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#1
06-13-2017, 10:01 PM
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Somebody plugged the boards together while powered up or mis-indexed them somehow. I've see that on the T922 scopes. Eats a resistor, and melts a transistor, IIRC. Pull the board, and do a junction check on all transistors - diode function on your DMM should do the job. On the power supply board, lift the base of each transistor before testing, as the low impedances/resistances on the board will give false readings.
Or open up another and cannibalize to make one good scope...
__________________
Brian USN RET (Avionics / Cal) CET- Consumer Repair and Avionics ('88) "Capacitor Cosmetologist since '79" When fuses go to work, they quit! 
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