 7B033
L5 33UH IND SM 1812 180mA 7B033
L6 2U2H INDUCTOR 7D922
Q1 TRANS LF SS N SM BC847B 4A847
Q3 TRANS LF SS N SM BC847B 4A847
Q5 TRANS LF SS N SM BC847B 4A847
Q6 TRANS LF SS N SM BC847B 4A847
Q8 TRANS LF SS N SM BC847B 4A847
Q9 TRANS LF SS N SM BC847B 4A847
Q11 TRANS MOSFET SW ZVNL120A 4K120
R1 RESISTOR SM W4 1K0 2% 1A210
R2 RESISTOR SM W4 1K0 2% 1A210
R3 RESISTOR SM W4 1K0 2% 1A210
R4 RESISTOR SM W4 1K0 2% 1A210
R5 RESISTOR SM W4 1K0 2% 1A210
R6 RESISTOR SM W4 1K0 2% 1A210
R7 RESISTOR SM W4 1K0 2% 1A210
R8 RESISTOR SM W4 1K0 2% 1A210
R9 RESISTOR SM W4 2K2 2% 1A222
R10 RESISTOR SM W4 2K2 2% 1A222

ALPHA 7/8/9 CD SERVICE MANUALALPHA 7/8/9 CD SERVICE MANUAL
R11 RESISTOR SM W4 2K2 2% 1A222
R12 RESISTOR SM W4 2K2 2% 1A222
R13 RESISTOR SM W4 2K2 2% 1A222
R14 RESISTOR SM W4 2K2 2% 1A222
R15 RESISTOR SM W4 2K2 2% 1A222
R16 RESISTOR SM W4 2K2 2% 1A222
R17 RES MF FU W3 10R 5% NFR25 1G010
R18 RESISTOR SM W4 10R 2% 1A010
R19 RESISTOR SM W4 47K 2% 1A347
R20 RESISTOR SM W4 47K 2% 1A347
R21 RES MF FU W3 100R 5% NFR25 1G110
R25 RESISTOR SM W4 0R0 2% 1A000
R34 RESISTOR SM W4 0R0 2% 1A000
R35 RESISTOR SM W4 100R 2% 1A110
R36 RESISTOR SM W4 100R 2% 1A110
R37 RESISTOR SM W4 100R 2% 1A110
R38 RESISTOR SM W4 100R 2% 1A110
R39 RESISTOR SM W4 220R 2% 1A122
R40 RESISTOR SM W4 100R 2% 1A110
R41 RESISTOR SM W4 220R 2% 1A122
R42 RESISTOR SM W4 0R0 2% 1A000
R43 RESISTOR SM W4 100R 2% 1A110
R44 RESISTOR SM W4 100R 2% 1A110
R45 RES MF W4 1K2 1% 1H212
R46 RES MF W4 1K2 1% 1H212
R47 RES MF W4 1K2 1% 1H212
R48 RES MF W4 1K2 1% 1H212
R49 RES MF W4 3K3 1% 1H233
R50 RES MF W4 3K3 1% 1H233
R51 RES MF W4 3K3 1% 1H233
R52 RES MF W4 3K3 1% 1H233
R53 RESISTOR SM W4 1K0 2% 1A210
R54 RESISTOR SM W4 1K0 2% 1A210
R55 RESISTOR SM W4 4K7 2% 1A247
R56 RESISTOR SM W4 11K 2% 1A311
R57 RESISTOR SM W4 11K 2% 1A311
R58 RESISTOR SM W4 18K 2% 1A318
R59 RESISTOR SM W4 18K 2% 1A318
R64 RESISTOR SM W4 47R 2% 1A047
