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MX-DE27  OPERATIONAL DESCRIPTIONS  5 – 3

D1PRED1

D1MDC

D2MDC

D1PRED3

D1PRED2
D1PRED4

D2PRED1
D2PRED3

D2PRED2
D2PRED4

D1PQD

D2PQD

D1ULD

D1PED

D2ULD

D2PED

D1PPD

D2PPD

1

2

3

4

5

6

6

7

8

9

10

11 13

13

12

DPFM

DPTRC

D1LM

D2LM

D1PFC

D2PFC

MX-DE27  OPERATIONAL DESCRIPTIONS  5 – 4

D1LM

Paper feed tray 3 lift-up motor

This motor lifts up the tray in paper feed tray.

D1MDC

Paper feed tray 3 mount detect 
connector

This detector detects when paper feed tray is attached.

D1PED

Paper feed tray 3 paper empty  
detector

This detector detects when there is paper in paper feed tray.

D1PFC

Paper feed tray 3 paper feed clutch

This clutch controls the ON/OFF status of the paper feed roller (paper feed tray 3).

D1PPD

Paper feed tray 3 paper pass 
detector

This detector detects when paper is in the transport path for paper feed tray.

D1PQD

Paper feed tray 3 paper quantity 
detector

This detector detects the amount of paper remaining in paper feed tray.

D1PRED1

Paper feed tray 3 paper rear edge 
detector 1

The paper feeder recognizes that the tray for paper feed tray has been inserted when any of paper feed tray 
paper rear edge detector 1 to 4 turns ON.
This detector detects the paper size of the tray in paper feed tray.

D1PRED2

Paper feed tray 3 paper rear edge 
detector 2

D1PRED3

Paper feed tray 3 paper rear edge 
detector 3

D1PRED4

Paper feed tray 3 paper rear edge 
detector 4

D1ULD

Paper feed tray 3 upper limit 
detector

This detector detects when the tray in paper feed tray reaches its upper limit.

D2LM

Paper feed tray 4 lift-up motor

This motor lifts up the tray in paper feed tray.

D2MDC

Paper feed tray 4 mount detect 
connector

This detector detects when paper feed tray is attached.

D2PED

Paper feed tray 4 paper empty  
detector

This detector detects when there is paper in paper feed tray.

D2PFC

Paper feed tray 4 paper feed clutch

This clutch controls the ON/OFF status of the paper feed roller (paper feed tray 4).

D2PPD

Paper feed tray 4 paper pass 
detector

This detector detects when paper is in the transport path for paper feed tray.

D2PQD

Paper feed tray 4 paper quantity 
detector

This detector detects the amount of paper remaining in paper feed tray.

D2PRED1

Paper feed tray 4 paper rear edge 
detector 1

The paper feeder recognizes that the tray for paper feed tray has been inserted when any of paper feed tray 
paper rear edge detector 1 to 4 turns ON.
This detector detects the paper size of the tray in paper feed tray.

D2PRED2

Paper feed tray 4 paper rear edge 
detector 2

D2PRED3

Paper feed tray 4 paper rear edge 
detector 3

D2PRED4

Paper feed tray 4 paper rear edge 
detector 4

D2ULD

Paper feed tray 4 upper limit 
detector

This detector detects when the tray in paper feed tray reaches its upper limit.

DPFM

Desk paper feed motor

This motor drives the paper feed and transport sections.

DPTRC

Desk paper transport clutch

This clutch controls the ON/OFF status of the  transport roller 3, vertical transport roller 1, transport roller 5 
and vertical transport roller 2.

1

Paper pickup roller (Paper feed tray 3)

Feeds paper to the paper feed roller.

2

Paper feed roller (Paper feed tray 3)

Feeds paper to the paper transport section.

3

Separation roller (Paper feed tray 3)

Separates paper to prevent double feed.

4

Transport roller 3 (Drive)

Transports paper from the paper feed roller to the transport roller 4.

5

Transport roller 3 (Idle)

Applies a pressure to paper and the transport roller to provide a transport power of the transport roller to 
paper.

6

Transport roller 4

Transports paper from the transport roller 3 to the vertical transport roller 1.

7

Vertical transport roller 2 (Drive)

Transports paper from the transport roller 6 to the vertical transport roller 1.

8

Paper pickup roller (Paper feed tray 4)

Feeds paper to the paper feed roller.

