I can't seem to get my drive signal correct for the power supply mosfets. I changed the ic the pnp transistors on the driver card. ? I'm not sure what the cause of this is. I could use some guidance. I found it since this post. Trace from someone sodering on bottom of driver card via.
Attachments
The issue is the amplifier after I solved the power supply issue. The amplifier just power cycles. It's starts and draws current then back again. The drive looks good with mosfets in the power supply. I tested
Q2000.) -6.86
Q2001.) 6.80
Q2012.) 11.86
Q2010.) 1187vdc
I just removed all the output transistors. But could use some help.
Q2000.) -6.86
Q2001.) 6.80
Q2012.) 11.86
Q2010.) 1187vdc
I just removed all the output transistors. But could use some help.
not with the output transistors in curcuit it like it powers up attempts to engauge the output section, then draws about 9-10 amps of current. When it was dong this four output transistors were getting hot. I tested all them out of circuit for leaks and shorts. All test ok
Yes they were. I replaced them both already Sean. The board in that area is badly popcorned as well by the previous attempt of a repair.
All outputs back in and no protection. Nothing in s shorting. My scope probes got broke today, I tripped on them and broke both of them. So I am half bild one works, so/so. If there is an audio problem, I'll address that next. Any idea what this green jumper wire is for? From tap to base of q2001?
So to be clear after replacing the LM5110's the amp will power up and idle now? It is no longer cycling? Have you checked for audio?
Yes it's powered up and not cycling. I need to dig out a probe from my techtronics scope. This one is broken. Ordered new ones, and awaiting them to come in. I believe it does have audio. I'll do a practical test today and find out. It is oscillating.
Following cause I am working on the other one of these that I have. Question how did you take out the PS drive board, I cut the legs on the 90 degree header, closest to the front panel and then solder blobbed the back header to remover, then replaced the front 90 degree header. Seemed the fastest and safest way becasue the holes in the board are super tight to the header pins.
Quickchip on the board the card falls right out. No damage to any via's or legs of the driver card. Use the flux and the low temp. Melting metal and it will come right out.
Anyone have any ideas on the audio issue this amp is having? I have never dealt with this issue on one of these amplifiers before. high distortion in the audio, yet clean on the output jacks. i can attempted to change the tl072 in front of the amplifier. what on the driver card lm6172's? and some more op amps?
I'd suggest troubleshooting with the rectifiers out of the circuit.
repair_tutorial/miscellaneousstuff/rockford/repairnotesrockford.htm
Item #25.
repair_tutorial/miscellaneousstuff/rockford/repairnotesrockford.htm
Item #25.
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