Hello all, newbie here who created their own issue - shorted the wrong pins when connecting meter to set bias. When I did this a pop happened and all the sudden the 180ohm R58 resistor went glowing red. I have 180 ohm resistors to replace this one, however I’m wondering if this is a protection type resistor that stopped further damage. The four main transistors on the power amp board all seem to check out fine and do not seem to be shorted. I see no other evidence (visually) of any other burnt up resistors, just this one.
any advice you can give I would greatly appreciate it. I’m including a pic of the board showing that resistor and a copy of the service manual if needed.
This will be powered back up with dim bulb tester in line next time as well
any advice you can give I would greatly appreciate it. I’m including a pic of the board showing that resistor and a copy of the service manual if needed.
This will be powered back up with dim bulb tester in line next time as well
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R58 glowing red would suggest that Qe18 or Qe22 (not on that board) may be shorted.
Can your ohm-meter check the forward voltage of a diode?
If so, check the forward voltage for the B-E and B-C junctions of each transistor, including Qe22 and Qe24 (also check resistance between C and E).
Can your ohm-meter check the forward voltage of a diode?
If so, check the forward voltage for the B-E and B-C junctions of each transistor, including Qe22 and Qe24 (also check resistance between C and E).
