Cathode Dc Bias Adjustment; Rgb White Balance (Low & High) Adjustment - Panasonic PT-M1083U Service Manual

4. Adjust
R3729 (SUB CONTRAST) on the L Y-P.C.80ard
so that the value of a voltmeter is 200mV :t 10mV.
5. Adjust R3728 {SUB BRIGHT} on it so that the voltage
of the bright pulse is 0 :t 5mV.
CATHODE DC BIAS ADJUSTMENT
(LR/LG/LB-P.C.Boards)
1. EQUIPMENT TO BE USED
Oscilloscope
Programmable Signal Generator
2. INITIAL CONDITION (on screen value)
BRIGHT 128
CONTRAST MAX
3. ADJUSTMENT PROCEDURE
1. Input a crosshatch
pattern
signal (rH=31.5kHz,
fV=60Hz) to RGB IN 1.
2. Connect
an
oscilloscope to TPLR1.
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3. Adjust R3205 (R.BIAS) on the L Y-P.C.Board so that the
cathode DC bias IS + 170V .z. 5V DC level.
4. Connect an oscilloscope to TPLG1.
5. Adjust R3405 (G.BIAS) on the L Y-P.C.Board
so thatthe
cathode DC bias is + 170V ::!: 5V DC level.
6. Connect an oscilloscope to TPLB1.
7. Adjust R3605 (B.BIAS) on the LC-P.C.Board so that
the
cathode DC bias is + 170V :t5V DC level.
RGB WHITE BALANCE (LOW & HIGH)
ADJUSTMENT
1.
EQUIPMENT TO BE USED
Oscilloscope
Programmable Signal Generator
Color Analyzer
Remote Control
Note: For remote control operation. see REMOTE
CONTROL OPERATION PROCEDURE to be
described later.
2. INITIAL CONDITION (on screen value)
COLOR
"'0""""
MID
BRIGHT 0.. 128
CONTRAST 0 MAX
3. ADJUSTMENT PROCEDURE
1. Input a white window
pattern
signal
fV=60Hz) to RGB IN 1.
(fH=31.5kHz,
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