Diagnostics and troubleshooting
 
125
 
Step 8
 
a
 
Enter the Diagnostics menu, and then navigate to:
 
Printer diagnostics & adjustments 
> 
Sensor tests
 
b
 
Find the sensor (Pass
‑
through (tray 2)).
 
 
Does the sensor status change while toggling the sensor?
 
Step 9
 
Check the sensor cable for proper connection and damage, and 
replace if necessary.
 
 
Does the problem remain?
 
Step 10
 
Check the sensor for damage and replace if necessary. See
 
“Sensor (550-sheet tray pass-through) removal” on page 419
.
 
 
Does the problem remain?
 
Step 11 
a
 
Enter the Diagnostics menu, and then navigate to:
 
Printer diagnostics & adjustments 
> 
Sensor tests
 
b
 
Find the sensor (Pass
‑
through (tray 3)).
 
 
Does the sensor status change while toggling the sensor?
 
Step 12
 
Check the sensor cable for proper connection and damage, and 
replace if necessary.
 
 
Does the problem remain?
 
Step 13
 
Check the sensor for damage and replace if necessary. See
 
“Sensor (550-sheet tray pass-through) removal” on page 419
.
 
 
Does the problem remain?
 
Step 14
 
a
 
Enter the Diagnostics menu, and then navigate to:
 
Printer diagnostics & adjustments 
> 
Motor tests 
> 
Pass- 
through (tray 2)
 
b
 
Touch 
Start
.
 
 
Does the motor run?