Hi there,
I recapped a 950 about 2 years ago and it was working great until recently, and now it won't come out of protection.
Below are my measured voltages for the protection and power supply boards.
Pins 1,3,5,6,7,8 on the protection board seem suspicious so I measured Q4 and Q5, and the collector on Q4 was reading 17.38 instead of the specified -0.6.
It's been a while since I worked through a schematic, anyone have any suggestions for what went wrong or what to measure next? Thanks
Protection
1 = -0.01
2 = -13.87
3 = -0.01
4 = 0
5 = - 0.02
6 = 0
7 = 0
8 = -0.02
9 = 20.74
10 = 34.42
11 = 34.42
12 = 8.09 AC
Power Supply
1 = 0
2 = 6.16
3 = 6.13
4 = 13.83
5 = 13.83
6 = 50.4
7 = 50.4
8 = 34.38
9 = 34.40
10 = 34.40
11 = 26.52
12 = 0
13 = -13.87
14 = -53.6
15 = -19.9
16 = 37.8 AC
17= -49.9
18 = 50.0
19 = 37.8 AC
20 = 0
21 = 0
22 = 8.10 AC
23 = 8.09 AC
24 = 8.24 AC
25 = 48.6 AC
26 = 48.6 AC
27 = 20.3 AC
28 = 20.3 AC
I recapped a 950 about 2 years ago and it was working great until recently, and now it won't come out of protection.
Below are my measured voltages for the protection and power supply boards.
Pins 1,3,5,6,7,8 on the protection board seem suspicious so I measured Q4 and Q5, and the collector on Q4 was reading 17.38 instead of the specified -0.6.
It's been a while since I worked through a schematic, anyone have any suggestions for what went wrong or what to measure next? Thanks
Protection
1 = -0.01
2 = -13.87
3 = -0.01
4 = 0
5 = - 0.02
6 = 0
7 = 0
8 = -0.02
9 = 20.74
10 = 34.42
11 = 34.42
12 = 8.09 AC
Power Supply
1 = 0
2 = 6.16
3 = 6.13
4 = 13.83
5 = 13.83
6 = 50.4
7 = 50.4
8 = 34.38
9 = 34.40
10 = 34.40
11 = 26.52
12 = 0
13 = -13.87
14 = -53.6
15 = -19.9
16 = 37.8 AC
17= -49.9
18 = 50.0
19 = 37.8 AC
20 = 0
21 = 0
22 = 8.10 AC
23 = 8.09 AC
24 = 8.24 AC
25 = 48.6 AC
26 = 48.6 AC
27 = 20.3 AC
28 = 20.3 AC