R65 RESISTOR SM W4 47R 2% 1A047
R66 RESISTOR SM W4 100K 2% 1A410
R67 RESISTOR SM W4 470R 2% 1A147
R68 RESISTOR SM W4 10K 2% 1A310
R69 RESISTOR SM W4 10K 2% 1A310
R72 RESISTOR SM W4 100R 2% 1A110
R73 RESISTOR SM W4 100R 2% 1A110
R74 RESISTOR SM W4 100R 2% 1A110
R75 RESISTOR SM W4 100R 2% 1A110
R80 RESISTOR SM W4 2K2 2% 1A222
R81 RESISTOR SM W4 2K2 2% 1A222
R82 RESISTOR SM W4 680K 2% 1A468
R84 RESISTOR SM W4 680K 2% 1A468
R85 RESISTOR SM W4 680K 2% 1A468
R86 RESISTOR SM W4 0R0 2% 1A000
R91 RESISTOR SM W4 0R0 2% 1A000
R92 RESISTOR SM W4 0R0 2% 1A000
R94 RESISTOR SM W4 220R 2% 1A122
R95 RESISTOR SM W4 220R 2% 1A122
R96 RESISTOR SM W4 2K4 2% 1A224
R97 RESISTOR SM W4 2K4 2% 1A224
R98 RESISTOR SM W4 0R0 2% 1A000
R99 RESISTOR SM W4 0R0 2% 1A000
R102 RESISTOR SM W4 0R0 2% 1A000
R103 RESISTOR SM W4 0R0 2% 1A000
R104 RES MF W4 1K2 1% 1H212
R108 RESISTOR SM W4 100K 2% 1A410
R109 RESISTOR SM W4 100K 2% 1A410
R110 RESISTOR SM W4 100K 2% 1A410
R111 RESISTOR SM W4 100K 2% 1A410
R112 RESISTOR SM W4 680K 2% 1A468
R113 RESISTOR SM W4 680K 2% 1A468
R114 RESISTOR SM W4 100K 2% 1A410
R115 RESISTOR SM W4 0R0 2% 1A000
R117 RESISTOR SM W4 0R0 2% 1A000
RLY1 RELAY 960 OHM 51SB12T A205
SH1 PHONO EMC SHIELD E808MC
SK1 PHONO SKT 4-WAY EMC GOLD 8D225
SK203 32-WAY FFC CONN VERT 8K8032
SK204 23-WAY FFC CONN VERT 8K8023
X1 CRYSTAL 16.9344MHz PARALLEL 7X012
X1 GROMMET 8 I/D X 6.5 THK F021
Z1 IC OPAMP SM OP27 5B027S
Z2 IC OPAMP SM OP27 5B027S
Z3 IC AUDIO DUAL SM 4560D 5B4560M
Z4 IC AUDIO DUAL SM 4560D 5B4560M
Z5 IC VREG POS 78L05 5D78L05
Z7 IC HCMOS SM 74HC74 5K7474
Z8 IC HCMOS SM 74HC74 5K7474
Z11 IC VREG POS 78L05 5D78L05
Z12 IC CMOS SDECO DAC SM5864AP 5G5864

ALPHA 7/8/9 CD SERVICE MANUALALPHA 7/8/9 CD SERVICE MANUAL
Z13 IC HCMOS SM 74HCU04 5K7404
Z14 IC DIGITAL FILT SM5843APT 5G5843
Z16 IC VREG POS LM317T 5D317T
Z17 IC VREG POS LM337T 5D337
Z18 IC AUDIO DUAL SM 4560D 5B4560M
Alpha 7/8/9 CD Non PCB Parts, Metalwork etc.
