Hi all,
I'm working on this crossover, it powers on but there's no sound, i did some troubleshooting and found that there's no VCC to the opamps. There is -vcc present, I can't seem to pin point what is supplying the vcc.
Some pics:
I'm working on this crossover, it powers on but there's no sound, i did some troubleshooting and found that there's no VCC to the opamps. There is -vcc present, I can't seem to pin point what is supplying the vcc.
Some pics:
The supply voltage is generated by the switching power supply and rectified to DC via the 4 orange diodes.
Are you getting B+ and remote into the board, on the first components that their traces lead to?
Are you getting B+ and remote into the board, on the first components that their traces lead to?
Hi Perry,
yes, there is 11v on the remote and B+ traces....
i'm getting -11v on the outputs of those 4 diodes...
yes, there is 11v on the remote and B+ traces....
i'm getting -11v on the outputs of those 4 diodes...
The primary windings.
In many of these (generic) crossovers, the secondary is completely isolated and you must use the secondary center-tap as the reference (black probe) to measure the voltage on the op-amps.
In many of these (generic) crossovers, the secondary is completely isolated and you must use the secondary center-tap as the reference (black probe) to measure the voltage on the op-amps.
I get the supply voltage on the primary windings. No waveforms. Scope is grounded to negative terminal of the psu.
I've replaced Q2,Q3 - C9014, with 2N3904 thats what i found in my stock.
Now i get the squarewaves and I see the vcc on the opamps but still no sound
Now i get the squarewaves and I see the vcc on the opamps but still no sound
If there are no bad connections on the RCAs, my guess would be a dirty switch or pot. Have you listened to it while working all controls through their entire range to see if anything ever played through?
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