Adjustment - JVC RX-6042S Service Manual

4.1 Tuner section
4.1.1 Tuner range
FM : 87.5 MHz to 108.0 MHz
AM : 522 kHz to 1629 kHz
4.2 Power amplifier section
4.2.1 Adjustment of idling current
Measurement location : TP301
Adjustment part : VR301 (Lch) ,
Attention :
This adjustment does not obtain a correct adjustment value immediately after the amplifier is used (state that an internal 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 VR301 and VR302
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 TP301's
(Rch).
(5) Adjust the VR301 (Lch) and
• It is not abnormal though the idling current might not become 0mA even if it is finished to turn variable resistance (VR301, VR302)
in the direction of counterclockwise.
SECTION 4

ADJUSTMENT

(Lch) , TP302 (Rch)
VR302 (Rch)
fully counterclockwise to warm up before adjustment.
VR302 (Rch) so that the DC voltmeter indicates 2.0mV immediately after turning the power on.
B216 and B217 (Lch) and, connect it between TP302's
Front amp. board (L)
TP301
VR301
CN301
Front amp. board (R)
TP302
VR302
CN302
B218 and B219
VR301 (Lch)
TP301 (Lch)
VR302 (Rch)
TP302 (Rch)
(No.MB167)1-13