so all the output transistors test ok "out of circuit"?
junction testing in circuit won't tell you anything or find the shorted device(s)
junction testing in circuit won't tell you anything or find the shorted device(s)
Hello i am a bit confused tell me what you mean
and how to check the -92v
also all the output transistors are pefeect but i found maybe a issue with
tr113
and how to check the -92v
also all the output transistors are pefeect but i found maybe a issue with
tr113
"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.
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.
i'm confused too as the max rail voltage is 80 volts but the point djk is making is valid.
the page references is that "pdf" or "original" document page numbers?
tr113 is in the driver/bias stage
the page references is that "pdf" or "original" document page numbers?
tr113 is in the driver/bias stage
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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
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
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
Best Regards
Juan
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" there is a weird circuit that needs 13V AC?"
Yes, it is used to generate the -92V for the front end.
Yes, it is used to generate the -92V for the front end.
thank you so much djk I was able to used on the simulation and I measure those
-91.3V really close to the original schematic anotation and respond really well I think 230W and good low THD 🙂
Best Regards
Juan
-91.3V really close to the original schematic anotation and respond really well I think 230W and good low THD 🙂
Best Regards
Juan
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