Why I got the message "close cover - upper cover open" ?

check the connector that the fuser connects to for damage. If the plug is intact you will probably need to replace the power supply (Low Voltage PS) C8546-69003 is the part number

on a unit of this vintage the part won't be cheap. A quick search on the net shows it from $350 - $600

Good luck

turn the printer off and reinstall the unit after it has cooled off (30 minutes). Then open cover B and D. Remove the fuser unit, then reinstall it properly. Close covers D and B. The error clears automatically if the fuser unit is properly installed.

If the error is not cleared, the fuser unit is out of order. Replace it with a new fuser unit.

re install the printer drivers or
reset the printer by eject the power and data cable for a one minite

You might try taking out the fuser and replacing it. First of all, I'd let the machine sit for at least 30 minutes if you've recently printed anything, as it needs time to cool down. After that, press the button on the upper right side of the device to release the cover. Then release the chute gate to its upright position. Release the two tabs on each side of the fuser to unlock the unit and slowly pull it out of the machine. To replace it, push the fuser connectors into the slot firmly to make sure it is properly seated . Lastly, close both of the levers you opened earlier to remove the fuser. Make sure the chute is also lowered to the position it was in before. You can then close the front cover. Hopefully that will resolve all your printer issues. If not, you may need to contact a support technician. Good luck!

Hi. You have to follow these steps: Be very careful:

1. Open front cover, like in this image:


2. Pull out your printer's toner cartridge & drum unit:


3. Open back cover


4. Pull the tab which is in front of you in order to open the rear chute cover.


5. If there is any, pull the jammed paper out of the fuser.




6. Close back cover and put the cartridge toner & drum unit back where it belongs.


7. Close front cover too and see if it works! If your error will still appear, try powering your printer OFF & ON

I hope I helped you!

-922 Fuser Error messages indicate that the fuser unit failed to reach the standby temperature.
If this is the first time you have seen the error, turn the printer off and on.
-Leave the printer off for at least 10 seconds before turning it back on. This gives the printer's engine board a chance to reset.
If this is an intermittent error, you may want to check how the printer is plugged in, even if it has worked on this surge device for months. Make sure the printer is plugged straight to the wall and not through a surge device or power strip. Power strips and uninterrupted power supplies can cause a low amperage problem in your printer which can trigger a false fuser error.
If this does not help or if this error appears every time the printer is powered on, you will probably need service on the machine.

- 923 Fuser Error indicates that the fuser unit is getting too hot while printing or when the printer is idle. Make sure that nothing is stuck inside the fuser unit that can cause the fuser unit to overheat. To check for any stuck sheets of paper in the fuser unit:
Locate the rear door and open it. The rear door opens and drops down towards you.
Look into the back of the printer. See if there is any paper or any other item stuck there that could be causing the fuser unit to overheat.
If you cannot find anything jammed up or broken in the back of the printer, open the upper front cover of the printer and remove the toner cartridge. Look into the printer from the front. See if you can see anything jammed into the back area of the printer.
If nothing appears to be jammed in the printer, the fuser unit or the main power supply of the printer will probably need to be replaced to fix this problem.

This error comes when media doesn't come to fuser delivery sencor with in the specified time it may be due to improper paper picking or fault in registration ***...
clean the paper feed rooler & registration *** path ur problem will resolve defin...........

1 Unplug the power cable.
2 Remove the paper delivery tray assembly
3 Remove two (2) screws from the right cover assembly
4 Remove the right cover assembly, carefully disengaging the catches
5 Unplug the control panel cable.
6 Insert a screwdriver to loosen the release tab on each side of the upper face cover
7 Remove the upper face cover
8 Remove four (4) screws from the upper cover
9 Lift up and remove the face-down cover
10 Remove the output tray by releasing the tabs.
11 Unplug the harness from the fuser motor
12 Open two (2) clips and remove one (1) clip to remove the fuser connector.
13 Unplug two (2) 3-pin optical encoder wires
14 Unplug the red high-voltage bias wire.
15 Remove the thermistor wire.
16 Remove the cables from the wiring harness.
17 Remove three (3) screws from the fuser chassis.
18 Gently rocking if necessary, roll the fuser forward to remove.
Use the following procedure to replace the fuser.
1 Align the fuser tabs with their respective holes.
2 Complete replacement by following steps 1 through 18 above in reverse order.
NOTE When replacing the right cover, align the tabs on the upper edge of the right cover
and lower edge of the face-down cover with their respective slots.
Hope this helps

1 Unplug the power cable.
2 Remove the paper delivery tray assembly
3 Remove two (2) screws from the right cover assembly
4 Remove the right cover assembly, carefully disengaging the catches
5 Unplug the control panel cable.
6 Insert a screwdriver to loosen the release tab on each side of the upper face cover.
7 Remove the upper face cover
8 Remove four (4) screws from the upper cover
9 Lift up and remove the face-down cover
10 Remove the output tray by releasing the tabs.
11 Unplug the harness from the fuser motor
12 Open two (2) clips and remove one (1) clip to remove the fuser connector.
13 Unplug two (2) 3-pin optical encoder wires.
14 Unplug the red high-voltage bias wire.
15 Remove the thermistor wire.
16 Remove the cables from the wiring harness.
17 Remove three (3) screws from the fuser chassis.
18 Gently rocking if necessary, roll the fuser
Use the following procedure to replace the fuser.
1 Align the fuser tabs with their respective holes.
forward to remove.
2 Complete replacement by following steps 1 through 18 above in reverse order.
NOTE When replacing the right cover, align the tabs on the upper edge of the right cover
and lower edge of the face-down cover with their respective slots.

To test fuser out of circuit make sure lamp and thermal fuse are not open circuit, and thermister is neither open or shorted


Fuser repair procedure from tec manual.
Fuser Failure (U4-1, U4-2, & U4-3)
1 Switch off printer main power. Remove the Fuser Full Cover so you can observe the Heat Rods. Switch on printer main power and observe the ends of the Fuser Assembly. The Heat Rods glow.?
Y N
| Go to step 5.
2 Replace the Printer Engine Controller PWB (REP 4.10.6). The error message reappears.
Y N
| Problem solved.
3 Replace the Fuser Assembly The error message reappears.
Y N
| Problem solved.
4 Check for a broken wire or a loose connection
between components
5 Measure the AC voltage between J23-2 and J23-6 on the AC Driver PWB. There is 110VAC (or 220VAC if the printer is the 220VAC model) between J23-2 and J23-6.
Y N
| Go to step 7.
6 Replace the Fuser Assembly (REP 4.7.1). If the problem persists, replace the Printer Engine
Controller PWB (REP 4.10.6).
7 The Fuser cycles up and down.
Y N
| Replace the Printer Engine Controller PWB
8 Measure the voltage between P401-1 and P 401-4 when the Fuser Fan cycles up and down. There is 24VDC between P401-1 and P401-4 when the fan is rotating and 0VDC when the fan is off.?
Y N
| Replace the Printer Engine Controller PWB
9 Replace the AC Driver PWB

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