SHARP MX3501, MX-3501N, MX-4501N Service Manual

SERVICE MANUAL

CODE: 00ZMX3501/S1E

DIGITAL FULL COLOR MULTIFUNCTIONAL SYSTEM

DUPLEX SINGLE PASS FEEDER (DSPF)

MX-3501N

CONTENTS

[1] PRODUCT OUTLINE . . . . . . . . . . . . . . . . .1-1

[2] SPECIFICATIONS . . . . . . . . . . . . . . . . . . .2-1

[3] EXTERNAL VIEW AND INTERNAL

STRUCTURE

1. Identification of each section and

functions . . . . . . . . . . . . . . . . . . . . . . . .3-1

[4] OPERATIONAL DESCRIPTIONS

1. Document size detection . . . . . . . . . . .4-1

2. Timing chart . . . . . . . . . . . . . . . . . . . . .4-1

[5] DISASSEMBLY AND ASSEMBLY

1. Exterior section. . . . . . . . . . . . . . . . . . .5-1

2. Paper feed section . . . . . . . . . . . . . . . .5-2

3. Upper transport section . . . . . . . . . . . .5-6

4. Lower transport section . . . . . . . . . . . .5-8

5. Optical section . . . . . . . . . . . . . . . . . .5-12

6. Paper exit section . . . . . . . . . . . . . . . .5-16

7. Drive section. . . . . . . . . . . . . . . . . . . .5-17

8. Others . . . . . . . . . . . . . . . . . . . . . . . . .5-19

[6] MAINTENANCE

1. Maintenance system table . . . . . . . . . .6-1

[7] ADJUSTMENTS

1. Levelness adjustment . . . . . . . . . . . . . .7-1

2. Skew adjustment

(front surface mode) . . . . . . . . . . . . . . .7-1

3. Skew adjustment

(back surface mode) . . . . . . . . . . . . . . .7-2

4. Image focus adjustment

(front surface mode) . . . . . . . . . . . . . . .7-3

MODEL

5. Image focus adjustment

(back surface mode) . . . . . . . . . . . . . . 7-3

6. Image magnification in the main scanning direction adjustment

(front surface mode) . . . . . . . . . . . . . . 7-4

7. Image magnification in the main scanning direction adjustment

(back surface mode) . . . . . . . . . . . . . . 7-4

8. Image magnification in the sub

scanning direction adjustment . . . . . . . 7-4

9. Scanned image off-center

adjustment (front surface mode) . . . . . 7-5

10. Scanned image off-center

adjustment (back surface mode) . . . . . 7-5

11. Original scan position adjustment . . . . 7-6

12. Copied image loss/void area

adjustment . . . . . . . . . . . . . . . . . . . . . . 7-6

13. Paper width sensor for the paper

feed tray adjustment . . . . . . . . . . . . . . 7-7

14. Auto void adjustment

(Service installation adjustment) . . . . . 7-8

15. Shading adjustment. . . . . . . . . . . . . . . 7-9

16. CCD gamma adjustment

(CCD calibration) . . . . . . . . . . . . . . . . 7-10

[8] SELF DIAG AND TROUBLE CODE

1. Trouble code and troubleshooting . . . . 8-1

[9] ELECTRICAL SECTION

1. Electrical and mechanism relation

diagram . . . . . . . . . . . . . . . . . . . . . . . . 9-1

2. Block diagram . . . . . . . . . . . . . . . . . . . 9-4

3. Actual wiring chart . . . . . . . . . . . . . . . . 9-5

MX-4501N

Parts marked with " " are important for maintaining the safety of the set. Be sure to replace these parts with specified ones for maintaining the safety and performance of the set.

This document has been published to be used

SHARP CORPORATION

for after sales service only. The contents are subject to change without notice.

MX3501N

[1] PRODUCT OUTLINE

This model is the document feed unit which allows scanning duplex document surfaces at the same time. It is installed to the digital copier machine. It scans duplex document surfaces at the same time and transport it automatically to make continuous copying.

