HP 350 Power-On Initialization Tests, Power-On Initialization Sequence Tests Test # Description

Power-On Initialization Tests

When first powered-on, the HP OfficeJet Series 300 performs a series of tests during the initializ

control panel will brieflyServodisplayProcessor“ Revision”, evenx.xif. no firmware is installed. If t initialization cannot proceed past this display, the firmware should be checked (or insta display shown willSelfbeTest“ Please”.Wait

Refer to the following table for a description of the power-on self tests performed.

		Power-On Initialization Sequence Tests
Test #	Test	Description
1	Test RAM Memory	Checks RAM not used for system.
2	Test ROM	Firmware checksum.
3	Scanner Check	Calibrates scanner. Calibrated sensitivity level checked
		minimum reference level.

4Printer Mechanism CheckPaper drive motor is briefly driven, carriage driven to s tion position, presence of encoder feedback checked, ext carriage position located, paper pick mechanism exercis presence and ink level detected, carriage returned to s tion.

5	SRAM Checksum	Catches SRAM corruption or SRAM lost due to a low or
		defective battery.
6	LIU Code #	Matches the LIU code read from the LIU to that which is
		already stored in SRAM.
7	SRAM Version #	Compares the SRAM version number read from firmware to
		which is already stored in SRAM.
8	LIU Check	Checks if the LIU is present. A system error code will be
		displayed if there is no LIU.

When the display readsReady“ (receive mode) (date)”, the(time)test is complete.

If an error is detected, an error message or diagnostic code will be displayed. If neces messages and diagnostic codes presented earlier in this chapter.

5-40Problem Resolution