8 Quick Reference Service Manual
HP DesignJet 430, 450C and 455CA Printers
MediaĆAxis (XĆAxis) Test
Purpose Ć Verify the operation of the components of the Media Axis.
In service mode 1, press MediaĆAxis Test (Media Load Button).
If the test passes, the Glossy LED (LED J) will light up after the first cycle.
If there is a shutdown, the Glossy LED (LED J) will start to flash after the first cycle.
If the test fails: Switch OFF the Printer and manually moving the carriage along the slider
rod, check for obstacle or friction in the XĆaxis. Check for a faulty or badly connected XĆaxis
Encoder Cable. Replace media motor. Replace electronics module.
Bench Run
THIS TEST HAS BEEN DESIGNED TO BE USED DURING THE
MANUFACTURING STAGE AND NOT IN THE FIELD. DO NOT AT ANYTIME
ENTER THIS TEST WHEN TROUBLESHOOTING THE PRINTER.
The way to enter into Bench Run is to press the Media Source and Form Feed keys in
Service Mode 1. If these keys are accidently pressed, you must immediately EXIT the
Bench Run by switching OFF the Printer and powering ON again while pressing
the Print Quality and Media Source keys.
Modular Test
This test has been created to check the interaction between various components of the
Printer. It combines the CarriageĆaxis, Carriage, MediaĆaxis, frontĆpanel and sensors tests:
Always make sure that the carriage is parked in the service station before starting
this test.
In service mode 1, press Modular Test (Media Source Key).
The printer first performs the FrontĆpanel Test and once it is fully completed (once all the
keys are pressed) then continues with the rest of the above tests in parallel.
Refer to the following list to check which LED is associated with which test. If the test passes,
the following LEDs will be lit (ON). If the test fails, the following LEDs will be flashing:
Cartridge LED Ć Cartridge Continuity (all).
Align Media LED Ć Analog Multiplexer.
Fast LED Ć CarriageĆaxis.
Best LED Ć Line Sensor.
Media LED Ć Media Sensor.
Sheet LED Ć Pinchwheel Sensor.
Film LED Ć Cover Sensor.
Coated LED Ć FrontĆPanel Sensor.
Glossy LED Ć XĆaxis .
The result of the Encoder sensor test is only reported via the serial output and not via the
frontĆpanel. To perform the encoder sensor test, move the carriage slightly so that the encoder
sensor can detect the change in status. If the carriage is not moved at all, the Encoder Sensor
test will always fail. If the carriage is moved and ONLY the Encoder Sensor test fails, then you
need to replace the Carriage Assembly.
If any of the tests fail, refer to the individual test documented in this chapter.