Service Manual

Staple cartridge (Approx. 5000 x 3) (MX-SCX1)

Punch module

●

2-hole (MX-PNX1A)

●

3-hole (MX-PNX1B)

●

4-hole (MX-PNX1C)

●

4-hole (broad space)

Staple cartridge (Approx. 5000 x 3) (AR-SC2)

Punch module

●

2-hole (AR-PN1A)

●

3-hole (AR-PN1B)

●

4-hole (AR-PN1C)

●

4-hole (broad space)

(AR-PN1D)

(MX-PNX1D)

Finisher (MX-FNX1)

Paper pass unit (MX-RBX1)

Saddle stitch finisher (MX-FNX2)

Stand/1x500 sheet paper drawer (MX-DEX3)

DSPF

HDD

Copier/Printer /Scanner model

(MX-3501N) (MX-4501N)

Stand/2x500 sheet paper drawer (MX-DEX4)

Exit tray unit (MX-TRX2)

Large capacity tray (MX-LCX1)

MX3501N PRODUCT OUTLINE 1 – 1

MX3501N

[2] SPECIFICATIONS

Form DSPF (Duplex single pass feeder) Scan speed Monochrome (A4/8.5 x 11) Color (A4/8.5 x 11)

Copy 1-sided: 45 sheets/minute (600 x 300dpi, 1bit)

Fax 1-sided: 60 sheets/minute (200 x 200dpi, 1bit)

Scanner 1-sided: 60 sheets/minute (200 x 200dpi, 1bit)

Internet Fax 1-sided: 60 sheets/minute (200 x 200 dpi, 1bit)

Document standard location

Document sizes Inch type-1: 11 x 17, 8.5 x 14, 8.5 x 11, 8.5 x 11R, 8.5 x 5.5, A4, A3

Document weights 1-side:

Document carrying capacity Types of document that may not be transported

Paper detection Yes Paper detection size Auto detection (Switching one type of detection unit through system setting)

Paper feeding direction Right hand feeding Document inversion No Simultaneous doublesided scanning

2-sided: 60 pages/minute (600 x 300dpi, 1bit)

2-sided: 60 pages/minute (200 x 200dpi, 1bit)

2-sided: 60 pages/minute (200 x 200 dpi, 1bit) Center standard (Rear one-side standard for random feeding)

Inch type-2: 11 x 17, 8.5 x 13, 8.5 x 11, 8.5 x 11R, 8.5 x 5.5, A4, A3 AB type-1: A3, B4, A4, A4R, B5, B5R, A5, 8.5 x 11, 8.5 x 14, 11 x 17 AB type-2: A3, B4, A4, A4R, B5, B5R, A5, 8.5 x 11, 216 x 330, 11 x 17 AB type-3: 8K, A4, A4R, B4, 16K, 16KR, A5, 8.5 x 11, 216 x 330, 11 x 17 Long paper: 800mm (Monochrome 2 levels only) Mixed feeding (same type / same width) possible Random feeding (feeding of different types / different widths) Only the following combinations of 2 size types are allowed: A3 and B4; B4 and A4R; A4 and B5; B5 and A5; and 11-inch and 8.5-inch.

Thin paper: 35 – 49g/m Plain paper: 50 – 128g/m

2-side: 50 – 105 g/m Maximum: 150 sheets (80g/m

The following documents are NOT allowed: OHP, second original drawing, tracing paper, carbon paper, thermal paper, wrinkled / broken / torn document, document with cuts and pastes, documents printed by an ink ribbon, and perforated document except 2-punched / 3-punched (Perforated document by punch unit is allowed.)

Inch-1: 11 x 17, 8.5 x 14, 8.5 x 11, 8.5 x 11R, 5.5 x 8.5, A4, A3 Inch-2: 11 x 17, 8.5 x 13, 8.5 x 11, 8.5 x 11R, 5.5 x 8.5, A4, A3 AB-1: A3, B4, A4, A4R, B5, B5R, A5, 8.5 x 11, 8.5 x 14, 216 x 330, 11 x 17 AB-2: A3, B4, A4, A4R, B5, B5R, A5, 8.5 x 11, 216 x 330, 11 x 17 AB-3: 8K, B4, A4, A4R, 16K, 16KR, A5, 8.5 x 11, 216 x 330, A3

Allowed

(9 – 13 lbs)

(13 – 34 lbs)

(13 – 28 lbs)

, 21lbs), or Maximum: 19.5 mm, 3/4 inch or less

Service Manual

1-sided: 35 sheets/minute (600 x 600dpi, 4bit) 2-sided: 35 pages/minute (600 x 600dpi, 4bit) N/A

1-sided: 35 sheets/minute (200 x 200dpi, 8bit) 2-sided: 35 pages/minute (200 x 200dpi, 8bit) N/A

