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HP Designjet 400 Series Printers - Flashing Media LED

	Parts required (part numbers are subject to change)
	Troubleshooting steps
	Instructions for Entering Service mode
	Sensors test
	Accuracy calibration

Document number: BPP90080

Last updated: 10-Jan-2003

Minimum skill level: 2

Flashing Media LED can happen for a few different reasons and at different times. If the top cover is open or the pinch arm is down during initialization, this error will occur. Other causes include misaligned paper or the incorrect paper size loaded for the print job. The front panel assembly and pinch arm sensor are the most likely causes of printer failure. 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	Model numbers - C4713A, C4715A, C6080A, C6082A	Model numbers - C4714A, C4716A, C6081A, C6083A
Cutter (required) See note below	C4713-60040	C4713-60040
Front Panel Assembly (required)	C4713-60091	C4713-60091
Pinch Arm Sensor (required)	C4713-60034	C4713-60034
Carriage Assembly (required)	C4713-60039	C4713-60039
Trailing Cable (required)	C4713-60181	C4714-60181
Electronics Module (required)	C4713-69203	C4713-69203

NOTE: The HP Designjet 400 series printers have a very high rate of Cutter assembly failure. Due to this fact, 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 any of the 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. Check that the top cover is closed during initialization.
2. Ensure the pinch arm lever is in the up position during initialization.
3. If the Media LED flashes following initialization, the paper is misaligned. Remove paper and attempt to reload.
4. Verify the correct paper size is being used for the file being printed (for example: Setup sheet can only be printed on 8.5 x 11 in portrait orientation).
5. If the Media LED continues to flash during initialization, enter Service mode and continue with performing a Sensor Service test (this ensures the cover sensor and pinch arm sensor is working properly).

Instructions for Entering Service mode

Service mode 1

1. Hold the REPRINT key down and turn the printer on.
2. Continue to hold the REPRINT key until the LEDs on front panel begin sequencing.
3. Press the appropriate key(s) to perform the necessary test.

Service mode 2

1. Hold the MEDIA SOURCE key down and turn the printer on.
2. Continue to hold the MEDIA SOURCE key until the LEDs on front panel begin sequencing.

NOTE: Service mode 2 contains tests that need a complete initialization or the printer (same as normal operation mode). If a system error occurs while trying to access Service mode 2, turn the printer OFF and enter Service mode 1 to complete the necessary test(s).

3. Press the appropriate key(s) to perform the necessary test.

Sensors test

1. Turn the printer off.
2. Verify the top cover is closed and the pinch arm lever is up.
3. Turn the printer on, entering Service mode 1.
4. Press the MEDIA TYPE key to start the test. The Film, Media, and Sheet LEDs are lit when the corresponding sensor is tripped.
5. Insert paper, open the top cover, or lower the pinch arm level to change the LEDs. Replace sensors as needed. Refer to pages 8-12 of the Service Manual for front panel (top cover sensor) replacement and pages 8-24 for pinch arm sensor replacement.
6. Following replacement, 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.

7. If the Sensor test passes or problems persist, continue with the remaining steps.
8. Replace the Carriage and Trailing Cable (refer to pages 8-37, 8-34 of the Service Manual).
9. Perform an Accuracy calibration and attempt to verify functionality.
10. If the problem persists, replace the Electronics module (refer to pages 8-13 of the Service Manual).
11. Perform an Accuracy calibration (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 in 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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