Yamaha P2200 DC offset

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djk

djk

R.I.P
Joined 2001
"Hello i am a bit confused tell me what you mean
and how to check the -92v "

With a voltmeter.

See pg 19 of the manual. If R134 is open, or F101 is open (location of both shown on pg 17), there will be no -92V, and the output of the amplifier will stick to the positive rail.
 
R

Robbie44

Member
Joined 2011
Hello '
ok F101 is ok and R134 is a 100ohm resister and i lifted it and it tested fine
but when i tested the unit it showing 94 or 93.8 on A & B Channels
and still 79.3 + to the outputs i also checked all the output transistors
out of the unit and all Checked out..... but i am baffled what do you think could it be the
note Bias CT- PE 0000 on both channels
Robert
 
vargasmongo3435

vargasmongo3435

Member
Joined 2011
Hello guys I have a PCB that a friend of mine did first and I'm doing a re-redrawing of the Yamaha P2200 I already did a simulation on multisim and I think does respond really well but there is a weird circuit that needs 13V AC?, on the simulation I do not simulated with that option can some one give me some information about what it does to the amplifier funtionality any info I will appreciated

Best Regards
Juan
 
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