Minolta DI450 User manual

FrameMaker Ver5.5E(PC) COVER [GENERAL] FOR Di450/Di550
00.08.25 FrameMaker Ver5.5E(PC) COVER [GENERAL] FOR Di450/Di550 00.08.25
Copyright
2000 MINOLTA Co., Ltd.
Printed in Japan
Use of this manual should
be strictly supervised to
avoid disclosure of
confidential information.
MINOLTA Co., Ltd. 4002-7990-11 00091200
11563
Di450/Di550
SERVICE MANUAL
[GENERAL]
Di450/Di550 SERVICE MANUAL [GENERAL]

FrameMaker Ver5.5E(PC) Di450/Di550
00.08.25
INDEX (GENERAL)
GENERAL
MECHANICAL/ELECTRICAL

FrameMaker Ver5.5E(PC) Di450/Di550 GENERAL
00.08.25
GENERAL
11563

FrameMaker Ver5.5E(PC) Di450/Di550 GENERAL
00.08.25
i
CONTENTS
1. SAFETY INFORMATION .................................................................................G-1
2. SPECIFICATION .............................................................................................G-6
3. PRECAUTIONS FOR INSTALLATION ............................................................G-9
3-1. Installation Site ........................................................................................G-9
3-2. Power Source ..........................................................................................G-9
3-3. Grounding ................................................................................................G-9
4. PRECAUTIONS FOR USE ..............................................................................G-10
4-1. To ensure that the copier is used in an optimum condition .....................G-10
4-2. Operating Environment ............................................................................G-10
4-3. Power Requirements ...............................................................................G-10
4-4. Note .........................................................................................................G-10
5. HANDLING OF CONSUMABLES ....................................................................G-11
6. OTHER PRECAUTIONS .................................................................................G-11
7. SYSTEM OPTIONS .........................................................................................G-12

FrameMaker Ver5.5E(PC) Di450/Di550 GENERAL
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G-1
1. SAFETY INFORMATION
Laser Safety
This is a digital machine which prints by means of a laser. There is no possibility of danger
from the laser, provided the machine is operated according to the instructions in this man-
ual.
Since radiation emitted by the laser is completely confined within protective housing, the
laser beam cannot escape from the machine during any phase of user operation.
This machine is certified as a Class 1 product. This means the machine does not produce
hazardous laser radiation.
Internal Laser Radiation
Maximum Average Radiation Power: 13.6 µW at laser aperture of the print head unit
Wavelength: 785 nm
This product employs a Class IIIb Laser Diode that emits an invisible laser beam.
The Laser Diode and Scanning Polygon Mirror are incorporated in the print head unit.
The print head unit is NOT A FIELD SERVICE ITEM.
Therefore, the print head unit should not be opened under any circumstances.
For United States
CDRH regulation
This copier is certified as a Class 1 Laser product under the Radiation Performance Stan-
dard according to the Food, Drug and Cosmetic Act of 1990. Compliance is mandatory for
Laser products marketed in the United States and is reported to the Center for Devices and
Radiological Health (CDRH) of the U.S. Food and Drug Administration of the U.S. Depart-
ment of Health and Human Services (DHHS). This means that the device does not produce
hazardous laser radiation.
CAUTION: The use of controls, adjustments or performance of procedures
other than those specified in this manual may result in hazardous radiation
exposure. Because of this, Minolta strongly recommends that you operate
your copy machine only as described in this documentation.

