Xerox 7750DXF - Phaser Color Laser Printer - Page 108

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