Hey all,
Got my hands on Pioneer GM-D8601.
Someone else tried to repair it before me but didnt succeed. Originally it had both psu and output blown. New fets have been fitted along with buffer transistors and drive ic. Psu section runs well but the output is problematic.
When CSD cap is installed it swings back and forth between protection. When i remove the cap amp powers up, output starts switching, draws excessive current and fets heat up, also there's ~2V dc offset on output terminals. I did my best probing all the smd transistors and diodes near the drive ic but cant find anything wrong. Drive wave looks a bit off but for me the switching frequency looks a bit high? Also when i have my rca connected i dont seem to have any signal on pin 3(in) of IRS2092.
Anyone have any ideas of what to check next?
Thanks.
Got my hands on Pioneer GM-D8601.
Someone else tried to repair it before me but didnt succeed. Originally it had both psu and output blown. New fets have been fitted along with buffer transistors and drive ic. Psu section runs well but the output is problematic.
When CSD cap is installed it swings back and forth between protection. When i remove the cap amp powers up, output starts switching, draws excessive current and fets heat up, also there's ~2V dc offset on output terminals. I did my best probing all the smd transistors and diodes near the drive ic but cant find anything wrong. Drive wave looks a bit off but for me the switching frequency looks a bit high? Also when i have my rca connected i dont seem to have any signal on pin 3(in) of IRS2092.
Anyone have any ideas of what to check next?
Thanks.
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