POWER AMPLIFIER REPAIR HOW TO

they will idle around 1-2 amps and when the output reaches 1.8-2v RMS no load. these amps also have an ODD ac line current draw at low power. It currently covers ribbon cable replacement, power amplifier IC replacement and several other common repairs. Head units are very fragile compared to amplifiers and simple mistakes can cost 50 or more to resolve. A 15 amp ATC/ATO fuse may be required for amps rated over 1000 watts. When powering up an amplifier that youre repairing, you should do so with a 10 amp ATC/ATO fuse in the B+ power line. This page includes a number of tips to help you avoid costly mistakes. If you simply want your amp to work properly and you have no interest in learning more about electronics, pay someone to repair your amplifier. Crest/Peavey replaces them with MJ21193/4 devices and i can report that works well. A new page has been added to help introduce head unit repair. the output devices are no longer available.

so if you havent found exploded switch bank mosfets or output devices then most likely the problem is something small. otherwise the problems are pretty minor, bad caps, open resistors etc. Ignore the front LED's these amps are pretty rock solid and when they fail.the go boom and there is lots of damage. Study the schematics and work your way through the problem. many times they will get damaged during installation and the screws will make contact with the transistor case when warm. I have found many that after thermal cycling so many times they just go open.Д¬heck the shoulder washers on the TO-220 devices. even a bug getting between the sinks can cause them to arc if the amp is running hard!ДЄlso look for open resistors. there are only 2 thin rails that hold the modules and rough tour duty service can cause those rails to bend and the sinks to touch and arc. these amps have a tendency for those heatsinks to arc across the sinks. In the 10001 check in between the heatsink's. if the signal looks clean with minimal DC offset then you have bad caps causing it to stay in protect. inject a a signal into the amp and take a look at the signal on those white wires. there are 2 sets of solid white wires from each output module to the output relays. they look fine from the outside but pull one out of circuit and measure it and there bad. The problems i have seen most often in Crest amplifiers is bad capacitors. stop right now! I have repaired many hundreds of amps and this thing still scared the bejezus outta me! (however it was also one of the tamest amps i have ever worked on!)

POWER AMPLIFIER REPAIR HOW TO

remember this amp will do 5000 watts across 1 ohm!!! get your hand across those sinks and POOOF and they will vaporize a screwdriver and send lots of hot metal flying around! USE CAUTION! that warning on the top cover is not a joke! and remember those are ACTIVE LIVE heatsinks!!! and make sure you know how to SAFELY drain the power supply capacitor banks! you have 320V across the upper rails at an ungodly amount of amps. I have just finished rebuilding a 10001 and a 80 and ca12/9/6/4's and am now working on a 9001 I am however no expert but.ДЇIRST**** use massive amounts of caution when working on a 10001 that amp can and will kill you should you make a mistake.

Power amplifier repair