I've recapped the power supply board, replaced the 56nF in the feedback loop with 100nF wima mkt, checked the HF cable from the CD board to the Decoder board. replaced 4.7 mf bipolar on decoder board with 10mf , replaced all the logic caps on analog board. Resoldered some of the transistors and connectors...
still nothing, In fact I thnk I've made it worse, it powers up and the display sometimes lights all up and sometimes nothing at all, the laser arm sometimes moves out and sometimes in, and the motor sometimes spins fast and sometimes not at all. if I press play, sometimes, the focusing arm will move as it should and try to focus, but then the disc error appears...
I'm guessing there are some bad IC's or transistors, but I don't know how to narrow down the problem, since it's all over the place...
still nothing, In fact I thnk I've made it worse, it powers up and the display sometimes lights all up and sometimes nothing at all, the laser arm sometimes moves out and sometimes in, and the motor sometimes spins fast and sometimes not at all. if I press play, sometimes, the focusing arm will move as it should and try to focus, but then the disc error appears...
I'm guessing there are some bad IC's or transistors, but I don't know how to narrow down the problem, since it's all over the place...
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well, yeah, these players can be bitches. Let it rest for half a year, then start over again. 'at times you oversee the simplest faults. Of course it's of great help to have a second working player.
Yeah, that's what I was thinking.. I thought I can maybe fix it because there's a lot of info on the net on these players, and people seem to get them going but I guess it all depends on the condition. Finding a semi-working one would probably be smarter. Anyway, thanks to all of you who helped.
I'm currently working on a 304 silver that drives me crazy, everything works for like ~60min, power supply gets hot like hell, then the 7924 dies, and originally would take the 7918 with it. I've done that game now 2 times... luckily I was able to borrow a FLIR this weekend hoping to find the cause (most likely on the display board)...
I've gone more or less the same route like you, fixing all the obvious stuff didn't help at first, because there are so many parts that can go wrong in these units. But nevertheless, don't give up, once they are playing stable, they are wonderful CD players that have some very unique features. Never would I trade them for anything from a Japanese company (Sony, TEAC, etc.)
I have one perfectly working 304 (transplanted CDM0, originally CDM1), the mentioned silver 304 (CDM1) and a CD204 (CDM0), a very weird combination of CD104, CD304 and unique servo and decoder board layout (no SMD), that also is waiting to be fixed.
The later CDM4 players I have are rock solid compared to CDM0, CDM1 and CDM2.
I can fully recommend the CD602, CD6x4, CD6x8, CD620, CD624, CD630, CD634, CD820, CD830 and the CD850 family, they have the greatest VFDs of all CD players I know and run super stable once you fixed the CD clamp rotor unit.
I've gone more or less the same route like you, fixing all the obvious stuff didn't help at first, because there are so many parts that can go wrong in these units. But nevertheless, don't give up, once they are playing stable, they are wonderful CD players that have some very unique features. Never would I trade them for anything from a Japanese company (Sony, TEAC, etc.)
I have one perfectly working 304 (transplanted CDM0, originally CDM1), the mentioned silver 304 (CDM1) and a CD204 (CDM0), a very weird combination of CD104, CD304 and unique servo and decoder board layout (no SMD), that also is waiting to be fixed.
The later CDM4 players I have are rock solid compared to CDM0, CDM1 and CDM2.
I can fully recommend the CD602, CD6x4, CD6x8, CD620, CD624, CD630, CD634, CD820, CD830 and the CD850 family, they have the greatest VFDs of all CD players I know and run super stable once you fixed the CD clamp rotor unit.
You think display board is causing power supply problems? Hm, I didn't replace caps on my display board...
Regarding cdm4, the one that got me started was philips cd 207 I've bought on flea market for 4$, had to repair turntable motor, but it's been working flawlesly. I did a lot of things to it, replaced tda 1541 decouplig caps, turned it to no oversampling mode and it just works. Unlike my sony 227esd...
I even like the ugly design, it looks like some movie prop, I think I've counted 6 different lettering fonts on it...
I got 304 because I was curious how it sounds compared to tda1541 players, which I like very much. Its prettier on the inside, I mean die cast chasis is naim category, even revoxes used pressed sheet metal. Though boards are not that great, I've lifted a couple of old traces.. And I love the fact that you can disasemble everything on cdm-1, polishing and lubricating turntable axle made it totally silent, when it spins like crazy : )
Regarding cdm4, the one that got me started was philips cd 207 I've bought on flea market for 4$, had to repair turntable motor, but it's been working flawlesly. I did a lot of things to it, replaced tda 1541 decouplig caps, turned it to no oversampling mode and it just works. Unlike my sony 227esd...
I even like the ugly design, it looks like some movie prop, I think I've counted 6 different lettering fonts on it...
I got 304 because I was curious how it sounds compared to tda1541 players, which I like very much. Its prettier on the inside, I mean die cast chasis is naim category, even revoxes used pressed sheet metal. Though boards are not that great, I've lifted a couple of old traces.. And I love the fact that you can disasemble everything on cdm-1, polishing and lubricating turntable axle made it totally silent, when it spins like crazy : )
Go slowly, step by step. And don't expect it to be working tomorrow. Give it time, thats what I learned from these units.
yeah, but should I deal with old 304's with lots of chips, or should I just save and get a naim? this is the question.
I guess drinks.
younger men will understand.
I guess drinks.
younger men will understand.
I have a CD303 and a CD304MK2, and a Naim CDi which is one of the best: earlier versions have CMD4, later ones have CDM9. Silver crown TDA1541A and very good sound, nice display, and solid top loading tray. I made a daughter board for mine with a tent clock and a PMD100, tested it in a later Philips based machine, did not manage to implant it into the Naim yet, but expect to get a nice sound improvement.
So yes, if you can, get yourself a Naim by all means. The bigger brother of the CDi was the CDS1: a 2 box player with an external PSU. The CDi is essentially a CDS1 in one box...
So yes, if you can, get yourself a Naim by all means. The bigger brother of the CDi was the CDS1: a 2 box player with an external PSU. The CDi is essentially a CDS1 in one box...
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