Mita DP-2800 User manual

DP-2800 (MCA) S/M
SERVICE
MANUAL
Published in June ’98
5A270760
R
DP-2800
DP-2800

SERVICE
MANUAL
DP-2800

Safety precautions
This booklet provides safety warnings and precautions for our service
personnel to ensure the safety of their customers, their machines as well
as themselves during maintenance activities. Service personnel are
advised to read this booklet carefully to familiarize themselves with the
warnings and precautions described here before engaging in
maintenance activities.

Safety warnings and precautions
Various symbols are used to protect our service personnel and
customers from physical danger and to prevent damage to their
property. These symbols are described below:
DANGER: High risk of serious bodily injury or death may result from
insufficient attention to or incorrect compliance with warning
messages using this symbol.
WARNING: Serious bodily injury or death may result from insufficient
attention to or incorrect compliance with warning messages
using this symbol.
CAUTION: Bodily injury or damage to property may result from
insufficient attention to or incorrect compliance with warning
messages using this symbol.
Symbols
The triangle ( ) symbol indicates a warning including
danger and caution. The specific point of attention is shown
inside the symbol.
General warning.
Warning of risk of electric shock.
Warning of high temperature.
indicates a prohibited action. The specific prohibition is
shown inside the symbol.
General prohibited action.
Disassembly prohibited.

indicates that action is required. The specific action
required is shown inside the symbol.
General action required.
Remove the power plug from the wall outlet.
Always ground the copier.
1. Installation Precautions
WARNING
•Do not use a power supply with a voltage other than that specified.
Avoid multiple connections to one outlet: they may cause fire or electric
shock. When using an extension cable, always check that it is
adequate for the rated current. ..............................................................
•Connect the ground wire to a suitable grounding point. Not grounding
the copier may cause fire or electric shock. Connecting the earth wire
to an object not approved for the purpose may cause explosion or
electric shock. Never connect the ground cable to any of the following:
gas pipes, lightning rods, ground cables for telephone lines and water
pipes or faucets not approved by the proper authorities. ......................
CAUTION
•Do not place the copier on an infirm or angled surface: the copier may
tip over, causing injury. ..........................................................................
•Do not install the copier in a humid or dusty place. This may cause fire
or electric shock.....................................................................................
•Do not install the copier near a radiator, heater, other heat source or
near flammable material. This may cause fire.......................................
•Allow sufficient space around the copier to allow the ventilation grills to
keep the machine as cool as possible. Insufficient ventilation may
cause heat buildup and poor copying performance...............................

•Always handle the machine by the correct locations when moving it....
•Always use anti-toppling and locking devices on copiers so equipped.
Failure to do this may cause the copier to move unexpectedly or
topple, leading to injury..........................................................................
•Avoid inhaling toner or developer excessively. Protect the eyes. If toner
or developer is accidentally ingested, drink a lot of water to dilute it in
the stomach and obtain medical attention immediately. If it gets into the
eyes, rinse immediately with copious amounts of water and obtain
medical attention. ..................................................................................
•Advice customers that they must always follow the safety warnings
and precautions in the copier’s instruction handbook............................
2. Precautions for Maintenance
WARNING
•Always remove the power plug from the wall outlet before starting
machine disassembly.............................................................................
•Always follow the procedures for maintenance described in the service
manual and other related brochures......................................................
•Under no circumstances attempt to bypass or disable safety features
including safety mechanisms and protective circuits.............................
•Always use parts having the correct specifications. ..............................
•Always use the thermostat or thermal fuse specified in the service
manual or other related brochure when replacing them. Using a piece
of wire, for example, could lead to fire or other serious accident. .........
•When the service manual or other serious brochure specifies a
distance or gap for installation of a part, always use the correct scale
and measure carefully............................................................................
•Always check that the copier is correctly connected to an outlet with a
ground connection. ................................................................................