Part No. Description
B3002 BATTERY AA
B2009 CDM14 MECHANISM
E802CH CHASSIS
E802CP ALPHA 7/8/9 CD/TUNER COVERPLATE
E802MI PCB INSULATOR
E806RP REAR PANEL
E810FP ALPHA 7/8 TUNER FASCIA
E813PM CD DRAWER FRONT
E815PM POWER BUTTON
E822PM FOOT
E823PM ALPHA 7 BADGE
E824PM ALPHA 8 BADGE
E825PM ALPHA 9 BADGE
HP006 SNAP RIVET (HOLDS MECH IN PLACE)
L801RC CR14 REMOTE CONTROL HANSET
L807CA FLEX FOILS MAIN BOARD TO DAC PCB
SH054 OWNERS HANDBOOK
SH058 WARRANTY LEAFLET

ALPHA 7/8/9 CD PLAYER MAIN PRINTED CIRCUIT BOARD LAYOUTALPHA 7/8/9 CD PLAYER MAIN PRINTED CIRCUIT BOARD LAYOUT

ALPHA 8 CD PLAYER DAC PRINTED CIRCUIT BOARD LAYOUT (underside view)ALPHA 8 CD PLAYER DAC PRINTED CIRCUIT BOARD LAYOUT (underside view)

ALPHA 8 CD PLAYER DAC PRINTED CIRCUIT BOARD LAYOUT (top view)ALPHA 8 CD PLAYER DAC PRINTED CIRCUIT BOARD LAYOUT (top view)

1 2 3 4 5 6 7 8
A
B
C
D
87654321
D
C
B
A
ISSUEDRAWING NO.
23425 DRAWING TITLE
DRAWN BY CHK BY DATE
Filename ECO No. DESCRIPTION OF CHANGE
J:\FILES\PCBS\CIRCUITS\L812C1_8.PRJ
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Cambridge CB5 9PB 1 4Sheet of
Alpha 7 CD Project Sheet
Circuit Diagram
L812CT 8
30-Oct-1997
LK1
LINK10NP
LK2
LINK10NP
LK3
LINK10NP
LK4
LINK10NP
LK5
LINK10NP
LK6
LINK10NP
LK7
LINK10NP
LK8
LINK10NP
LK9
LINK10NP
LK10
LINK10NP
LK11
LINK10NP
LK12
LINK10NP
LK13
LINK10NP
LK15
LINK10NP
LK16
LINK10NP
LK17
LINK10NP
LK18
LINK10NP
LK19
LINK10NP
LK20
LINK10NP
LK21
LINK10NP
LK22
LINK10NP
LK23
LINK10NP
LK24
LINK10NP
LK25
LINK10NP
LK26
LINK10NP
LK27
LINK10NP
LK28
LINK10NP
LK29
LINK10NP
LK30
LINK10NP
LK31
LINK10NP
LK32
LINK10NP
LK33
LINK10NP
LK34
LINK10NP
LK35
LINK10NP
LK36
LINK10NP
LK37
LINK10NP
LK38
LINK10NP
LK39
LINK10NP
LK40
LINK10NP
LK41
LINK10NP
LK42
LINK10NP
LK43
LINK10NP
LK44
LINK10NP
LK45
LINK10NP
LK46
LINK10NP
LK47
LINK10NP
LK48
LINK10NP
LK49
LINK10NP
LK50
LINK10NP
LK51
LINK10NP
LK52
LINK10NP
LK53
LINK10NP
LK54
LINK10NP
LK55
LINK10NP
LK56
LINK10NP
LK57
LINK10NP
LK58
LINK10NP
LK59
LINK10NP
LK60
LINK10NP
LK61
LINK10NP
LK62
LINK10NP
LK63
LINK10NP
LK64
LINK10NP
LK65
LINK10NP
LK67
LINK10NP
LK68
LINK10NP
LK69
LINK10NP
LK70
LINK10NP
LK71
LINK10NP
Detail
Drilling
DD
