Yamaha ax 900 schematic
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Extracted text from yamaha ax 900 schematic (Ocr-read)
Page 2
Note) * marked
\ R u, c 5 A G, a
c357, 3e ,364 OPEN OPEN \ OPEN _ 0.01
c359 ~ 362 OPEN OPEN \ OPEN 5? HOOP/100
3419, 420 -* OPEN OPEN 1 OPEN 47
F302 T5.0A 250v OPEN 5 OPEN OPEN
Lapping Terminal SET NONSET 1 NONSET NONSET
K1666 ~669 OPEN OPEN SHORT SHORT
Jase ~599 OPEN OPEN SHORT SHORT
Main Circuit Board (Bil
PHONES
FROMzMAINH )VLU
it Main amplifier operation check
To check the waveform Of the Output (speaker), remove the diode 0312
first. (This will prevent muting transistors 0105 to 108 from operating as
far as the relay»ON step.) Then using the AC regulators, appiy
graduaHv and observe the waveform.
WaiiLCircuit Board (2?
FROM I VOLTAGE
SELECTOR
FROM: MAINH)
voltage
* ®
SPEAKERS
L
4,
FROM 2 MAINH)
SPEAKERS
A B