1. Make sure the AC power supply is 230V, 50Hz.
2. Switch on the TV receiver, tune in an active channel.
3. Measure the voltage between C641 on Main P.C. Board DC voltmeter.
4. Set contrast, brightness, color to maximum.
5. Adjust VR631 on Main P. C. Board for B+140V+/-0.5V voltage reading.
HIGH VOLTAGE CHECK
C
AUTION: There is no high voltage adjustment in this chassis, B+140V voltage
directly relates to the high voltage. The high voltage does not exceed 30KV under any
conditions.
1. Connect an accurate high voltage meter to the second cap of the picture tube.
2. Turn on the receiver, set brightness and contrast to minimum (Zero beam current).
3. Make sure the high voltage does not exceed 30KV.
4. NO matter whether the luminance, contrast and chrominance controls are set to
maximum or minimum, the high voltage must be kept under 30KV.
FOCUSING
Receive a TV test pattern signal; adjust controls for optimum picture. Adjust Focus
Control for a well-defined, sharpest display in the center area of the screen.
ADJUSTMENT AND SERVICING THE VHASSIS
SERVICE MODE
To enter the service mode, a special remote control which contains an additional
SERVICE key must be used to setup the chassis in producing. See the illustration.
Press the
‘
SERVICE
’
key on remote control, TV will display service menu as following
table 1. To select the parameter requiring adjustment, use the
‘
P+/P-
’
keys. To adjust
the selected parameter, use the
‘
V+/V-
’
keys. To quit the service mode, press the
‘
P.P.
’
key on remote control when in the service mode.
Table 1
Parameter
Value
Red Gain
45
Fix value
DC Red
063
Fix value
Green Gain
45
Fix value
DC Green
063
Fix value
Blue Gain
45
Fix value
DC Blue
063
Fix value
Apr Threshold
15
Fix value
Logo
6------------
Fix value
To enter the table 2, press the
‘
OK
’
key for the first time on the remote control while in
above service mode.
