Focus Adjustment; White Balance Adjustment; Screen Voltage Adjustment - Sony TRINITRON BVM-8045QD Operation And Maintenance Manual

3-5. FOCUS ADJUSTMENT

1. Receive the monoscope signal.
2. Set the CONTR control to normal.
3. Adjust the FOCUS control of the FBT so that the focus
at the center of CRT screen and around the CRT screen
become optimum.
FBT
Fig. 3-14

3-6. WHITE BALANCE ADJUSTMENT

3-6-1. Screen Voltage Adjustment

1. Receive the dot signal.
2. Connect a digital voltmeter to pin 5 (KG) of CRT
socket. Adjust RV119 (G C/O) on the B board so that
the voltage is 103 Vdc.
3. Connect a digital voltmeter to pin 9 (KB) of CRT
socket. Adjust RV121 (B C/O) on the B board so that
the voltage is 103 Vdc.
4. Adjust the SCREEN control of the FBT to the position
where just before the flyback line disappears from the
CRT screen.
FBT
SCREEN
Fig. 3-15
MIC
S Chassis
3-6-2. White Balance Adjustment
1. Receive the color bars signal. (Set the BURST switch
of the test signal generator to OFF.)
2. Set the following controls on the front panel as follows:
BRIGHT
CONTR
BIAS (Front panel)
GAIN (Front panel)
3. Adjust RV118 (SUB BRT) on the B board so that the
blue stripe portion on the color bars signal is bright
dimly.
FOCUS
4. Receive the white signal. (Set the BURST switch of the
test signal generator to OFF.)
5. Set the CONTR control to 90 degrees clockwise from
the center position.
6. Using the luminance meter, adjust the luminance level
of the CRT screen so that it is 3 Nit. (Screen is bright
dimly.)
7. Adjust the white balance of the cut-off with RV119 (G
C/O) and RV121 (B C/O) on the B board.
8. Set the luminance level of white signal to 100 IRE with
test signal generator.
9. Adjust the white balance of the high-light with RV120
(G GAIN) and RV122 (B GAIN) on the B board.
10. Press the BLUE ONLY switch on the front panel.
11. Adjust the white balance of the high-light with RV124
(R GAIN/BL) and RV125 (G GAIN/BL) on the B
board.
12. Using the luminance meter, adjust the luminance level
on the CRT screen with test signal generator so that it
is 8 Nit. Then confirm that the white balance is
adjusted correctly.
8 Center click
8 Minimum
8 50 %
8 50 %
Colorbar pattarn
Fig. 3-16
3-5