Tint Adjustment - Casio QV-3500EX Service Manual & Parts Catalogue

4-6. TINT adjustment

1. Adjustment procedure
• Make sure
(CP344) = 5.0 ± 0.05 [V]
VCC5
(CP391) = 15.0 ± 0.45 [V]
VCC15
(CP390) = 8.0 ± 0.05 [V]
VCC7
(CP220) = 3.3 ± 0.08 [V]
VCC3
• Perform this adjustment after Contrast adjustment.
2. Preparation
• AC adaptor or voltage regulator
• Frequency counter
3. Adjustment and checking
(1) Turn the power on while pressing SHIFT and MENU keys simultaneously. (TEST MODE)
(2) Push SHIFT
(3) Select and execute COLOR BAR.
(4) Trigger with FRP (CP305) signal.
(5) Adjust VR301 so that potential difference between the 2nd and 4th pulses' height (pedestal-peak) (A
and B) of VB waveform (CP324) is less than 0.1Vp-p.
4. Note
Perform the adjustment after (continuously from) Color adjustment.
Power
Supply
SHIFT MENU keys in order rapidly. (TEST MODE 1)
QV-3500EX
D-PCB
VCC15
(CP391)
VCC5
(CP344)
VCC7
(CP390)
VCC3
(CP220)
VB(CP324)
A
— 27 —
Digital oscilloscope
1 2 3 4
B