Hi everybody,
a couple of weeks ago I bought an old Sony CDP-195 (1991/92) at the flea market. The unit was sold for 10 euros as “non working”, so it looked like a good chance to try to learn something about CD players, which I’m not really confident with.
The player looks 95% dead. The only thing (half) working is the tray: it opens but it doesn’t close. It only does If you switch the unit off (with the tray open), and then switch it back on. This leads me to exclude contacts or mechanical problems. Microswitches have been cleaned anyway, as described in Mooly’s CDP-790 thread.
The front panel seem to work: all the buttons respond correctly, displaying the respective mode or symbol (Play, Stop, Pause, Track selection, functions etc.) except that nothing happens.
All the rest is dead. No action by the sled and spinning motors, no movements of the pickup, no light from the laser. When a CD is inserted, the BD Board doesn’t lift up, so the disc doesn’t lock to the platter and falls around.
The tensions printed on the Main Board have been tested and look ok. Discrete components have been tested and look ok.
Anyway, even if the BD board is disconnected (ribbon cable detached), and the player is in stop mode, transistors Q202 and Q208 become hot quickly. Not sure whether it’s a problem or not, maybe it’s just the way it should be, since Q208 has a heatsink.
Tension on pin 1 (+7v) and 6 (+5v) of the BD Board ribbon cable socket are ok on the Main Board side.
I suspect there’s a problem with IC102 (LA6532M), the one that controls the motors. I checked the tensions in Play mode, and I have just 2,7v on the pins 18/19 (controlling the spindle M) and 0v on pins 12/13 (controlling the Sled M).
I’m tempted to replace the IC, but I’m not 100% sure. I read everywhere that replacing the laser unit will solve almost any problem, but I suspect this time the fault is elsewhere.
Any suggestion will be greatly appreciated. Thank you.
--------
PS Service Manual attached
PPS For the ones following my other thread about the infamous Transylvania cassette recorder/player, the unit is still on hold, but I haven't give up. Just had enough of it. Sooner or later I'll come back to it.
a couple of weeks ago I bought an old Sony CDP-195 (1991/92) at the flea market. The unit was sold for 10 euros as “non working”, so it looked like a good chance to try to learn something about CD players, which I’m not really confident with.
The player looks 95% dead. The only thing (half) working is the tray: it opens but it doesn’t close. It only does If you switch the unit off (with the tray open), and then switch it back on. This leads me to exclude contacts or mechanical problems. Microswitches have been cleaned anyway, as described in Mooly’s CDP-790 thread.
The front panel seem to work: all the buttons respond correctly, displaying the respective mode or symbol (Play, Stop, Pause, Track selection, functions etc.) except that nothing happens.
All the rest is dead. No action by the sled and spinning motors, no movements of the pickup, no light from the laser. When a CD is inserted, the BD Board doesn’t lift up, so the disc doesn’t lock to the platter and falls around.
The tensions printed on the Main Board have been tested and look ok. Discrete components have been tested and look ok.
Anyway, even if the BD board is disconnected (ribbon cable detached), and the player is in stop mode, transistors Q202 and Q208 become hot quickly. Not sure whether it’s a problem or not, maybe it’s just the way it should be, since Q208 has a heatsink.
Tension on pin 1 (+7v) and 6 (+5v) of the BD Board ribbon cable socket are ok on the Main Board side.
I suspect there’s a problem with IC102 (LA6532M), the one that controls the motors. I checked the tensions in Play mode, and I have just 2,7v on the pins 18/19 (controlling the spindle M) and 0v on pins 12/13 (controlling the Sled M).
I’m tempted to replace the IC, but I’m not 100% sure. I read everywhere that replacing the laser unit will solve almost any problem, but I suspect this time the fault is elsewhere.
Any suggestion will be greatly appreciated. Thank you.
--------
PS Service Manual attached
PPS For the ones following my other thread about the infamous Transylvania cassette recorder/player, the unit is still on hold, but I haven't give up. Just had enough of it. Sooner or later I'll come back to it.
Hi,
Does the motor close the tray when you push it a little with the finger ? Looks like a ROM has been shorted perhaps, do you suspect it has been opened or tweaked already ?
Not sure you should spend more monney to fix it by tries and errors in the dark. And it is not a high end cd player, a basic model only.
But at 10 e if you think twice, you have a lot of parts to desolder for future diy, a power supply, some op amps and a nice case. Not a bad deal.
Does the motor close the tray when you push it a little with the finger ? Looks like a ROM has been shorted perhaps, do you suspect it has been opened or tweaked already ?
Not sure you should spend more monney to fix it by tries and errors in the dark. And it is not a high end cd player, a basic model only.
But at 10 e if you think twice, you have a lot of parts to desolder for future diy, a power supply, some op amps and a nice case. Not a bad deal.