HP LaserJet 1160, 1320, Service Manual

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7 Troubleshooting

Chapter contents

 

Chapter contents....................................................................................................................

139

Basic troubleshooting.............................................................................................................

141

Paper-handling problems ......................................................................................................

144

Paper jam .......................................................................................................................

144

Print is skewed (crooked) ...............................................................................................

144

More than one sheet of media feeds through the printer at one time ............................

144

Printer does not pull media from the media input tray ...................................................

145

Printer curled the media .................................................................................................

145

Printed media does not exit to the correct path ..............................................................

145

Print job is extremely slow ..............................................................................................

145

Paper-path troubleshooting....................................................................................................

146

Solving print paper-feed problems..................................................................................

146

Printed page is different than what appeared on screen ......................................................

148

Garbled, incorrect, or incomplete text ............................................................................

148

Missing graphics or text, or blank pages ........................................................................

148

Page format is different than on another printer .............................................................

149

Graphics quality ..............................................................................................................

149

Status light patterns ..............................................................................................................

150

Fatal error secondary messages...........................................................................................

156

Accessory error secondary messages...................................................................................

159

Troubleshooting postscript (PS) errors .................................................................................

160

Image troubleshooting............................................................................................................

161

Print cartridge problems..................................................................................................

161

Solving image-quality problems .....................................................................................

162

Clearing jams ........................................................................................................................

170

Print-cartridge area .........................................................................................................

170

Input trays .......................................................................................................................

172

Output bin .......................................................................................................................

176

Straight-through output path ...........................................................................................

176

Automatic two-sided printing (duplexing) path ...............................................................

178

Functional checks..................................................................................................................

182

Engine test.......................................................................................................................

182

Printing an engine test.....................................................................................................

182

Half self-test functional check..........................................................................................

183

To perform a half self-test check.....................................................................................

183

To perform other checks .................................................................................................

183

Drum rotation functional check .............................................................................................

184

Heating element check...........................................................................................................

185

High-voltage contacts check..................................................................................................

186

To check the print cartridge contacts ............................................................................

186

To check the high-voltageconnector assembly .............................................................

186

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Chapter contents 139

Wired network setup problemsolving ....................................................................................

187

NVRAM initialization...............................................................................................................

188

Cold reset...............................................................................................................................

189

Troubleshooting tools and reference diagrams.....................................................................

190

Repetitive image defects.................................................................................................

190

General timing chart........................................................................................................

191

Circuit diagram.................................................................................................................

192

Solenoids.........................................................................................................................

194

Switches and sensors......................................................................................................

195

Rollers and pads..............................................................................................................

196

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Basic troubleshooting

Table 7-1.Basic troubleshooting

The printer doesn't turn on.

When the product is connected to a correctly grounded power source, the LEDs on the control panel do not light and the main motor does not rotate.

Cause

No power to the printer.

The power inlet/switch cable assembly is defective.

The ECU is defective.

Solution

1.Verify that the power outlet has the correct voltage.

2.Verify that the power cable is correctly plugged into the outlet and the printer.

3.Verify that the power switch is turned on.

Replace the power inlet/switch cable assembly.

Replace the ECU (seeECU).

The printer turns on, but the motor doesn't rotate.

When turned on, the LEDs on the control panel light up, but the main motor does not rotate.

Cause

The print cartridge door is open.

Media is jammed in the paper path.

The motor cable is not connected correctly.

The motor is not mounted correctly in the printer chassis.

A gear is damaged or jammed.

Solution

Close the print cartridge door.

Clear all media from the paper path and make sure that all sensors are working correctly.

Reconnect the motor cable.

Verify that the motor is connected correctly and that it rotates freely.

Replace the gear assembly (see Main gear assembly/tray 2 pickup solenoid).

The ECU is defective.

Replace the ECU (see ECU).

The main motor is defective.

Replace the motor (see Main motor).

The printer is unresponsive.

The printer turns on and the motor rotates, but none of the control panel lights turn on, and pressing the control panel buttons has no effect.

Cause

Solution

The control panel cable is not connected correctly.

Reconnect the control panel cable.

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Basic troubleshooting 141

Table 7-1.Basic troubleshooting (continued)

The printer is unresponsive.

The printer turns on and the motor rotates, but none of the control panel lights turn on, and pressing the control panel buttons has no effect.

Cause

The control panel is defective. The formatter is defective.

Solution

Replace the control panel (see Control panel).Replace the formatter (seeFormatter).

The printer is not "ready."

The printer is on, but the control panel lights indicate that the printer is not in the "ready" state.