DRILL_DETAIL
Photo Strip
PS
PHOTO_STRIP
Update Box
A2
UPDATE_BOX
BARCODE LABEL
A1
BARCODE_A7CD
LK72
LINK10NP
LK73
LINK10NP
LK74
LINK10NP
LK75
LINK10NP
LK76
LINK10NP
LK77
LINK10NP
LK78
LINK10NP
LK79
LINK10NP
LK80
LINK10NP
LK81
LINK10NP
LK82
LINK10NP
LK83
LINK10NP
LK84
LINK10NP
LK85
LINK10NP
LK86
LINK10NP
LK87
LINK10NP
LK88
LINK10NP
LK89
LINK10NP
LDIN
LDOUT
INOUT
FILA
FILB
4MHZ
Power Supplies
L812C2_8.SCH
DAC & Audio outputs
L812C3_8.SCH
FILA
FILB
K0
K1
K0
K1
INOUT
LDIN
LDOUT
DEEM
SMUTE
AMUTE
4MHZ
RMIN
PGML
CLK
DATA
SCOR
SQCK
XRST
LDON
XLT
SENSE
SUBQ
Microcontroller & Display
L812C4_8.SCH
LK90
LINK10NP
LK91
LINK10NP
LK92
LINK10NP
LK93
LINK10NP
F4
T160MASP
TL1
TOOLING3.0 TL2 TOOLING4.1
BARCODE LABEL
A3
BARCODE_A8CD
FD_1
FIDUCIAL
FD_2
FIDUCIAL
LK96
LINK10NP
LK94
LINK10NP
LK95
LINK10NP
LK97
LINK10NP
VFD SUPPORT PAD
PAD1
ACD_VFD_PAD
TL3
TOOLING3.0 TL4 TOOLING3.0 TL5 TOOLING3.0
Links
Documentation
Tooling Holes & Alignment Marks
Spare Fuse
CAH 96_1039 C38 was 100U EL. LK14 removed & R64 added25 June 1996
CAH 96_1104 LK66 removed & R65 added20 Nov 1996
4
5
CAH 24-4-97 UPGRADE IMPROVEMENTS97_1037 6
CAH 97_1069 2-9-97 HDCD LED changed 7
CAH 97_1101 30-10-97 HDCD LED removed from Alpha 7 CD

1 2 3 4 5 6 7 8
A
B
C
D
87654321
D
C
B
A
ISSUEDRAWING NO.
23425 DRAWING TITLE
DRAWN BY CHK BY DATE
Filename ECO No. DESCRIPTION OF CHANGE
J:\FILES\PCBS\CIRCUITS\L812C2_8.SCH
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Cambridge CB5 9PB 2 4Sheet of
Alpha 7/8/9 CD Players
Circuit Diagram
L812CT 8
30-Oct-1997
L2
1U0H RADIAL
L3
1U0H RADIAL
F1
T160MA
D12
1N4003F +C34
100U EL 100V
+C36
3M3 EL
Vin
I
ADJ
A
Vout O
Z206 LM317T
+C37
10U EL
R38
330R MF
R41
1K6 MF
+C43
1M0 25V
+
C44
1M0 25V
+
C45
1M0 25V
D13
1N4003F
CDM14 Supply
+7.3V
Vin
I
ADJ
A
Vout O
Z207
LM317T
+C38
10U EL
R43
330R MF
R42
1K0 MF
D14
1N4003F
DAC Supply
+5V
+
C47
1M0 25V
+C48
1M0 25V
R44 3R3 FU
R45 3R3 FU
Vin
I
ADJ
A
Vout O
Z204
LM317T
Vin
I
ADJ A
Vout O
Z205
LM337T
+C39
100U EL
+C40
100U EL
R39
220R MF
R40
220R MF
R46
3K0 MF
R47
3K0 MF
D15 1N4003F
D16
1N4003F
R55
1K2 MF
1
2
3
4
5
SK205
8K2005
C55
10N CD
+
C41
100U EL
LOADOUT
LOADIN
GND
INSW
OUTSW