FrameMaker Ver5.5E(PC) Di450/Di550 GENERAL
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The label shown on page G-3 indicates compliance with the CDRH regulations and must
be attached to laser products marketed in the United States.
This is a semiconductor laser. The maximum power of the laser diode is 0.68 mW and the
wavelength is 785 nm.
For Europe
For Denmark
For Finland
For Sweden
CAUTION: Use of controls, adjustments or performance of procedures other than those
specified in this manual may result in hazardous radiation exposure.
CAUTION: Use of controls, adjustments or performance of procedures other than those
specified in this manual may result in hazardous radiation exposure.
This is a semiconductor laser. The maximum power of the laser diode is 0.68 mW and
the wavelength is 785 nm.
ADVARSEL
Usynlig laserstråling ved åbning, når sikkerhedsafbrydere er ude af funktion.
Undgå udsættelse for stråling. Klasse 1 laser produkt der opfylder IEC60825 sikkerheds
kravene.
Dansk: Dette er en halvlederlaser. Laserdiodens højeste styrke er 0.68mW og
bølgelængden er 785nm.
LUOKAN 1 LASERLAITE
VAROITUS
Laitteen käyttäminen muulla kuin tässä käyttöohjeessa mainitulla tavalla saattaa altistaa
käyttäjän turvallisuusluokan 1 ylittävälle näkymättömälle lasersäteilylle.
VARO
Avattaessa ja suojalukitus ohitettaessa olet alttiina näkymättomälle lasersäteilylle. Älä
katso säteeseen.
Tämä on puolijohdelaser. Laserdiodin suurin teho on 0.68mW ja aallonpituus on 785nm.
KLASS 1 LASER APPARAT
VARNING
Om apparaten används på annat sätt än i denna bruksanvisning specificerats, kan
användaren utsättas för osynlig laserstrålning, som överskrider gränsen för laserklass 1.

FrameMaker Ver5.5E(PC) Di450/Di550 GENERAL
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For Norway
Laser Safety Label
A laser safety label is attached to the outside of the copy machine as shown below.
The Manufacturer’s Name Plate is affixed at the position illustrated above.
Please write down the Model Name and Serial No. of your copier here.
VARNING
Osynlig laserstråining när denna del är öppnad och spärren är urkopplad. Betrakta ej
stråien.
Det här är en halvledarlaser. Den maximala effekten för laserdioden är 0.68mW och
våglängden är 785nm.
ADVERSEL
Dersom apparatet brukes på annen måte enn spesifisert i denne bruksanvisning, kan
brukeren utsettes för unsynlig laserstrålning, som overskrider grensen for laser klass 1.
Dette en halveder laser. Maksimal effekt till laserdiode er 0.68 mW og bφlgelengde er
785 nm.
Model:
Serial No.:
Laser safety label
Manufacturer’s
Name Plate
CLASS 1 LASER PRODUCT
LASER KLASSE 1 PRODUKT
MINOLTA CO., LTD
2, Higashiakatsuchi, Yawata-cho, Toyokawa-shi
Aichi-ken 442-8585, Japan
MANUFACTURED:
THIS PRODUCT COMPLIES WITH 21 CFR
CHAPTER I, SUBCHAPTER J.
0946-7101-14
For Europe
For United States
1166O248AA
1166O252BA
4002O110CB

FrameMaker Ver5.5E(PC) Di450/Di550 GENERAL
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Label inside copy machine
The following laser safety label will be attached inside the copy machine as shown below.
Please read the following for your own protection.
Opening the cover indicated by the Caution label may expose you to harmful laser radiation
which could cause damage or loss of eyesight. Do not open the cover when the power is
on.
Caution
Print Head
4002G510AA
1167P001AA

FrameMaker Ver5.5E(PC) Di450/Di550 GENERAL
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ALL Areas CAUTION
Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type recommended by the manufacturer.
Dispose of used batteries according to the manufacturer’s instructions.
Germany only VORSICHT!
Explosinsgefahr bei unsachgemäßen austausch der batterie.
Ersatz nur durch denselben oder einen vom hersteller empfohlenen ähnlichen typ.
Entsorgung gebrauchter batterien nach angaben des herstellers.
Denmark only ADVARSEL!
Lithiumbatteri - Eksplosionsfare ved fejlagtig håndtering Udskiftning måkun ske med bat-
teri af samme fabrikat og type.
Levér det brugte batteri tilbage til leverandøren.
Norway only ADVARSEL
Eksplosjonsfare ved feilaktig skifte av batteri.
Benytt samme batteritype eller en tilsvarende type anbefalt av apparatfabrikanten.
Brukte batterier kasseres i henhold til fabrikantens instruksjoner.
Sweden only VARNING
Explosionsfara vid felaktigt batteribyte.
Använd samma batterityp eller en ekvivalent typ som rekommenderas av
apparattillverkaren.
Kassera använt batteri enligt fabrikantens instruktion.
Finland only VAROlTUS
Paristo voi räjähtää, los se on virheellisesti asennettu.
Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppiin.
HävitäKäytetty paristo valmistajan ohjeiden mukaisesti.
ALL Areas CAUTION
“Replace only with the same or equivalent type recommended by the manufacturer.
Dispose of used IC Package according to the manufacturer’s instructions.”
Germany only VORSICHT!
”Austausch nur durch denselben oder einen vom Hersteller empfohlenen, gleichwertigen
typ. Entsorgung gebrauchter Batterien nach Angaben des Herstellers.

