Specifications

Chapter 6: FRU Replacement and Fault Isolation Procedures
6-48
6.3.5 Heater Rod Failure Continued
4. HEAT ROD ACTUATOR SIGNAL ANALYSIS
Disconnect P/J 111 from the HVPS. Perform these checks within 30 seconds after switching
power ON. After 30 seconds, the LVPS shuts down due to the no–load condition.
Perform these checks when the Fuser Assembly has cooled to room temperature.
Is there +.2VDC between J11–1 and J11–2 on the MCU PWB when you actuate the
interlock switch and the Heater Rod is glowing?
Is there +3.7VDC between J11–1 and J11–2 on the MCU when you deactuate the interlock
switch?
Yes No
Go to Step 5. Go to Section 6.3.6 Temperature Sensor Assembly Failure.
5. HEAT ROD SIGNAL ANALYSIS
Disconnect P/J 111 from the HVPS. Perform these checks within 30 seconds after switching
power ON. After 30 seconds, the LVPS shuts down due to the no–load condition.
Is there +5VDC between P/J11–5 and P/J11–2?
Yes No
Replace the LVPS Assembly. Go to Step 6
6. HEAT ROD SIGNAL ANALYSIS
Disconnect P/J12 from the MCU PWB.
Does the Heat Rod glow?
Yes No
Replace the ROS Assembly. Go to Step 7
7. HEATER ROD SIGNAL ANALYSIS
Remove P/J15 from the MCU PWB.
Does the Heat Rod glow?
Yes No
Replace the CRU Sensor PWB. Replace the MCU PWB.
8. HEATER ROD ANALYSIS
Remove the Heater Rod.
Is there continuity (0
Ω)
between the two ends?
Yes No
Go to Step 9 Replace the Heater Rod.