Sherwood RD-6405R A/V receiver issues - diyAudio
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Old 6th November 2007, 12:27 PM   #1
h3ad is offline h3ad  Australia
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Join Date: Sep 2007
Unhappy Sherwood RD-6405R A/V receiver issues

hi,

recently i was given 2 Sherwood RD-6405R's to fix, and my friend only wants 1 back, as the DAC and transformer and variouse other parts from the 2nd amp will be good for other projects...

1ch in one of them was blown (shorted output transistors) and 3 in the other were blown (also shorted, so i decided to just remove a "good" pair of transistors from the "more blown" amplifer and replace that single channel...

well... the amp now turns on and stays on without protecting... and plays music quite well thru 4 channels... the 5th still doesnt work. all i get is the odd little crackle and if i turn it up 2 any reasonable volume the amp protects.
IF i dont plug a speaker into that channel the amp works quite happily and does not protect...

i have tried 2 different sets of transistors (the same pairs of course lol) and it just keeps doing the same thing.
if it is any help the transistors are "D2390/B1560" and i measured a DCV of 56-0-56
Any help would be really appreciated


Haydn
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Old 12th November 2007, 05:32 AM   #2
h3ad is offline h3ad  Australia
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Default all good now

all is good now... had 2 replace a few 4R7 and .5R
the resistors looked fine but they were open circuit :S
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