Specifications
Chapter 6: FRU Replacement and Fault Isolation Procedures
6-33
6.2.16 Malfunctioning LCD
NOTES:
1. Without the diagnostic tool, skip step 2.
2. There is no corresponding control panel message.
3. This FIP may also fix ESS (controller) problems.
DO NOT USE THIS FIP, except the initial analysis step 1. Check the ESS (controller) and
the interconnect PWB). Also check for power and functionality on:
• P/J 50 (the controller to interconnect PWB to the control panel, also known as the
console)
• P/J 51 (the controller to interconnect PWB to LVPS)
Note:-P/J 20 is unused (for Diagnostic tool, only)
1. INITIAL ANALYSIS
Inspect the following components. Are they compatible with your printer version, correctly
installed, not damaged, deformed, or contaminated?
• MCU PWB Controller (ESS)
• LVPS Assembly Interconnect PWB
• Console 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. ROM DATA ANALYSIS
Is the parameter for Configuration Code B correct?
Yes No
Go to Step 3. Correct the parameter for the controller .
3. LVPS ANALYSIS
Disconnect P/J111 from the HVPS. Perform this test within 30 seconds after switching power on.
After 30 seconds, the LVPS shuts down with a no-load condition.
Switch ON Main Power.
Is there +5VDC between P/J 20–3 and P/J 20–2 on the MCU PWB?
Yes No
Go to Step 4. Go to Section 6.3.1
LVPS Assembly (+5VDC) Failure.