There is only one relay (near the speaker terminals).
When it begins to heat up, does it heat up under the power supply FETs or under the output FETs?
When it begins to heat up, does it heat up under the power supply FETs or under the output FETs?
I put my hand on the outside of the heatsink i didnt really touch the individual heatsinks, for the output/power supply fets. but i will check that out next.
it was infact the powersupply fets that were heating up. The amp is back to blowing the inline fuses. Any ideas ?
You may have a shorted transformer.
What's the resistance between the RCA shield and the negative speaker terminal?
What's the resistance between the B+ terminal and hte negative speaker terminal?
Do any windings on the transformer appear to be discolored or burned?
What's the resistance between the RCA shield and the negative speaker terminal?
What's the resistance between the B+ terminal and hte negative speaker terminal?
Do any windings on the transformer appear to be discolored or burned?
The transformer looks fine, i dont see any discoloration or burns.
Negative speaker terminal to RCA shield L/R : .3
Negative speaker terminal to B+ : 10.6 and the numbers just keep going up
Negative speaker terminal to RCA shield L/R : .3
Negative speaker terminal to B+ : 10.6 and the numbers just keep going up
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with the rectifiers out of the circuit, the inline 10 amp fuse blows.But it also does this with the rectifiers in too. Im thinking that the power supply fets are bad again.. Also i noticed on the transformer some nicks in the insulation on a few different parts. Im not sure if the nicks in the insulation are harmful to the transformer (see pics)
Look at the green / red wires close to the caps
Look at the green wire in the middle
Look at the green / red wires close to the caps
Look at the green wire in the middle
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Leave the rectifiers out.
Check the FETs out of the circuit. You have to know whether they're defective or not to do any more troubleshooting.
I don't see anything obviously wrong with that transformer.
Check the FETs out of the circuit. You have to know whether they're defective or not to do any more troubleshooting.
I don't see anything obviously wrong with that transformer.
I checked the fets they are in fact bad. I ordered more, they should be in sometime this week. The samething happened last time after the fets were replaced, the amp doesnt blow fuses right away but after about 15-20 min of it being on the amp will start to blow fuses again.
Confirm that the gate voltages are all still approximately 5v. Clamp all transistors tightly to the heatsink and insert a 10 amp fuse in the B+ line BEFORE applying power. After applying power, allow it to idle for 10-20 minutes. If there are no problems, try twisting/pushing/pulling on the transformer. If it doesn't blow the fuse, reinstall the rectifiers and let it idle again.
Fixed, replaced the two rectifiers,4 irfzn48's / 2 irf540's / 2 irf9540's . Had the amp playing for about two hours now works perfect. Thanks for all the help!
Perry Babin was the cure my friend,I have been reading some of his post.I do not think even the guys that design the amps can troubleshoot one as well as he can.
Perry if you read this thanks for the help on the little PUNCH 45HD it is now
playing on my bench
http://www.diyaudio.com/forums/car-...h-45hd-no-vcc-pin-12-tl594cd.html#post2300452
Perry if you read this thanks for the help on the little PUNCH 45HD it is now
playing on my bench
http://www.diyaudio.com/forums/car-...h-45hd-no-vcc-pin-12-tl594cd.html#post2300452
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