JVC TM-H1700G/E Service Manual page 27

Must be input the composite video signal for adjusting the white balance.
Set the aspect ratio to 4:3.
There are no requirement for adjustment in the under scan mode and RGB / component signal mode.
Item Test equipment
White Signal generator
Balance (Monoscope pattern)
(Low light)
adjustment
White Signal generator
Balance (Monoscope pattern)
(High light)
6500K Colour temperature
adjustment meter or Colour
Analyser
Adjustment
Test points
locations
SCREEN VR
[Lower knob :
in FBT]
W01 R CUTOFF
W02 G CUTOFF
W03 B CUTOFF
[SERVICE MENU]
W04 R DRIVE
W05 B DRIVE
[SERVICE MENU]
No.51922
Adjustment procedure
Under the condition that B1 voltage adjustment
has been finished.
1. Input the monoscope pattern signal.
2. Select the WHITE BALANCE BLOCK mode from
<BLOCK SELECT> screen.
3. Confirm the initial setting value of W01, W02,
W03 in the SERVICE MENU are 50.
4. Select the CUTOFF adjustment mode.
5. Press "SERV" switch to display the single
horizontal line. Carefully adjust the SCREEN VR
to horizontal line appears faintly, not to shine
much.
6. Gradually turn the SCREEN VR from the left to
the right direction to bring one of the red, green
and blue colours faintly visible.
7. Then select the CUTOFF switch (R, G or B) that
colour except for appears first, and adjusting 2
colours CUTOFF values by pressing the +key,
and make horizontal line visible white.
8. Readjust the SCREEN VR to appear the
horizontal line faintly, and cancel the horizontal
line to press the "SERV" switch.
Under the condition that Low light adjustment has
been correctly finished.
1. Input the monoscope pattern signal.
2. Select the WHITE BALANCE BLOCK mode from
<BLOCK SELECT> screen.
3. Select the 6500 DRIVE adjustment mode (High
light 6500 mode).
4. Apply the sensor of the colour temperature meter
to the CRT surface, portion of the 100% white,
adjust the W04 (R DRIVE) or W05 (B DRIVE) to
setting 6500K (x=0.313, y=0.329).
5. Exit the SERVICE MENU by pressing the "EXIT"
key.
6. Check the white balance tracking is finest when
CONTRAST and BRIGHT are up and down.
TM-H1700G
27