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• ADJUSTMENT METHOD
Item
81 power
supply
adjustment
High voltage
check
Focus
adjustment
Test equipment
Voltmeter
Variable transformer
High voltage meter
Signal generator
(Resolution pattern)
Test points
Adjustment
locations
TP-91(81 ):
81 adjust VR
S1
G)
pin
[MAIN PW8]
TP-E(GND):
S1 @ pin
SCREEN VR
[MAIN PW8]
(Lower knob :
CRT Anode
In HVT]
SCREENVR
[Lower knob :
In HVT]
FOCUS VR
[Upper knob :
In HVT]
No.51702
TM-1650SDU
Adjustment procedure
1. Set power supply voltage to AC120V±5V.
2. Select WHITE BALANCE BLOCK mode.
3. Select CUTOFF adjustment mode (LOW LIGHT
mode).
4. Press "SERV" switch as CONTRAST key, to
display the horizontal line.
5. Adjust the SCREEN VR to disappear
the
horizontal line.
6. Adjust "B1 adjust VR" to set the B1 voltage to
53V ±0.2V.
7. Readjust the SCREEN VR to appear the
horizontal line faintly, and cancel the horizontal
line to press the "SERV" switch.
CAUTION:
HEAT SINK (H003) is energised, and not GND .
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B1 voltage adjustment have been finished.
1. Set power supply voltage to AC120V ± 5V.
2. Select WHITE BALANCE BLOCK mode.
3. Select CUTOFF adjustment mode (LOW LIGHT
mode).
4. Press "SERV" switch as CONTRAST key, 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 for 23.7-26.3kV.
7. Readjust the SCREEN VR to appear the
horizontal line faintly, and cancel the horizontal
line to press the "SERV" switch.
CAUTION:
HEAT SINK (H003) is energised, and not GND .
1. Adjust the Focus VR for optimum focus where
moire is not apparent.
2. Darken the picture and adjust the focus by
tuning counter-clockwise from the position where
focus is poor.
3. Alternately repeat the above steps to obtain the
optimum position.
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Focus can be adjusted easily by displaying the
menu .
23
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