FrameMaker Ver5.5E(PC) Di450/Di550 GENERAL
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2. SPECIFICATION
COPY MEDIUM ❍: Permissible -: Not permissible C: Crosswise
*1: 20 sheets or less
TYPE
ORIGINAL SCANNING SYSTEM
PHOTOCONDUCTOR
COPYING SYSTEM
RESOLUTION
PAPER FEEDING SYSTEM
EXPOSURE SYSTEM
DEVELOPING SYSTEM
CHARGING SYSTEM
IMAGE TRANSFER SYSTEM
PAPER SEPARATING SYSTEM
FUSING SYSTEM
PAPER DISCHARGING SYSTEM
MAXIMUM ORIGINAL SIZE
:
:
:
:
:
:
:
:
:
:
:
:
:
:
Console
Lens Reduction Type CCD Line Sensor
Organic Photoconductor
Electrostatic Dry Powdered Image Transfer to Plain
Paper
600 dpi ×600 dpi
4-Way system
Multi Bypass Table : 50 sheets of paper
1st Drawer (Universal) : 500 sheets of paper
2nd Drawer (Universal) : 500 sheets of paper
3rd Drawer : 2500 sheets of paper
5-Way system
Multi Bypass Table : 50 sheets of paper
1st Drawer (Universal) : 500 sheets of paper
2nd Drawer (Universal) : 500 sheets of paper
3rd Drawer : 500 sheets of paper
4th Drawer : 500 sheets of paper
Mirror Scanning, Slit Exposure
New Micro-Toning System
Comb Electrode DC Negative Corona with
Scorotron System
Visible Image Transfer by means of a Single-Wire
DC Negative Corona with Corotron System
AC Corona with Corotron System, plus Paper Sep-
arator Finger
Heat Roller
Charge Neutralizing Brush
Metric-A3L; Inch-11 ×17 L (L: Lengthwise)
Paper Source 1st to 2nd
Drawer 4WAY (LCC) 5WAY (3rd to 4th) Multi Bypass Table Duplex
Medium
Plain paper
(60 to 90 g/m2)❍❍❍❍❍
Translucent paper –––❍*1 -
Transparencies –––❍*1 -
Thick paper
(90 to 157 g/m2)–––❍*1 -
Recycled paper ❍❍❍❍❍
Dimensions
Maximum
(Width ×Length) 297 ×432 mm A4C 297 ×432 mm 297 ×432 mm
11-3/4 ×17
Inch 297 ×432 mm
Minimum
(Width ×Length) 140 ×182 mm 8-1/2 ×11 C Inch 210 ×280 mm 100 ×140 mm 4 ×5-3/4 Inch 140 ×182 mm

