I have a RF T10001BD. It came to me disassembled, MEHSA strips out, most of the FETs were shorted. I replaced the drivers, tested gate resistors, and set it in the frame (ground screws in place) without any FETs in it. Applied ground and remote, I have good gate drive coming out of the UC3526ADW Pin 13 (and all the way to the FET vias). Pin 16, however, has no output. If I lift R26, I get a sort of sharkfin wave.
I looked at the datasheet for the 3526 and I don't see what could cause this, it looks to me like they are both driven from Toggle F/F, but that stuff gets a bit above my head.
Any recomendations?
I looked at the datasheet for the 3526 and I don't see what could cause this, it looks to me like they are both driven from Toggle F/F, but that stuff gets a bit above my head.
Any recomendations?
Ok, figured I'd ask before I ordered some, didn't know if anything could cause one output to be different.
I'll get some coming and report back.
I'll get some coming and report back.
The outputs should be identical except for being out of phase.
The 3525 and 3526 have emitter-follower pairs for the outputs so they outputs can pull up and down on their own for any reasonable load. If the outputs are different, the IC is likely defective.
The TLx94 ICs can only drive high with any real current. To pull down (more than the lightest of loads), it requires external pull-down resistors. If one of the pull-down resistors is out of tolerance, that could make the outputs different.
The 3525 and 3526 have emitter-follower pairs for the outputs so they outputs can pull up and down on their own for any reasonable load. If the outputs are different, the IC is likely defective.
The TLx94 ICs can only drive high with any real current. To pull down (more than the lightest of loads), it requires external pull-down resistors. If one of the pull-down resistors is out of tolerance, that could make the outputs different.
Replaced the IC and got my gate drive back! Worked my way through the rest of the amp, found another dirty master/slave switch. Luckily I bought 10 when I found one that would work on my T20001BD. Also replaced the Gain while I was there since it was a pretty filthy amp. Seems to be working so far, haven't load tested it.