Hitachi C21-RF80S Service Manual - Page 18

OSD Position Adjustment, White Balance Adjustment Applied in factoryKEY 9, RF.AGC AdjustmentKEY 7 - manual

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SERVICE ADJUSTMENTS Receive 60HZ cross hatch pattern. Press PIC. MODE key to set picture in STANDARD mode. Adjust VSLOPE to obtain half of the crosshatch. Adjust VSCOR to obtain picture s best vertical pin cushion. Adjust VSHIFT to obtain picture s vertical center at the center of CRT screen in factory mode. Adjust HSHIFT to obtain picture s horizontal center at the center of CRT screen in factory mode. Receive 60HZ monoscope pattern.Press PIC. MODE key to set picture in STANDARD mode. Adjust VAMP to obtain picture s vertical redisplay ratio more than 90% in factory mode. Item Vertical slope 60Hz Vertical shift 60Hz Vertical amplitude 60Hz S-correction 60Hz Horizontal shift 60Hz Display String VSLOPE VSHIFT VAMP VSCOR HSHIFT OSD Position Adjustment Menu OSD position adjustment: Receive 50/60HZ cross hatch pattern. Press PIC.MODE key to set picture in STANDARD mode . Press KEY 5 infactory mode, adjust OSD VPOS And OSD HPOS item to obtain menu OSD at the center of CRT screen. White Balance Adjustment (Applied in factory)(KEY 9 ) Normally, this TV can auto adjust white balance, but for some CRT maybe need to adjust white balance manually. Set BRIGHTNESS and CONTRAST at normal status , receive GREY SCALE and enter factory mode. Press KEY 9 and set BD at 31.Adjust RD and GD to obtain white balance. RF.AGC Adjustment(KEY 7 ) Receive 60dB RF signal. Connect Digital voltmeter positive terminal to tuner AGC terminal and negative terminal to GND. Enter the AGC item in factory mode by the REMOTE CONTROL. Method: Press key SOUND MODE , RECALL , CH I/II to enter factory mode, then press KEY 7 and select RF AGC item by P+ and P - . Adjust + and on screen. keys to obtain 2.8V digital voltage meter reading or till no NOISE Press RECALL key to exit factory mode. -18-

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-18-
Item
Display
String
Receive 60HZ cross hatch pattern. Press
PIC. MODE
key to set picture in STANDARD mode.
Adjust VSLOPE to obtain half of the crosshatch. Adjust VSCOR to obtain picture s best vertical
pin cushion. Adjust VSHIFT to obtain picture s vertical center at the center of CRT
screen in factory mode.
Receive 60HZ monoscope pattern.Press
PIC. MODE
key to set picture in STANDARD mode.
Adjust VAMP to obtain picture
s vertical redisplay ratio more than 90% in factory mode.
SERVICE ADJUSTMENTS
screen in factory
Adjust HSHIFT to obtain picture s horizontal center at the center of CRT
mode.
Vertical slope 60Hz
VSLOPE
Vertical shift 60Hz
VSHIFT
S-correction 60Hz
VAMP
Horizontal shift 60Hz
VSCOR
Vertical amplitude 60Hz
HSHIFT
OSD Position Adjustment
Menu OSD position adjustment: Receive 50/60HZ cross hatch pattern. Press
PIC.MODE
key to set picture in STANDARD mode .
Press
KEY 5
infactory mode, adjust OSD VPOS
And OSD HPOS item to obtain menu OSD at the center of CRT screen.
White Balance Adjustment (Applied in factory)(KEY 9 )
Normally, this TV
can auto adjust white balance, but for some CRT maybe
need to adjust white
balance manually. Set BRIGHTNESS and CONTRAST at normal status , receive
enter factory mode. Press
and set BD at 31.Adjust RD and GD to obtain white balance.
GREY SCALE and
RF.AGC Adjustment(KEY 7 )
Receive 60dB RF signal. Connect Digital voltmeter positive terminal to tuner AGC terminal
and negative terminal to GND.
Enter the AGC item in factory mode by the REMOTE CONTROL.
Method: Press key
to enter factory mode, then press
and select
AGC item by
Adjust
keys to obtain 2.8V digital voltage meter reading or till
no NOISE
on screen.
Press RECALL key
to exit factory mode.
KEY 9
KEY 7
P
+
P
-
and
+
and
SOUND MODE
CH I/II
,
,
RECALL
.
RF