There are very few components in the remote circuit. Follow back from the remote terminal and mark the diagram I posted with the circuit board designations from your amp to the corresponding parts on the diagram.
Through? It would very likely be driven by a 'driver' transistor. In both diagrams, you see an NPN transistor being driven by the remote and that NPN transistor drives a PNP transistor that sends 12v to pin 15 of the 3525.
Are you sure that you have the correct pin configuration for the transistors on the board? Look up all datasheets for the various transistors.
Are you sure that you have the correct pin configuration for the transistors on the board? Look up all datasheets for the various transistors.
It’s a MPSA56 and should be labeled as Q3 (it is on a spare XS2200 board and it’s on the XS6600 schematic so safe to assume its the same on the other XS models).
It is literally near the pin of 15 of the 3525, there will be two the NPN (A06) and then the PNP (A56) that Perry is asking you to check.
Looking at the picture you posted of the bottom of the board it looks like you already replace it before as it had new solder joints. So verify with schematic that the components you place back are the corresponding ones.
It is literally near the pin of 15 of the 3525, there will be two the NPN (A06) and then the PNP (A56) that Perry is asking you to check.
Looking at the picture you posted of the bottom of the board it looks like you already replace it before as it had new solder joints. So verify with schematic that the components you place back are the corresponding ones.
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That's a typical EF pair driver configuration except for the fact that the collector of the PNP driver should go to ground, not 12v.
Are you still getting negative voltage on pin 15?
Are you still getting negative voltage on pin 15?
The EF pair is going to the large capacitors near the transformers.
I am no longer getting negative voltage on pin 15. I am getting .2 volts on pin 15.
I am no longer getting negative voltage on pin 15. I am getting .2 volts on pin 15.
Without specifics, that means nothing. Which terminal of which transistor goes to which terminal of which capacitor? Reference to the components in the last PG diagram posted (as well as the designations for your amp).
On this amplifier (perhaps all XS from Phoenix Gold) have the secondary ground tied to the primary ground (no resistance/resistor) hence why the ground on the PWM IC was missing (it had secondary ground trace to primary ground open). The OP’s amp had several damage through hole vias, on the PWM IC buffers as well. On the XS4600 it doesn’t have a transistor/switch for Pin 15 of 3525, goes through 10K resistor then diode, so pin 15 should always have battery voltage present on the xs4600 (the XS6600 schematics I provided show the transistor with B+Switch. Also had damage through hole bias on all FOUR rail caps, so even when repairing the voltage issue for pin 15 and the open trace, it had bad rails (one side -45vdc while other was the expected 28vdc but the negative rail wasn’t present by the channels this is what caused me too look further into the traces that turned out to be open by capacitor leads/pins). Once the all rail through hole vias were repaired the amplifier had -/+28vdc rails and idle was now 1.5 instead of the 0.3a (when it had open vials on the rails caps). I was getting after I thought I repaired issue. Obviously not if the amp‘s idle is that low and no output signal.
Hope this can help others, thanks once again to Perry for taking his time and helping out.
Hope this can help others, thanks once again to Perry for taking his time and helping out.
Yes, thank you Perry for all the help. I realized I was in over my head so sent the Amp to evianamp2011 for repair. Thank you both for all your help, really appreciated!!
That amp would have been difficult to repair without a diagram, even moreso via a forum.
If pin 15 had constant 12v, how was the IC being switched on/off?
If pin 15 had constant 12v, how was the IC being switched on/off?