Casio Cassiopeia E-125 Service Manual And Parts List page 42

7. ADUSTMENT
There are two kinds of adjustments using Operation Check diagnostic program concerning E-125 as
well as EM-500.
Refer to OPERATION CHECK in this manual concerning how to enter into Operation Check Mode.
The following two adjustments can not be performed without entering into Operation Check Mode.
For more information, refer to OPERATION CHECK in this manual.
It is recommended to perform these adjustments whenever replacing Main PC Board Assembly.
Display Quality adjustment (TFT VCOM voltage adjustment)
When flickers and vertical stripes appear in the screen display, try to perform this adjustment according
to the following procedure.
Refer to OPERATION CHECK and DISASSEMBLY PROCEDURE in this manual.
1. Set AC adapter, the rechargeable battery and CF card installed the diagnostic program to the unit
after disassembling the unit as shown below.
2. Enter into Operation Check Mode referring to OPERATION CHECK in this manual.
Doing so, Main Menu for Operation Check will appear.
3. Tapping 8 COLOR BAR, the following Color Bar check Menu display appears.
** COLOR BAR **
1 Contrast
2 Scroll
3 GRAY
4. Tapping 3 GRAY, all gray display appears on the screen.
If abnormal displays (flicker, vertical stripes and so on) are detected, change VCOM voltage
rotating above variable resistor VR300 using a ceramic screwdriver (minus/ 1.8 mm width) so that
these abnormal displays disappear.
VR300 can be supplied as one of the spare parts. Refer to PARTS LIST in this manual.
Refer to page 70 in the Service Manual for E-115 concerning VCOM.
VCOM: Common electrode voltage for TFT LCD pixel.
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