Xerox 5400N - Phaser B/W Laser Printer, Service Quick Reference Manual

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126 Phaser 5400 Laser Printer Service Guide
RAP 46 Inoperative Keypad
Control Panel is not operative.
Table 73 Inoperative Keypad Troubleshooting Procedure
Step Actions and Questions Yes No
1 PROCEDURE
1. Enter Diagnostics mode.
2. From the Main Menu, select Component Test / Sensor
Input / press [4] to start, [0] to stop.
Does the printer enter the Diagnostics mode to
the Sensor Input level?
Go to
Step 4. Go to
Step 2.
2
SYSTEM CONTROLLER BOARD P/J18 VOLTAGE
CHECK
1. Disconnect P/J18 on the System Controller Board.
2. Measure the voltages listed in Table 74, between P18
on the System Controller Board and frame ground.
Are all voltages correct per Table 74?
Go to
Step 3. Replace the
System
Controller
Board
[RRP 8.1,
page 305 ].
3 CONTINUITY CHECK
1. Disconnect P/J421 from the Control Panel.
2. Perform a continuity check on all wires from P/J421
and P/J18.
Do all wires check OK for continuity?
Replace the
Control
Panel
Assembly
[PL 1.1,
page 384 ].
Replace the
Wiring
Harness
[PL 9.1,
page 404 ].
4 KEYPAD TEST
Press keypad buttons (1-3 and 5-7) while observing the
LCD.
Note: Keypad numbers increment the LCD counter.
Keypad [4] enters the test and [0] stops the
test.
Does the LCD counter increment each time you
press Keypad numbers (1-3 and 5-7)?
Replace the
System
Controller
Board
[RRP 8.1,
page 305 ].
Replace the
Control
Panel
Assembly
[PL 1.1,
page 384 ].
5 SUSPECT COMPONENTS
The following printer components and areas are
associated with this specific problem. One or more of
these components or areas may have failed partially or
completely. If you cannot isolate this problem using the
steps in this Repair Analysis Procedure, replace each
component or troubleshoot each area listed below, one
at a time, until you isolate and solve the problem.
■
Control Panel Assembly [PL 1.1, page 384 ]
■
Wiring Harness Assembly, System Controller Board to
Control Panel [PL 9.1, page 404 ]
■
Wiring Harness Assembly, System Controller Board
3.3 V [PL 9.1, page 404 ]
■
Power Supply [PL 9.1, page 404 ]