Originally Posted by Rajesh
Then it's a lot easier. Your 13V is stable . Your op-amp is fine . All you need to do is check Q14-Q17 . The fuse will blow only if this transistor shorts. Remember to change the driver transistor as well. Q13 & Q18 . The unit should be restored.
As a caution check these diodes D10-D13 . D-10 has a resistor in parallel so it will read 39 ohms. The other diodes are 1N4148,replace all 4 even if one is short. Good luck to you .
Ok, can I check Q14-Q17 while they are on the board, or do I need to remove them?