L-Pcb Assy; Vcc18, Vcc15, Vee7 Voltage Adjustment - Casio QV-5000SX Service Manual & Parts List

3. L-PCB Assy

3-1. VCC18, VCC15, VEE7 voltage adjustment

• Make sure VCC1-1 (CP149) = 5.0 ± 0.05 [V]
• Apply 3.3 V ± 5 % to PW0 to PW3.
(1) Apply 5.0 ± 0.05 V to VCC1-1 and adjust VR120 so that VCC18 (CP121) becomes 18.5 ± 0.5 V.
(2) Adjust VR125 so that VCC15 (CP125) becomes 15.0 ± 0.2 V.
(3) Adjust VR130 so that VEE7 (CP133) becomes –9.0 ± 0.2 V.
Note: Adjust VCC15 after adjusting VCC18.
Power
Supply
VCC1-L
3.3 V
PW~3
— 15 —
VCC18
L-PCB
VCC15
VEE7
V