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23 SK204
FFC23V
LDIN
LDOUT
INOUT
P7V
FILA
FILB
Spare fuseSpare fuseSpare fuseSpare fuse
R50 100K MF
RA2
1
RA3
2
RTCC
3
MCLR
4
VSS
5
RB0 6
RB1 7
RB2 8
RB3 9
RB4 10
RB5 11
RB6 12
RB7 13
VDD
14
OSC2
15
OSC1
16
RA0
17
RA1
18
Z211
PIC16C54XT
RA0
AMUTE
DEEM
RB0
RB1
RB2
RB3
RB4
RB5
RB6
RB7
RMIN
3
2
1
+5V
O/P
GND Case
RX201
SBX1610-52
C52
10N CD
Vin
I
GND
G
Vout O
Z208 7805
+C42
100U EL
Vin
I
GND G
Vout O
Z209
7915
R51 22R FU
R52 22R FU
D17
15V 400MW +
C35
100U EL 100V
D18
7V5 400MW
R53
33K MF
Power connector to DAC PCB
R54 330R MF
P18V
N18V
P7V P5VP5V DAC
N30V
P11V
XRST
AC1
AC2
AC
AC
AC2
AC1
D22
1N4003F
D23
1N4003F
+C56
10U EL
1
2
3
4
LK101B
L814CA
1
2
3
4
LK101A
L814CA
P5V
HDCD
R58 10R FU
NL
SK1
IEC2
C46
10U NP
HS1
TO220HS30REG
4MHZ R59
330R MF
LIVE NEUT
P22VUN
N22VUN
N18V
P18V
P11V
P11VSW
P7V P5VDAC P5V
AGND
DGND
FILA
FILASW
LOADOUT
LOADININSW
OUTSW
REMOUT
HDCD
REMIN
P5VREM
HDCDREM
GNDREM
RLYV
N30V
ACAUD1
ACAUD2
ACAUDG
ACDIG1
ACDIG2
ACDIG3
FILAC
RB0
RB1
RB2
RB3
RB4
RB5
RB6
RB7
FILB
GND5VDAC
P5V
P5V
P5V DAC
N18V
P18V
P11V
R27 100K MF
P5V
NEUT2
115V
230V
GND
1
O/P 'In'
2 3
Bias
4
LoadIn
5
LoadOut
6
Vcc
7
Vcc
8 9
O/P 'Out'
10
Z210
LB1641
Motor Ground
C32
10N CD
D19
4V7 400MW
HS
HS2A
TO220HS08REG
N35V
R37 10R FU
R48
10R FU
+C33
1M0 25V
20
11
1
6
230V
115V
9
19
15
18
16
17
13
4
5
10
2
7
T201
L811TX
TP1
TP2TP3 TP4
TP5
TP6
TP7 RA0
+C53
22U EL OS
C54
10N CD
PD1
PAD300/4.1
L6
6U8H RADIAL
L7
6U8H RADIAL
115V units only
230V units only
F2
T250MA115V
!
!
!
!
!
!
!
!
!
+C51
1M0 25V
R64
10R FU
4 5 6
SW201B
A1014
7
8
9
SW201C
A1014
10 11 12
SW201D
A1014
R65 10R FU P11V CLK
!
!
RIV1
HP007 RIV2 HP007 +C49
100U EL
+C50
100U EL
D4
UF4003
D5
UF4003
D6
UF4003
D7
UF4003
D8
UF4003
D9
UF4003
D10
UF4003
D11
UF4003
HS3
TO220HS30REG
HS4TO220HS30REG
LED201
LED ULTRARED
CAH 96_1039 C38 was 100U EL. LK14 removed & R64 added25 June 1996
CAH 96_1104 LK66 removed & R65 added20 Nov 1996
4
5
CAH 24-4-97 UPGRADE IMPROVEMENTS97_1037 6
CAH 97_1069 2-9-97 HDCD LED changed 7
CAH 97_1101 30-10-97 HDCD LED removed from Alpha 7 CD
Alpha 8 only

1 2 3 4 5 6 7 8
A
B
C
D
87654321
D
C
B
A
ISSUEDRAWING NO.
