Specifications

Chapter 6: FRU Replacement and Fault Isolation Procedures
6-35
6.2.17 Inoperative key pad
NOTES:
1. Without the diagnostic tool, skip step 2
2. There is no corresponding control panel message for this
3. ESS (controller)
4. DO NOT USE THIS FIP except the initial analysis step 1 (and include the ESS (controller)
and the interconnect PWB) Also check for power and functionality on P/J 50 (the controller to
interconnect PWB to control panel also known as the console) and on 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. It is clear of foreign matter such as staples, paper clips, and paper
scraps?
Yes No
Go to Step 2 Replace the relevant components.
2. 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 20–10 and P/J 11–2 on the MCU PWB?
Yes No
Go to Step 3 Go to 3.1 LVPS Assembly (+5VDC) Failure.