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4.1
Adjustment method
Tuner section
1. Tuner range
FM
87.5MHz to 108.0MHz
AM
530kHz to 1710kHz
Power amplifier section
Adjustment of idling current
Measurement location
B2204-82205
Adjustment part
VR787
Attention:
This adjustment does not obtain a correct adjustment value immediately after the amplifier is used (state that an in-
ternal temperature has risen). Please adjust immediately after using the amplifier after turning off the power supply of
the amplifier and falling an internal temperature.
<Adjustment method>
(1) Set the volume control to minimum during this adjustment. (No signal & No load)
(2) Set the surround mode OFF.
(3) Turn
VR787
and
If the heat sink is already warm from previous use the correct adjustment can not be made.
(4) For L-ch, connect a DC voltmeter between
(5) 30 minutes later after power on, adjust
• It is not abnormal though the idling current might not become 0mA even if it is finished to turn variable resistance (VR787,
VR788) in the direction of counterclockwise.
SECTION 4
ADJUSTMENT
(Lch),
B2213-B2214
(Lch),
VR788
(Rch)
VR788
fully counterclockwise to warm up before adjustment.
B2204
VR787
(Rch)
and
B2205
(Lch) and, connect it between
for Lch, or
VR788
for Rch so that the DC voltmeter value has 1mV to 10mV.
Front amp. board (L)
VR787
Front amp. board (R)
VR788
B2213
and
B2214
(Rch).
VR787 (Lch)
B2204, B2205 (Lch)
VR788 (Rch)
B2213, B2214 (Rch)
(No.MB172)1-13
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