23425 DRAWING TITLE
DRAWN BY CHK BY DATE
Filename ECO No. DESCRIPTION OF CHANGE
J:\FILES\PCBS\CIRCUITS\L812C3_8.SCH
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Cambridge CB5 9PB 3 4Sheet of
Alpha 7,8 & 9 CD Players
Circuit Diagram
L812CT 8
30-Oct-1997
LRCIN
1
DIN
2
BCKIN
3
CLKO
4
XTI
5
XTO
6
DGND
7
Vdd
8
Vcc2R
9
AGND2R
10
EXT1R
11
EXT2R
12
VOUTR
13
AGND
14 Vcc 15
VOUTL 16
EXT2L 17 EXT1L 18
AGND2L 19
Vcc2L 20
Vdd 21
DGND 22
CKSL 23
MODE 24
MUTE 25
MD/DM1 26 MC/DM2 27
ML/DSD 28
Z201
PCM1710U
3
21
Z1A
NJM2114 5
67
Z1B
NJM2114
84
Z1C
NJM2114
R2
3K9 MF
R3
3K9 MF
R4
3K9 MF
R5
10K MF
R6
10K MF
R7
33K MF
C2
680P PP
C3
680P PP R8
3K9 MF
R9
3K9 MF
C4
10U NP R10
22K MF
R11
120R MF
R12
22R MF
Q1
BC547B
R13
10K MF
C5
100P PP
3
21
Z101A
NJM2114 5
67
Z101B
NJM2114
R102
3K9 MF
R103
3K9 MF
R104
3K9 MF
R105
10K MF
R106
10K MF
R107
33K MF
C102
680P PP
C103
680P PP R108
3K9 MF
R109
3K9 MF
C104
10U NP
R110
22K MF
R111
120R MF
R112
22R MF
Q101
BC547B
R113
10K MF
C105
100P PP
Vin
I
GND
G
Vout O
Z203
78L05
X1
16.9344MHZ
C13
33P CD
R18
33K MF
R19
33K MF
C15
100P CD
C16
100P CD R21
470R MF
Q2
BC547B
C17
10N CD
C10
1N0 CD
+
C22
100U EL
+
C23
100U EL
+
C24
100U EL
C12
10N CD
R23
120R
R24
10R FU
Analogue ground
84
Z101C
NJM2114
12
Z202A 74HCU04
34
Z202B 74HCU04
56
Z202C 74HCU04
8 9
Z202D
74HCU04
10 11
Z202E 74HCU04
1213
Z202F
74HCU04
14
7
Z202G
74HCU04
+C26
100U EL
R25
120R MF
N18V
P18V C6
680P PP
C7
680P PP
L1
7F003
Analogue Ground
Analogue Ground
R26
100K MF
Q3
BC557B
R14
10K MF
R15
10K MF
N18V
SH1 EMCPHONO2
GFS
FOK
WDCK
LRCK
BCLK
ADATA
R35
4M7 MF
ADATA
BCLK
LRCK
17MHZ
17MHZ
DATA
CLK
PGML CLK DATA
SUBQ
SENSE
XLT
LDON
DIGOUT
XRST
AMUTE
SQCK
SCOR
5
4
1
2
3
SCRN
T202
DIGOUT_TX
R22
220R MF
R36
620R MF
C14
33P CD
C18 10N CD C19
10N CD
DIGOUT
P5V
P7V
Flex connector from CDM14 mech
SMUTE
P5V DAC
Data connector to DAC PCB
R31 330R MF R32 330R MF R33 330R MF
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
SK203
FFC32V
HDCD RB3 17MHZ WD LRCK ADATA BCLK AMUTE XRST DIGOUT DEEM SMUTE RA0 RB7 RB6 RB5 RB4 RB0 RB1 RB2
C101
NOT FITTED
C1
NOT FITTED
1
EMC
SK4 PHONO2H
