Pioneer Elite VSX-35TX, Service Manual

Page: 89 / 112

89
VSX-35TX, VSX-33TX
Front Side
Table 1
VR2621
VR2601
VR2621
VR2601
VR2521 VR2521
2531 2531
2551 2511 2551 2511
W432 W433 W441 W443 W432 W433 W441 W443
VR2541
VR2501
VR2541
VR2501
FRONT AMP
ASSY
Fig.1 Adjustment Points
J
REAR AMP
ASSY
K
6. ADJUSTMENT
IDLE CURRENT ADJUSTMENT
5
4 3
1
2
1
2
3
4
5
• CAUTION : Do not turn arround the adjustment Varriable resistors (VRs) fast !
If you go over the adjustment specification value too much. MOS-FET may be broken.
Steps
1. Decrease the level of the Adjustment Variable resistors (VR) for the channel to be adjusted. ( Turn counterclockwise.)
2. Set the power switch to ON.
3. First adjustment : Adjust VRs in following the step in table 1 and table 2.
4. Second adjustment : Adjust VRs in following the step in table 1 and table 2 that depends on aging time.
Step
No.
VR2601 SL ch
VR2621 SR ch
VR2501 FL ch
VR2541 C ch
VR2521
Between W441 and W443
Between W432 and W433
Between two terminal of 2511
Between two terminal of 2551
Between two terminal of 2531 FR ch
Adjustment Point Measurement Point Adjustment Channel
Table 2
00 : 00 - 01 : 30
07 : 00 - 08 : 59
09 : 00 - 11 : 59
12 : 00 - 14 : 59
15 : 00 -
First adjustment
Second adjustment
16.6mV
±
10% (16.6mV
±
1.6mV)
8.2mV
±
10% (8.2mV
±
0.8mV)
7.5mV
±
0.5mV
7.0mV
±
0.5mV
7.0mV
±
0.5mV
Adjustment Time Adjustment Value