Mita-Kyocera STDF-3 Service Manual

STDF-3

CONTENTS

1-1 Specifications

1-1-1 Specifications ....................................................................................................................................... 1-1-1

1-1-2 Part names and their functions ............................................................................................................ 1-1-2

1-1-3 Machine cross section .......................................................................................................................... 1-1-3

1-1-4 Drive system ........................................................................................................................................ 1-1-4

1-2 Installation

1-2-1 Unpacking ............................................................................................................................................ 1-2-1

1-3 Troubleshooting

1-3-1 Original misfeed detection .................................................................................................................... 1-3-1

(1) Original misfeed indication ............................................................................................................ 1-3-1

(2) Original misfeed detection condition ............................................................................................. 1-3-2

(3) Original misfeeds .......................................................................................................................... 1-3-3

(1) An original jams when the main switch is turned on. ............................................................. 1-3-3

(2) An original jams during continuous copying of multiple originals. ......................................... 1-3-3

(3) An original jams in the DF during copying (no original feed). ................................................ 1-3-3

(4) An original jams in the DF during copying (an original jam in the original feed

and conveying sections). ....................................................................................................... 1-3-3

(5) Original jams frequently. ........................................................................................................ 1-3-3

1-3-2 Image formation problems ................................................................................................................... 1-3-4

(1) There is a regular error between the centers of the original and copy image

when the DF is used. .................................................................................................................... 1-3-5

(2) There is a regular error between the leading edges of the original and copy image

when the DF is used. .................................................................................................................... 1-3-5

1-3-3 Electrical problems ............................................................................................................................... 1-3-6

(1) The original feed motor does not operate. .................................................................................... 1-3-6

(2) The original conveying motor does not operate. ........................................................................... 1-3-6

(3) The copier scans the contact glass when originals are loaded on the DF. ................................... 1-3-6

(4) An original jams when the main switch is turned on. .................................................................... 1-3-6

1-3-4 Mechanical problems ........................................................................................................................... 1-3-7

(1) No primary original feed. ............................................................................................................... 1-3-7

(2) No secondary original feed. .......................................................................................................... 1-3-7

(3) Originals jam. ................................................................................................................................ 1-3-7

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1-4 Assembly and Disassembly

1-4-1 Precautions for assembly and disassembly ......................................................................................... 1-4-1

(1) Precautions ................................................................................................................................... 1-4-1

1-4-2 Procedure for assembly and disassembly ........................................................................................... 1-4-2

(1) Detaching and refitting the DF forwarding pulley and DF original feed pulley .............................. 1-4-2

(2) Detaching and refitting the DF separation pulley .......................................................................... 1-4-3

(3) Adjusting the lateral squareness of the DF ................................................................................... 1-4-4

(4) Adjusting the DF magnification ..................................................................................................... 1-4-5

(5) Adjusting the DF center line .......................................................................................................... 1-4-7

(6) Adjusting the scanning start position when the DF is used ........................................................... 1-4-9

(6-1) Adjusting the DF leading edge registration .......................................................................... 1-4-9

(6-2) Adjusting the DF trailing edge registration ......................................................................... 1-4-11

(7) Adjusting the margins for scanning the original from the DF ...................................................... 1-4-13

2-1 Mechanical construction

2-1-1 Mechanical construction ....................................................................................................................... 2-1-1

(1) Original feed mechanism .............................................................................................................. 2-1-1

(2) Original feed timing ....................................................................................................................... 2-1-3

1-1-1

2-2 Electrical Parts Layout

2-2-2 Electrical parts layout ........................................................................................................................... 2-2-1

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2-3 Operation of the PCBs

2-3-1 DF driver PCB ...................................................................................................................................... 2-3-1

2-3-2 Original size detection PCB ................................................................................................................. 2-3-4

2-4 Appendixes

Timing chart No. 1 .......................................................................................................................................... 2-4-1

Timing chart No. 2 .......................................................................................................................................... 2-4-2

Periodic maintenance procedures .................................................................................................................. 2-4-3

Wiring diagram ............................................................................................................................................... 2-4-4

1-1-2

1-1-1 Specifications

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Original feed system ...................... Automatic feed

Originals ......................................... Sheets

Original weights.............................. 35 – 160 g/m

Original sizes .................................. A3 – A5R, folio/11" × 17" – 51/2" × 81/2"

Number of originals ........................ Up to 70 sheets (A4 or smaller paper of 80 g/m

75 g/m

)

Up to 50 sheets (B4, folio or larger paper of 80 g/m

75 g/m

) Up to 30 sheets in the auto selection mode Thermal and art paper must be fed individually.

