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Marantz CD67OSE modifications
Power supply
Part: Org. value: Replace by: Brand: Farnell: Remark:
C803/804 470u/35V 6800u/35V Panasonic +100n PPS
C805/806 470u/16V 2200u/25V Elna RSH +100n X7R
C813 4700u/16V 4700u/16V Elna RSH +100n PPS
C815 3300u/6,3V 4700u/16V Elna RSH +100n X7R
D801...804 S5688G 11DQ10 IR schottky
D811/812 S5688G 11DQ10 IR schottky
DN01/02 S5688G 11DQ10 IR schottky
Q801/802 78M12/79M12 LM317/LM337 * see below
Q811 7805 LM340AT-5,0 NSC 412-703
Q871 7805 LM340AT-5,0 NSC 412-703
HDAM & OPAMPS (Q605/606)
C611...614 100u/25V leave in place Elna Cerafine! +100n PPS
C651...654 # 470u/16V 470u/35V Elna RSH +100n PPS
C655...658 220u/16V (wire jumper) Elna Silmic! measure offset first!
C659/660 100p remove
R613...616 27R 1mH/14R Siemens 608-609
R651...654 # 27R 1mH/14R Siemens 608-609 # optional, see below
R655/656 10k remove
R657/658 100R wire jumper
R659/660 100R 47R
Q605/606 ** NJM2114D AD827/LM6172/LT1361.... experiment! ** see below
- insert extra 220n/PPS between pins 4 and 8 Panasonic 383-5492 SMD
OUTPUT FILTER
C601...604 120p 120p/1% Mica 867-901
C605/606 1000p 470p/1% PS Styroflex 304-0021 Bessel filter
C607/608 100p 100p/1% PS Styroflex 303-9894
CD21...24 120p 120p/1% Mica 867-901
R601...604 27k 26k7/0,1% Welwyn 340-546
R607/608 18k 18k2/0,1% Welwyn 340-388
R609/610 22k 22k1/0,1% Welwyn 340-467
R605/606/611/612 10k 10k/0,1% Welwyn 340-133
RD21...28 10k 10k/0,1% Welwyn 340-133
DAC (QD01, SM5872BS)
CD04 220u/10V 220u/35V Elna RSH +100n PPS
CD05 47n cer. 100n PPS Panasonic 383-5418
CD06 47n cer. 100n PPS Panasonic 383-5418 SMD
CD07 220u/10V 220u/35V Elna RSH +100n PPS
CD12/13 47n cer. 100n PPS Panasonic 383-5418 SMD
CD15/16 470u/10V 470u/35V Elna RSH
RD01/04 4,7R 470uH/2,5R Siemens 517-070 +2 ferrites
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Decoder (Q102, SAA7372GP)
C108 100n cer. 100n MKP
C109 22n cer. 22n MKP
C114/120 47u/16V 100u/16V Elna RSH
C115...119 47n cer. 100n PPS Panasonic 383-5418 SMD
C125 1n cer. 1n MKP
R117/118 4,7R 470uH/2,5R Siemens 517-070 +2 ferrites
Drivers (Q106/107/108, TDA7073A)
C156 47u/16V 100u/16V Elna RSH
C132/157/159 47n cer. 100n X7R Siemens
- on bottom-side, directly between pin 5 and ground.
µCONTROLLER (QF01, MN187164)
CF02 47u/16V remove
CF01 47n cer. 100u/16V Elna RSH +100n X7R
RF01 4,7R 470uH/2,5R Siemens 517-070 +2 ferrites
RY11 4,7R 470uH/2,5R. Siemens 517-070 +2 ferrites
+100n X7R
SERVO PCB
C126 47u/16V 100u/16V Elna RSH +100n X7R
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MORE MOD'S...
- Disable headphone circuit: remove C901/902 (signal) and jumpers U139/140 (+/- 12V)
- Disable muting circuit: remove QN05...08, QN24/25/91/92 and RN27/28 (disables analog -12V to muting
circuit).
- Drive new muting relays: replace RN30/31 with 2k2, tap power from collector of QN02 (approx. 12V=),
jumper base and collector pins of QN24/25 and use muting-lines to drive BC547's with relays.
- Replace clock by special low jitter clock module and connect to pin 28 of DAC.
- Insert separate 5V voltage regulators (LM317 based) for analog and digital VDD pins of DAC and clock
circuit. Remove U203 and replace RD04 and CD07 to obtain separate connection for analog +5V of DAC.
- Replace fixed powerchord by IEC socket and connect ground wire to chassis at the output socket.
Use high quality steel braid shielded power cable to connect player to mains.
- Place varistor S20K250 directly on mains pins of IEC socket or on mains terminals on PCB.
- Insert common-mode filter (Farnell 353-2331). Remove U243/245 and insert filter instead.
Place two class X or Y capacitors 4,7n/250Vac across mains before and after filter.
REMARKS
- * replace Q801/802 with LM317/337 on small PCB's. Use expermentingboard or PCB's found at
http://eddie.dyec.com.tw/diy-products/vrm/vrm.htm for example. Fit LM337's by carefully cross-bending the
input and output pins and reversing the diodes and caps. Use tantalum decoupling caps.
- ** for best results: use single opamps, each fit for their task. Example: OPA602 + THS4011 or
AD8610 + AD8510 for post-DAC + filter on SMD adapters (BrownDog or eq.). Experiment and listen!
- # the HDAM-circuit looks nice, but when moving up to better opamps and interconnects this circuit starts to
interfere and degrades sound quality. To disable HDAM: remove R651...654 (+/- 12V), R617/618 and
RH23/24. Insert wire jumper at R619/620.
A lot of information and tips came from various articles and forums I found on the internet:
- many thanks to Thorsten Loesch for his article at http://www.tnt-audio.com/clinica/cd67.html
- and credits to the members of diyAudio.com that contributed through the forum, allthough they are probably
not aware of that (they'll know who they are if they recognize their idea here...).
22-03-2005, data collected by R.A. van der Steen
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