Question about Crate Music
Web page with schematics and requests:
User guide at link below from 1998 has mailing address in St. Louis.
Crate VC 6112 Owner Manual
Posted on Feb 21, 2018
Testimonial: "Thanks for the info, I had to dig around a little for it but it was on the 10th comment. Thanks again"
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
Hi. use this link to check for the schematics.
Posted on May 31, 2010
Real basic owners manual is here:
Look at the chassis, or pull a part number off the original speaker to match speaker and back cross reference to the amp versions that used it. The OM is at least good enough with the block diagram to allow it to be serviced easily enough.
Posted on Feb 21, 2012
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
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