HP 1050c Service Manual - Page 88

Service Tests and Utilities WARNING NOTE 4. Ink Pressure System The purpose of this test is to verify the operation of the: n Tubes System. n Air Pressurization System (APS). IF POSSIBLE ALWAYS PERFORM THIS TEST BEFORE REPLACING THE TUBES SYSTEM OR THE APS. IF THIS TEST PASSES, DO NOT REPLACE THE TUBES SYSTEM OR THE APS. The Service Tests work in a special Mode which does NOT require the full Initialization of the Printer. Therefore it is important that once you have finished with the Service Test, you MUST power OFF the Printer and Power ON again before trying to print. Perform the Ink Pressure System test as follows: 1 In the Service Tests submenu, scroll to "4. Ink Pressure System" and press Enter. Service Tests 1. Electronic Systems 2. EIO Card 3. Hard Disk Drive 4. Ink Pressure System 5. Scan Axis Top Back ↑ Make Selection ↓ Enter Press Enter 2 The test will start and the following sequence of messages will appear on the front panel: INK PRESSURE SYSTEM Running SRK Test... INK PRESSURE SYSTEM Running APS Test... 4-14 HP DesignJets 1050C and 1055CM Printers Service Manual