HP 450c Service Manual - Page 43

Front Panel Test, LED I, Cancel and, Media Source, Form Feed Key.

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Front Panel Test The purpose of this test is to verify the operation of the frontĆpanel keys and LEDs. Perform the Front Panel test as follows: 1 In service mode 1, press Front Panel Test (Form Feed Key). If you are viewing information via the serial port, you will see output similar to the following: 1. - Front Panel Test This message only informs you that the test has started, and a message will not appear if the test passes or fails. 2 The test will start and all the LEDs will flash for 2 seconds after which they will all be turned OFF. Check that all LEDs are functioning correctly when they flash. 3 To check that the frontĆpanel keys function correctly, press them one by one. Each time a key is pressed, the Coated LED (LED I) will be lit. 4 If a key is not functioning, the Coated LED (LED I) will remain OFF. 5 The test continuously repeats itself until you press the Cancel and Media Source keys. If the test fails, to resolve the problem, try one of the following: 1 Check that the cable for the Front Panel Assembly is connected to the Electronics Module. Also make sure that the cable is NOT damaged or twisted. 2 Replace the Front Panel Assembly ' page 8Ć12. 3 Replace the Electronics Module ' page 8Ć13. Service Tests HP DesignJet 430, 450C and 455CA Printers 4-9

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Service Tests
4-9
HP DesignJet 430, 450C and 455CA Printers
Front Panel Test
The purpose of this test is to verify the operation of the frontĆpanel keys and
LEDs.
Perform the Front Panel test as follows:
1
In service mode
1
, press
Front Panel Test
(Form Feed Key).
If you are viewing information via the serial port, you will see output
similar to the following:
1. - Front Panel Test
This message only informs you that the test has started, and a message
will
not
appear if the test passes or fails.
2
The test will start and all the LEDs will flash for 2 seconds after which
they will all be turned OFF. Check that all LEDs are functioning correctly
when they flash.
3
To check that the frontĆpanel keys function correctly, press them one by
one. Each time a key is pressed, the Coated LED (
LED I
) will be lit.
4
If a key is not functioning, the Coated LED (
LED I
) will remain OFF.
5
The test continuously repeats itself until you press the
Cancel and
Media Source
keys.
If the test fails,
to resolve the problem, try one of the following:
1
Check that the cable for the Front Panel Assembly is connected to the
Electronics Module. Also make sure that the cable is NOT damaged or
twisted.
2
Replace the Front Panel Assembly
'
page 8Ć12.
3
Replace the Electronics Module
'
page 8Ć13.