Hello:
Several months ago I did a full recap, etc... of this receiver replacing all parts shown in the main sx-1250 restoration thread. The receiver played wonderfully for 3-4 months....probably 10 hours of playing. Then it blew fuses 1 and 2 on the AWR-107 Board. Replacing fuses and powering on from DBT indicated a short. I had suspected issues with the Stabilizer Board so I obtained one, rebuilt it and turned on with DBT and no more short. Went to adjust voltages on stabilizer board and was able to get 65 volts on pin 17. Pin 16 wouldn't move beyond 3V +-. Voltages on pins 9 10 and 8 on that board all check out fine.
Looking further I noticed I didn't hear the relay click on. I also found +1.3V at PIN 14 on the stabilizer board which also impacted reading on pin 2 of the flat amp board and 3 of the protection board. I wonder if the previous short caused an issue on one of these boards.
I might be asking this the wrong way but should the -25V that I should be seeing originate from the protection board? I'm trying to figure out why I'm not getting voltage there and then proceed.
Any thoughts would be greatly appreciated. Thanks.
Several months ago I did a full recap, etc... of this receiver replacing all parts shown in the main sx-1250 restoration thread. The receiver played wonderfully for 3-4 months....probably 10 hours of playing. Then it blew fuses 1 and 2 on the AWR-107 Board. Replacing fuses and powering on from DBT indicated a short. I had suspected issues with the Stabilizer Board so I obtained one, rebuilt it and turned on with DBT and no more short. Went to adjust voltages on stabilizer board and was able to get 65 volts on pin 17. Pin 16 wouldn't move beyond 3V +-. Voltages on pins 9 10 and 8 on that board all check out fine.
Looking further I noticed I didn't hear the relay click on. I also found +1.3V at PIN 14 on the stabilizer board which also impacted reading on pin 2 of the flat amp board and 3 of the protection board. I wonder if the previous short caused an issue on one of these boards.
I might be asking this the wrong way but should the -25V that I should be seeing originate from the protection board? I'm trying to figure out why I'm not getting voltage there and then proceed.
Any thoughts would be greatly appreciated. Thanks.