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Old 15th May 2011, 05:27 PM   #21
Gunman is offline Gunman  Russian Federation
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Quote:
Originally Posted by Perry Babin View Post
4 photos. Sorry for the delay. I couldn't find the board.
Index of /temp/mtx1501d01
Thanks!!!
I'll be very glad to see You as my guest in Russia!
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Old 28th May 2011, 11:07 AM   #22
Gunman is offline Gunman  Russian Federation
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Do You have a circuit diagram of the power supply? I can't repair it
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Old 28th May 2011, 04:40 PM   #23
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What's wrong with the supply?
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Old 28th May 2011, 06:23 PM   #24
Gunman is offline Gunman  Russian Federation
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it does not start correctly, as I understood
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Old 28th May 2011, 07:10 PM   #25
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Have you powered it up yourself to confirm that there is a problem?
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Old 28th May 2011, 07:15 PM   #26
Gunman is offline Gunman  Russian Federation
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when I start whole amp - preamp operational amplifiers don't work
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Old 28th May 2011, 10:42 PM   #27
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Is the amp producing rail voltage on the main rectifiers?

What is the DC voltage on the power supply pins of the op-amps in the preamp section of the amp?
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Old 29th May 2011, 08:26 AM   #28
Gunman is offline Gunman  Russian Federation
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Quote:
Originally Posted by Perry Babin View Post
Is the amp producing rail voltage on the main rectifiers?

What is the DC voltage on the power supply pins of the op-amps in the preamp section of the amp?
Yes, the amp is producing rail voltage on the main rectifiers

But there is no sound, because of no voltage on pins of the op-amps in the preamp section of the amp (but the voltage is on all pins of transistor of this part of supply)

As I understood, You don't have a circuit diagram of the power supply? It will be much more easier...
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Old 29th May 2011, 11:29 AM   #29
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I have no schematic for this amp.

Do you have oscillation on FET471 near the yellow transformer?
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Old 31st May 2011, 01:15 PM   #30
amptech is offline amptech  Scotland
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@Skew, it sounds like your amp's o/p transistors are done in... possible done by to many speakers connected to the amp or during installing the unit..or being shorted circuited o/p end...before we get started have you got a test meter? so you can carry out some voltage checks...here's a handy way of working on car audio amps...use a 12 dc 1 amp mains pack power for repairs that way you can power it up and do some testing... do not connect speakers on the o/p end just yet just use your meter set on 200vdc range and see if there high dc on there..good working amp have very low dc in the mv readings...

now remove the clamps to the transistors these are shown in your picture but do not apply any power yet! test them for s/c and post the letter's numbers on here so we can point you in the right direction for replacements.. next remove the amplifier from it's casing and look over the track's for cracks or loose components and re flow the solder side. here's a useful tip type in the Google how to repair car amps that site will also show tips on testing and repair information..
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