Hi,
Trying to revive a Philips cd101 with one working channel. Purchased it as such. Has new 47uf caps I know that. Has a 150uf cap which is new I know that.
Both TDA chips work as I swapped em around. Tested the relay in the working channel channel and it measures fine. The non working channel well that is a different story. The non working channel relay measures around 15v on one side and around 7v on the other side of the relay. Also, only sound out of the non working channel is cd spinning noise. I can also hear the fast forward, etc.
All the caps in the power supply are perfect and all regulators in supply measure to spec within range.
Any help would be helpful😀
Trying to revive a Philips cd101 with one working channel. Purchased it as such. Has new 47uf caps I know that. Has a 150uf cap which is new I know that.
Both TDA chips work as I swapped em around. Tested the relay in the working channel channel and it measures fine. The non working channel well that is a different story. The non working channel relay measures around 15v on one side and around 7v on the other side of the relay. Also, only sound out of the non working channel is cd spinning noise. I can also hear the fast forward, etc.
All the caps in the power supply are perfect and all regulators in supply measure to spec within range.
Any help would be helpful😀
If you need the Service manual you can download it from here: PHILIPS CD101-00-05 SM Service Manual free download, schematics, eeprom, repair info for electronics
Just wait until it says Get Manual
Just wait until it says Get Manual
Thanks already have a manual...not sure where to proceed from here. I don't have a scope, but I pulled the relay out and replaced it with a working one, so i know its not the relay. but it has to be something thats causing the voltage spike.
There are two relays involved on each outputs. I take it that you are talking about the "kill" relay. The last one. Or are you talking about the one involved in the deemphasis (DEEMP) circuit. A fault in the DEEMP relay should not give you a no output situation, but a fault in the op-amp could.
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spike in voltage?
I am not sure what you mean by that. It is the relay involved in the frequency compensation that was used on older CD´s. If the CD is recorded with DEEMP this relay kicks in. Check that you have + - 12 volt on the OP-amp NE5532 pin 4 (-12volt) and pin 8 (+12volt).
I am not sure what you mean by that. It is the relay involved in the frequency compensation that was used on older CD´s. If the CD is recorded with DEEMP this relay kicks in. Check that you have + - 12 volt on the OP-amp NE5532 pin 4 (-12volt) and pin 8 (+12volt).
The NE5532 contains two Operational amplifiers. The first is involved in the DEEMP circuit. The last is only an output buffer (unity gain, no amplification)
No I have not been able to even look at it the last week or so on account of work. But the DEEMP relay, one of them measure absolutely high voltage around 16v on one leg and somewhere around 7v on the around give or take a volt. The 5532's, one measure fine, the other measures the same voltages as the demp relay. No where near what the manual states.
hi, araound the NE5532 are golden caps, maybe one of them is electrical short.
kind regards
Rüdiger
kind regards
Rüdiger
Yeah I'm begining to think that myself. I will have a go at them this weekend. I have a spare parts board that I will compare values.
Thanks
Thanks
Okay..update not sure what I did, but I took a soldering iron to all the caps as some looked old and put it all back in place, and it worked fine. Not sure exactly what it was or which one needed it though. But glad its up and running.
Thanks fro all the input guys.
Thanks fro all the input guys.
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