HP 1055CMHP - Manual (Page 89)

Service Tests and Utilities
4-15 HP DesignJets 1050C and 1055CM Printers Service Manual
3 If the test passes, then the following message will appear on the
front panel:
WARNING IF THIS TEST PASSES, DO NOT REPLACE THE TUBES
SYSTEM OR THE APS.
4 If the test fails.
Tubes System Failure
If there is a problem with the Tubes System then the following
message will appear on the front panel:
In this case, try one of the following:
1 Replace ALL the Ink Cartridges.
2 Replace the complete Tubes System
⇒
Page 8-53.
3 Replace the Electronics Module
⇒
Page 8-25.
WARNING Only replace one component at a time and try the Service Test
again before replacing another component. Using this procedure
you will be able to determine exactly which component failed.
APS Test Failure
If there is a problem with the APS then the following message will
INK PRESSURE SYSTEM
Tests passed
INK PRESSURE SYSTEM
Possible Failure on:
1. Ink Cartridge CMYK
Code: 00XXXX:0000XX
2. Tubes
3. Electronics Module