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Light is on constantly DD5 won't switch on

Customer said it was plugged into "DC" by accident. I took to mean wrong value power supply. When I first Plugged it up the light was on, but I could't get it to do anything. checked all the caps for shorts, then found that the switching transistor was fried. I thought I had it! But, no. After replacing the switching transistor, still no go. What else could it be? I know I'm not going to be messing around with any of the wave soldered components without a microscope.

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  • 14 Answers

Have had a similar problem on Yamaha keyboards and it was down to the burnt out diodes after the power input. I dont have a DD5 schematic so may be barking up the wrong tree. Do you have voltage in / out at the voltage regulator?

Posted on Jan 08, 2013

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PolyrhythmFX
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SOURCE: Roland JC-55 amp stopped working

Sounds like a transformer problem or something else in the power section..maybe even a transistor....since the LED status light would be direct from DC power. Take it to a trusted audio electronic tech and get it looked at. Keep in mind that these amps are about $150-$200 used on Ebay so don't spend too much getting it fixed if it is indeed a transformer. I'd definatley get it looked at. I have a JC-77 and it rocks for clean!

Posted on Jun 20, 2009

soundchasr
  • 8 Answers

SOURCE: NO sound through the AMP even though the power light comes on

Not a fuse. First thing, to check your speaker (amp unplugged, of course), touch the + and - speaker connections to a 9V battery. If you don't hear a pop sound then your speaker is blown. Thus, no output sound. If speaker is OK, then the output IC is your problem.

Posted on Jul 25, 2009

  • 4 Answers

SOURCE: There is a constant loud hum/buzz whenever I turn

First and foremost , check your signal chain. By that, i mean put the pedal aside, ...just unhook it and take it out of your signal path. Using the same cables , guitar , amp, other pedals - borrow a friends MT-2 if you can get one , and try THAT to see if THAT works , OR any other kind of distortion pedal. If another one works ok , it's YOUR MT-2. Boss pedals are pretty rugged , but sometimes the little actuator (on/off switch) underneath the treadle (where you push your foot down) will become faulty. That's a high-gain pedal - are you using a basic Strat or other single-coil pickup guitar? If so , are you playing close to any flourescent lights? SIngle coils are noisy around those lights. Will cause a hum / buzz if using a heavy dist. pedal. You can check that by moving around as you play.

Posted on Nov 02, 2009

  • 73 Answers

SOURCE: Amp was plugged into faulty outlet in club and smoked the amp

if you popped the fuse on your amp, you may have more than transistors going bad. the power tranny may be damaged on the primary or secondary winding, the bridge rectifier/diodes may be shorted or open, may have damaged filter caps, then on to transistors etc. sometimes this is what i ulitmately diagnose as catastrophic failure.

Posted on May 27, 2010

  • 1138 Answers

SOURCE: TC Electronic D-Two Power unit locked up display

I don't know if this will help. Have you looked for a battery on the circuit board that backs up the memory? A lot of synths use them and when they go the unit quits functioning. Some will start right up again once the battery is replaced others require a system update through a download. Anyways I always recommend contacting the company in question. They should be able to tell you simply whether it needs servicing or not:http://tcsupport.custhelp.com/cgi-bin/tcsupport.cfg/php/enduser/ask.php

Posted on Jul 14, 2010

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