Personics/Sony CDK-006 CD Changer Restoration
Introduction
In 1995, a large number of Personics-modified Sony CDK-006 CD changers
became available on the surplus market. Personics used these units
along with special encrypted discs in a point-of-sale high-speed
dubbing system.
The Personics modifications made the CDK-006 run at several times faster
than the normal speed, and added a proprietary digital output.
Unfortunately neither of these changes are of any benefit to those who
wish to use these for normal audio discs.
With a small number of replacement parts, a skilled electronics
technician can restore one of these units to Sony factory spec, allowing
it to be used for normal audio. For instance, a restored player can be
used in a Seeburg jukebox.
Notes
The procedure described calls for the use of a "servo measurement
adapter" and an "events counter probe". I do not know of any source for
these test fixtures. They may be standard Sony test fixtures used for
many CD players. The CDK-006 service manual only gives a simplified
servo adjustment procedure that does not rely on a servo measurement
adapter.
For the Rev. 17 main board, the crystal frequency specified (8.4672)
must be EXACT (to within normal crystal tolerances,
i.e., ± 30 PPM). A frequency that is merely "close" is not good
enough. In my experience this crystal frequency is not commonly
available as a stock item from most electronics distributers such as
Digikey and Mouser. However, it is used in many CD players and even
some DVD players, so you may be able to salvage a suitable crystal from
a discarded player.
Warnings and Disclaimer
The Sony BU-1B optical pickup assembly is very
STATIC SENSITIVE. Proper antistatic handling procedures
MUST be used to avoid irreparable damage.
This modification information is provided with NO
WARRANTY. Any modifications you may make to your CD changers
are entirely at YOUR OWN RISK.
If you do not have experience with proper antistatic handling procedures
and surface mount soldering, do not attempt this modification, as you
are likely to damage your CD changer.
Parts list
Ref #
| Personics
| Sony
|
---|
part # | description
| part # | description
|
C101 | 32011 | 2200 pF
| 1-161-377-00 | Ceramic 4700 pF 10% 16V
|
C107 | 32013 | 0.012 uF
| 1-136-159-00 | Film 0.033 uF 5% 50V
|
C615 | 32021 | 22 pF
| 1-102-964-00 | Ceramic 36 pF 5% 50V
|
C616 | 32034 | 100 pF
| 1-102-976-00 | Ceramic 180 pF 5% 50V
|
R536 | 27023 | 25 turn 50 Kohm pot
| 1-247-864-11 | Carbon 24K 5% 1/4W
|
RV602 | 27022 | 5 Kohm pot
| 1-226-772-11 | 4.7 Kohm pot
|
T601 | 36001 | 1.5 uH
| 1-426-212-11 | 5.6 uH coil (RF)
|
X601 | unknown
| 1-567-301-21 | crystal 8.4672 MHz
|
none | 45002 | 1N914 diode, paralleled with C601
| remove
|
none | 24440 | 374 Kohm resistor, paralleled with R601
| remove
|
Note: X601 is only needed for Rev. 17 main boards. Prior revisions (12,
13, & 16) need only to have the jumper wire replaced near C326 and
the legend "8.4672 MHz".
Procedure
- Component Conversion
- Remove BNC connector and attached coax cable
- Remove DE9 connector and attached ribbon cable
- Remove Personics digital output circuit board
- Remove Personics rev sticker from back of unit and note revision letter
- Remove cable ties as necessary
- Remove screws holding main board down
- Check that screws mounting heat sink are secure and tight
- Desolder all Personics digital output wires from main PC board
- seven wire ribbon cable
- two wire cable from TP9 & C2F1
- Turn A.C. receptacle 180 degrees clockwise
- Replace T601 with 5.6 uH adjustable RF coil - Sony #1-426-212-11
- Repair T601 PCB trace if it has been cut
- Remove 50K trip pot R536 and replace with 24K 5% 1/4W resistor (R536)
- Remove piggyback resistor and diode at C601 & R601 on trace side
of PCB, check R601 = 220K
- Replace C615 with 36 pF capacitor
- Replace C616 with 180 pF capacitor
- Replace Hitachi OFC dual audio output cable from CNJ210 to CNP210
- Board suffix 12, 13 & 16 only:
- Replace jumper wire near CNP501 and the legend "8.4672 MHz"
- Board suffix 17 only:
- At DSP chip IC601, remove jumper from pins 56, 57 & 59 and
carefully reconnect pins to traces
- Replace X601 with 8.4672 MHz crystal on main board
- Sony #1-567-301-21
- Cut off Molex connector from red and blue wires
- Reconnect red striped wire to CNP610
