Service Manuals, User Guides, Schematic Diagrams or docs for : ARCAM CD92 Arcam-CD-92-Service-Manual

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Service Manual CD72/92
Issue 1.0

DiVA CD72, CD92
Compact Disc Player

ARCAM
Contents List

! Contents list

! Circuit description

! Upgrade procedure

! Service guide

! Circuit diagrams

! Component overlays

! Circuit board parts list

! General assembly parts list
The keyboard scanning works by connecting the keys to a
CD72/CD92 Circuit Description resistor ladder on an ADC input to the micro. Pressing a key
presents a unique voltage to this input.

The remote control data contains a `Customer Code' that
SUMMARY identifies this as an Arcam product. The diode network D291 to
D297 configures the micro to accept this code.
The Main PCB for the DiVA CD72/92 player may be built as
two different versions:

! With all components fitted for the Alpha CD72
Motor Driver
(L887RS)
The status of the drawer is indicated to the micro by two micro
! With audio components and connectors omitted, for
switches `INSW' and `OUTSW' on SK205. The micro controls
use as a motherboard for plug-in DAC module L816
the drawer motor via driver Z210.
(L888RS) for CD92

The CD72 version may be converted for use with a upgrade
plug-in DAC board by removing a configuration connector. DAC & System Clock

The system is based on a Sony kit, comprising CDM14-5BD10 The DAC is a Burr Brown PCM1716. Mute, attenuation and de-
laser mechanism & loader, micro-controller and fluorescent emphasis functions can be controlled via a 3-wire serial link
display. from the system micro to pins 26, 27 & 28 via resistors R31 R32
& R33 respectively. Currently resistors R31 to R33 are not
The PCM 1716, as per the 1710, can be operated in either fitted and the DAC is configured for hardware control.
Software or Hardware mode. The default for the CD72 is
hardware mode. Digital audio is input on pins 1, 2 & 3 in standard Sony format,
i.e. Word Clock, Bit Clock and Data.

The system clock is based around 16.9344 MHZ crystal X1 and
Power Supplies & Reset/Mute transistor Q2. This produces a stable clock with low jitter.
Z202E & D provide amplification and buffering to the DAC.
Selection for 230V or 115V mains operation is made by
inserting a fuse into the appropriate position. The mains
transformer has three secondary windings:
Analogue Filters
1. Provides +12V and -12V supplies for the audio
output circuitry via regulators Z204 and Z205. Z1A (& Z101A) provides the basis for a 2-pole filter. Z1B (&
Z101B) buffer the audio and set the output level.
2. This produces the digital, motor drive and
fluorescent display grid supplies: Digital Output
+7.3V (Z206) Mechanism and motor driver supply An SPDIF format digital output signal is generated by the
+5V (Z208) General digital logic supply decoder on the mechanism assembly. This is passed through
+5V (Z207) Supply to DAC isolating transformer T202 to a single phono socket SK5.
+5V (Z203) Supply to system clock generator Optical digital output via Z2 is also tapped off the digital output
-30V (Z209) Display grid voltage. signal. Power is supplied to Z2 via Z3 a 78L05 regulator.

3. Provides an AC supply for the display filament. Upgrade to CD92
The power-on reset signal XRST is generated by R17 and C29. The CD72 includes a configuration PCB connected to PL1. This
When the power switch is turned off one of its poles discharges provides power to the DAC and clock generator, connects the
C29 quickly. This, along with the AMUTE signal from the digital audio and system clock signals to the DAC and provides
micro, controls the output mute transistors via level shifter Q3. additional clock buffering with Z4 A&B .

Removing this board removes these connections and allows the
Remote Control/PIC Micro system clock generated on the DAC board to pass through to the
CDM14.
The PIC micro controller converts the RC-5 format data into the
NEC format required by the Sony micro. The PIC also controls
the configuration of the digital filter/DAC on the DAC board.

Micro controller & Display Board
The system micro controller Z212 has the following functions:

! Control of the mechanism & decoder on the CDM14
! Control of mute, attenuation and deemphasis for the
DAC
! Direct drive of the fluorescent display
! Remote control decoding
! Keyboard scanning
Upgrading a CD72 to CD92
1. Disconnect the mains supply from the DiVA CD player.
2. Remove the top cover by taking out the 2 screws from the top edge of the rear
panel (marked 1) and on each side (marked 2).
3. Pull off the sticky plastic gasket between the digital output socket and the
audio output sockets to reveal the 4 audio output socket holes through which
the DAC board sockets will pass.
4. Any remnants of adhesive can be removed by rubbing it gently with your
finger and rolling it off. We do not recommend the use of solvents.
5. Fit the 2 supplied PCB (printed circuit board) pillars to the holes in the main
board on either side of the flexfoil coming from the display board. These are
marked 3 on the drawing overleaf. The big end of the PCB pillars goes into
the main PCB. These push in and clip home. Take great care not to damage
the main circuit board.
6. Remove the Configuration Module (the small vertically mounted PCB in the
centre of the main board). It will not be needed once the new DAC board is
fitted.
7. Note: The original nickel plated audio output sockets are no longer connected
after the upgrade and cannot be used. However the digital output still
functions.
8. Remove the following jumpers :- PL2, PL3, PL4, PL6. Fit the following
jumpers :- PL5, PL7.
9. Fit the magnetic shielding plate, by peeling off one side of (E923MC the
adhesive pad) and stick to (E922MC the shielding plate). Then peel the
backing off the other side of pad & Align the top edge with the top of the
transformer and fit centrally. It MUST align with the top edge of the
transformer, if it is fitted to low to the board it may cause shorting.