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CONTINUOUS COPY SPEED (copies/minute) Fed from 1st Drawer/Memory Mode:
45 Piece Copy Machine
55 Piece Copy Machine
L: Lengthwise; C: Crosswise
ZOOM RATIOS
MULTIPLE COPIES
WARMING-UP TIME
FIRST COPY TIME
:
:
:
1 to 999
4 minute with room temperature of 20 °C and rated
power voltage
A4C: 4.0 second or less
(in Full size Mode using 1st Drawer)
Area Zoom Ratio Size ×1.000 Area Zoom Ratio Size ×1.000
Metric
A3L
A4L
A4C
B4L
28
36
45
32
Inch
11 ×17 (L)
8-1/2 ×11 (L)
8-1/2 ×11 (C)
8-1/2 ×14 (L)
28
38
45
32
Area Zoom Ratio Size ×1.000 Area Zoom Ratio Size ×1.000
Metric
A3L
A4L
A4C
B4L
32
43
55
36
Inch
11 ×17 (L)
8-1/2 ×11 (L)
8-1/2 ×11 (C)
8-1/2 ×14 (L)
31
45
55
37
Fixed
Area Mode Metric Inch
Full Size ×1.000 ×1.000
Reduction ×0.816
×0.707
×0.500
×0.785
×0.733
×0.647
×0.500
Enlargement ×1.154
×1.414
×2.000
×1.214
×1.294
×1.545
×2.000
Variable 25 % to 400 % (in 0.1 % increments)
LENS
EXPOSURE LAMP
FUSING TEMPERATURE
:
:
:
Through Lens (F = 4.0, f = 62 mm)
Rare Gas Fluorescent Light (20 W)
190 °C

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POWER/CURRENT CONSUMPTION (copier only)
ENVIRONMENTAL CONDITIONS
Voltage Exposure Lamp
(Rating) Fusing Heater Lamp (Rating) Max. Power Consumption (Full System) In Standby
115 V
120 V 24 V
20 W
120 V
Upper: 850 W
Lower: 200 W 1430 W ± 10 % 1230 W ± 10 %
220 V
240 V
230 V
Upper: 1011 W
Lower: 200 W 1700 W ± 10 % 1380 W ± 10 %
POWER REQUIREMENTS : 115 V, 120 V, 127 V, 220-240 V; 50/60 Hz
COPIER DIMENSIONS
COPIER WEIGHT
:
:
Width .... 645 mm (25-2/5 inch)
Depth .... 756 mm (29-3/4 inch)
Height ... 1032 mm (40-3/5 inch) With Cabinet
158.5 kg (348-1/4 lbs)
(Copier: 113kg, Cabinet: 45.5kg)
✽Excluding the Copy Tray, Starter, Toner, and
Paper

FrameMaker Ver5.5E(PC) Di450/Di550 GENERAL
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3. PRECAUTIONS FOR INSTALLATION
3-1. Installation Site
To ensure safety and utmost performance of the copier, the copier should NOT be used in a
place:
•Where it will be subjected to extremely high or low temperature or humidity.
•Where it will be subjected to sudden fluctuations in either temperature or humidity.
•Which is exposed to direct sunlight.
•Which is in the direct air stream of an air conditioner, heater, or ventilator.
•Which has poor ventilation or is dusty.
•Which does not have a stable, level floor or where it will receive undue vibration.
•Which is near any kind of heating device.
•Which is near volatile flammables (thinner, gasoline, etc.).
•Where it may be splashed with water.
•Which puts the operator in the direct stream of exhaust from the copier.
•Where ammonia gas might be generated.
3-2. Power Source
•If any other electrical equipment is sourced from the same power outlet, make sure that
the capacity of the outlet is not exceeded.
•Use a power source with little voltage fluctuation.
•Never connect by means of a multiple socket any other appliances or machines to the
outlet being used for the copier.
•Ensure that the copier does not ride on the power cord or communication cable of other
electrical equipment, and that it does not become wedged into or underneath the mecha-
nism.
•Make the following checks at frequent intervals:
✽Is the power plug abnormally hot?
✽Are there any cracks or scrapes in the cord?
✽Has the power plug been inserted fully into the outlet?
✽Does something, including the copier itself, ride on the power cord?
Use an outlet with a capacity of 115/120 V, 15 A or more. 200-220 V, 20 A or more.
3-3. Grounding
•Always ground the copier to prevent receiving electrical shocks in the case of electrical
leakage.
•Connect the ground wire to the ground terminal of the outletor a grounding contact which
complies with the local electrical standards.
•Never connect the ground wire to a gas pipe, the ground wire for a telephone, lightning
arrester, or a water pipe for fear of fire and electrical shock.

