Specifications

Chapter 6: FRU Replacement and Fault Isolation Procedures
6-41
6.3.2 LVPS Assembly failure (+24VDC)
NOTES:
1. This FIP does not use the diagnostic tool.
2. There is no corresponding control panel message for this item.. If 24V is bad, then 12V is
bad, which is used in the control panel (console).
3. Not much will operate without the 24V supply, for example, the fan or motor.
4. Check P/J 51 pins on interconnect PWB for 12V.
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
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. LVPS ANALYSIS
Disconnect P/J111 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.
Switch ON Main Power.
Is there +24VDC between J11–12 and J11–2 on the MCU PWB?
Yes No
Go to Step 3. Replace the LVPS Assembly.
3. INTERLOCK SWITCH ANALYSIS
Actuate the Interlock Switch.
Is there +24VDC between J11–10 and J11–2 on the MCU PWB?
Deactuate the Interlock Switch.
Is there +0VDC between J11–10 and J11–2 on the MCU PWB?
Yes No
Replace the MCU PWB. Replace the LVPS Assembly.
4. Is there 12 VDC between P/J 51-1 and P/J 51-2 on the Interconnect PWB?
Yes No
Replace the controller (ESS). Replace the LVPS Assembly cable.