- Reconnect blue striped wire to CNP709
- Optical Block Assembly BU-1B
- Remove screw securing black ground wire connected to RF board on BU-1B
- Carefully remove BU-1B optical block and place on anti-static mat
(ensure lens touches nothing)
- Replace C101 with 4700 pF capacitor
- Replace C107 with 0.033 uF capacitor
- Add FLOIL lubricant as specified to BU-1B
- Carefully clean laser lens with lens cleaner solution and lens tissue
- Reinstall optical unit
- Reconnect ground wire
- Electrical Alignment
- Plug in unit and let it warm up and stabilize for 15 minutes
- DC Balance
- Put into "adjustment mode": short test point TP702 adjustment
pin (ADJ) to ground pin (G)
- Turn power switch (S756) (resets microcontroller)
- Disconnect CNP302
- Connect DMM to main board test point TP16 VCO SET
- Adjust main board RV602 (20 turn pot) so that reading on DMM is
0VDC ± 5 mV
- Clock Frequency
- With CNP302 disconnected:
- Connect frequency counter to main board test point TP7 PCLK
- Adjust main board T601 so that reading on frequency counter is
4.3218 MHz ± 5 KHz
- Reconnect CNP302
- Check Iop (laser output current)
- Measure voltage across R003 (22 ohms) on upper RF board with
DMM test leads (+ [R003] -)
- Calculate target Iop voltage V = Iop * 22
(current value Iop written on BU-1B)
- Play YEDS-1 CD
- Adjust RV001 (near top of RF board) for the target voltage
calculated above +- 100 mV (5 mA)
- Check DC offset on BU-1B (tracking balance)
- Remove red wire loop jumper at CNP101 and connect servo
measurement adapter
- Set servo measurement adapter FOCUS/TRACKING switch to OFF
- Set TRACKING switch on servo measurement adapter to OPEN
- Connect oscilloscope 10X probe to TP1 (near center of main board
next to CNP101)
- Play YEDS-1 CD
- Adjust RV101 (near center of RF board) for a symmetrical trace
around 0 volts DC
- Switch scope between AC and DC coupling several times, observe
no change
- Check Focus Bias (Eye Pattern)
- Set switches on servo measurement adapter to (CLOSED-CLOSED-OFF)
- Connect oscilloscope 10X probe to TP102 on RF board and ground
probe to chassis ground near ???
- Set scope sweep speed (X axis) to 0.2 us/division
- Play center track of YEDS-1 disc
- Adjust RV102 (near bottom of RF board) for highest amplitude of
first cycle of eye pattern waveform
- Check P-P value of RF signal (Eye Pattern) - about 1V P-P
- Check again Iop and adjust if necessary
- Focus Servo
- Connect oscillator to servo measurement adapter and set to
1.2 KHz @ 100 mV RMS
- Set switches on servo measurement adapter to (CLOSED-CLOSED-FOCUS)
- Play Sony test CD YEDS-1, track 7
- Adjust RV502 focus gain (near center of main board) gain = 0 dBu
± 0.5 dB (both channels equal)
- Check that phase @ 1200 Hz is 20-60 degrees (NOTE: increase
oscillator output to 200 mV RMS)
- Tracking Servo
- Set oscillator frequency to 1.5 KHz @ 100 mV RMS
- Set switches on servo measurement adapter to (CLOSED-CLOSED-TRACKING)
- Play Sony test CD YEDS-1, track 7
- Adjust RV501 tracking gain (near center of main board)
gain = 0 dBu ± 0.5 dB (both channels equal)
- Check that phase @ 1500 Hz is 20-60 degrees (NOT: increase
oscillator output to 400 mV RMS)
- Final Check
- Reconfirm the following:
- Check and adjust the PLL free-run frequency (T601)
- Check and adjust tracking balance (RV101, center of RF board)
- Check and adjust the focus bias (eye pattern, RV102, bottom of
RF board)
- Check and adjust the focus servo gain (RV502, center of main
board)
- Chekc and adjust the tracking servo gain (RV501, center of main
board)
- Remove Servo Test Fixture interface from CNP101 and reinstall jumper
(2 red wire loops)
- Remove jumper at TP702 to take out of adjust mode
- Press power switch to reset unit
- Connect events counter probe to C2F2 flag and monitor error count
- Play YEDS-1 disc from beginning and take care not to bump unit,
verify error count <= 1
- Reassemble and pack
- Stop disc, wait for chucking arm to return disc to slot
- Open door and disconnect power
- Remove any test leads, scope probes, and remove all discs
- Apply lacquer to all trimmers to lock settings (6 places)
- Reassemble unit and replace all screws
- Place stickers on back of unit, board suffix #, mod & calibration
date & initial
- Install 5 shipping screws and lock down optical block