FrameMaker Ver5.5E(PC) Di450/Di550 GENERAL
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4. PRECAUTIONS FOR USE
4-1. To ensure that the copier is used in an optimum condition
•Never place a heavy object on the copier or subject the copier to shocks.
•Insert the power plug all the way into the outlet.
•Do not attempt to remove any panel or cover which is secured while the copier is making
copies.
•Do not turn OFF the copier while it is making copies.
•Provide good ventilation when making a large number of copies continuously.
•Never use flammable sprays near the copier.
•If the copier becomes inordinately hot or produces abnormal noise, turn it OFF and
unplug it.
•Do not turn ON the power switch at the same time when you plug the power cord into the
outlet.
•When unplugging the power cord, do not pull on the cord; hold the plug and pull it out.
•Do not bring any magnetized object near the copier.
•Do not place a vase or vessel containing water on the copier.
•Be sure to turn OFF the power switch at the end of the workday or upon power failure.
•Use care not to drop paper clips, staples, or other small pieces of metal into the copier.
4-2. Operating Environment
The operating environmental requirements of the copier are as follows.
•Temperature: 10 to 32 °C
•Humidity: 15 to 85 %
•Rate of temperature change: 10 °C/h
•Rate of humidity change: 10 %/h
4-3. Power Requirements
The power source voltage requirements are as follows.
•Voltage fluctuation: AC 115, 120, 220, 240 V
± 10 % (copying performance assured)
(paper feeding performance assured)
•Frequency fluctuation: 50/60 Hz ± 0.3 Hz
4-4. Note
•It is prohibited to copy paper and hard currencies, government securities, and municipal
bonds (even when they are stamped as “Sample”).
•For fear of infringement of copyright, it is also prohibited to copy copyrighted works,
including books, music, works of art, maps, drawings,motion pictures, and photos except
when the copy is to be used only personally.
+10 %
-15 %

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5. HANDLING OF CONSUMABLES
Before using any consumables, always read the label on its container carefully.
•Paper can be easily damaged by dampness. To prevent absorption of moisture, store
paper, which has been removed from its wrapper but not loaded in the drawer, in a sealed
plastic bag in a cool, dark place.
•Keep consumables out of the reach of children.
•Do not touch the PC Drum with bare hands.
•The same sized paper is of two kinds, short grain and long grain. Short grain paper
should only be fed through the copier crosswise, long grain paper should only be fed
lengthwise.
•If your hands become soiled with toner, wash them with soap and water.
•Do not throw away any used consumables (PC Drum, starter, toner, etc.). They are to be
collected.
•Do not burn, bury in the ground, or throw into the water any consumables (PC Drum,
starter, toner, etc.).
•Do not store consumables in a place which:
✽Is hot and humid.
✽Is subject to direct sunlight.
✽Has an open flame nearby.
6. OTHER PRECAUTIONS
Use the following precautions when performing service jobs for a copier that uses a laser.
•When a service job needs to be performed in the laser beam path, such as when working
around the printerhead or PC Drum, be sure first to unplug the power cord of the copier
from the outlet.
•If the job requires that the power cord be left plugged in, observe the following precau-
tions.
•Take off your watch, ring and any other reflective object and wear laser protective gog-
gles.
•Keep users away from the job site.
•Do not bring a highly reflective tool into the laser beam path during the service job.

