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Need schematic for Crate PCM-8 DP+

Looks like one side of power amp is out.

Posted by Bob Farlow on

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John McPherson

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Without a schematic you can still trace the circuit to locate the fault.

Put a music source or sound source into the bad channel and a good channel, and with an oscilloscope or with a pair of high impedance headphones with test leads on the ends- you can set up a low z headphone with an impedance match trasformer, make sure you have test prod ends on one of the leads. The other can go to a chassis ground. Start at the input and work your way forward comparing the signal between the good channel and the faulty channel. When you lose the signal or you encounter severe distortion, you are in the vicinity of the defective part.

Common failures are a Deffective 4558 or TL072/TL071/TL074 IC chip. You may have a faulty electrolytic capacitor, or even a faulty bypass caoacitor in general. Bad solder connections, even a broken fim resistor.

With the IC chips, the usual power pins for an 8 pin plastic or ceamic DIP are pins 4 and 8. usual outputs for the 8 pin are 1 and 7 the remaining pins are the inverting and noninverting inputs. 2 and 3 and 5 and 6.

Also check switches and especially those with interupts on the input and output jacks- they can get dirty.

Posted on Apr 11, 2012

  • Bob Farlow
    Bob Farlow Apr 11, 2012

    Thanks to all. I finally obtained schematic and found a faulty LM35 temperature monitor IC which was saying the heatsink was hot when it was really cool.

  • texanabs
    texanabs Oct 13, 2012

    Where did you obtain the Schematic?

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2 Related Answers

Anonymous

  • 192 Answers

SOURCE: amps broken need to fix it

Their may be a schematic on the inside of the amp.I don't remember if Crate puts one or not. And I have had several Crate amps. never needed repair except for tube replacement. If there is not one in side , go here and find what you need . http://www.crateamps.com/support/warranty/ Good luck DFD please rate me TK U

Posted on Apr 19, 2009

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Anonymous

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SOURCE: Crate GTX-30 Guitar Amp Schematic... The thing

Hi. use this link to check for the schematics.


crateamps.com/support/discontinued.php

or

music-electronics-forum.com/sitemap/f-60.html.

take care.

Posted on May 31, 2010

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