Adjustment - Haier 21F8A Service Manual

12.

Adjustment

The chassis of this TV set uses Toshiba IC with the latest digital bus processing technology.
The adjustment points are fewer and the adjustment is simpler. The adjustment method is as
follows:
1) +B: 127 ± 0.3V adjustment.
A) Switch on the power and connect PAL circular signals to the tuner.
B) Adjust variable resistor RP501 until the voltage of the main power is 127±0.3V.
2) Screen voltage adjustment.
A) Switch on the power and receive PAL system circular signal. Warm up the TV set for 15
min.
B) Enter the adjustment D state. Press the "-/--" button, then a bright horizontal line appears.
Adjust screen potentiometer to let the horizontal line just appears.
3) Focus adjustment.
A) Receive electronic circular signal.
B) Set picture mode on standard mode.
C) Adjust focus potentiometer until the optimum picture is achieved.
4) White balance adjustment.
A) Set the picture mode on standard mode.
B) Enter the Factory state and adjust WPR, WPG, WPB, RED and GRN.
C) Coordinate of reference white color: (X=0.281, Y=0.311).
5) Adjustment of horizontal and vertical position and size.
A) Switch on the power and connect the signals to the tuner to receive PAL/NTSC system
circular signal.
B) Enter the Factory state. Adjust 5HSH to change the horizontal position and 5VAM to
change the vertical position. Adjust 5VSH to change the vertical size until the vertical size
is 90-92%. Horizontal size is related to the capacitor C906. Hold the horizontal size is
90-92%.
6) Adjustment of character positions
Adjust OSD for the horizontal positions of the screen menu.
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