Casio TV-M430S, Руководство по обслуживанию и список запасных частей

Страница: 7 / 21

— 5 —
Adjustment procedures
1. VCC2 adjustment, VCC9, VCC8, VCC7, VCC5, VEE1, VDD, VCC1-2 voltage check
•
Condition
Power supply: VCC1-1(P105) = 13.50
±
0.05 [V]
•
Adjustment
Apply 13.50
±
0.05 [V] on VCC1-1(P105).
Adjust VR101 so that VCC2 (P154) voltage becomes 5.00
±
0.05 [V].
As the dummy load, connect the following.
VCC2 (P154) to GND = 1.3 K
Ω
VCC5 (P152) to GND = 22 K
Ω
VEE1 (P155) to GND = 150 K
Ω
•
Checking
VCC9 (P141) = 7.8
±
0.3 [V]
VCC8 (P131) = 7.8
±
0.3 [V]
VCC7 (P151) = 30.0
±
2.0 [V]
VCC5 (P152) = 13.5
±
1.0 [V]
VEE1 (P155) = –15.0
±
1.0 [V]
VDD (P171) = 3.0
±
0.1 [V]
VCC1-2 (P181) = 9.0
±
0.3 [V]
•
Block diagram
V
Digital
Voltmeter
L-PCB
Stabilizer
VCC1-1
VCC9
VCC8
VCC7
VCC5
VCC2
VEE1
VDD
22K
Ω
150K
Ω
1.3K
Ω
VCC1-2