Is the digital meter auto-ranging or do you have to set it to the various ranges of DC voltage?
If it's not auto-ranging, you need to set it to the most sensitive range (200mv?).
If it's not auto-ranging, you need to set it to the most sensitive range (200mv?).
yes it was on. I did not have any RCA's or sub connected though. Just Battery +, ground and remote.
Does it heat up with no speakers or RCAs connected?
Does it heat up with speakers and RCAs connected (volume set to 0)?
Does it heat up with speakers and RCAs connected (volume set to 0)?
It doesn't heat up with no RCAs or speakers connected. I'll try it with RCAs and speakers but the blown transistor has been disconnected but I have it in place to clamp down the rest to the heat sink. Will update once I've tried with RCAs and speaker
Right ive just tried with the RCA's and subwoofr connected and it worked fine. Left it running for about half an hour and it ran cool didnt even warm up. Volume was around 9 on the Headunit and I ran it using a 10amp fuse in the battery positive cable. This was with the blown transistor (Q507) disconnected but in place to allow the other transistors to be clamped down properly.
I tried again to see if i could get a reading from TP1 and TP2 but i still got 00.0.mv
I tried again to see if i could get a reading from TP1 and TP2 but i still got 00.0.mv
From what I remember, your complaint was that the amp was heating up (both channels, if I remember correctly). What changed between then and now?
The only thing i have changed from then to now is i have unsoldered transistor Q507 from the board. It is still in place to allow the clamp to hold the other transistors down.
However further inspection around my wiring showed but speaker cable on the sub box was slightly touching each other (few strands sticking out off the terminals) But I have insulated them up now. Could this have been a cause for the amp to heat up?
Should I replace Q507 and wire it up and test it with the gains etc set? or is it best to carry out a few more checks as I dont want it blowing up again.
Thank you
However further inspection around my wiring showed but speaker cable on the sub box was slightly touching each other (few strands sticking out off the terminals) But I have insulated them up now. Could this have been a cause for the amp to heat up?
Should I replace Q507 and wire it up and test it with the gains etc set? or is it best to carry out a few more checks as I dont want it blowing up again.
Thank you
okay so I just need to replace the blown FET and it should be okay to use? Should I check why I cant get a reading from TP1 and TP2?
Ive just replaced the blown FET. Tried to get a reading from TP1 and TP2 but still nothing. Should I still go ahead with installing it and using it properly or is it best to carry out some more tests?
thanks
thanks
You now need to set the bias. The two test points indicate the level of bias. With the bias pots fully counter-clockwise, it's expected to read 0.000v DC. You stated that the amp was overheating. The test across the bias test points was to see if there was too much current flowing through the outputs at idle.
Connect the meter across the test points (preferably with test clips of some sort) and slowly turn the bias pot until the voltage reaches 0.001v DC. Do this with no load and no signal. Let the amp idle and confirm that the bias remains constant. If it drifts up, readjust it until it remains at about 0.001v DC after several minutes. Do the same to the other channel. Have a 10-15 amp fuse in the B+ line while doing this.
Connect the meter across the test points (preferably with test clips of some sort) and slowly turn the bias pot until the voltage reaches 0.001v DC. Do this with no load and no signal. Let the amp idle and confirm that the bias remains constant. If it drifts up, readjust it until it remains at about 0.001v DC after several minutes. Do the same to the other channel. Have a 10-15 amp fuse in the B+ line while doing this.
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