Specifications

Chapter 6: FRU Replacement and Fault Isolation Procedures
6-50
6.3.6 Temperature Sensor failure
NOTES:
1. The diagnostic tool is not used in this FIP
2. If the control panel message is "Failure: 910 Engine Ctrl PCB," suspect the fuser not MCU.
If the control panel message is "Failure: 910 Engine Ctrl PCB" suspect a missing or
unseated fuser or bad temperature sensor on the fuser - not the NVRAM!
3. This FIP may also fix the fuser
4. Don't get involved in this FIP unless you plan on disassembling the fuser. FRUs aren't
supported. Look for fuser lamp to light; Reseat fuser; replace fuser.
1. INITIAL ANALYSIS
Inspect the following components. Are they compatible with your printer version, correctly
installed, not damaged, deformed, or contaminated?
LVPS Assembly MCU PWB
Fuser Assembly Temperature Sensor Assembly
Inspect the printer paper path. Is it clear of foreign matter, such as staples, paper clips, and
paper scraps?
Yes No
Go to Step 2. Replace the problem components.
2. TEMPERATURE SENSOR ASSEMBLY ANALYSIS
Is the Temperature Sensor Thermistor clean?
Yes No
Go to Step 3. Clean or replace the Temperature Sensor Assembly.
3. TEMPERATURE SENSOR THERMISTOR ANALYSIS
Perform this check when the Fuser Assembly has cooled to room temperature.
Disconnect the AC power plug from the back of the printer.
Is the resistance between J 101–1 and J 101–4 on the Fuser Assembly between 110 and
350 K
ΩΩ
?
Yes No
Go to Step 4. Replace the Temperature Sensor Assembly.
4. LVPS ASSEMBLY ANALYSIS
Perform this check when the Fuser Assembly has cooled to room temperature.
Disconnect the AC power plug from the back of the printer.
Is the resistance between J 11–13 and J 11–14 on the MCU PWB, 110 to 350 Kohms?
Yes No
Replace the MCU PWB. Replace the LVPS Assembly.