Error Messages and Codes 3-61
Media Mismatch Errors
Wrong Paper Size; Load Tray 1 (MPT) with [size][type]
Tray 1 (MPT) Paper Size mismatch error.
Applicable Status Code:
Code 176: Wrong Paper Size; Load Tray 1 (MPT) with [size] [type]
Initial Actions:
■ Inspect the tray to ensure that it is free of obstructions, is loaded with 
supported media and the guides are adjusted correctly.
■ Cycle printer power.
■ If the problem persists, follow the procedure below.
Troubleshooting Reference Table
Applicable Parts Wiring and Plug/Jack References
■ Tray 1 (MPT) No Paper Sensor, PL3.2.5 ■ Paper Size Switch Signals table (page 2-7)
■ Print Engine Map 1 - P/J Locator (page 10-5)
■ Print Engine Paper Feed Wiring (page 10-26)
Troubleshooting Procedure Table 
Step Actions and Questions Yes No
1
Check the Tray 1 (MPT) No Paper Sensor 
for evidence of fault or damage:
Is there any damage?
Replace any 
damaged parts.
Go to Step 2.
2
Test the Tray 1 (MPT) No Paper Sensor
Run the Service Diagnostics Tray 1 (MPT) 
No Paper Sensor test. 
Does the sensor function correctly?
Go to Step 4. Go to Step 3.
3
Check all pins on the FRONT/DUP 
Harness for continuity.
1. Disconnect P/J13 and P/J135.
2. Check continuity between J13<=>J135.
Go to Step 4. Replace the 
FRONT/DUP 
Harness.
4
Check the No Paper Sensor signal at the 
Engine Control Board.
Is there 3.3V at P13-15 when actuated?
Replace the No 
Paper Sensor 
(
page 8-45)
Replace the Engine 
Control Board 
(
page 8-104).