Place your probes on pads 5 and 8 for U407. Power the amp up for only long enough to get a voltage reading. What is the DC voltage?
I placed my probes on pads 5 and 8 for U407 and turned the amplifier on.
The irf540 immediately blow with a spark.
At this moment i am waiting at all the broken parts and i want to replace every semiconductor around the optocouplers and the irf540.
The irf540 immediately blow with a spark.
At this moment i am waiting at all the broken parts and i want to replace every semiconductor around the optocouplers and the irf540.
Today i replaced the irf540 and the including the semi conductors, i also replaced the 2 optocouplers and the semiconducters.
I didn`t short the pins 6 and 7 to pin 5 of the optocoupler.
I turned onn the amplifier with a 12v adaptor.
This time no parts where smoking after turning the amplifier on.
But the Led light at location Led400 nearby the optocoupler turned onn.
Do i have to short the pins of the optocoupler?
I didn`t short the pins 6 and 7 to pin 5 of the optocoupler.
I turned onn the amplifier with a 12v adaptor.
This time no parts where smoking after turning the amplifier on.
But the Led light at location Led400 nearby the optocoupler turned onn.
Do i have to short the pins of the optocoupler?
You only short the opto-coupler pads when the amp is going to be powered up with the opto-couplers out of the circuit.
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