Pioneer SX-315, Service Manual

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SX-315
42
1 2 3 4
1 2 3 4
C
D
F
A
B
E
6. ADJUSTMENT
6.1 IDLE ADJUSTMENT
Purpose : If the one of the following TR (Transistor) is replaced, this adjustment is required.
Q206, Q207, Q519-Q522, Q527-Q530, Q538 and Q539
Equipment : Digital voltmeter
Idle Current Adjustment
1. Fully turn the adjustment VR counterclockwise.
2. Connect a digital voltmeter to both ends of resistor of the measurement point. (TP1 - TP6)
3. Turn on the power, and perform aging for more than one minute.
4. Slowly turn the adjustment VR clockwise so that the voltage becomes in the range of 2.5mV
±
0.5mV.
Adjustment Name Adjustment VR Measurement Points
Front L ch VR501 (MAIN Assy) TP1 (R621)
Front R ch VR502 (MAIN Assy) TP2 (R622)
Surround L ch VR503 (MAIN Assy) TP3 (R643)
Surround R ch VR504 (MAIN Assy) TP4 (R644)
Center ch VR505 (MAIN Assy) TP5 (R664)
SubWoofer ch VR201 (SW AMP Assy) TP6 (R621)
Procedure
Adjustment Points
MAIN ASSY
SIDE A
A
SW AMP ASSY
H
SIDE A
TP6 VR201
TP1
VR501
TP4
VR504
TP5
VR505
TP3
VR503
TP2
VR502