10. Take static precautions first. With the aluminium extrusion of the DAC
module uppermost fit the flexfoils from the module in to the appropriate
sockets in the main board, ensuring they are pushed fully home. If they are
not pushed fully home, the unit may not read discs. You may find it helps to
slide the module into the unit so that the audio output sockets fit through the
holes in the rear panel and angle the module slightly upwards to achieve this.

11. Push the module down firmly on to the support pillars.

12. Fit the supplied screws with integral washers to the 3 points marked 4 on the
drawing overleaf to secure the module in place. The 2 slightly shorter screws
and the shake proof washers should be fitted to the 2 points marked 6.

13. Refit the top cover, connect the unit to live mains and switch on. Press load to
allow the tray to come fully out and then remove the mains lead from the unit.
Remove the draw front and fit the new draw front with the CD92 / HDCD
logo on.

14. Check the unit functions correctly and if you have an HDCD disc check that a
red glow is seen behind the display window when it is playing.
Upgrading a CD72 ( TEXT ) to CD92 ( TEXT )
1. Disconnect the mains supply from the DiVA CD player.

2. Remove the top cover by taking out the 2 screws from the top edge of the rear
panel (marked 1) and on each side (marked 2).

3. Pull off the sticky plastic gasket between the digital output socket and the
audio output sockets to reveal the 4 audio output socket holes through which
the DAC board sockets will pass.

4. Any remnants of adhesive can be removed by rubbing it gently with your
finger and rolling it off. We do not recommend the use of solvents.

5. Fit the 2 supplied PCB (printed circuit board) pillars to the holes in the main
board on either side of the flexfoil coming from the display board. These are
marked 3 on the drawing overleaf. The big end of the PCB pillars goes into
the main PCB. These push in and clip home. Take great care not to damage
the main circuit board.

6. Note: The original nickel plated audio output sockets are no longer connected
after the upgrade and cannot be used. However the digital output still
functions.

7. Set the main board jumper settings as listed below :-

PL200 ON
PL201 ON
PL202 ON
PL203 OFF
PL204 ON
PL205 OFF
PL300 2 and 3
PL400 OFF
PL401 OFF
PL402 OFF

8. Fit the magnetic shielding plate ( part no E922MC ) to the adhesive pad ( part
no E923MC).
Peel the backing off the other side of the mains transformer. Align the top
edge with the top of the transformer and fit centrally.

9. Take static precautions first. With the aluminium extrusion of the DAC
module uppermost fit the flexfoils from the module in to the appropriate
sockets in the main board, ensuring they are pushed fully home. If they are
not pushed fully home, the unit may not read discs. You may find it helps to
slide the module into the unit so that the audio output sockets fit through the
holes in the rear panel and angle the module slightly upwards to achieve this.
10. Push the module down firmly on to the support pillars.

11. Fit the supplied screws with integral washers to the 3 points marked 4 on the
drawing overleaf to secure the module in place. The 2 slightly shorter screws
and the shake proof washers should be fitted to the 2 points marked 6.

12. Refit the top cover, connect the unit to live mains and switch on. Press load to
allow the tray to come fully out and then remove the mains lead from the unit.
Remove the draw front and fit the new draw front with the CD92 / HDCD
logo on.

13. Check the unit functions correctly and if you have an HDCD disc check that a
red glow is seen behind the display window when it is playing

2 2

4 6
CD72 / CD92 Service Guide

Fault diagnostics

Fault Action
No power Check mains fuse
Check power supply rails
No Audio output Check for digital output, if ok then
check power supply voltages
Check DAC chip
Intermittent noise on output Check Dac chip
Fails to respond to commands Check supply to remote circuit
Check remote flex foil cable
Check for +4.9volts on RX201 o/p
Fails to read disc Check mech supply
Check clock signal
Laser optic moves to end stop Caused by failure of clock signal to
position the mech
Check mech supply
Check clock signal
No Display Check filament voltage 3.1vac
Check flex foil cable
Check for dry joints on micro and
display
Spurious display readout Check for dry joints on display board

Power supply test points

Position Voltage
DGND 0 volts
PL6 +12 volts
PL3 -12 volts
R65 +11 volts
Z206 o/p +7.3 volts - mech supply
Z207 o/p +5 volts - DAC supply
Z208 o/p +5 volts
Z209 o/p -30 volts
SK291 across pins 1 and 32 3.1 volts AC

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