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Yamaha C-2 component leak

TR411 has 7v on the collector and TR412 has .1 v on the base-- need .6v at least to bias on TR412 .. Don't make since.. Unless you have another crack in the board. Or another error in the drawing.
 
avionic said:
TR411 has 7v on the collector and TR412 has .1 v on the base-- need .6v at least to bias on TR412 .. Don't make since.. Unless you have another crack in the board. Or another error in the drawing.
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Did you check if you had a C2 Power Supply board?
 
I have a C-2a carcass.. I have a serviceable C-2 Control amplifier..
 
D403, 404, 407, 408, 414
Marked on schematic as WZ061
Actually installed 4786

WZ061 = 6.0v
4786 = 4.0v ?
 
I pulled the Power On/Off switch and found the primary contact was vaporized.

The L1/L2 M1/M2 section of the switch was not so bad, I did go ahead and clean it.
 
D403, 404, 407, 408, 414
Marked on schematic as WZ061
Actually installed 4786

WZ061 = 6.0v
4786 = 4.0v ?

771-NZX3V9C,133 possible replacement?
 
Have you attempted to check the continuity of all the power supply traces on that printed circuit board. If this is the board that was cracked.
 
What did you replace TR401 and 402 with ? Or did you replace them ?
 
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