LEDs light. If all switches are OK, “ALL SW OK” is shown on the
LCD. (If a switch is defective, nothing is shown.)
- To light all the LEDs, press and hold the DEMO button. If an LED
fails to light, the LED may be defective or there may be a break in
the surrounding circuit.
8.6. LCD module test (LCD adjustment and confirmation)
Figure-25
- Press the BW, CROSSTALK, SAMPLE or CONTRAST button to
begin the respective test.
BW:
All the dots light white and black. The display can be held by
pressing the DISPLAY HOLD button.
CROSSTALK:
An H pattern is shown. LCD crosstalk can be evaluated. To exit
this test, press the EXIT button.
SAMPLE:
Several display patterns shown during normal use are shown. The
display can be held by pressing the DISPLAY HOLD button.
CONTRAST:
The test pattern is shown. Adjust the contrast by the CONTRAST
control on the left of the LCD. To exit this test, press the EXIT
button.
- If the correct display is not shown during these tests, the LCD or
LCD drive circuit may be defective.
8.7. In & Out interface test
Figure-26
18
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