Sharp GX10i Service Manual page 72

GX10i
3) LCD Test
When adjusting by the AT command, be sure to perform the LDDEVPRM command before adjustment and the
SVDEVPRM command after adjustment.
Main-Screen Display Test
Incoming Serial Signal Outgoing Serial Signal
Item
Command
Checking LCDDISP
LCD display
Flicker
VCOM
adjustment
Flicker VCOMRD
adjustment
VCOM Adjustment (Flicker adjustment)
Display the 8-gradation pattern. Seeing from the position within 20 cm from the inverted fluorescent light, adjust the VCOM
voltage, performing the VCOM command.
Voltage for the lowest flicker is optimal for VCOMDC.
Flicker can be adjusted manually without using the AT command. (Refer to the, "Adjustment procedures after replacement of
parts" on pages 2 – 36 and 2 – 37.)
Black lines are displayed line by line of the 8-gradation pattern
(Black-and-white pattern)
Sub-Screen Display Test
Incoming Serial Signal Outgoing Serial Signal
Item
Command
C h e c k i n g SUBLCD
the rear liq-
uid crystal
display
CONFIDENTIAL
n Response
3 LCDDISPn
2
1
0
=nn nn (nn: 0 to D6)
None VCOMRD=nn
n Response
2 OK
1
0
2 – 68
Contents
VCOM adjustment pattern.
Color bar (65 k colors).
Black display (65 k colors).
White display (65 k colors).
Changing DL [7 : 0] bit value of
SIF1 register (No redrawing).
Read the current data.
Close-up
(black lines displayed line by line)
Contents
Inverted display of hound's tooth
check S.
Hound's tooth check.
Initial display.
Test Method
LCDDISP3 is the command for flicker
adjustment pattern.
Flicker adjustment by performing the
AT command.
Flicker adjustment by performing the
AT command.
Test Method
Checking the sub liquid crystal dis-
play.