Cause

Solution

The printer has an internal error that was detected during the power-onself-testsequence.

Consult the list of control panel light patterns to identify and correct the error (see Status light patterns andFatal error secondary messages).

The printer does not print.

The printer turns on, the motor rotates, and the control panel indicates the "ready" state, but the printer does not print.

Cause

Solution

A printer component is defective.

Perform an engine test to verify print-engine

 

components.

 

1. Press the engine test switch (see Figure

 

7-1. Location of engine-test switch) to print

 

an engine test.

 

2. If the engine test page does not print, check

 

all of the connectors on the ECU and

 

reconnect any cables that are connected

 

incorrectly.

 

3. If, after checking the connectors, the error

 

persists, replace the ECU (see ECU).

The formatter is defective.

Press the GO button to print a Demo page. If the

 

Demo page does not print, replace the formatter

 

(see Formatter).

The printer does not print from a computer.

The printer prints the engine test and the Demo page, but does not print jobs sent from a computer.

Cause

Solution

The cable is not connected correctly.

Reconnect the cable.

An incorrect printer driver is selected.

Select the correct printer driver.

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Table 7-1.Basic troubleshooting (continued)

The printer does not print from a computer.

The printer prints the engine test and the Demo page, but does not print jobs sent from a computer.

Cause

The printer driver is not installed correctly.

Solution

Uninstall and then reinstall the printer software. Make sure that you use the correct procedure and port setting.

Other devices are connected to the printer (for example, through a switch or hub) that are interfering with the computer-printercommunications.

There is a computer-portcommunications problem.

The formatter is defective.

Disconnect the other devices, switches, or hubs.

Reset the computer port settings (see the computer user guide for more information).

Replace the formatter (seeFormatter).

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Basic troubleshooting 143

Paper-handlingproblems

Choose the item that best describes the problem:

Paper jam

Print is skewed (crooked)

More than one sheet of media feeds through the printer at one time

Printer does not pull media from the media input tray

Printer curled the media

Printed media does not exit to the correct path

Print job is extremely slow

Paper jam

See Clearing jams for more information.

Make sure that you are printing with media that meets specifications.

Make sure that you are printing with media that is not wrinkled, folded, or damaged.

Make sure that the printer is clean. See Maintenance for more information.

If you are printing to the straight-throughoutput path, close and open the door again to make sure that the green release levers are closed.

If you are using the automatic two-sidedprinting feature, make sure that the media indicator is set to the correct paper size.

Print is skewed (crooked)

A small amount of skew is normal and might become obvious when using preprinted forms.

See Table 7-2. Solving print paper-feed problems and Table 7-8. Solving print imagequality problems for more information.

Adjust the media guides to the width and length of the media that you are using and try reprinting.

More than one sheet of media feeds through the printer at one time

The media input tray might be too full.

Make sure that the media is not wrinkled, folded, or damaged.

Try paper from a new ream. Do not fan the paper before loading it into the input tray.

The printer separation pad might be worn.

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Printer does not pull media from the media input tray

Make sure that the printer is not in manual feed mode. See Status light patterns for more information.

Make sure that the media guides are adjusted properly.

The pickup roller might be dirty or damaged.

Printer curled the media

See Table 7-2. Solving print paper-feed problems and Table 7-8. Solving print imagequality problems for more information.

Open the straight-throughoutput door to print straight through.

Printed media does not exit to the correct path

Open or close the straight-throughoutput door to reflect the output path that you want to use.

Print job is extremely slow

The maximum speed of the printer is up to 20 pages per minute for the HP LaserJet 1160 printer and up to 22 pages per minute for the HP LaserJet 1320 Series printer. Your print job might be very complex. Try the following:

Reduce the complexity of your document (for example, reduce the number of multiple graphics).

In the printer driver, set the media type to plain paper.

NOTE

This can cause toner to fuse poorly if using heavy media.

 

Add printer memory.

 

Narrow media or heavy media slows printing. Use normal media.

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Paper-handlingproblems145

Paper-pathtroubleshooting

 

Use the following table to solve problems related to moving paper or documents through the

 

product.

 

Failure to solve paper-feedproblems can result in damage to the printer. Damage resulting

CAUTION

 

from high jam-ratesfrom any of the causes shown in this section can void the printer

 

warranty.

 

Solving print paper-feedproblems

 

Table 7-2.Solving printpaper-feedproblems

Pages are coming out curled or wrinkled.

Cause

Solution

Paper curl is inherent to the laser printing processes, and occurs when media is subjected to heat. Curl tends to relax as the paper cools while resting on a flat surface.