MX3501N SPECIFICATIONS 2 – 1

MX3501N

[3] EXTERNAL VIEW AND INTERNAL STRUCTURE

Service Manual

1. Identification of each section and functions

A. Internal structure

No. Name Function/ Operation

1 Pickup roller Picks up a document and feeds it to the paper feed roller. 2 Paper feed roller Performs the paper feed operation of documents. 3 Separation roller Separate a document to prevent against double-feed. 4 No. 1 resist roller (Drive) Performs resist of document transport. 5 No. 1 resist roller (Idle) Applied a pressure to paper and the resist roller, and provides transport power of the resist roller to paper. 6 Transport roller 1 (Drive) Transports paper from No. 1 resist roller to No. 2 resist roller. 7 Transport roller 1 (Idle) Applied a pressure to paper and the transport roller, and provides the transport power of the transport roller to paper. 8 No. 2 resist roller (Drive) Make synchronization between the lead edge of a document and the scan start position.

9 No. 2 resist roller (Idle) Applies a pressure to paper and the resist roller, and provides transport power of the resist roller to paper. 10 Platen roller Applies a pressure to paper to prevent against fluctuations on operation of paper. 11 Transport roller 2 (Drive) Transports paper from the platen roller to the transport roller 3. 12 Transport roller 2 (Idle) Applies a pressure to paper and the transport roller and provides transport power of the transport roller to paper. 13 Transport roller 3 (Drive) Transports paper from the transport roller 2 to the paper exit roller. 14 Transport roller 3 (Idle) Applies a pressure to paper and the transport roller and provides transport power of the transport roller to paper. 15 Paper exit roller (Drive) Discharges paper. 16 Paper exit roller (Idle) Applies a pressure to paper and the paper exit roller and provides transport power of the paper exit roller to paper.

10 12 14 168 11 13 15

1257 46

MX3501N EXTERNAL VIEW AND INTERNAL STRUCTURE 3 – 1

B. Sensors, switches

3 7 8 91

54 6

7 8

11 12

13 15

1410 16 17

1 3

2 6

16 17

Signal

No.

name

1 SPPD2 DSPF paper pass sensor 2 Transmission type Detects pass of the paper. L when paper is detected.

2 SPPD1 DSPF paper pass sensor 1 Transmission type Detects pass of the paper. L when paper is detected.

3 SCOV DSPF upper door open/close sensor Transmission type Detects open/close of the upper door. L when the upper door is open.

4 SPRDMD DSPF document random sensor Transmission type Detects the paper size in random paper feed. L when paper is detected.

5 STUD DSPF paper feed tray upper limit

6 SPED1 DSPF document upper limit sensor Transmission type Detects the upper limit of the DSPF document. L when paper is detected.

7 SPWS DSPF document width sensor Volume resistor Detects the document width of the paper feed

8 SPLS1 DSPF document length detection

9 SPLS2 DSPF document length detection

10 SPPD3 DSPF paper pass sensor 3 Transmission type Detects pass of the paper. L when paper is detected. 11 SPPD4 DSPF paper pass sensor 4 Transmission type Detects pass of the paper. L when paper is detected. 12 SOCD DSPF open/close sensor Transmission type Detects open/close of the DSPF unit. L when the DSPF unit is open. 13 SLCOV DSPF lower door open/close sensor Micro switch Detects open/close of the lower door. L when the lower door is open. 14 SPPD5 DSPF paper pass sensor 5 Transmission type Detects pass of the paper. L when paper is detected. 15 SPOD DSPF paper exit sensor Transmission type Detects paper exit of the document. L when paper is detected. 16 SPED2 DSPF document empty sensor Transmission type Detects document empty in the paper feed

17 STLD DSPF paper feed tray lower limit

sensor

short sensor

long sensor

sensor

Name Type Function/Operation Active condition

Transmission type Detects the upper limit of the paper feed tray. L when the upper limit of the

tray upper.

Transmission type Detects the document length of the paper feed

tray upper.

Transmission type Detects the document length of the paper feed

tray upper.

tray.

Transmission type Detects the lower limit of the paper feed tray. H when the lower limit of the

MX3501N EXTERNAL VIEW AND INTERNAL STRUCTURE 3 – 2

paper feed tray is detected.

—

H when paper is detected.

L when paper is detected.

paper feed tray is detected.