EMC
SK5
PHONO1
D1
1N4148
D2
1N4148
XRST
R20
22R MF
D3 1N4148
R17
10K MF
P5V
SCLK
12 34 56 78 910 1112 1314 1516
PL1
DIL16 VPLG
P5V DAC(A7)
P5V DAC(A7)
P11V CLK
D21
1N4148
PMUTE
PMUTE
L4
33UH AX
L5
33UH AX
R56
330R MF
R57
330R MF
XRST
PMUTE
VOUTL
LEFT1 LOUT
ROUT
RIGHT1
VOUTR
GNDOUT
ADATA
LRCK
BCLK
WDCK 17MHZ
DIGOUT
P5VCLK
AUDGND
DACGND
DIGOUTP
DIGOUTN
A7DAC5V
R16 330R MF
WD L
R
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
SK2
DIL16 HSKT
Alpha 7 CD Configuration Plug
+C29
100U EL
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
SK201
FFC23V
+
C27
10U EL
Q4
BC547B
D20
4V7 400MW
P18V
R29
1K0 MF
R30
10K MF
Q5
BC547B
R28
10K MF
Q6
BC547B
R34
10K MF
P5V
TP13
Mute
TP11
17MHz
TP8
TP9
TP10
LRCK
ADATA
BCLK
TP14
C21
10U NP
+
C25
22U EL OS
R49
120R MF
R62
330R MF
!
C20
680P PP
1
2
3
SW201A
A1014
C28
1N0 PP
C11
680P PP
CAH 96_1039 C38 was 100U EL. LK14 removed & R64 added25 June 1996
CAH 96_1104 LK66 removed & R65 added20 Nov 1996
4
5
CAH 24-4-97 UPGRADE IMPROVEMENTS97_1037 6
CAH 97_1069 2-9-97 HDCD LED changed 7
CAH 97_1101 30-10-97 HDCD LED removed from Alpha 7 CD

1 2 3 4 5 6 7 8
A
B
C
D
87654321
D
C
B
A
ISSUEDRAWING NO.
23425 DRAWING TITLE
DRAWN BY CHK BY DATE
Filename ECO No. DESCRIPTION OF CHANGE
J:\FILES\PCBS\CIRCUITS\L812C4_8.SCH
A & R Cambridge Ltd.
Pembroke Avenue
Denny Industrial Centre
Waterbeach
Cambridge CB5 9PB 4 4Sheet of
Alpha 7,8 & 9 CD Players
Circuit Diagram
L812CT 8
30-Oct-1997
TIMER
1
RMIN
2
+5V
3
NC
4
NC
5
M/C
6
POML
7
CLK
8
SENSE
9
DATA
10
SQCK
11
SUBQ
12
NC
13
AMUTE
14
LDON
15
XLT
16
NC
17
R11
18
R12
19
R13
20
R14
21
KEY0
22
KEY1
23
KEY2
24
KEY3 25
+5V 26
+5V 27
AF ADJ 28
IN/OUTSW 29
RST 30
EXTAL 31
XTAL 32
VSS 33
RO1 34
RO2 35
RO3 36
RO4 37
DEEM 38
NC 39
SMUTE 40
NC 41 NC 42
P1 43 P2 44 P3 45 P4 46 P5 47 P6 48 P7 49 P8 50 P9 51
P10 52 P11 53 P12 54 P13 55 P14 56 P15 57
NC 58 NC 59 NC 60 NC 61 NC 62
10 63 20 64
30
65
40
66
50
67
60
68
70
69
80
70
-30v
71
+5V
72
+5V
73
+5V
74
+5V
75
LOADIN
76
LOADOUT
77
SCOR
78
SEL2
79
SEL1
80
Z212
CXP826P16Q
VF
1
VF
2 3
80
4
P15
5
P14
6
P13
7 8
P12
9
70
10
P11
11
60
12
P10
