10. Main amp idling current adjustment
1)
With the power OFF, set semi - fixed resistor
R743
(Leh), R744 (Reh), R786 (Center ch}
on
the
PC
board (PV04} to the center position.
2) Connect a digital voltmeter, set for the
DC
range,
on the emitter resistor [R759 (Leh), R760
(Reh},
R794 (Center ch)]
on
the
PC
board (PV04).
3)
After the above, adjust the idling current
as
follows:
Turn the power
ON
and adjust semi - fixed resistor
R743 (Leh}, R744 (Reh}, R786 (Center
ch)
while
observing the digital multimeter indication.
The target value is 7.2
mV
(20
mA).
All values are with no load
on
speaker terminals, volume
set to minimum and
no
input with the unit switched
to
the
CD
position. Always allow the amplifier to stabilize for 10
minutes or longer prior to adjusting idle current.
11. Main amp DC offset adjustment
1)
With the power OFF, connect a digital voltmeter, set
for the
DC
range, to the speaker terminal.
2)
After the above, adjust the
DC
offset
as
follows:
Turn the power
ON
and adjust RN63 (Leh), RN64
(Reh}, RN70 (Center
ch)
so that the output
is
±20
mV.
(
(
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