S
stani772577
Hi there
My CD player - Pioneer PD-7700 (heavily modified some years ago) just died, refuses to read any disc at all, looks like either the laser or the logic of the machine is at fault.
I would like to bring it back to life without spending too much (I have another player - Marantz CD4000), but don't know where to start from. I may replace all semiconductors - transistors and ICs one at a time, but will need some info on japanese transistor replacements.
If anyone has any information or suggestions about this particular machine your help will be greatly appreciated.
Regards from Oziland
Stan
My CD player - Pioneer PD-7700 (heavily modified some years ago) just died, refuses to read any disc at all, looks like either the laser or the logic of the machine is at fault.
I would like to bring it back to life without spending too much (I have another player - Marantz CD4000), but don't know where to start from. I may replace all semiconductors - transistors and ICs one at a time, but will need some info on japanese transistor replacements.
If anyone has any information or suggestions about this particular machine your help will be greatly appreciated.
Regards from Oziland
Stan
S
stani772577
Hi Eric
No, the disc does not spin at all, I can hear a couple of clicks and that's it. If I turn the disc upside down then it spins it, but because there's no data there it stops after a while. That makes me think that the motors are ok and maybe even the laser is still ok. Unfortunately I have no service manual and have no plans to pay $20US for one just to find that maybe the desease is incurable or rather the remedy will cost as much as a new CD player. So, my idea is to play with it and use it as a learning tool (or device).
Kind Regards
Stan
No, the disc does not spin at all, I can hear a couple of clicks and that's it. If I turn the disc upside down then it spins it, but because there's no data there it stops after a while. That makes me think that the motors are ok and maybe even the laser is still ok. Unfortunately I have no service manual and have no plans to pay $20US for one just to find that maybe the desease is incurable or rather the remedy will cost as much as a new CD player. So, my idea is to play with it and use it as a learning tool (or device).
Kind Regards
Stan
Stan,
Your symptoms indicate a defective pick-up with either a collapsed suspension or the grating out of whack. The clicks you hear is the lens moving up and down trying to achieve focus lock.
If you obtain a service manual and put the unit into test mode you will be better able to determine the cause.
If the player uses a white ribbon cable between the pickup and the servo board then this might be defective, the cure being to replace it with a mylar replacement cable.
Jam
Your symptoms indicate a defective pick-up with either a collapsed suspension or the grating out of whack. The clicks you hear is the lens moving up and down trying to achieve focus lock.
If you obtain a service manual and put the unit into test mode you will be better able to determine the cause.
If the player uses a white ribbon cable between the pickup and the servo board then this might be defective, the cure being to replace it with a mylar replacement cable.
Jam
S
stani772577
Eric and Jam
Thank you for your replies.
Now to answer your questions - the ribbon cable between the pickup and the board is actually a mylar one and is plugged into a connector on the main PCB. Also, on the cable, before the connector to the PCB there's something which looks like a tiny pot.
Stan
Thank you for your replies.
Now to answer your questions - the ribbon cable between the pickup and the board is actually a mylar one and is plugged into a connector on the main PCB. Also, on the cable, before the connector to the PCB there's something which looks like a tiny pot.
Stan
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