Xerox 7750DXF - Phaser Color Laser Printer Service Manual page 108

Troubleshooting Procedure
Step Actions and Questions
6 1. Reseat the paper tray.
2. Does SW1-4: indicate H in any
position?
7 1. Pull out and then reseat the problem
tray.
2. Listen for the motor, does the lift motor
operate?
8 1. Did the Error Code 87 clear from the
front panel?
9 1. Using service diagnostics check the
level sensor and no paper sensor.
2. Does the level indicate H?
10 1. While still in diagnostics, pull out tray 2.
2. Does SW(3,4,5)-4: indicate LLLL?
11 1. Reseat the paper tray.
2. Does SW(3,4,5,)-4: indicate H in any
position?
3-42
Yes
Replace the paper
feed motor.
Go to step 8.
Complete. This
could be an
intermittent
problem. If the
problem returns,
replace in order:
tray level
sensor
engine
interface board
Replace in order
until resolved:
tray level
sensor
no paper
sensor
LTA or HCF
control board
engine
interface board
engine control
board
Replace in order
until resolved:
paper-select
switch assembly
engine
interface board
engine control
board
Replace the paper
feed motor.
Phaser 7750 Printer Service Manual
No
Replace in order
until resolved:
paper-select
switch assembly
engine
interface board
engine control
board
Go to step 9.
Replace the
engine control
board.
Go to step 10.
Go to step 11.
Replace in order
until resolved:
paper-select
switch assembly
engine
interface board
engine control
board.