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7. SYSTEM OPTIONS
1. Copier
2. 2 Way Paper Feed Cabinet PF-208
3. Large Capacity Cassette PF-115
4. Duplexing Paper Feed Cabinet PF-7D
5. Data Controller D-103
6. Plug-In Counter
7. Electronic Document Handler EDH-3
8. Original Cover OC-1
9. Large Capacity Cassette C-306
10. Large Capacity Cassette C-306L
11. 32 MB Memory M32-2
12. Hard Disk Drive Kit HDD-1
13. Finisher FN-105, FN106
14. Data Terminal DT-105 (MC Only)
4002G506AA
4002G511AA
4002G501AA
4002G504AA 4002G503AA
4002G505AA
1
8
14
4002G507AA
4002G508AA
7
5
10
3, 4
2
4002G509AA
12
13
11
6
1145M035AA
4002G502AA
9

FrameMaker Ver5.5E(PC) Di450/Di550 MECHANICAL/ELECTRICAL
00.08.25
MECHANICAL/
ELECTRICAL
11563

FrameMaker Ver5.5E(PC) Di450/Di550 MECHANICAL/ELECTRICAL
00.08.25
i
CONTENTS
1. CROSS SECTIONAL VIEW ............................................................................M-1
2. COPY PROCESS ............................................................................................M-2
3. DRIVE SYSTEM ..............................................................................................M-4
4. SEQUENTIAL EXPLANATION ........................................................................M-5
5. IMAGE STABILIZATION SYSTEM ..................................................................M-6
5-1. AIDC Sensor ............................................................................................M-7
5-2. Image Stabilization System Control .........................................................M-8
6. PC DRUM SECTION .......................................................................................M-9
6-1. PC Drum Drive Mechanism .....................................................................M-9
6-2. Grounding of the PC Drum ......................................................................M-10
7. PC DRUM CHARGING SECTION ...................................................................M-11
8. IMAGE READING SECTION ...........................................................................M-12
8-1. Exposure Components Section ...............................................................M-13
8-2. Exposure Lamp Control ...........................................................................M-14
8-3. Image Processing Process ......................................................................M-16
8-4. Image Density Control .............................................................................M-18
(1) Auto Exposure Control ....................................................................M-18
(2) Manual Exposure Control ................................................................M-21
8-5. Scanner and Mirrors Carriage Movement Mechanism ............................M-23
(1) Scanner Movement Mechanism ......................................................M-23
(2) 2nd/3rd Mirrors Carriage Movement Mechanism ............................M-23
8-6. Scanner Motor Drive Control ...................................................................M-24
9. MEMORY SECTION ........................................................................................M-25
9-1. Image Processing Process ......................................................................M-25
10. Original Size Detecting Section .......................................................................M-26
10-1.Original Size Detecting Operation ...........................................................M-26
10-2.Original Size Detecting Sensors Locations .............................................M-27
10-3.Original Size Detection ............................................................................M-28
10-4.Original Size Detection Timing ................................................................M-29
11. PH SECTION ...................................................................................................M-30
11-1.Image Processing Process ......................................................................M-31
11-2.Laser Emission Timing (SOS Signal) ......................................................M-33
12. DEVELOPING UNIT SECTION .......................................................................M-35
12-1.Developing Unit Drive Mechanism ..........................................................M-36
12-2.Sleeve/Magnet Roller ..............................................................................M-37
12-3.Doctor Blade ............................................................................................M-37
12-4.Developing Bias .......................................................................................M-38
12-5.ATDC Sensor ..........................................................................................M-39
(1) ATDC Sensor Automatic Adjustment ..............................................M-39
12-6.Toner Replenishing Control .....................................................................M-40
12-7.Toner Supply Hole Covering/Uncovering Mechanism .............................M-40
12-8.Toner Bottle Home Position Detection Mechanism .................................M-41
12-9.Toner Bottle Vibration Mechanism ..........................................................M-41
12-10.Main Hopper Toner Replenishing Mechanism ......................................M-42
12-11.Main Hopper Locking Mechanism .........................................................M-42
12-12.Sub Hopper Toner Replenishing Mechanism ........................................M-43

