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Old 2nd May 2009, 08:14 PM   #21
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Pin 3 is being driven high. Does it go back to pin 1 or pin 7 of the 8 pin IC (via resistors, possibly)?

If so, post the voltages on that IC also.

Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:


What's the number on the 8 pin IC?

It may also go to a PNP transistor (likely small, black, shaped like the letter D).
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Old 2nd May 2009, 08:38 PM   #22
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4558D

Pin 1: 10.34
Pin 2: 0.0
Pin 3: 5.62
Pin 4: 0.0
Pin 5: 1.42
Pin 6: 5.03
Pin 7: 1.42
Pin 8: 11.25
Attached Images
File Type: jpg 4558d#.jpg (13.9 KB, 75 views)
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Pyramid PB675 4 ch 800W
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Old 2nd May 2009, 09:04 PM   #23
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Does it appear that pin 1 of the 4558 is connected to pin 3 of the 494 (via diodes, resistors...)?
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Old 2nd May 2009, 09:25 PM   #24
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Quote:
Originally posted by Perry Babin
Does it appear that pin 1 of the 4558 is connected to pin 3 of the 494 (via diodes, resistors...)?
from what i can see, i dont think so.
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Old 2nd May 2009, 09:52 PM   #25
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Earlier, you removed at least one output transistor. Did you pull it to check it? Did you check the output transistors to determine if any were shorted?
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Old 2nd May 2009, 10:37 PM   #26
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Quote:
Originally posted by Perry Babin
Earlier, you removed at least one output transistor. Did you pull it to check it? Did you check the output transistors to determine if any were shorted?

I removed it to check it and to see if the reading changed once it was out. According to the data sheet it is fine.

I wanted to check the diff to a working amp, and my sony had a reading of 19 Volts on the #2 pin on the output transistors.

And I thought about putting the one transistor in place in a good amp, but dont want to break a good amp.
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Old 2nd May 2009, 11:32 PM   #27
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You're sure that none of the output transistors are shorted?

Does the amp have a protect LED?
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Old 3rd May 2009, 12:20 AM   #28
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Quote:
Originally posted by Perry Babin
You're sure that none of the output transistors are shorted?

Does the amp have a protect LED?

it has a protect led, but not sure if it works, i dont know how many volts it is so i can test it.
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Old 3rd May 2009, 12:42 AM   #29
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Are you sure that none of the output transistors are shorted?
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Old 3rd May 2009, 12:47 AM   #30
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Quote:
Originally posted by Perry Babin
Are you sure that none of the output transistors are shorted?

not sure, but im going to take this amp as a learner and take things off the board until i find a bad part(s).

If it was an expensive amp, I would continue.

Thanx for your help. (And will post if i find the problem).


I dont knw if u seen my other post on my source unit, the cd doesnt spin anymore, now I do want to fix that. - Car stereo doesnt want to play CD's anymore.
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