High-Voltage Adjustment; Focus Adjustment - JVC DT-V1710CG Service Manual

4.10.4 HIGH-VOLTAGE ADJUSTMENT

HIGH-VOLTAGE ADJUSTMENT
Measuring Instruments
Card (Slot)
Test Points
Adjustment Points
Note: Perform the following adjustments after completing the Screen Voltage Coarse adjustment and X-Ray Protector
adjustment.
(1) Turn the VR502 fully clockwise.
(2) Set the CONTRAST and BRIGHT potentiometers on the front panel to the fully clockwise positions.
(3) Connect the high-voltage voltmeter to the anode of the CRT and turn the unit ON.
(4) Apply the 1080/60i all-black signal to INPUT A (Terminal Y on the Component/RGB Input Card).
(5) If the raster is visible, adjust the BRIGHT potentiometer on the front panel to turn the screen all black.
(6) Turn the VR502 slowly counterclockwise until the value of the high voltage is 25 kV ± 0.2 kV.
(7) Apply adhesive for fixing the VR502 in the adjusted position.
(8) Set the CONTRAST and BRIGHT potentiometers on the front panel to the center click positions.
S. CORRECTION PWB
MAIN PWB

4.10.5 FOCUS ADJUSTMENT

FOCUS ADJUSTMENT
Measur Instruments
Card (Slot)
Test Points
Adjustment Points
Note: Perform the following adjustments after completing the Screen Voltage Coarse adjustment , X-Ray Protector and
High-Voltage adjustments.
(1) Apply the 1080/60i crosshatch signal to INPUT A (Terminal Y on the Component/RGB Input Card).
(2) Set the CONTRAST and BRIGHT potentiometers on the front panel to the center click positions.
(3) Adjust the FOCUS VR1 and VR2 so that the horizontal and vertical lines in the image are clearly visible.
Signal generator (All-black signal)
High-voltage voltmeter
Component/RGB Input Card (Slot 1)
Anode of CRT
VR502 (High-Voltage VR) [S. CORRECTION PWB]
TP-XR
TP-G
Front side
Signal generator (Crosshatch signal)
Component/RGB Input Card (Slot 1)
FOCUS VR1 [Top potentiometer on high-voltage transformer]
FOCUS VR2 [Middle potentiometer on high-voltage transformer]
(Top surface view of S. CORRECTION PWB)
VR502
VR501
(Min)
(Max) (Min)
Front side
(Max)
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