Hitachi C21-RF80S - 21" CRT TV Service Manual page 18

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
mode. Adjust HSHIFT to obtain picture s horizontal center at the center of CRT
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.
Vertical slope 60Hz
Vertical shift 60Hz
Vertical amplitude 60Hz
S-correction 60Hz
Horizontal shift 60Hz
OSD Position Adjustment
Menu OSD position adjustment: Receive 50/60HZ cross hatch pattern. Press PIC.MODE
key to set picture in STANDARD mode .
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
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
and select
KEY 7
Adjust
+
on screen.
Press RECALL key to exit factory mode.
Item
and set BD at 31.Adjust RD and GD to obtain white balance.
KEY 9
SOUND MODE RECALL
,
AGC item by
RF
P+
keys to obtain 2.8V digital voltage meter reading or till no NOISE
and
-18-
Display String
VSLOPE
VSHIFT
VAMP
VSCOR
HSHIFT
Press KEY 5 infactory mode, adjust OSD VPOS
CH I/II
to enter factory mode, then press
,
and
P -
.
screen in factory
screen in factory mode.
GREY SCALE and