13
P9
14
50
15
P8
16
40
17
P7
18
P6
19 20
P5
21
30
22
P4
23
20
24
P3
25
P2
26
10
27
P1
28 29
-88.8888 88
VF
30
VF
31
DISC
SHUFFLE
> ||
DISP301
B1008
30
40
50
60
70
80
+
C292
100U EL
C291
47N CD C293 47N CD
X201
CST4.00
C294
47N CD
R295
10K MF
R296
10K MF R297 10K MF
R298
10K MF
R292
8K2 MF
R293 8K2 MF
R294 1K0 MF
D291
1N4148
D292
1N4148
D293
1N4148
D294
1N4148
D295
1N4148
D296
1N4148
D297
1N4148
R1
R2
R3
R4
R1
R2
R3
R4
C0' C1' C3'
C4'
C0
C2
C7
R308
8K2 MF
R313
8K2 MF
R307
1K2 MF
R312
1K2 MF
R306
1K5 MF
R311
1K5 MF
R305
2K2 MF
R310
2K2 MF
R304
3K3 MF
R309
3K3 MF
R303
5K6 MF
R302
12K MF
R301
33K MF
NEXT PREV FF FR PAUSE STOP PLAY OPEN
R11
R12
R13
R14
INOUT
DEEM
SMUTE
XRST
CHECK PROGRAM DISPLAY REPEAT
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
SK301
FFC32H
Display PCB
4MHZ
R291 3R3 FU
SW301 SW302 SW303 SW304 SW305 SW306 SW307 SW308
SW309 SW310 SW311 SW312
FILA FILB
Flexfoil connector to Display PCB
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
SK291
FFC32V P5V
K0
K1
K0
K1
R314
220R MF
P5V
N30V
INOUT
LDIN
LDOUT
DEEM
SMUTE
AMUTE
4MHZ
RMIN
PGML
CLK
DATA
SCOR
SQCK
XRST
LDON
XLT
SENSE
SUBQ
P1 P3 P4 P6 P8 P9 P10 P12 P14 P15 20 40 50 60 70 P2 P5 P7 P11 P13 10 30 80
20 10
P15 P1 P2 P3 P4 P5 P6 P7 P8 P9 P10 P11 P12 P13 P14
R11
R12 R13 R14
XLT LDON AMUTE SUBQ SQCK DATA SENSE CLK PGML LDIN LDOUT SCOR RMIN
INOUT
LDIN
LDOUT
DEEM
SMUTE
AMUTE
4MHZ
RMIN
PGML
CLK
DATA
SCOR
SQCK
XRST
LDON
XLT
SENSE
SUBQ
NEXT PLAY
OPEN
PREV FF FR PAUSE STOP
CHECK PROG DISP REPEAT
VF2 VF1
DISGND
DIS5V
K0
K1
SMUTE
PGML CLK DATA
DEEM
RMIN
4MHZ
D80
D70 D60 D50 D40 D30 D20 D10 DP1 DP2 DP3 DP4 DP5 DP6 DP7 DP8 DP9 DP10 DP11 DP12 DP13 DP14 DP15
D80 D70 D60 D50 D40 D30 D20 D10 DP1 DP2 DP3 DP4 DP5 DP6 DP7 DP8 DP9 DP10 DP11 DP12 DP13 DP14 DP15
R60
8K2 MF
R61
8K2 MF
AMUTE
K0M
K1M
DEEM
TP12
LED301
LED GREEN
R63
33K MF
!
CAH 96_1039 C38 was 100U EL. LK14 removed & R64 added25 June 1996
CAH 96_1104 LK66 removed & R65 added20 Nov 1996
4
5
CAH 24-4-97 UPGRADE IMPROVEMENTS97_1037 6
CAH 97_1069 2-9-97 HDCD LED changed 7
CAH 97_1101 30-10-97 HDCD LED removed from Alpha 7 CD