Sharp LC-13C3US, Service Manual

Page: 16 / 88

16
LC-13C3U-S
LC-15C3U-S
4. Adjustments
1 B+ Adjustment
(R3760)
2 Inch Size setup
(If E
2 PROM is replaced)
(IC2004)
3 Common-bias adjustment
4 TAMP adjustment
5 White balance adjustment
Adjustment Adjusting conditions Adjusting method
1. Connect the DC voltmeter to
pin 2 of P3702.
1. Go to the adjustment mode.
1. Receive a B/W channel.
2. Go to the adjustment mode.
3. Select the "COM BIAS" with
[MENU] key.
1. Receive a half color bar signal in the
TV mode so that the top left zone
should turn white 75% as shown be-
low. Other signal can be fed instead
of the half color bar signal, however,
if the point at the vertical 180th line
and horizontal 46th pixel is of white
75%. (Make the adjustment based on
the setting of this point.)
2. Adjust the “NTSC TAMP” setting on
page 2 of adjustment process mode
so that the “Y” reading on the same
page should be BB - CA.
3. Make the same setting for the PAL-
M TAMP and PAL-N TAMP data.
1. Receive the monoscope pattern sig-
nal.
2. A d j u s t t h e “ R C U T O F F ” a n d
“BCUTOFF” settings on page 2 of
adjustment process mode to achieve
an optimum white balance.
1. Adjust the "B+ Adj" value to
5.0±0.02V with R3760.
* Keep the voltage at pin(2) of P3702
below 5.3V during the adjustment.
1. Select "INCH SIZE" and adjust to
"13"(LC-13C3U-S), "15"(LC-15C3U-S)
with [VOL+] or [VOL-] key.
* The color of "INCH SIZE" must be
yellow.
1. Adjust "COM BIAS" to the darkest
screen with [VOL+] and [VOL-] key.
* The color of "COM BIAS" must be
yellow.
1. Do not change the “GCUTOFF” setting
because otherwise the black level may
fluctuate.
White 75% at
top left zone Vertical 180th line and
horizontal 46th pixel
480 lines
640 pixels
Page 2 of adjustment process mode
2
|
COM BIAS 140
NTSCTAMP 27
PAL-M TAMP 27
PAL-N TAMP 27
RCUTOFF 0
GCUTOFF 0
BCUTOFF 0
G3 B3 R3 00 00 00
G1 B4 Y DF DE B5
TAMP H C9
TAMP L BF
GAIBU VER0.000
Y data
(white 100%)