CrispySqrl
New Member
Hello all this is my first post on here but it's gonna be a good one. I have been trying to fix a friends SA-9100 protect light we found some bad capacitors on the power board so we ended up recapping the the power b board and the protect board as well as replacing the transistors on both. After that the protect light still wouldn't go off. So we did voltage checks again and it lead me to believe the output transistors on the right channel were bad. So we ordered the MJ21193G and MJ21194G to replace them. Unfortunately the protect light is still on so we took some new voltage readings and am hoping that someone here can help.
Protect board (AWM-025)
1: -2.2v fluctuating
2: -12.77
3: 38.20
4: ground
5: -2.2 fluctuating
6: -2.2 fluctuating
7: 38.30
8: 32.00
9: 35.80
10: 35.80
11: 35.80
12:7.44 AC
Power B board (AWR-032)
1: ground
2:-21.62
3: -32.97
4: -12.82
5: -55.72
6: -56.84
7: 56.62
8: 43.74
9: 35.88
10: 24.87
11: 15.99
Right Power amp unit (AWH-023)
15: 31.70
16: -43.22
17: 28.95
18: 37.94
19: 43.10
20: 38.39
Left Power amp unit (AWH-023)
15: -2.2 fluctuating
16: -43.17
17: -2.2 fluctuating
18: -2.2 fluctuating
19: 43.06
20: -1.0 fluctuating
If there are any other test to run please let me know. I am pretty sure the problem is with the right power amp.
Thank you in advance,
Darrell
Protect board (AWM-025)
1: -2.2v fluctuating
2: -12.77
3: 38.20
4: ground
5: -2.2 fluctuating
6: -2.2 fluctuating
7: 38.30
8: 32.00
9: 35.80
10: 35.80
11: 35.80
12:7.44 AC
Power B board (AWR-032)
1: ground
2:-21.62
3: -32.97
4: -12.82
5: -55.72
6: -56.84
7: 56.62
8: 43.74
9: 35.88
10: 24.87
11: 15.99
Right Power amp unit (AWH-023)
15: 31.70
16: -43.22
17: 28.95
18: 37.94
19: 43.10
20: 38.39
Left Power amp unit (AWH-023)
15: -2.2 fluctuating
16: -43.17
17: -2.2 fluctuating
18: -2.2 fluctuating
19: 43.06
20: -1.0 fluctuating
If there are any other test to run please let me know. I am pretty sure the problem is with the right power amp.
Thank you in advance,
Darrell