JVC TM-H1700G/E Service Manual page 26

TM-H1700G
ADJUSTMENT
Item Test equipment
Checking of DC Voltmeter
the B1 power
supply
Checking of High voltage meter
the High
voltage
Focus Signal generator
adjustment (Resolution pattern)
26
Adjustment
Test points
locations
TP-91(B1) : B1 ADJUST VR
[MAIN PWB]
(S1 ① ① ① ① pin)
SCREEN VR
TP-E(GND) :
[Lower knob :
(S1 ⑤ ⑤ ⑤ ⑤ pin)
in FBT]
[MAIN PWB]
CRT Anode
SCREEN VR
[Lower knob :
in FBT]
FOCUS VR1
FOCUS VR2
[Upper knob :
in FBT]
No.51922
Adjustment procedure
1. Set the power supply voltage to
AC230V± ± ± ± 5V (TM-H1700G/
AC120V± ± ± ± 5V (TM-H1700G/
2. Select WHITE BALANCE BLOCK mode from
<BLOCK SELECT> screen.
3. Select CUTOFF adjustment mode (Low light
mode).
4. Press "SERV" switch to display the horizontal
line.
5. Adjust the SCREEN VR to disappear the
horizontal line.
6. Check the B1 voltage as 53V± ± ± ± 0.2V .
7. Readjust the SCREEN VR to appear the
horizontal line faintly, and cancel the horizontal
line to press the "SERV" switch.
1. Set the power supply voltage to
AC230V± ± ± ± 5V (TM-H1700G/
AC120V± ± ± ± 5V (TM-H1700G/
2. Select WHITE BALANCE BLOCK mode from
<BLOCK SELECT> screen.
3. Select CUTOFF adjustment mode (Low light
mode).
4. Press "SERV" switch to display the horizontal
line.
5. Adjust the SCREEN VR to disappear the
horizontal line.
6. Connect the high voltage meter to the CRT anode
and check it as 25.0～ ～ ～ ～ 27.0kV .
7. Readjust the SCREEN VR to appear the
horizontal line faintly, and cancel the horizontal
line to press the "SERV" switch.
1. Input the resolution pattern signal.
2. Adjust the Focus VR1 and VR2 for optimum focus
where moire is not apparent.
3. Darken the picture and adjust the focus by turning
counter-clockwise from the position where focus
is poor.
4. Alternately repeat the above steps to obtain the
optimum position.
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