Adjustment Procedures; Power Amplifier Idling Adjustment - JVC AX-R551BK Service Manual

Adjustment Procedures
• Power Amplifier Idling Adjustment
r
I
Left Channel
R751
t@t
(+1 (-I
00
r
1. Before tuning on the power, turn the semi-fixed
resistors (R7 51 for L channel and R752 for R channel)
of the power amplifier circuit board fully
co unterc loc kwise.
2. Adjust the semi-fixed resistors R751 (for L channel)
and R7 5 2 (for R channel) so that the voltage between
test points
®
and
®
of R787 (L channel) and between
test point
©
and @ of R788 (R channel) becomes
I
J
R788
:1J
l
Right Channel
R75Z
t@t
(+)
(-I
AX-R551 BK
5 mV, about 10 minutes after the power is turned on.
Confirm that the voltage does not vary when the
heatsink temperature increases further.
Note: Be sure to perform the measurement with the
probes and cabinet of the measuring equipment
separated from the grounding terminals ofAX-
R551 BK or other measuring equipment.
(No. 20016) 1-31