C. Motors, clutches, solenoids, PWB and lamps

2 6 7

5 1 3 4

13 12

No. Signal name Name Type Function/Operation

1 SPUM DSPF paper feed motor Hybrid step motor Drives the rollers, transport rollers and transport rollers in the

2 SPFM DSPF transport motor Hybrid step motor Drives the transport roller.

3 SPOM DSPF paper exit motor PM step motor Drives the paper exit roller.

4 SLUM DSPF lift-up motor PM step motor Lifts up or moves down the paper feed tray.

5 SPFC DSPF paper feed clutch Electromagnetic clutch Controls ON/OFF of the rollers in the paper feed section.

6 STRRC DSPF No.1 resist roller clutch Electromagnetic clutch Controls ON/OFF of No. 1 resist roller.

7 STRRBC DSPF No.1 resist roller brake clutch Electromagnetic clutch Performs braking of No. 1 resist roller.

8 STRC DSPF transport roller clutch Electromagnetic clutch Controls ON/OFF of the transport roller 1.

9 SRRC DSPF No.2 resist roller clutch Electromagnetic clutch Controls ON/OFF of No. 2 resist roller. 10 SRRBC DSPF No.2 resist roller brake clutch Electromagnetic clutch Performs braking of No. 2 resist roller. 11 SPFFAN DSPF cooling fan motor DC brush-less motor Cools the motors and the clutches. 12 — DSPF control PWB — Control PWB for DSPF 13 — DSPF flash PWB — Program ROM PWB for DSPF 14 — DSPF driver PWB — Driver PWB for DSPF 15 — DSPF CCD PWB — Scans document images. 16 — DSPF CL inverter PWB — Drives the copy lamp. 17 DSPF COPY LUMP DSPF copy lamp Xenon lamp Radiates light onto a document to allow the CCD to scan

paper feed section.

document images.

MX3501N EXTERNAL VIEW AND INTERNAL STRUCTURE 3 – 3

SPWS

SPLS1

SPLS2

MX3501N

[4] OPERATIONAL DESCRIPTIONS

Service Manual

1. Document size detection

Size detection on the document tray

The document size is detected by the DSPF document width sensor (SPWS), and the document length is detected by the DSPF document length sensors (SPLS1, SPLS2). The document size is judged from the document width and the document length as shown in the table below.

When, however, documents of different sizes are mixed and set on the document tray, the largest size is detected.

Document size

Document length sensor

SPLS1 SPLS2

AB series A5 OFF OFF

B5 OFF OFF

11" x 8.5" OFF OFF

A4 OFF OFF B5R ON OFF A4R ON OFF

8.5" x 13" ON ON B4 ON ON A3 ON ON

11" x 17" ON ON

Inch series 8.5" x 5.5" OFF OFF

11" x 8.5" OFF OFF

A4 OFF OFF

11" x 8.5"R ON OFF

8.5" x 13" ON ON

8.5" x 14" ON ON A3 ON ON

11" x 17" ON ON

2. Timing chart

To increase the document replacement speed, pre-feed of the second and the later documents is performed for documents of A4/Letter or smaller sizes. Therefore, a clutch is provided for each transport roller to perform individual control.

An electromagnetic brake is provided for each transport roller in order to reduce loads to the motor in comparison with a mechanical brake.

Transport speed 314mm/s Letter single-surface transport

SPFFAN DSPF cooling fan motor

SPUM DSPF paper feed motor

SPFM DSPF transport motor

SPFC DSPF paper feed clutch

STRRC DSPF No.1 resist roller clutch

STRRBC DSPF No.1 resist roller brake clutch

SPRDMD DSPF random sensor 1

SPPD1 DSPF paper pass sensor 1

SPPD2 DSPF paper pass sensor 2

STRC DSPF transport roller clutch

SPPD3 DSPF paper pass sensor 3

SRRC DSPF No.2 resist roller clutch

SRRBC DSPF No.2 resist roller brake clutch

SPPD4 DSPF paper pass sensor 4

SPPD5 DSPF paper pass sensor 5

OC scanner scanning

Built-in scanner scanning

SPOD DSPF paper exit sensor

SPOM DSPF paper exit motor

Copy key ON

Timer from ON

12.3mm

37.6mm

11.8mm

39.3mm

ON simultaneously with print start of each motor OFF at 500ms after SPCD OFF of the last paper

