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 by DC voltmeter.
4. Set contrast, brightness, color to maximum.
5. Adjust VR631 on Main P. C. Board for B+108.0V+/-0.5V voltage reading.
HIGH VOLTAGE CHECK
C
AUTION: There is no high voltage adjustment in this chassis, B+108V voltage
directly relates to the high voltage. The high voltage does not exceed 27KV under any
conditions.
1. Connect an accurate high voltage meter to the second anode 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 27KV.
4. NO matter whether the luminance, contrast and chrominance controls are set to
maximum or minimum, the high voltage must be kept under 27KV.
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 CHASSIS
SERVICE MODE
To enter the service mode, a special remote control which contains an additional
SERVICE key must be used. See the illustration. Press the
‘
SERVICE
’
key on remote
control, TV will display service menu as following table 1 line by line. To select the
parameter by using the
‘
P+/P-
’
keys. To adjust the selected parameter by using 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
32
DC Red
063
Green Gain
32
DC Green
063
Blue Gain
32
DC Blue
063
Apr Threshold
12
Logo
6------------
