HP laserjet m712 Fehlerbehebungsanleitung

feeds the paper and performs horizontal registration to align the starting position of the main scan for

the second-side print. Then, the paper is fed into the product engine unit again.

Figure 1-62

Duplexer reverse and feed operation

CL1

SR1

SR2

Side

misregistration

sensor

Reverse position

Re-pickup waiting position

Intermediate

output roller

Fuser output sensor

Output roller

Table 1-22

Duplexer reverse and feed components

Component

Signal

Duplex feed motor

DUPLEX FEED MOTOR CONTROL signal

CL1

Duplex feed clutch

DUPLEX FEED CLUTCH signal

SR1

Duplex reverse sensor

DUPLEX FEED signal

SR2

Duplex re-pickup sensor DUPLEX RE-PICKUP signal

Duplexer reverse and feed operation sequence

The operational sequence of the reverse-and-feed operation is as follows:

The paper printed on the first side passes through the fuser.

The DC controller feeds the paper until the trailing edge of paper reaches the reverse position after

the fuser output sensor detects the trailing edge.

The duplex controller reverses the output roller and the intermediate output roller to feed the paper

to the duplexer from the reverse position.

The duplex controller detects the image starting position according to the side misregistration

sensor and feeds the paper to the re-pickup waiting position.

The duplex controller stops the paper temporarily at the re-pickup waiting position when the paper

is standard size but shorter than Letter-R. It feeds the paper to the product engine again if a print

ENWW

Duplexer