9

Paper feed roller (Paper feed tray 4)

Feeds paper to the paper transport section.

10

Separation roller (Paper feed tray 4)

Separates paper to prevent double feed.

11

Transport roller 5 (Drive)

Transports paper from the paper feed roller to the transport roller 6.

12

Transport roller 5 (Idle)

Applies a pressure to paper and the transport roller to provide a transport power of the transport roller to 
paper.

13

Transport roller 6

Transports paper from the transport roller 5 to the vertical transport roller 2.

MX-DE27  OPERATIONAL DESCRIPTIONS  5 – 5

The paper empty detector (C2PED, D1PED, D2PED) checks whether there is paper in the tray when the tray is lifted and stopped at a position 
where it can feed paper, as well as during paper feed operation. 

The size of paper contained in each tray is detected based on the 
status of each of desk rear edge detectors (switches) 1 to 4 as well 
as on the destination-specific settings. 

F: ON   X: OFF

F: ON   X: OFF

The paper feeder detects the amount of paper remaining in the tray as one of four levels , and displays the level it has detected. 

The paper feeder determines the remaining paper level based on how many times the paper level detector turns ON during the time between 
the start of the lift-up of the paper feed tray and the activation (turning ON) of the upper limit detector. 

C2SS2

D1PRED2

D2PRED2

C2SS1

D1PRED1

D2PRED1

C2SS3

D1PRED3

D2PRED3

C2SS4

D1PRED4

D2PRED4

 

A3W

X

F

×

F

A3

X

F

F

F

B4

X

F

F

X

A4R

F

X

F

X

B5R

F

X

X

F

A4

F

F

X

F

B5

F

F

X

X

8.5  x  13

F

F

F

X

11  x  17

X

F

F

F

8.5  x  14

X

F

F

X

8.5  x  11

F

F

F

F

7.25  x  10.5R

F

X

X

F

8.5  x  11R

F

X

F

F

Paper empty detector detects 

when there is no paper remaining.

1/3 range

Sensor: logical Low

2/3 range

Sensor: logical High

3/3 range

Sensor: logical Low

When there is no paper

Paper level 1/3 position

Paper level 2/3 position

Paper level 3/3 position

Rotary panel

Paper empty detector

(C2PED, D1PED, D2PED)

Actuator for detecting the 

amount of remaining paper

Paper level detector

(C2SPD, D1PQD, D2PQD)

 

No part of this publication may be reproduced,
stored in a retrieval system, or transmitted in
any form or by any means, electronic, mechanical,
photocopying, recording, or otherwise, without
prior written permission of the publisher.

ALL RIGHTS RESERVED.

The PWB’s of this model employs lead-free solder. The “LF” marks indicated on the PWB’s and the Service Manual mean “Lead-Free” solder.

The alphabet following the LF mark shows the kind of lead-free solder.

When repairing a lead-free solder PWB, use lead-free solder thread.

Never use conventional lead solder thread, which may cause a breakdown or an accident.

Since the melting-point of lead-free solder thread is about 40°C higher than that of conventional lead solder thread, the use of the 
exclusive-use soldering iron is recommended.

Since the melting-point of lead-free solder is about 220°C, which is about 40°C higher than that of conventional lead solder, and its soldering 
capacity is inferior to conventional one, it is apt to keep the soldering iron in contact with the PWB for longer time. This may cause land 
separation or may exceed the heat-resistive temperature of components. Use enough care to separate the soldering iron from the PWB when 
completion of soldering is confirmed.

Since lead-free solder includes a greater quantity of tin, the iron tip may corrode easily. Turn ON/OFF the soldering iron power frequently.

If different-kind solder remains on the soldering iron tip, it is melted together with lead-free solder. To avoid this, clean the soldering iron 
tip after completion of soldering work.

If the soldering iron tip is discolored black during soldering work, clean and file the tip with steel wool or a fine filer.

5mm

Lead-Free

Solder composition
code (Refer to the
table at the right.)

Solder composition

Sn-Ag-Cu

Sn-Ag-Bi
Sn-Ag-Bi-Cu

Sn-Zn-Bi

Sn-In-Ag-Bi

Sn-Cu-Ni

Sn-Ag-Sb

Bi-Sn-Ag-P
Bi-Sn-Ag

a

b

z

i

n

s

p

Solder composition code

a