Lexmark X925 7541-03 series, Service Manual

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Diagnostic aids
3-43
7541-03x
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Duplexing
If a page is two-sided, a signal is sent to the Printer Controller Board once the trailing edge of the paper passes
the Fuser Exit Sensor. The leading edge of the paper partially feeds from the Exit Rolls and then reverses
direction and feeds into the Duplex Unit. This method of re-feed is called a “Peek-a-boo”.
The Duplex Entry Rollers pass the paper down to the Duplex Transport Rollers along the right side of the printer.
Once the paper reaches the bottom, the Duplex Exit/MPF detection lever senses the leading edge of the media
at the Duplex Exit Roller and it engages the Duplex re-feed clutch to transport the sheet of paper into the EP
paper path.
Note: Once the media reaches the Duplex Exit/MPF detection lever, it shares the same paper path as the
MPF.
Tr a nsfer roll
P a per
P a per
P a per
MPF Registr a tion roller
Duplex entry roller
Duplex clutch
Lower duplex tr a nsport roll
Duplex / MPF sensor a ctu a tor
Timing belt
Timing belt
Timing belt
Exit roll
Fuser exit roll
P a per exit sensor
S td Registr a tion roller
Duplex exit roll
ᓙᯏᬌ⍮㩤㩔㩨㨺
Registr a tion
S ensor
P a per
(Delivery roll)