Same result. As soon as the jumper touches, the amp buzzes. The green LED lights up when this occurs. There is a slight change in the mv reading on the PS FETs gates but only in the mv range and if left for more than an instant, the mains limiter starts to glow.
Pulled R29 and what I think is R30(the designation label is incomplete as a via is underneath this resistor and I can't find R30 anywhere else on the driver board). When powered up in this state, the protection LED turns off and the green LED lights up. There is no buzzing from the amplifier but there is also no voltage on the PS FETs gate legs.
These are the resistors between the driver IC and the drivers.
Do you see drive out of the IC?
If not, what happens if you jump 8-16?
Do you see drive out of the IC?
If not, what happens if you jump 8-16?
Confirmed that those resistors are connected to pin11 and pin14 of the 3525. I assume the 3525 is defective as I read 10+v on the outputs that sometimes switches between pin11 and pin14 depending on how many times I power up and down with the jumper wire. Resistance reads 10kohms between GND and pin11 and pin14 each.
10k is reading R31 and R32.
If the oscillator frequency is right (20kHz-30kHz), replace it if you have it.
If the oscillator frequency is right (20kHz-30kHz), replace it if you have it.
Don't think the 3525 is the problem in this amp. I swapped it out for one from another amp and the same situation in this amp occurs. The one from this amp is giving out good drive signals in the other amp also. The other thing that is happening is that intermittently/randomly during checking while the amp is being powered up, but in protection, the PS FETs heat up quickly until one fails by the time the mains limiter lights up. I removed all four gate drive transistors and it still happened, possibly when I touch the 3525 output pin with the meter probe. I am going to pull all the PS FETs to continue testing for drive signals. What do I check for next?
All the voltages have remained essentially the same as with the other IC. The behavior is identical as well.
Actually, I realized I didn't take new readings when the jumper was in place, just when in protection. These are the voltages on the 3525 with the amp powered up, remote on and the jumper from pin16 to pin8 in place.
1) 14.8mv
2) 2.3V
3) 30mv
4) 923mv
5) 591mv
6) 1.1V
7) 584mv
8) 2.2V
9) 2.3V
10) 32.1mv
11) 25mv
12) 18mv
13) 11.6V
14) 10.4V
15) 11.6V
16) 2.2V
At this time pin14 had the 10V continuous output. I turned the amp off and back on and the continuous 10V was now coming out of pin11. Each time afterwards, the 10V remained on pin11, and the other voltages remained the same.
1) 14.8mv
2) 2.3V
3) 30mv
4) 923mv
5) 591mv
6) 1.1V
7) 584mv
8) 2.2V
9) 2.3V
10) 32.1mv
11) 25mv
12) 18mv
13) 11.6V
14) 10.4V
15) 11.6V
16) 2.2V
At this time pin14 had the 10V continuous output. I turned the amp off and back on and the continuous 10V was now coming out of pin11. Each time afterwards, the 10V remained on pin11, and the other voltages remained the same.