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HP Designjet 500 and 800 Series Printers - TWI: Noise During Media/Paper Advance

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

KRS document number: BPP90163

Last Updated: 27-Nov-2001

Minimum skill level: 2

An unusual noise is heard when the media advances. The "noise" is usually heard from the left side (rear) of the printer. 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	24 Inch Model Numbers - C7769B, C7769C, C7779B, C7779C	42 inch Model Numbers -C7770B, C7770C, C7780B, C7780C
Drive Roller Kit (Required)	C7769-60276	C7770-60260
Transmission Gear Kit (Required)	C7769-60177	C7769-60177

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 Partner 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 as instructed below. If functionality is verified, no additional parts should be replaced.

1. If roll media is being used, verify the roll length does not exceed 150 feet. Roll media of a greater length may cause premature failure of the Paper-Axis Motor due to too much tension along the paper path.
2. Determine if the noise is normal. Some noise is normal, specifically; it is normal to hear the media moving along the paper path. If a high-pitched "whine" or "whistle" is heard it may be caused by use of a non-standard size of sheet or roll media.
3. If a non-standard size sheet or roll of media is being used, check if when the media is advancing it is temporarily covering a vacuum hole causing the high-pitched whine or "whistle" to occur. If so try using a Bond media that is a standard size (i.e. 8 ½ x 11).

NOTE: If the noise does not occur with a standard size media, the non-standard size media is causing the noise and not the printer. Suggest using standard media sizes to eliminate the noise.

4. If the issue persists, replace the Drive Roller and the Transmission Gear Kit (refer to pg. 8-84, 8-93 of the 500/800 Series Service Manual).
5. Following replacement, turn the printer On and attempt to verify functionality.

Verifying functionality

1. Turn the printer On.
2. From the main front-panel menu, select the Paper menu and press ENTER.
3. Select Load Sheet or Load Roll and press ENTER.
4. Load media into the printer.
5. Follow the instructions on the Front panel.

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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