Loose/spare capacitors to use as a load.
Are the signals more like what you expected with the calibrated probe?
Are the signals more like what you expected with the calibrated probe?
No. The cap has to be a very small value. not 1000uF, 1000pf. It would be a film or ceramic capacitor.
Hi All,
the amplifier was repaired and worked.
it turns on now and produces no output on the speaker terminal
I noticed the relay doesn't engage.
Rails are presents and I can see a signal on drains of the outputs
what would cause the relay not to engage?
the amplifier was repaired and worked.
it turns on now and produces no output on the speaker terminal
I noticed the relay doesn't engage.
Rails are presents and I can see a signal on drains of the outputs
what would cause the relay not to engage?
Do you have 12v across the coil of the relay?
If it's still in the heatsink, you can measure the voltage across the quenching diode that's across the coil if the diode is on the top of the board.
If it's still in the heatsink, you can measure the voltage across the quenching diode that's across the coil if the diode is on the top of the board.
If you have 12v across that diode, you either have broken solder connections on the relay or a bad relay.
Does the relay click when you get the 12v across the diode (a few seconds after applying remote voltage)?
Does the relay click when you get the 12v across the diode (a few seconds after applying remote voltage)?
Relay doesn't click when 12v is present across the diode when remote is applied.
Not sure if this is relevant, I get -12v when I place the multimeter black probe on cathode and red probe on anode.
I also applied 12v directly to the relay and it engages.
Not sure if this is relevant, I get -12v when I place the multimeter black probe on cathode and red probe on anode.
I also applied 12v directly to the relay and it engages.
The meter is simply reading the voltage with reversed polarity.
Confirm that you read 0 ohms between the diode terminals and the relay coil terminals.
Confirm that you read 0 ohms between the diode terminals and the relay coil terminals.
I do read 0 ohms between the anode and 1 relay terminal but no connection between the cathode and the other relay terminal
No visible traces for either of the coil terminals underneath the board, maybe located on the top of the board covered by the relay?
Can I run a jumper wire?
Can I run a jumper wire?
How confident are you that that diode is supposed to be connected to the relay coil?
Pull the relay (if you can without damaging the vias) to see if there is a trace.
Pull the relay (if you can without damaging the vias) to see if there is a trace.
Not very confident... I did remove the diode and there was no voltage on the anode pad (with remote applied), the cathode pad has B+ on it. the trace leads to a transistor (D600k), not sure if this would supply the 12v to engage the relay.