FRU

Action

 

 

 

6

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 4-26.

 

 

System board assembly. See “System board and inner shield

 

 

 

removal” on page 4-76.

 

 

LVPS. See “Low voltage power supply removal” on

 

 

 

page 4-54.

 

 

 

 

923.xx—Hot fuser service check

Error Code 923.xx, 924.xx, and 925.xx may display for a hot fuser failure.

CAUTION: .The fuser may be hot, use caution before removing or servicing.

CAUTION: There is a danger from hazardous voltage in the area of the printer where you are working. Unplug the printer before you begin, or use caution if the printer must receive power in order to perform the task.

Service tip: Set the Fuser Temperature to NORMAL before starting this service check. In Diagnostics mode, In Diagnostics mode, select EP SETUP, and Fuser Temp.

 

FRU

Action

 

 

 

1

Fuser assembly

Check for any signs of overheating in the fuser assembly. Check the

 

 

hot roll, hot roll bearings, and the area around the thermistor for any

 

 

signs of excessive heat. If a problem is found, replace the thermistor.

 

 

If no problem is found, go to step 2.

 

 

 

2

Fuser top cover assembly

Turn the printer off and disconnect the fuser to system board cable

 

(thermistor)

from J10 on the system board. Check the resistance between pins

 

 

J10-3 and J10-4. The resistance should be greater than 100K ohms.

 

 

If correct, go to step 3; if incorrect, disconnect the thermistor cable

 

 

from J5 on the fuser board and measure the resistance between the

 

 

two pins on the thermistor cable. If incorrect, replace the fuser top

 

 

cover assembly (see “Fuser narrow media sensor removal” on

 

 

page 4-34); if correct, replace the fuser to system board cable.

 

 

 

3

System board

Check the voltage on J10-3 ground on the system board. The voltage

 

Fuser top cover assembly

should measure approximately +3.3 V dc. If the voltage is correct,

 

replace the fuser top cover assembly. See “Fuser narrow media

 

 

 

 

sensor removal” on page 4-34. If incorrect, replace the system

 

 

board. See “System board and inner shield removal” on

 

 

page 4-76.

 

 

 

2-90Service Manual

Page 126
Image 126
Toshiba e-STUDIO500P manual Xx-Hot fuser service check, Cover assembly see Fuser narrow media sensor removal on