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!
|