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HP Designjet 400 Series Printers - No Power

	Parts required (part numbers are subject to change)
	Troubleshooting steps
	Accuracy calibration

KRS document number: BPP90081

Last updated: 01-May-2002

Minimum skill level: 2

The printer shows no signs of power when turned on. Some possible causes are a poor electrical supply (main power to printer), a bad cable connection, or a faulty front panel or electronic module. Use the steps listed in this document to accurately determine the cause of the failure and replace the appropriate parts.

Parts required (part numbers are subject to change)

Part description	All models
Cutter (required) See note below	C4713-60040
Electronics Module (required)	C4713-69203
Front Panel Assembly (required)	C4713-60091

NOTE: The HP Designjet 400 series printers have a very high rate of cutter assembly failure. Because of this, the cutter assembly must be replaced during any on-site repair (refer to pages 8-21 of the HP Designjet 400 Series Service Manual for teardown procedures). If the cutter appears OK, it still must be replaced at some point during the service call.

Troubleshooting steps

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

1. The printer must be plugged into a known good power source.
2. Check connection between the power cable and printer.
3. Turn the printer on.
4. If same issue appears, turn the printer off and try a different power cord (if available).
5. Open the Top cover and trip the Top cover sensor (use a piece of paper to trip sensor).
6. Turn the printer on.
7. Check for internal movement in the printer.
8. If movement is noticed, the front panel is suspected. Replace the front panel assembly (refer to pages 8-12 of the HP Designjet 400 Series Service Manual). Attempt to verify functionality.

NOTE: If removal and replacement instructions are needed for reference during any repairs performed, refer to the HP Designjet 400 Series Service Manual available on the Partner Care Web site for review or download.

9. If no movement is detected, or problem persists following replacement of the front panel, continue with the remaining steps.
10. Replace the electronics module (refer to pages 8-13).
11. Following replacement, perform an accuracy calibration as listed below, and verify functionality.

Accuracy calibration

1. Place a sheet of polyester film over the top of the printer for approximately 10 minutes to let it stabilize to the environmental conditions. Use a sheet approximately 24 x 36 inches, 61 x 91 cm (D-size). If sheet media is not available, roll media can be used if cut into a 24 X 36 inch sheet. When using polyester film, load it with the matte (dull) side down.

NOTE: If a polyester or matte film is not available, use HP Coated media when performing an Accuracy calibration.

2. Turn the printer off.
3. Press and hold the MEDIA SOURCE key and turn the printer on (entering Service mode 2).
4. Set the Media Type on the front panel to Coated Paper.
5. Load the film with the matte (dull) side down, in portrait orientation.
6. When the Ready LED lights up, press the REPRINT key.

NOTE: The Ready LED will begin to flash. Allow several minutes for the printer to complete the calibration print.

7. The printer will eject the sheet, and the Load Media LED will light up.
8. Unload the sheet from the printer.
9. Wait until the ink on the sheet is dry.
10. Cut the sheet along the dotted line and reload facedown into the printer in the direction indicated by the arrows on the calibration plot.

NOTE: The Ready LED will begin to flash. The printer takes less than 10 minutes to read the calibration sheet, calculate the calibration data, and save the data in the EEROM.

11. Unload the sheet from the printer.
12. The Accuracy calibration is now complete.
13. Turn the printer off then on, and verify printer functionality.

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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