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Denon PMA 560 blown output transistor
Denon PMA 560 blown output transistor
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Old 2nd April 2011, 01:14 PM   #1
Vladislav is offline Vladislav  Poland
diyAudio Member
Join Date: Apr 2011
Location: Cracow
Unhappy Denon PMA 560 blown output transistor

I ruined my PMA 560. By accident it runned 10 minutes with very low impedance load in one channel (by mistake I made short circuit at woofer in DIY loudspeaker) and then there was some smoke.
I looked inside and one of output transistors in left channel (2SA1491 - TR529) looks broken but other element doesn't look smoked or fried at all.
Will it be enough if I replace output and driver transistors (TR527, TR529, TR519, TR521)? Is it possible that more elemets is damaged? I have some experience in replacing elements but not in looking for damaged elements Should I check other transistors or diodes, resistors by taking it out and checking with multimeter? What else could be damaged except those four transistors in this situation?
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