Media is curled or wrinkled when using the top output bin.

Paper is not stored properly.

The media is too long for the printer output bin. The fuser temperature is too high.

Make sure that the media meets specifications detailed in the HP LaserJet Printer Family Media Guide.

Open the straight-throughoutput door on the back of the printer to change the media path. Reset the fuser mode to the default.

Whenever possible, store paper in its sealed ream at room temperature.

Use the long media extension.

Select Type is: in thePaper/Quality tab of the printer driver. Make sure that it is set for the appropriate media.

Print is misaligned on the page (skewed pages).

Cause

The main input tray is overfilled.

The media guides are not set correctly, are broken, or are missing.

Solution

Remove some of the media.

Make sure that you center the media with the side media guides. Verify that the guides are not adjusted too tightly or too loosely against the media. Check for broken or missing guides and replace them as needed.

The media's weight or surface finish does not meet HP's specifications.

Make sure that the media meets specifications detailed in the HP LaserJet Printer Family Media Guide.

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Table 7-2.Solving printpaper-feedproblems (continued)

The printer feeds multiple sheets or jams frequently from the main input tray.

Cause

Solution

Paper guides are not adjusted correctly.

Slide the guides against the sides of the stack in the main input tray or the priority input slot to center the media. Make sure that the guides are not adjusted too tightly.

Media was not removed from the main input tray before refilling the tray.

The main input tray is overfilled.

Always remove media from the main input tray before you refill it.

Remove some of the sheets. The main input tray can hold up to 250 sheets of 20-lb.(75 g/m2 ) bond weight paper (or fewer pages of heavier media, a stack no higher than 25 mm).

The paper was poorly cut by the manufacturer and is sticking together.

“Break” the ream of paper by curving it into an upside-downu-shape(do not "fan" the paper); this can effectively decrease multifeeds. Also try turning the paper around to feed the opposite end first, or use a different type of paper.

The media does not meet HP's specifications for print media.

The output capacity was exceeded in the top output bin.

The pickup roller is dirty.

The pickup roller is damaged.

The separation pad is dirty.

The separation pad is damaged.

A sensor is not operating correctly.

Media has already been printed using a laser printer and is now being re-used.

Make sure that the media meets specifications detailed in the HP LaserJet Printer Family Media Guide.

Do not allow more than 125 sheets of 20-lb.(75 g/m2) bond weight paper (less for heavier paper) to fill the top output bin.

Clean the pickup roller.

Replace the pickup roller.

Clean the separation pad. Replace the separation pad.

Check the sensors to make sure that none of them are jammed. Replace sensors as needed.

Do not re-usemedia.

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Printed page is different than what appeared on screen

Choose the item that best describes the problem:

Garbled, incorrect, or incomplete text

Missing graphics or text, or blank pages

Page format is different than on another printer

Graphics quality

Garbled, incorrect, or incomplete text

The wrong printer driver might have been selected when the software was installed. Make sure that the HP LaserJet 1160 or HP LaserJet 1320 printer driver is selected in the printer Properties.

If a specific file prints garbled text, there might be a problem with that specific file. If a specific application prints garbled text, there might be a problem with that application. Make sure that the appropriate printer driver is selected.

There might be a problem with your software application. Try printing from another software application.

The parallel cable might be loose or defective. Try the following:

Disconnect the cable and reconnect it at both ends.

Try printing a job that you know works.

If possible, attach the cable and printer to another computer, and try printing a job that you know works.

Try using a new IEEE-1284Bcompliant parallel cable that is 3 m (10 ft) or less.

Turn off the printer and the computer. Remove the parallel cable, and inspect both ends of the cable for damage. Reconnect the parallel cable, making sure that the connections are tight. Make sure that the printer is directly connected to the computer. Remove any switchboxes, tape backup drives, security keys, or any other devices that are attached between the parallel port on the computer and the printer. These devices can sometimes interfere with communication between the computer and the printer. Restart the printer and the computer.

Missing graphics or text, or blank pages

Make sure that your file does not contain blank pages.

The sealing tape might still be in the print cartridge. Remove the print cartridge, and pull the tab on the end of the cartridge until the entire length of the tape is removed. Reinstall the print cartridge. To check the printer, print a Demo page by pressing the GO button.

The graphic settings in the printer Properties might not be correct for the type of job that you are printing. Try a different graphic setting in the printer Properties. See Advanced Printer Settings window for more information.

Clean the printer, particularly the contacts between the print cartridge and the power supply.

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