6 Quick Reference Service Manual
HP DesignJet 430, 450C and 455CA Printers
Service Tests
Entering Service Mode 1
While holding the Reprint key 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 holding the 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 frontĆpanel keys. To
exit any Service Mode, you must power OFF the Printer.
Front Panel Test
Purpose Ć Verify the operation of the frontĆpanel keys and LEDs.
In service mode 1, press Front Panel Test (Form Feed Key).
Check that all LEDs are functioning correctly 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.
Carriage Axis (YĆaxis) Test
Purpose Ć Verify the operation of the components of the Carriage Axis.
Always make sure that the carriage is parked in the service station before starting
this test.
In service mode 1, press CarriageĆAxis Test (Reprint Key).
If the test passes, the Fast LED (LED A) will light up after the first cycle.
If there is a YĆaxis shutdown, the Fast LED (LED A) will start to flash.
If the test fails: Clear any binding due to a media jam. Turn the Printer off and manually
move the carriage along the carriage axis. Check for any areas where the carriage may be
binding. Ensure that the belt and belt pulley are in correct working order. Remove dirt from
the pulley that could cause the belt to slip. Remove dirt from the slider rod and chassis beam.
Apply oil (Anderol 4068, HP part number: 6040Ć0858) to the carriage bushings. At high
temperatures, and if the fan is not working correctly, the internal resistance of the motor
driver may increase, causing a decrease in the voltage between the motor contacts, and a
shutdown of the motor. Ensure that the encoder strip is not inverted, damaged or absent.
Reconnect or replace the trailing cable. Replace the carriage assembly.
