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HP Designjet 1000 Series Printers - Front Panel Display is Blank, Weak or Fading

	Parts required (part numbers are subject to change)
	Troubleshooting steps
	Checking contrast
	Multi-Roll feeder disassembly
	Removing the Multi-Roll feeder left side cover
	Removing the Multi-Roll feeder right side cover
	Installation of covers

KRS document number: BPP90217

Last Updated: 21-Nov-2002

Minimum skill level: 2

The printer's front-panel display is blank, weak or fading. Common causes include the front-panel contrast being turned down, or the front panel display itself. Follow the steps listed below to determine the actual cause of the failure and to replace the appropriate parts.

Parts required (part numbers are subject to change)

Part description	Models - C6074A, C6075A	Models - C6074B, C6075B
Front Panel (Required)	C6072-60175	C6072-60175

NOTE: If the printer is installed on a Multi-Roll feeder accessory, some Multi-Roll disassembly may be required to gain access to the printer. Instructions for Multi-Roll disassembly are listed at the bottom of this document for reference.

Troubleshooting steps

If any of the troubleshooting steps listed below solve the problem, attempt to verify printer functionality by printing several internal prints. If functionality is verified, no additional parts should be replaced.

1. Printer must be plugged into a known good power source.
2. Check connection between the power cable and printer.
3. Turn the printer on using the main power switch at the back of the printer.
4. Turn the printer on using the front panel power switch (Stand-By button). The LED on front panel power switch should light up.
5. Listen for internal printer movement and/or noise.

NOTE: Ensure the printer displays some noticeable internal movement or noise before continuing with this document. If no response from printer is noticed when turned on (i.e. fan noise, vacuum noise, carriage movement, etc) use the work instruction for No Power (bpp90124).

6. If movement or noise is detected, the Front panel assembly is suspected. Continue checking the contrast as listed below.

Checking contrast

1. Turn the printer off for 20 seconds then back on.
2. Wait three minutes.
3. Press the Down Arrow four times, and then press the Enter key (entering the Printer Setup menu).
4. Press the Down Arrow six times (for a PS model) or five times (for a non-PS model), and then press Enter (entering the Utilities menu).

NOTE: The menu is slightly different between Postscript (PS) ® models (1055CM, 1055CM Plus) and non-PS models (1050C, 1050C Plus).

5. Press Enter again to select Display Contrast.
6. Press the Enter key 12 to 15 times to increase Contrast.
7. If the Front panel display does not light up properly, replace the Front panel assembly (refer to pg. 8-6 of the 1000 Series Service Manual).

NOTE: If removal and installation instructions are needed for reference during any repairs performed, refer to the 1000 Series Service Manual available on the Computer Care Web site for review or download.

8. After replacing the Front panel assembly, turn the printer on and verify functionality.

Multi-Roll feeder disassembly

Only remove the corresponding side cover of the Multi-Roll that requires maintenance. For example, only remove the right side cover of Multi-Roll if only the right end cover of the printer requires removal to complete the necessary service. Follow the steps listed below to gain access to the printer to complete the necessary service.

NOTE: Only ONE CE needs to be dispatched to perform service on a 1000 Series printer attached to a Multi-Roll feeder.

Removing the Multi-Roll feeder left side cover

WARNING: Turn both the printer and the Multi-Roll feeder off and disconnect them from the power source prior to performing any maintenance.

1. Open the left door of the Multi-Roll feeder.
2. Loosen the two screws that secure the left door to the Multi-Roll feeder (see Figure 1).

Figure 1: Removing the screws.

3. Remove the left door.

CAUTION: Be careful when removing the door not to break it.

4. Remove the two star screws (Orange) that secure the Front top-cover to the Multi-Roll feeder (see Figure 2).

Figure 2: Removing the two star screws.

5. Remove the Multi-Roll feeder top cover.
6. Remove six T-20 screws that secure the left side cover to the Multi-Roll feeder from the front (see Figure 3).

Figure 3: Removing the six T-20 screws.

7. Remove the seven T-20 screws that secure the left side cover to the Multi-Roll feeder from the rear (see Figure 4).

Figure 4: Removing the seven T-20 screws.

8. Remove the left side cover (see Figure 5).

Figure 5: Removing the left side cover.

Removing the Multi-Roll feeder right side cover

WARNING: Turn both the printer and the Multi-Roll feeder off and disconnect them from the power source prior to performing any maintenance.

1. Remove the right door and front top cover from the Multi-Roll feeder (follow Steps 1 through 5 of the previous section and remove the right door instead of the left).
2. Remove six T-20 screws that secure the right side cover to the Multi-Roll feeder from the front (see Figure 6).

Figure 6: Removing the six T-20 screws.

3. Remove nine T-20 screws that secure the right side cover to the Multi-Roll feeder from the rear (see Figure 7).

Figure 7: Removing the nine T-20 screws.

4. Open the Rear Top cover (see Figure 8).

Figure 8: Opening the Rear Top cover.

5. Release the cable that is attached to the top of the right side cover (see Figure 9).

Figure 9: Releasing the cable.

6. Remove the right side cover (see Figure 10).

Figure 10: Removing the right side cover.

Installation of covers

Follow the procedures listed above in reverse order.

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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