Power source ................................. Electrically connected to the copier

Machine dimensions ...................... 553 (W) × 478 (D) × 121 (H) mm

/4" (W) × 1813/16" (D) × 43/4" (H)

Weight ............................................Approx. 6.9 kg/15.18 lbs

, or 11" × 81/2" or smaller paper of

, or 81/2" × 14" or larger paper of

1-1

1-1-1

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1-1-2 Part names and their functions

1-1

Figure 1-1-1

1 Original table 2 Original insertion guides 3 DF open/close handle 4 Original eject cover 5 DF original cover

1-1-2

1-1-3 Machine cross section

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1-1

Original path

Figure 1-1-2 Machine cross section

1-1-3

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1-1-4 Drive system

1-1

1 Original feed motor gear 2 Gear 42/29 3 Lift gear 38 4 Idle gear 20 5 Original feed gear 30 6 Original feed pulley 7 Forwarding belt 8 Forwarding pulley 20 9 Original conveying motor gear

Figure 1-1-3

0 Idle gear Z45/B16 ! Original conveying belt 92 @ Tension pulley # Registration pulley 19 $ Original conveying pulley 24 % Original conveying belt 190 ^ Tension pulley & Original conveying pulley 24

1-1-4

1-2-1 Unpacking

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1-2

Figure 1-2-1 Unpacking

1 Sheet through DF 2 Installation manual 3 Plastic bag 4 Bottom pads 5 Upper pad 6 Outer case 7 Plastic sheet 8 Bar-code labels 9 Plastic bag

1-2-1

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1-3-1 Original misfeed detection

(1) Original misfeed indication

When an original jams, the machine immediately stops operation and the occurrence of an original jam is indicated on the copier operation panel. To remove the jammed original, open the DF or the DF original cover. To reset the original misfeed detection, open and close the DF or the DF original cover to turn DF safety switch 1 or 2 off and on.

DFTSW

Figure 1-3-1 Original misfeed detection

1-3

1-3-1

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(2) Original misfeed detection condition

• No original feed (jam code 70) During the primary feed of the second or later original, the DF timing switch (DFTSW) does not turn on within 1410 original feed motor (OFM) pulses of the start of forward rotation of the original feed motor (OFM). After up to five retries, the DF timing switch (DFTSW) still fails to turn on.

1-3

OFM

DFTSW

1410 P*

* Burst of OFM pulses

Off

On (Fwd.)

Off

Timing chart 1-3-1

• An original jam in the original feed and conveying sections (jam code 73) During the secondary original feed, the DF timing switch (DFTSW) does not turn off within 10200 original conveying motor (OCM) pulses of the DF timing switch (DFTSW) turning on.

DFTSW

10200 P*

* Burst of OCM pulses

Off

Timing chart 1-3-2

During the secondary original feed, the DF timing switch (DFTSW) turns off within 1764 original conveying motor (OCM) pulses of the DF timing switch (DFTSW) turning on.

DFTSW

1764 P*

* Burst of OCM pulses

Off

Timing chart 1-3-3

1-3-2

(3) Original misfeeds

Problem Causes Check procedures/corrective measures

(1) An original jams when the main switch is turned on.

A piece of paper torn from an original is caught around the actuator of the original size detection PCB.

Defective original size detection PCB.

Remove any found.

With 5 V DC present at CN5-8 on the DF driver PCB, check if CN5-3 on the DF driver PCB remains low when the actuator on the machine front side of the original size detection PCB is turned on and off. If it does, replace the original size detection PCB.

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(2) An original jams during continuous copying of multiple originals.

(3) An original jams in the DF during copying (no original feed).

A piece of paper torn from an original is caught around the DF timing switch.

Defective DF timing switch.

Defective original size detection PCB.

Check if the original feed motor or original conveying motor is malfunctioning.

Defective DF timing switch.

Check if the original feed motor is malfunctioning.

Check if the DF forwarding pulley, DF original feed pulley or DF separation pulley is deformed.

Remove any found.

1-3

With 5 V DC present at CN5-8 on the DF driver PCB, check if CN5-1 on the DF driver PCB remains low when the DF timing switch is turned on and off. If it does, replace the DF timing switch.

Check and remedy.

With 5 V DC present at CN5-8 on the DF driver PCB, check if CN5-1 on the DF driver PCB remains high when the DF timing switch is turned on and off. If it does, replace the DF timing switch.

Check and remedy.

Check visually and replace the pulley if deformed (see pages 1-4-2 and 3).

(4) An original jams in the DF during copying (an original jam in the original feed and conveying sections).

(5) Original jams frequently.

Defective DF timing switch.

Check if the DF forwarding pulley, DF original feed pulley or DF separation pulley is deformed.

Check if the upper or lower DF registration roller is deformed.

An original outside the specifications is used.

The DF forwarding pulley, DF original feed pulley or DF separation pulley is soiled with paper powder.

The DF original feed pulley and DF separation pulley do not contact correctly.

With 5 V DC present at CN5-8 on the DF driver PCB, check if CN5-1 on the DF driver PCB remains high or low when the DF timing switch is turned on and off. If it does, replace the DF timing switch.

Check visually and replace the pulley if deformed (see pages 1-4-2 and 3).

Check visually and replace the roller if deformed.

Use only originals conforming to the specifications.

Clean with isopropyl alcohol.

Remedy.

1-3-3

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1-3-2 Image formation problems

1-3

(1) There is a regular error

between the centers of the original and copy image when the DF is used.

See page 1-3-5.

(2) There is a regular error

between the leading edges of the original and copy image when the DF is used.

See page 1-3-5.

1-3-4

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(1) There is a regular error

between the centers of the original and copy image when the DF is used.

Causes

1. Misadjusted DF center line.

(2) There is a regular error

between the leading edges of the original and copy image when the DF is used.

Causes

1. Misadjusted DF center line.

Check procedures/corrective measures

Readjust the DF center line (see page 1-4-7).

Causes

1. Misadjusted DF original scanning start position.

1-3

Causes

1. Misadjusted DF original scanning start position.

Check procedures/corrective measures

Readjust the DF original scanning start position (see page 1-4-9).

1-3-5

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