HP DesignJet 430, 450C, 455CA Printers Quick Reference Service Manual
Entering Service Mode 1
While holdingthe Reprintkey down, switch the Printer ON. Once the the LEDs begin to light up one by one, release the Reprint key.
Entering Service Mode 2
While holdingthe Media Source key down, switch the printer ON. Once the the LEDs begin to light up one by one, release the Media Source key.
Stopping a Test
The service tests are continuously repeated in Service Mode 1 until you press the Cancel and Media Source keys. To stop a test in Service Mode 2, press any of the frontpanel keys. To exit any Service Mode, you must power OFF the Printer.
FrontPanel Test
Purpose Verify the operation of the frontpanel keys and LEDs. In service mode 1, press FrontPanel Test(Form Feed Key). Check that all LEDs are functioningcorrectly when they flash. Each time a key is pressed, the Coated LED (LED I) will be lit. If a key fails, the Coated LED (LED I) will remain OFF. If the test fails: 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. Replace the Front Panel Assembly. Replace the Electronics Module.
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