You will need to contact support to find out about the snippet. I was unable to find it posted on Xerox.com.
If you have not already resolved this issue, we suggest you search our online knowledgebase for this product: Phaser 7800.
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The User's Guide on page 151 indicates that the temperature can be adjusted.
Download the appropriate fuser adjustment PostScript snippet file from
www.xerox.com/office/7800drivers. There are several temperature adjustment files for each
but I can not find these files, where to download? Thanks.