ON simultaneously with SPPD2_ON OFF at 69.4ms after SPPD2_OFF

ON at 12.3mm - 10ms (29ms) after SPPD3 ON (SIM adjustment) OFF at 11.8mm (38ms) after SPPD3 OFF

ON simultaneously with SPPD3 ON OFF at 10ms before SRRC ON

Scanning start at 37.6mm (120ms) from SPPD4 ON (SIM adjustment)

Scanning start at 39.3mm (125ms) from SPPD5 ON (SIM adjustment)

Reduces the speed simultaneously with SPOD OFF, reduces the speed up to 1855PPS in 15.7mm Drives for 15mm and returns to 3709PPS in 15.7mm.

(Common to each paper size)

MX3501N OPERATIONAL DESCRIPTIONS 4 – 1

MX3501N

[5] DISASSEMBLY AND

ASSEMBLY

1. Exterior section

A. DSPF unit

1) Remove the upper cabinet rear cover lid. Remove the screw, and remove the upper cabinet rear cover.

4) Open the DSPF unit to put it straight up, and remove the

Service Manual

screw.

2) Remove the screw, and remove the earth line. Disconnect the connector, and remove the snap band. Remove the screw, and remove the locking band and the interface harness cover.

3) Loosen the screw, and lower the angle adjustment plate.

5) Slide the DSPF unit to the rear side, and fit the step screw with the key hole of the hinge, and lift it up to remove.

MX3501N DISASSEMBLY AND ASSEMBLY 5 – 1

(1) Front cabinet

1) Open the upper door, and remove the screw.

2) Remove the pawl, and remove the front cabinet.

(4) Upper door

1) Remove the front cabinet. (Refer to "1. Exterior section - A. DSPF unit - (1) Front cabinet.")

2) Remove the spring. Remove the pawl. Remove the pressure

release axis holder. Remove the screw. Remove the pressure release link lever.

(2) Rear cabinet

1) Open the upper door. Remove the screw. Remove the pawl. Remove the rear cabinet.

3) Remove the resin E-ring, and remove the upper door.

(3) Paper feed cover

1) Open the upper door. Remove the screw. Remove the paper feed cover.

2. Paper feed section

A. Paper feed tray unit

1) Remove the front cabinet. (Refer to "1. Exterior section - A. DSPF unit - (1) Front cabinet.")

2) Remove the rear cabinet. (Refer to "1. Exterior section - A. DSPF unit - (2) Rear cabinet.")

3) Disconnect the connector. Remove the screw, and remove the paper feed tray unit.

MX3501N DISASSEMBLY AND ASSEMBLY 5 – 2

(1) DSPF document length detection short sensor

(2) DSPF document length detection long sensor

1) Remove the front cabinet. (Refer to "1. Exterior section - A. DSPF unit - (1) Front cabinet.")

2) Remove the rear cabinet. (Refer to "1. Exterior section - A. DSPF unit - (2) Rear cabinet.")

3) Remove the paper feed tray unit. (Refer to "2. Paper feed section - A. Paper feed tray unit.")

4) Remove the screw, and remove the paper feed tray lower.

5) Disconnect the connector, and remove the DSPF document length detection short sensor (a) and the DSPF document length detection long sensor (b).

5) Remove the screw, and remove the rotation tray shaft. Remove the paper feed rotation tray.

6) Disconnect the connector. Remove the pawl, and remove the DSPF document width sensor.

(3) DSPF document width sensor

1) Remove the front cabinet. (Refer to "1. Exterior section - A. DSPF unit - (1) Front cabinet.")

2) Remove the rear cabinet. (Refer to "1. Exterior section - A. DSPF unit - (2) Rear cabinet.")

3) Remove the paper feed tray unit. (Refer to "2. Paper feed section - A. Paper feed tray unit.")

4) Remove the screw, and remove the paper feed tray lower. Disconnect the connector.

B. Paper feed unit

1) Remove the front cabinet. (Refer to "1. Exterior section - A. DSPF unit - (1) Front cabinet.")

2) Remove the rear cabinet. (Refer to "1. Exterior section - A. DSPF unit - (2) Rear cabinet.")

3) Remove the paper feed cover. (Refer to "1. Exterior section A. DSPF unit - (3) Paper feed cover.")

4) Disconnect the connector. Open the wire saddle. Remove the snap band.

