T642 still gives error.

[fixthecopier]

The machine had a 920 fuser error when you would turn it on, I changed the fuser and it cleared. Now they call back and say it is coding every once in a while. Any Ideas??

[prntrfxr]

What is the sub code? There are like 4 pages in the service manual for sub codes for the 920 error. Some are fuser related and others have to do with LVPS and proper line voltage.

[Silvertoast]

had a lil lex printer do that, it was the power supply.

[fixthecopier]

What is the sub code? There are like 4 pages in the service manual for sub codes for the 920 error. Some are fuser related and others have to do with LVPS and proper line voltage.

I beleive the sub code was 4

[prntrfxr]

920 .04 Hot roll too cool when
heating to desired
temperature after slope
change (standby control
only). Fuser page count
between 0 and 99,999.
• Bad thermistor, circuit or cabling.
• Fuser not receiving sufficient AC
power.
• Poor supply line voltage.
• Low wattage or incorrect lamp.
• Incorrect hot roll.

Service Check:

1. Fuser lamp
Fuser lamp AC cable
Observe the lamp through the left near side of the printer. It may be
necessary to remove the redrive assembly to observe the lamp
turning on and off. If the lamp does not come on do the following:
• If not previously removed, remove the redrive assembly. See
“Redrive assembly removal” on page 4-75.
• Remove the fuser assembly. See “Fuser assembly removal” on
page 4-27.
• Make sure the correct type of lamp is installed (voltage and
wattage).
• Verify that the fuser to fuser lamp cable is installed correctly to the
fuser top cover assembly. If incorrect, install correctly; if correct,
go to step 2.
2 AC line voltage CAUTION: When taking measurements for AC power, observe all
safety precautions.
Check the AC line voltage to make sure it is within operating
specification. If incorrect, inform the customer; if correct, go to step 3.
3 LVPS CAUTION: When taking measurements for AC power, observe all
safety precautions.
Unplug the AC line cord from the printer and pull the LVPS out far
enough to access CN1 on the LVPS board (see “Low voltage power
supply removal” on page 4-55). Disconnect the LVPS to fuser AC
cable, plug in the line cord, turn the printer on and measure the
voltage between CN1-1 and CN1-3 on the connector (see the
connector locations at “Low voltage power supply” on page 5-10).
If incorrect, replace the LVPS assembly (see “Low voltage power
supply removal” on page 4-55); if correct, go to step 4.
4 Fuser lamp
Fuser top cover assembly
Fuser connect cable (fuser
to fuser lamp cable)
Check continuity of the fuser to fuser AC cable, fuser top cover
assembly, and fuser lamp by checking the continuity between the two
pins on the fuser lamp AC cable connector:
• If there is continuity, go to step 5.
• If there is no continuity, check the continuity of the fuser to fuser
lamp AC cable. If incorrect, replace the lamp, if incorrect, replace
the fuser top cover assembly.
Note: If the fuser lamp is replaced, allow the fuser assembly to cool
or a 925.xx error may be displayed.
5 LVPS
LVPS to fuser AC cable
CAUTION: When taking measurements for AC power, observe all
safety precautions.
Check the AC line voltage between the pins on the fuser end of the
LPVS to fuser AC cable. If the voltage is correct, unplug the AC
power cord from the LVPS cable. If the voltage is correct, unplug the
AC power cord from the LVPS, pull the LVPS out far enough to be
able to check the voltage between CN-1 and CN1-3 on the LVPS
board. Plug in the power cord, turn the printer on and check the
voltage. If correct, replace the LVPS to fuser AC cable; if incorrect,
replace the LVPS assembly.
Note: If the fuses in the LVPS are blown, the LVPS assembly must be
replaced.
6 Fuser top cover assembly
(thermistor, thermistor
cable)
Fuser to system board DC
cable
Check to make sure that the thermistor is installed correctly to J5 on
the fuser control card. If installed correctly check the cable for any
signs of damage. If any problems are found, replace the fuser top
cover assembly. If no problem is found, check the fuser to system
board DC cable for correct installation at J1 on the fuser control card.
If no problem is found, check the fuser to system board cable for
correct installation at J10 on the system board.
7 Error code 920.06
displayed
LVPS
System board
System board to LVPS
cable
Carefully check the installation of the LVPS to system board cable to
J27 on the system board and to CN2 on the LVPS. If the cable is not
seated or installed properly, reseat the cable and retry the printer. If
the cable is installed correctly, replace the following FRUs in the order
shown:
• LVPS assembly. See “Low voltage power supply removal” on
page 4-55.
• System board assembly. See “System board and inner shield
removal” on page 4-77.
• LVPS to system board cable.
8 Fuser assembly If no problem is found up to this point, then replace the following in
the order shown:
• Fuser assembly. See “Fuser assembly removal” on page 4-27.
• System board assembly. See “System board and inner shield
removal” on page 4-77.
• LVPS. See “Low voltage power supply removal” on
page 4-55.