Samsung ML-451 Series Service Manual page 30

2. Product Specifications and Description
1 Tray1
2 Tray2
3 Tray3
4 Tray4
5 Tray5
6 Tray1 Pick up/ Retard/ Forward
rollers
7 Tray2 Pick up/ Retard/ Forward
rollers
8 Tray3 Pick up/ Retard/ Forward
rollers
9 Tray4 Pick up/ Retard/ Forward
rollers
10 Tray5 Pick up/ Retard/ Forward
rollers
•
Pick-Up Rollers (Tray1~5, MP Tray)
This rollers pick up the paper from the tray 1~5 or MP tray and transport it to the feed roller.
•
Forward Rollers (Tray1~5, MP Tray)
This roller is placed against the retard roller. It transports the paper from the pickup roller to the feed roller.
•
Retard Roller (Tray1~5, MP Tray)
This roller is placed against the forward roller. When two sheets of paper or more are transported from the pickup roller,
the load of the torque limiter of the retard roller is heavier than the frictional force between the sheets. As a result, the
retard roller is stopped and the lower paper does not advance any further. When only one sheet is transported from the
pickup roller, the retard roller rotates following the forward roller.
•
Feed Roller
This roller transports the paper sent from the forward roller to the registration roller.
•
Registration Roller
Paper transported from the feed roller is pushed against the registration roller which aligns the leading edge of the paper.
Then, the registration rollers rotate to transport the paper to the transfer unit.
•
MP tray paper sensor
This sensor detects whether paper is set in the MP tray. When it is, MP tray feeding always comes before tray 1~5
feeding.
•
Empty Sensor (Tray1~5)
This sensor detects the availability of paper in the tray by using an actuator. When there is no paper in the tray, the
actuator blocks the light path of the sensor, and the sensor determines that there is no paper.
•
Feed Sensor
This sensor detects if the leading edge or trailing edge of the paper has passed the feed roller. It also detects jamming
such as misfeeding.
•
Registration Sensor
This sensor detects that the leading edge of the paper has reached the registration roller and that the trailing edge of
the paper has passed the registration roller.
2-19
11 MP Tray Pick up / Retard /
Forward rollers
12 Tray1 Feed roller
13 Tray2 Feed roller
14 Tray3 Feed roller
15 Tray4 Feed roller
16 Tray5 Feed roller
17 Registration sensor
18 Registration roller
19 Transfer roller
20 Fuser Belt
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21 Exit sensor
22 Exit roller1
23 Exit roller2
24 Exit roller3
25 Duplex drive roller
26 Duplex Sensor
27 Main bin full sensor
28 Mail box or Finisher