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HP Designjet 5000 and 5500 Series Printers - TWI: System Error 0B0008

	Parts required (part numbers are subject to change)
	Troubleshooting steps
	Backup EEROM service utility

Document number: BPP90169

Last Updated: 04-Dec-2002

Minimum skill level: 2

The printer is unable to detect the cooling fans. Follow the steps listed below to determine the actual cause of the error and to replace the necessary parts.

Parts required (part numbers are subject to change)

Part description	HP Designjet 5000 series models - C6090A/V, C6091A/V, C6095A/V, C6096A/V	HP Designjet 5500 series models - Q1251A/V, Q1252A/V, Q1253A/V, Q1254A/V
(2) Cooling fans (Required)	C6090-60029	C6090-60029
Power Supply Unit (Required)	C6090-60315	C6090-60315
HDD controller (Required)	C6090-60318	C6090-60318
Main PCA (Required)	C6090-60317	Q1251-60030

NOTE: If removal and installation instructions are needed for reference during any repairs performed, refer to the HP Designjet 5000 and 5500 Series Service Manual available on the HP Partner Care Web site for review or download.

Troubleshooting steps

If parts are replaced or fixed in any of the steps listed below, attempt to verify printer functionality before continuing with the remaining steps. Verify functionality by turning the printer on and successfully printing internal test prints. If functionality is verified, no additional parts should be replaced.

1. Turn the printer off, using the main power switch located on the back of the printer.
2. After 10-15 seconds, turn the main power switch on.
3. If no error appears, attempt to verify printer functionality.
4. If the error re-appears, continue with the remaining steps.
5. Turn the printer off.
6. Ensure the cooling fans are connected correctly to the power supply unit (refer to pages 8-88 of the 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.

7. If cables are re-connected, attempt to verify functionality.
8. If problems persist, determine if one or both of the fans is functional (if one fan operates correctly, turn the printer off, swap connections between the two fans, turn the printer on and determine if the fan, or the power supply is faulty).
9. If both of the fans operate fine when swapped (only one connection operates the fans correctly), replace the power supply unit (refer to pages 8-88 of the service manual).
10. If both fans do not operate, turn the printer off and connect the new cooling fans to the power supply unit (refer to pages 8-88 of the service manual).
11. Turn the printer on, if both fans operate correctly and no system error appears, verify printer functionality.
12. If problems persist, turn the printer off and replace the Main PCA and the HDD controller (which connects to the new Main PCA). Refer to pages 8-81, 8-85 of the service manual.
13. Following replacement, turn the printer on and perform the Backup EEROM Service Utility (instructions below).
14. Turn the printer off, then on, and verify functionality.

Backup EEROM service utility

1. Turn the printer on.
2. When the "READY" message is displayed on the front panel, scroll to the Printer Setup Options icon and press the ENTER key.
3. Using the Arrow keys, scroll to Utilities and press ENTER.
4. Press the Up Arrow key and the ENTER key simultaneously.
5. Select Service Utilities and press ENTER.
6. Scroll to 1.6 Backup EEROM and press ENTER.
7. Select the part replaced (Main PCA) and press ENTER.
8. A message confirming the selection will appear, press ENTER to confirm (if the wrong part is selected, press BACK to cancel). The printer will perform the backup and display the message, "Backup performed correctly."
9. Press the BACK key to return to the previous menu.
10. Press the BACK key again to return to the Service Utilities menu.
11. Turn the printer off then on and verify functionality.

Copyright Hewlett-Packard Co. 2002
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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