Affected Products:
Single-Function: CS310, CS410, CS510, CS317, CS417, CS517, C2132
Multifunction: CX310, CX317, CX410, CX417, CX510, CX517 & XC2132
Issue Description:
A "34.04 Incorrect paper size, open [paper source]" message appears when printing duplex using a narrow media.
Solution:
![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
Open the top (front) door to clear any paper stuck on the exit path.
![](https://publications.lexmark.com/media/ids_assets/images/transparent.png)
Make sure the paper used is supported for duplexing.(Use the printer's Users Guide to check "Supported paper sizes, types, and weights" or refer to printer's Media Guide)
LEGACY ID: SO7249
**LEXMARK PARTNER & TSC AGENT SECTION**
Service Action:
Service Parts:
40X7649 – Exit deflector Parts Pack (SFP Only) 40X0411 – Narrow media flag (MFP Only) 40X7301 – Narrow media sensor (B) - Photo sensor and retainer (one per package)
40X7647 – Narrow media cable (C) - Cable parts packet