MX3501N DISASSEMBLY AND ASSEMBLY 5 – 3

5) Remove the screw, and remove the paper feed unit.

5) Remove the screw, and remove the paper feed PG lower cover.

(1) Pickup roller

(2) Paper feed roller

(3) Separation roller

1) Remove the paper feed cover. (Refer to "1. Exterior section A. DSPF unit - (3) Paper feed cover.")

2) Remove the pawl, and remove the paper feed PG upper cover.

3) Remove the pawl. Remove the pickup roller holder. Remove the pickup roller from the pickup roller holder.

6) Disengage the pawl, and remove the reverse pressure release lever. Remove the separation roller.

(4) DSPF paper feed tray upper limit sensor

(5) DSPF document upper limit sensor

(6) DSPF upper door open/close sensor

(7) DSPF paper pass sensor 1

(8) DSPF document random sensor

1) Remove the front cabinet. (Refer to "1. Exterior section - A. DSPF unit - (1) Front cabinet.")

2) Remove the rear cabinet. (Refer to "1. Exterior section - A. DSPF unit - (2) Rear cabinet.")

3) Remove the paper feed cover. (Refer to "1. Exterior section A. DSPF unit - (3) Paper feed cover.")

4) Remove the paper feed unit. (Refer to "2. Paper feed section B. Paper feed unit.")

5) Disconnect the connector. Remove the screw, and remove the paper feed PG upper supporting plate.

4) Remove the paper feed roller.

MX3501N DISASSEMBLY AND ASSEMBLY 5 – 4

6) Disconnect the connector, and remove the DSPF paper feed tray upper limit sensor (a), the DSPF document upper limit sensor (b), the DSPF upper door open/close sensor (c), the DSPF paper pass sensor 1 (d), and the DSPF document random sensor (e).

7) Remove the E-ring and the bearing. Lift the paper feed roller shaft diagonally, and remove the DSPF paper feed clutch.

* When assembling, check to insure that the clutch rotation stop-

per is engaged with the plate.

(9) DSPF paper feed clutch

1) Remove the front cabinet. (Refer to "1. Exterior section - A. DSPF unit - (1) Front cabinet.")

2) Remove the rear cabinet. (Refer to "1. Exterior section - A. DSPF unit - (2) Rear cabinet.")

3) Remove the paper feed cover. (Refer to "1. Exterior section A. DSPF unit - (3) Paper feed cover.")

4) Remove the paper feed unit. (Refer to "2. Paper feed section B. Paper feed unit.")

5) Remove the pawl, and remove the paper feed PG upper cover.

C. Others

(1) Torque limiter

1) Remove the front cabinet. (Refer to "1. Exterior section - A. DSPF unit - (1) Front cabinet.")

2) Remove the rear cabinet. (Refer to "1. Exterior section - A. DSPF unit - (2) Rear cabinet.")

3) Remove the paper feed unit. (Refer to "2. Paper feed section B. Paper feed unit.")

4) Remove the DSPF No.1 resist roller brake clutch and remove the DSPF No.1 resist roller clutch. (Refer to "3. Upper transport section - A. DSPF No.1 resist roller brake clutch, B. DSPF No.1 resist roller clutch.")

5) Remove the drive unit. (Refer to "7. Drive section - A. Drive unit.")

6) Remove the resin E-ring, and remove the No.1 resist roller (idle).

6) Disconnect the connector. Remove the screw, and remove the paper feed PG upper supporting plate.

7) Remove the screw. Lift the paper feed rotation tray, and remove the paper feed PG lower.

MX3501N DISASSEMBLY AND ASSEMBLY 5 – 5

8) Remove the screw, and remove the separation roller supporting plate and the bearing. Remove the roller shaft, and remove the torque limiter.

(2) DSPF paper feed tray lower limit sensor

(3) DSPF document empty sensor

1) Remove the front cabinet. (Refer to "1. Exterior section - A. DSPF unit - (1) Front cabinet.")

2) Remove the rear cabinet. (Refer to "1. Exterior section - A. DSPF unit - (2) Rear cabinet.")

3) Remove the paper feed tray unit. (Refer to "2. Paper feed section - A. Paper feed tray unit.")

4) Disconnect the connector, and remove the DSPF paper feed tray lower limit sensor (a) and the DSPF document empty sensor (b).

