HP LaserJet Enterprise M552 - Duplexing unit (M552 dn, M553 dn, M553 x, and M577 only); Duplexing reverse and duplex feed control; Jam detection;prevention

Table 1-21 Print mode and feed speed (continued)
Print mode
Feed speed
1
Media sensor detection
Glossy media 1 1/3 Yes
Glossy media 2 1/3 Yes
Glossy media 3 1/3 Yes
Glossy lm 1/3 Yes
Envelope 1 1/2 No
OHT 1/3 Yes
Label 1/2 No
Designated media 1 1/2 No
Designated media 2 1/3 No
Designated media 3 Pro No
1
Speed for both full color and black and white pages
1/1 speed = 210 mm/s
Pro speed = 174 mm/s
1/2 speed = 105 mm/s
1/3 speed = 70 mm/s
Duplexing unit (M552dn, M553dn, M553x, and M577 only)
The duplexing unit reverses the paper and feeds it through the paper path to print the second side.
Duplexing reverse and duplex feed control
The duplex reverse control reverses the paper after the rst side is printed and feeds it to the duplex re-
pickup position to print the second side of the page.
1. At a specied time after the rst side of a page is printed, the duplex reverse motor rotates, and the
duplex reverse solenoid is turned on.
2. The duplex apper moves, and the paper feeds to the duplex reverse unit.
3. After a specied period of time, the duplex reverse motor reverses, and the paper feeds to the duplex
feed unit.
4. The duplex reverse motor and the pickup motor move the paper to the duplex re-pickup position.
5. The duplex reverse motor and the duplex feed clutch stop, and the paper feed operation pauses.
6. After a specied period of time, the duplex reverse motor rotates, and the duplex feed clutch is turned
on. The paper is then picked up again.
Jam detection/prevention
The printer uses the following sensors to detect the paper as it moves through the paper path and to report
to the DC controller if the paper has jammed.
●
Top of page (TOP) sensor (SR6/SR6N)
●
Media width sensor (front, SR13/SR13N)
60 Chapter 1 Theory of operation ENWW