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Service Tests
4-25
HP DesignJet 430, 450C and 455CA Printers
Servo/Encoder Test
The servo/encoder test performs the following:
D MediaĆaxis encoder test: Verifies the operation of the servo loop
(mediaĆaxis feedback).
D CarriageĆaxis encoder test: Verifies the operation of the servo loop
(carriageĆaxis feedback).
D Records the maximum friction detected in the EEROM. You can view this
information on the service configuration plot.
Perform the Servo/Encoder test as follows:
1 In service mode 2, press Servo/Encoder Test (Media Type Key).
2 The test will start and there will be slight movements in the X and YĆaxis.
After every 5 movements, the direction of the movement will change in
both axis. The maximum PWM of both axis will be saved in the EEROM.
3 To view the results of the test, you must print the Service Configuration
Plot (Print Quality and Media Type keys).
4 If the test fails, an error code will appear on the frontĆpanel. Refer to
Chapter 2 in order to correctly troubleshoot the failure.