HP 1055CM manual Service Tests Diagnostics, Service Tests work in a special Mode which does not

	Service Tests and Utilities
Service Tests (Diagnostics)
	The following is a list of all internal Service Tests available in the
	Printer. Instructions for entering the Service Tests menu are given
	on Page 4-4.
	The Service Tests work in a special Mode which does NOT
WARNING
	require the full Initialization of the Printer. Therefore it is
	important that once you have finished with the Service Tests, you
	MUST power OFF the Printer and Power ON again before
	trying to print.
	Electronics System ⇒ Page 4-5
1
	The purpose of this test is to verify the operation of the:
	Electronics Module.
	DRAM.
	nTrailing Cable.
	Carriage Assembly.
2	EIO Card ⇒ Page 4-10
	The purpose of this test is to verify the operation of the EIO Card.
3	Hard Disk Drive ⇒ Page 4-12
	The purpose of this test is to verify the operation of the Hard Disk
	Drive.
4	Ink Pressure System ⇒ Page 4-14
	The purpose of this test is to verify the operation of the:
	nService Replaceable Kit (SRK).
	Air Pressurization System (APS).
5	Scan Axis ⇒ Page 4-17
	The purpose of this test is to verify the operation of the Scan-Axis.
6	Paper Axis ⇒ Page 4-20
	The purpose of this test is to verify the operation of the Paper-Axis.
7	Drop Detector ⇒ Page 4-22
	The purpose of this test is to verify the operation of the Drop
	Detector.

HP DesignJets 1050C and 1055CM Printers Service Manual 4-3