Panasonic SX-KN2600P Service Manual page 16

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- 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)
- Press the WHITE/BLACK, CROSSTALK, SAMPLE or CONTRAST
button to begin the respective test. (refer to
WHITE/BLACK:
All the dots light in white and finally 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 right 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
Fig.16
Fig.16
Fig.17
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