groenhen
Active Member
Hi,
Just got a SA7800 from ebay...
Problem is : one channel is not working,,, probably was fried.
Primary investigation reveals this on board GWH-118:
- power transistors both dead. 2SA1075 and 2SC2525. What should I buy as replacement from mouser?
- 2SA913 and 2SC1913 (Q23 and Q26 I think - hard to read the marks). What should I buy as replacement from mouser?
- R33 (560 ohm) is scorched
- R57 (150 ohm) 0.5Watt is scorched
- R59? (150 ohm) 0.5watt is scorched.
What could have happened?...
And more important: if I replace all these transistors with new ones from mouser, should I change some other components too? I mean the resistors values will remain the same as in original schematics?
Please help, I really want to bring this amp back to life!
Bare with me, I'm a sw programmer but I like electronics too
TIA,
Stanley.
Just got a SA7800 from ebay...
Problem is : one channel is not working,,, probably was fried.
Primary investigation reveals this on board GWH-118:
- power transistors both dead. 2SA1075 and 2SC2525. What should I buy as replacement from mouser?
- 2SA913 and 2SC1913 (Q23 and Q26 I think - hard to read the marks). What should I buy as replacement from mouser?
- R33 (560 ohm) is scorched
- R57 (150 ohm) 0.5Watt is scorched
- R59? (150 ohm) 0.5watt is scorched.
What could have happened?...
And more important: if I replace all these transistors with new ones from mouser, should I change some other components too? I mean the resistors values will remain the same as in original schematics?
Please help, I really want to bring this amp back to life!
Bare with me, I'm a sw programmer but I like electronics too
TIA,
Stanley.