3. Upper transport section

A. DSPF No.1 resist roller brake clutch

B. DSPF No.1 resist roller clutch

1) Remove the rear cabinet. (Refer to "1. Exterior section - A. DSPF unit - (2) Rear cabinet.")

2) Disconnect the connector. Remove the resin E-ring. Remove the DSPF No.1 resist roller brake clutch (a) and the DSPF No.1 resist roller clutch (b).

* When assembling, check to insure that the clutch rotation stop-

per is engaged with the plate.

C. DSPF transport roller clutch

1) Remove the rear cabinet. (Refer to "1. Exterior section - A. DSPF unit - (2) Rear cabinet.")

2) Disconnect the connector, and remove the snap band. Remove the resin E-ring, and remove the DSPF transport roller clutch.

* When assembling, check to insure that the clutch rotation stop-

per is engaged with the plate.

MX3501N DISASSEMBLY AND ASSEMBLY 5 – 6

D. No.1 resist roller (Drive)

1) Remove the front cabinet. (Refer to "1. Exterior section - A. DSPF unit - (1) Front cabinet.")

2) Remove the rear cabinet. (Refer to "1. Exterior section - A. DSPF unit - (2) Rear cabinet.")

3) Remove the paper feed unit. (Refer to "2. Paper feed section B. Paper feed unit.")

5) Remove the resin E-ring, and remove the No.1 resist roller (idle).

8) Remove the E-ring and the bearing from the No.1 resist roller (drive).

E. DSPF paper pass sensor 2

F. Transport roller 1 (drive)

1) Remove the front cabinet. (Refer to "1. Exterior section - A. DSPF unit - (1) Front cabinet.")

2) Remove the rear cabinet. (Refer to "1. Exterior section - A. DSPF unit - (2) Rear cabinet.")

3) Remove the screw, and remove the transport PG upper.

6) Remove the screw, lift the paper feed rotation tray, and remove the paper feed PG lower.

7) Remove the resin E-ring and the bearing, and remove the No.1 resist roller (drive).

4) Disconnect the connector, and remove the DSPF paper pass sensor 2.

MX3501N DISASSEMBLY AND ASSEMBLY 5 – 7

5) Remove the DSPF transport roller clutch. (Refer to "3. Upper transport section - C. DSPF transport roller clutch.")

6) Remove the E-ring, the washer, the spring, the collar, the polyslider, and the bearing. Remove the belt, the pulley, and the bearing, and remove the transport roller 1 (drive).

C. DSPF No.2 resist roller brake clutch

D. DSPF No.2 resist roller clutch

1) Remove the rear cabinet. (Refer to "1. Exterior section - A. DSPF unit - (2) Rear cabinet.")

2) Disconnect the connector. Remove the resin E-ring and remove the DSPF No.2 resist roller brake clutch (a) and the DSPF No.2 resist roller clutch (b).

* When assembling, check to insure that the clutch rotation stop-

per is engaged with the plate.

7) Remove the E-ring and the bearing from the transport roller 1 (drive).

4. Lower transport section

A. Platen roller

B. No.1 scanning plate

1) Open the DSPF unit, and clean the platen roller and the No.1 scanning plate.

E. DSPF paper pass sensor 3

F. DSPF paper pass sensor 4

G. No.2 resist roller (Drive)

1) Remove the front cabinet. (Refer to "1. Exterior section - A. DSPF unit - (1) Front cabinet.")

2) Remove the rear cabinet. (Refer to "1. Exterior section - A. DSPF unit - (2) Rear cabinet.")

3) Remove the upper door. (Refer to "1. Exterior section - A. DSPF unit - (3) Upper door.")

4) Remove the screw, and remove the transport PG upper.

MX3501N DISASSEMBLY AND ASSEMBLY 5 – 8

5) Loosen the screw, and lower the angle adjustment plate. Open the DSPF unit.

10) Remove the screw and the connector, and remove the DSPF paper pass sensor 3.

6) Remove the screw, and remove the left rear lower cabinet.

7) Remove the resin E-ring, and remove the PS knob.

11) Remove the screw, and remove the lift-up PG.

12) Remove the screw, and remove the spring. Remove the belt, the pawl, and the platen roller.

8) Remove the screw, and remove the PS outer PG.

9) Remove the screw, and remove the PS front PG.

13) Disconnect the connector and remove the screw. Remove the DSPF paper pass sensor 4.

MX3501N DISASSEMBLY AND ASSEMBLY 5 – 9

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