Adjustments - Yamaha DSP-E800 Service Manual

DSP-E800

ADJUSTMENTS

Confirmation of Idling Current
1) No signal applied.
2) Non-loaded condition.
3) Aging is not neccessary.
Test Point
Item
CB103
REAR L
R161 or R163
REAR R
R167 or R169
CENTER
*
Confirm that the voltage is 0.12—7.5mV after 60 minutes.
Note)
•
If R133 (RL ch), R142 (RR ch) or R150 (C ch) have already been cut
off and idling current does not flow, reconnect R133 (470Ω), R142
(470Ω) or R150 (470Ω).
•
Q107, Q109 and Q111 are transistors for temperature compensation.
Apply silicone grease to the contact surface with the heat sink.
CB103
5
Rating (DC)
If the measured voltage exceeds 5.1mV, cut the
lead wire of R133(RL ch), R142(RR ch) or R150(C
0.1mV—5mV
ch) and then check again if each measured value
satisfies the rating.
R161
R163
Q109
R142
R167
R169
R150
Q111
R133
Q107
Note
R133 (RL ch)
R142 (RR ch)
R150 (C ch)
Cut
0.1mV — 5mV (DC)
CB103 (RL ch)
0.1mV — 5mV (DC)
R161 or R163 (RR ch)
R167 or R169 (C ch)