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12-13.Sub Hopper Toner Empty Detecting Mechanism ..................................M-44
13. PAPER TAKE UP/FEED SECTION .................................................................M-45
13-1.Drawer In Position Detection ...................................................................M-46
13-2.Paper Empty Detection Mechanism ........................................................M-47
13-3.Drawer Paper Lifting/Lowering Mechanism .............................................M-48
13-4.Paper Level Detection Mechanism ..........................................................M-50
13-5.Universal Tray Paper Size Detection Mechanism ...................................M-51
13-6.Paper Take Up Mechanism .....................................................................M-53
(1) Paper Separating Mechanism .........................................................M-53
(2) Paper Pressure Release Mechanism ..............................................M-54
(3) Paper Take Up Roll Retracting Mechanism ....................................M-54
13-7.Paper Take Up Control ............................................................................M-55
(1) Paper Take Up Motor Control ..........................................................M-55
(2) Paper Take Up Retry Control ..........................................................M-55
(3) Paper Take Up Interval Control .......................................................M-56
(4) Double Feed Paper Take Up Control ..............................................M-56
13-8.Vertical Transport Drive Mechanism .......................................................M-57
14. MANUAL FEED TABLE SECTION ..................................................................M-58
14-1.Manual Take Up Roll Pressure Mechanism ............................................M-59
14-2.Manual Feed Paper Separating Mechanism ...........................................M-59
14-3.Manual Feed Paper Empty Detection Mechanism ..................................M-60
14-4.Manual Feed Take Up Control ................................................................M-60
15. TRANSPORT/SYNCHRONIZING ROLLERS SECTION .................................M-61
15-1.Paper Dust Remover ...............................................................................M-61
15-2.Transport Roller Drive Mechanism ..........................................................M-62
15-3.Synchronizing Roller Drive Mechanism ...................................................M-62
16. IMAGE TRANSFER AND PAPER SEPARATION SECTION ..........................M-63
16-1.PC Drum Paper Separator Fingers Section ............................................M-64
(1) Finger Pressing Detection Mechanism ............................................M-64
(2) Finger Back and Forth Detection Mechanism .................................M-64
17. PC DRUM CLEANING SECTION ....................................................................M-65
17-1.Cleaning Blade Moving Mechanism ........................................................M-65
17-2.Toner Conveying/Collecting Mechanism .................................................M-66
18. MAIN ERASE SECTION ..................................................................................M-67
19. TRANSPORT SECTION ..................................................................................M-68
20. FUSING UNIT SECTION .................................................................................M-69
20-1.Fusing Unit Drive Mechanism ..................................................................M-70
20-2.Fusing Rollers Pressure Mechanism .......................................................M-71
20-3.Fusing Roller Cleaning Mechanism .........................................................M-72
(1) Cleaning Web Take Up Mechanism ................................................M-72
20-4.Fusing Temperature Control ....................................................................M-73
20-5.Mechanism and Control of Fusing Roller Small-Amount Turning ............M-74
20-6.CPM Control ............................................................................................M-75
21. EXIT/DUPLEX SWITCHING SECTION ...........................................................M-76
21-1.Exit/Duplex Switching Mechanism ...........................................................M-77
22. TURNOVER SECTION ....................................................................................M-78
22-1.Turnover Drive Mechanism .....................................................................M-79

FrameMaker Ver5.5E(PC) Di450/Di550 MECHANICAL/ELECTRICAL
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22-2.Turnover Control ......................................................................................M-80
22-3.Turnover Roller Separation Control .........................................................M-81
22-4.Turnover/Exit Mechanism ........................................................................M-82
(1) Selection of Turnover or Exit Path ...................................................M-82
(2) Path for Accommodating Paper Longer Than A4L ..........................M-82
23. OTHER MECHANISM .....................................................................................M-83
23-1.Memory Backup .......................................................................................M-83
23-2.Flash Memory ..........................................................................................M-84
23-3.Dehumidifying Mechanism ......................................................................M-85
(1) PC Drum Dehumidifying ..................................................................M-85
(2) Paper Dehumidifying Mechanism ....................................................M-85
23-4.Cooling Mechanism .................................................................................M-86
(1) IR Section Cooling Mechanism .......................................................M-86
(2) Fusing Section Cooling Mechanism ................................................M-87
(3) Copier Interior Cooling Mechanism .................................................M-88
(4) Power Supply Section Cooling Mechanism .....................................M-89