188 Theory of operation ENWW
Duplex feed mode
The printer has the following 3 different feed modes for duplex printing. The possible feed modes
depend on the print mode and paper size.
1 1 sheet feed: Print 1 sheet two-sided page in 1 duplex print operation.
2 2 sheets feed: Print 2 sheets two-sided page in 1 duplex print operation.
3 Alternate feed: Print two-sided sheets while retaining 3 sheets in process inside the printer
during duplex print operation.
The table below shows the conditions of available duplex feed.
The duplex feed mode can be selected by command from the formatter. Please note that the
duplex print is available only for the media in the print mode (plain, thin, gloss paper, gloss film)
shown in the table.
Jam detection
This printer has the following sensors to detect the presence and positions of papers:
● registration paper sensor (PS4)
● fuser front paper sensor (PS6)
● fuser delivery paper sensor (PS7)
● face-down delivery paper sensor (PS8)
● reversed paper sensor (PS9)
● duplexing feed paper sensor (PS10)
The microcomputer (CPU) in the DC controller identifies a paper jam by checking whether the
paper is present at the sensor at the checking time. The checking time is stored in its memory.
When it judges so, the CPU stops the printer and sends a paper jam notice to the formatter.
The following is the timing of the paper jam detection. The specified time (T) is based on the
normal feed speed (1/1).
1 Pickup delay jam: This printer checks the paper movement at all pickup sources twice, if
necessary, as the paper pickup can be delayed due to a pickup error.
When paper does not reach the registration paper sensor (PS4) within the allotted time after
paper pickup, the CPU judges it a pickup delay jam.
2 Pickup stationary jam: When the paper does not pass the registration paper sensor (PS4)
within the allotted amount of time after paper is fed from the registration roller, the CPU judges
it a pickup stationary jam.
Table 5-7 Conditions of available duplex feed
Paper size Print mode Duplex feed mode
A4, Letter Plain paper
Gloss paper
Gloss film
1 sheet feed
Plain paper
Thin paper
2 sheets feed
Alternate feed
Legal Plain paper, Thin paper 1 sheet feed
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