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Old 17th September 2014, 08:03 PM   #1
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Default Philips CD101 with no sound

Hello,
I have a Philips Cd101 with no sound. I believe the issue is with power regulator LM337MP which is 6224 in service guide.
All 3 legs measure -5.1.
Leg 1 should = -16.6
Leg 2 should = -31v
Leg 3 Should = -18v

All other power supply Regs measure to spec.
Subsequently both TDA1540 Dacs are missing the -18v supply on Pin 11 and the -13v on Pin8 and Pin 9.
There may be other issues but this is the most obvious.

All caps are new.
Hoping someone can give me a hand here.
Thanks
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Old 17th September 2014, 08:07 PM   #2
rayma is online now rayma  United States
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Location: Upper midwest
Quote:
Originally Posted by isitrisky View Post
Hello,
I have a Philips Cd101 with no sound. I believe the issue is with power regulator LM337MP which is 6224 in service guide.
All 3 legs measure -5.1.
Leg 1 should = -16.6
Leg 2 should = -31v
Leg 3 Should = -18v

All other power supply Regs measure to spec.
Subsequently both TDA1540 Dacs are missing the -18v supply on Pin 11 and the -13v on Pin8 and Pin 9.
Sounds like it's shorted, so try another 337, they're cheap.
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Old 17th September 2014, 08:12 PM   #3
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Diode BAW62 is also measuring -5.1v and I believe that comes before the LM337 in the chain, but I might be wrong.
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Old 17th September 2014, 08:15 PM   #4
rayma is online now rayma  United States
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Quote:
Originally Posted by isitrisky View Post
Diode BAW62 is also measuring -5.1v and I believe that comes before the LM337 in the chain, but I might be wrong.
Likely it is in "anti parallel" with the 337, to discharge the output capacitor when powered down.
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Old 17th September 2014, 08:30 PM   #5
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Diodes 6266 and 6268 are not measuring any voltage. Not sure if i should be getting a reading but it's really low like -.03v. And these diodes are in the same chain but further in front of the power supply chain. Diode 6267 is the one measuring -5.1v.
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Old 18th September 2014, 08:03 AM   #6
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So I installed a fresh LM337 Regulator and still same results. All 3 legs measure between -5.1v to -5.4v.
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Old 18th September 2014, 03:31 PM   #7
rayma is online now rayma  United States
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Quote:
Originally Posted by isitrisky View Post
So I installed a fresh LM337 Regulator and still same results. All 3 legs measure between -5.1v to -5.4v.
Hmmm. Maybe something downstream of the 337 is shorted, pulling everything down. The regulator may not be bad,
just in current limiting. Do you have a schematic?

Last edited by rayma; 18th September 2014 at 03:39 PM.
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Old 18th September 2014, 04:31 PM   #8
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Yeah I have a schematic...
I know its in the audio signal. I measured the 5532 amps, the both get +12/-12 on pin 4 and pin 8. Now according to the schematic pin 1, 5, 7 should read 3.4v, instead its reading -10.56v on all 3 pins on 1 5532 chip, while the other one is getting 3.54v on the same 3 pins. Its the 5532 chip that is marked 6525 in the schematic. And all the resistors and golden caps measure -10.56v as well.

Too much information I know.
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Old 18th September 2014, 10:45 PM   #9
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UPDATE..

So I traced 2 faulty diodes that come before the LM337. 1 was open circuit and 1 and was short circuit. Also, one of the tiny red wires had come undone from the transformer and was touching another wire. This is what probably caused the short.
Now the Lm337 has correct reading and so do all the TDA 1540 pins.

But still no sound! Reason I'm assuming has a lot to do with the fact they are getting -10.56v readings instead of 3.4 on pins 1, 5, 7. They are both reading +12/-12 on pins 4 and 8.

Any ideas would help.
Ray thanks for all your help and suggestions.
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Old 18th September 2014, 11:10 PM   #10
rayma is online now rayma  United States
diyAudio Member
 
Join Date: Apr 2011
Location: Upper midwest
Quote:
Originally Posted by isitrisky View Post
UPDATE..

So I traced 2 faulty diodes that come before the LM337. 1 was open circuit and 1 and was short circuit. Also, one of the tiny red wires had come undone from the transformer and was touching another wire. This is what probably caused the short.
Now the Lm337 has correct reading and so do all the TDA 1540 pins.

But still no sound! Reason I'm assuming has a lot to do with the fact they are getting -10.56v readings instead of 3.4 on pins 1, 5, 7. They are both reading +12/-12 on pins 4 and 8.

Any ideas would help.
Ray thanks for all your help and suggestions.
Sorry about all your trouble, what the heck happened to this player, anyway? Can you post a schematic?
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