Bl Drive Voltage Adjustment; Vcom Ac And Vcom Dc Coarse Adjustment - Casio QV-5500SX Service Manual & Parts List

3-3. BL drive voltage adjustment

Checking
Make sure that CP900 (BL-VCC) is 5.4 ± 0.2V.

3-4. VCOM AC and VCOM DC coarse adjustment

Adjustment
(1) Check if VCOM output (CP716) amplitude is 6.6± 0.3V.
(2) Adjust VR320 so that High level of VCOM output (CP716) becomes 4.8 ± 0.2V.
Power
Supply
L-PCB
VCOM
(PC716)
— 14 —
High level
4.8 [V]
0 [V]
–1.8 [V]
Oscilloscope