Error Messages and Codes 3-17
Misfeed at Tray 1 (MPT): Jam T1
Paper fed from Tray 1 (MPT) did not reach the Registration Sensor on time.
Applicable Status Code:
Code 155: Misfeed at Tray 1
Initial Actions:
■ Ensure that Tray 1(MPT) is securely attached to the printer.
■ Try picking paper from a different tray.
■ Check the paper path for obstructions or debris.
■ Ensure that the media guides are set correctly.
■ Cycle printer power.
■ If the problem persists, follow the procedure below.
Troubleshooting Reference Table
Applicable Parts Wiring and Plug/Jack References
■ Feed Roller Assembly MPT, PL5.3.20
■ Interlock Switch, PL9.1.11
■ Registration Sensor, PL4.1.3
■ Feed Solenoid, PL5.3.9
■ Registration Roller Assembly, PL4.2.1
■ Main Drive Assembly, PL8.1.2
■ Print Engine Map 1 P/J Locator (page 10-5)
■ Print Engine Power Wiring Diagram (page 10-17)
■ Print Engine Drive Wiring Diagram (page 10-19)
■ Print Engine Paper Feed Wiring (page 10-26)
Troubleshooting Procedure Table 
Step Actions and Questions Yes No
1
Check the following for evidence of fault or 
damage:
■ Feed Roller Assembly MPT, 
PL5.3.20
■ Tray 1 (M PT )
■ Registration Sensor, PL4.1.3
■ Main Drive Assembly, PL8.1.2
Remove any foreign objects or paper 
debris from the paper path.
Is there any damage?
Replace any 
damaged or 
excessively worn 
parts.
Go to Step 2.
2
Test the Registration Sensor.
Run the Service Diagnostics Registration 
Sensor test.
Does the sensor function correctly?
Go to Step 6. Go to Step 3.