Hello Guys
I am currently trying to repair a SONY STR-DE597 6.1 receiver, which does the following trouble:
All of it's channels work, but with strong differences in output gain...
when i generate the test tone white noise, from what i hear:
surround BACK = 100%
CENTER = 100%
Front Left = 35%
front right = 20%
Surround Left = 45%
Surround Right = 100 %
the SUB output works OK
is it right to assume that if any output transistors were blown, nothing would be heard from those channels? (MN2488 and MP1620)
Each channel has 4 output transistors and i have all identified them... each channel has the same set. Would it be logical to remove a set from say, the surround right channel (which works 100%) and exchange the set with one of the lower output channels (like front right), to see if the problem follows the transistor set? (or maybe i should only move the two MN2488 and MP1620??)
I don't have signal tracing equipment available, so i am just looking for a way to save this one before ordering transistors or putting the amp to the trash...
i have done a factory reset on it, with no change.
can anyone suggest where else to look for such a problem??
THANKS, any suggestions are welcome.
Pierre D
I am currently trying to repair a SONY STR-DE597 6.1 receiver, which does the following trouble:
All of it's channels work, but with strong differences in output gain...
when i generate the test tone white noise, from what i hear:
surround BACK = 100%
CENTER = 100%
Front Left = 35%
front right = 20%
Surround Left = 45%
Surround Right = 100 %
the SUB output works OK
is it right to assume that if any output transistors were blown, nothing would be heard from those channels? (MN2488 and MP1620)
Each channel has 4 output transistors and i have all identified them... each channel has the same set. Would it be logical to remove a set from say, the surround right channel (which works 100%) and exchange the set with one of the lower output channels (like front right), to see if the problem follows the transistor set? (or maybe i should only move the two MN2488 and MP1620??)
I don't have signal tracing equipment available, so i am just looking for a way to save this one before ordering transistors or putting the amp to the trash...
i have done a factory reset on it, with no change.
can anyone suggest where else to look for such a problem??
THANKS, any suggestions are welcome.
Pierre D