Amp Adjustment; Confirmation Of Idling Current Of Main Amplifier - Yamaha RX-V496 Service Manual

RX-V496/RX-V496RDS/HTR-5240/HTR-5240RDS

AMP ADJUSTMENT

Confirmation of Idling Current of Main Amplifier

•
Right after power is turned on, confirm that the voltage across the
terminals of R239(Main Lch),R245(Main Rch), R262(Center),
R252(Rear Lch), R258(Rear Rch) are between 0.1mV and 5.0mV.
•
If it exceeds 5.0mV, open (cut off) R213 (Main Lch), R218 (Main
Rch), R233 (Center), R223 (Rear Lch), R228 (Rear Rch) and
reconfirm the voltage.
•
Confirm that the voltage is 0.25mV ~ 15.0mV after 60 minutes.
R262
R258
MAIN (1)
R252
R245
R218
R239
R213
21 Front Panel
R233
Q214
R228
Q211
R223
Q208
Q205
OPE (5)
Q202
0.1mV ~ 5.0mV
(DC)
R239(Lch)
R245(Rch)
R262(Cch)
R252(RLch)
R258(RRch)
Cut off
R213(Lch)
R218(Rch)
R233(Cch)
R223(RLch)
R228(RRch)
Note)
• If R213, R218, R233, R223 and R228
have already been cut off and idling
current does not flow, reconnect R213,
R218,R233,R223 and R228.
• Q202,Q205,Q208,Q211 and Q214 are
transistors for temperature correction.
Apply silicone grease to contact sur-
face with the heat sink.