Hi all, I finally found some time to play with another receiver. This will be Pioneer SX-650.
Original symptom was - relay clicking on and off.
- measured all power supply voltages - all correct
- measured all voltages to the power amp board - all correct
Right channel DC offset = 0.41V stable. Left channel DC offset is jumping up and down between 0 and ~1V. I can hear something shorting on the power amp board when relay clicks.
Measured voltages on 4 pins of the power pack in left channel:
* Pins 1/5 = +/- 36V
* Pins 2 and 6 - instead of +/- 1.2V , I have the same weird jumping DC on both pins (right channel is solid +/- 1.2V)
Would next step be breaking path(s) between 2SA798 and the SP-40W power pack?
Thank you.
Original symptom was - relay clicking on and off.
- measured all power supply voltages - all correct
- measured all voltages to the power amp board - all correct
Right channel DC offset = 0.41V stable. Left channel DC offset is jumping up and down between 0 and ~1V. I can hear something shorting on the power amp board when relay clicks.
Measured voltages on 4 pins of the power pack in left channel:
* Pins 1/5 = +/- 36V
* Pins 2 and 6 - instead of +/- 1.2V , I have the same weird jumping DC on both pins (right channel is solid +/- 1.2V)
Would next step be breaking path(s) between 2SA798 and the SP-40W power pack?
Thank you.