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Old 11th December 2005, 07:53 AM   #1
Luke is offline Luke  New Zealand
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Default troubleshooting philips cd650

I screwed up and have broken my cd player.
I changed some caps, and removed the output caps, reclocked it and put chokes in the supply lines.
As far as I can see I made two mistakes neither of which should have damaged the player.
The tda1541 -15V rail cap was back to front, I replaced it and the tda1541.
I also forgot to turn the power supply for the clock on (its still not permanently installed) So the thing was spinning like crazy for a couple of minutes untill I realised all was not well.
After I rectified the mistakes the player seems to track fine, but there is absolutely no output. Any ideas how to trouble shoot this fault?
I have a schematic BTW and a scope.

thanks Arthur
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Old 11th December 2005, 09:09 AM   #2
ash_dac is offline ash_dac  United Kingdom
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Quote:
I changed some caps, and removed the output caps, reclocked it and put chokes in the supply lines.
Hi,

Please explain what you meant by 'removed the output caps'

I'm guessing it had NE5532 output amp's.


Kind regards,

Ashley.
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Old 11th December 2005, 09:18 AM   #3
Luke is offline Luke  New Zealand
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Quote:
Please explain what you meant by 'removed the output caps'
Its a mod I did on my marrantz cd67 as per Kuei's instructions.
Its a dc blocking or coupling cap from the output of the opamps to the mute transistors I think. they are 220uF 10V caps and I replaced them with a piece of wire.
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Old 11th December 2005, 09:37 AM   #4
ash_dac is offline ash_dac  United Kingdom
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Luke,

Have you tried your amp with a different source?


Kind regards,

Ashley.
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Old 11th December 2005, 09:40 AM   #5
Luke is offline Luke  New Zealand
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Quote:
Have you tried your amp with a different source?
Yes I have. And it works, so Im sure something aint right with my cd player
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Old 11th December 2005, 03:36 PM   #6
guido is offline guido  Netherlands
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Do you have output on the 'filtered' output?
If not, take out the wire that replaced the 220u cap and try again.

As for removing those 220u caps: that is possible in the 63/67 because the offset is minimal. Did you measure the offset before you did the mod?

Guido
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Old 15th December 2005, 05:56 AM   #7
Luke is offline Luke  New Zealand
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Hi Guido.

I put the caps back and still nothing. Something that didnt seem right was the cap across pin pin 13 and 24 on saa7220p/A is only 3.3V and not 5. Is this ok?
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Old 15th December 2005, 09:04 PM   #8
guido is offline guido  Netherlands
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Not really, that's a +5V supply cap. So maybe it's toast.
Use that scope to see if there is anything going on on the I2S lines towards the 7220 and towards the 1541.
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Old 15th December 2005, 10:10 PM   #9
Luke is offline Luke  New Zealand
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thats what I thought. If its toast is it worth trying to fix?
I would think these parts are almost impossible to get now?
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Old 16th December 2005, 10:47 AM   #10
guido is offline guido  Netherlands
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I meant the cap, not the 7220 You say you have a scope: start measuring!
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