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HP Designjet 500 and 800 Series Printers - TWI: System Error 42:10

	Parts required (part numbers are subject to change)
	Troubleshooting steps
	Verifying printer functionality

KRS document number: BPP90160

Last Updated: 19-Nov-2001

Minimum skill level: 2

System error 42:10 is generated when the Scan Axis/Carriage motor is plugged into the Electronics module but has failed. Causes of this error can include the Scan-Axis Motor or the Electronics module. Follow the steps listed below to accurately troubleshoot the issue, and replace the appropriate parts.

Parts required (part numbers are subject to change)

Part Description	Designjet 500 Model Numbers - C7769B, C7770B, C7769C, C7770C	Designjet 800 Model Numbers -C7779B, C7780B, C7779C, C7780C
Scan-Axis Motor Assembly (Required)	C7769-60375	C7769-60375
Electronics Module (Required)	C7769-60236	C7769-60236

NOTE: If Removal and Installation instructions are needed for reference during any repairs performed, refer to the 500/800 Series Service Manual available on the Computer Care Web site for review or download.

Troubleshooting steps

If any of the troubleshooting steps listed below solve the problem, attempt to verify printer functionality (instructions below). If functionality is verified, no additional parts should be replaced.

NOTE: Always verify the printer's current Firmware release and upgrade as needed.

1. Turn the printer Off, then On to verify error. If no error attempt to verify functionality.
2. If the error appears or problems persist, continue with the remaining steps.
3. Turn the printer Off.
4. Turn the printer On while holding down the ENTER and UP Arrow keys (to access Service mode). Continue to hold the buttons until the printer beeps.
5. Press the ENTER key to access Service Tests (Service tests selection is default).
6. Using the ARROW keys, scroll to Carriage Movement and press ENTER.
7. The Carriage should move during the test.
8. If the Carriage does not move or problems are observed during the test, replace the Scan-Axis motor (refer to pg. 8-29 of the 500/800 Series Service Manual).

WARNING: To prevent possible injury, always remove the power cable from the back of the printer before connecting/disconnecting any internal printer cables or performing any repairs.

9. Following replacement, attempt to verify functionality. If the problem persist, continue with the remaining steps.
10. Replace the Electronics module (refer to pg. 8-24 of the 500/800 Series Service Manual).
11. Following replacement, verify printer functionality as instructed below.

Verifying printer functionality

1. Turn the printer On.
2. Allow initialization to complete.
3. Load media into the printer.
4. From the main front-panel menu, select the Ink menu and press ENTER.
5. Select Troubleshooting and press ENTER.
6. Follow the instructions on the front panel.
7. Following a successful troubleshooting plot, printer functionality has been verified.

Copyright Hewlett-Packard Co. 2001
This information is subject to change without notice and
is provided "as is" with no warranty.
Hewlett-Packard shall not be liable for any direct,
indirect, special, incidental or consequential damages
in connection with the use of this material.

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