•Check that the power cable covering is free of damage. Check that the
power plug is dust-free. If it is dirty, clean it to remove the risk of fire or
electric shock.........................................................................................
•Never attempt to disassemble the optical unit in machines using lasers.
Leaking laser light may damage eyesight. ............................................
•Handle the charger sections with care. They are charged to high
potentials and may cause electric shock if handled improperly.............
CAUTION
•
Wear safe clothing. If wearing loose clothing or accessories such as
ties, make sure they are safely secured so they will not be caught in
rotating sections. ...................................................................................
•Use utmost caution when working on a powered machine. Keep away
from chains and belts. ...........................................................................
•Handle the fixing section with care to avoid burns as it can be
extremely hot. ........................................................................................
•Check that the fixing unit thermistor, heat and press rollers are clean.
Dirt on them can cause abnormally high temperatures. ........................
•Do not remove the ozone filter, if any, from the copier except for
routine replacement...............................................................................
•Do not pull on the AC power cord or connector wires on high-voltage
components when removing them; always hold the plug itself..............
•Do not route the power cable where it may be stood on or trapped. If
necessary, protect it with a cable cover or other appropriate item. .......
•Treat the ends of the wire carefully when installing a new charger wire
to avoid electric leaks. ...........................................................................
•Remove toner completely from electronic components.........................
•Run wire harnesses carefully so that wires will not be trapped or
damaged................................................................................................

•After maintenance, always check that all the parts, screws, connectors
and wires that were removed, have been refitted correctly. Special
attention should be paid to any forgotten connector, trapped wire and
missing screws. .....................................................................................
•Check that all the caution labels that should be present on the machine
according to the instruction handbook are clean and not peeling.
Replace with new ones if necessary......................................................
•Handle greases and solvents with care by following the instructions
below: ....................................................................................................
·Use only a small amount of solvent at a time, being careful not to spill.
Wipe spills off completely.
·Ventilate the room well while using grease or solvents.
·Allow applied solvents to evaporate completely before refitting the
covers or turning the main switch on.
·Always wash hands afterwards.
•Never dispose of toner or toner bottles in fire. Toner may cause
sparks when exposed directly to fire in a furnace, etc...........................
•Should smoke be seen coming from the copier, remove the power
plug from the wall outlet immediately.....................................................
3. Miscellaneous
WARNING
•Never attempt to heat the drum or expose it to any organic solvents
such as alcohol, other than the specified refiner; it may generate toxic
gas.........................................................................................................

1-1-1
5A2
CONTENTS
Chapter 1 PRODUCT INFORMATION
Printer identification labeling ........................................................................ 1-1
Printer Specifications ................................................................................... 1-2
Front and rear views .................................................................................... 1-5
Options......................................................................................................... 1-7
Environmental requirements ........................................................................ 1-8
About the toner .......................................................................................... 1-11
Chapter 2 INSTALLATION/OPERATION
Unpacking ................................................................................................... 2-1
Installing the printer ..................................................................................... 2-3
Expanding memory ..................................................................................... 2-8
Installing KPDL .......................................................................................... 2-13
Using the Control Panel ............................................................................ 2-14
Chapter 3 MAINTENANCE/ADJUSTMENTS
Life expectancy of modules ......................................................................... 3-1
Toner container ............................................................................................ 3-2
Cleaning the printer ...................................................................................... 3-4
Replacing the developer unit........................................................................ 3-9
Updating the firmware ................................................................................ 3-12
Adjusting the transfer bias.......................................................................... 3-16
Chapter 4 OPERATION OVERVIEW
Electrophotographics system ...................................................................... 4-1
Paper feeding system ............................................................................... 4-18
Print timing charts ..................................................................................... 4-29
Basic engine functions .............................................................................. 4-32
Engine controller system ........................................................................... 4-33
Logic controller system ............................................................................. 4-43
Chapter 5 DISASSEMBLY
General Instructions ..................................................................................... 5-1
Before starting disassembly ......................................................................... 5-2
Disassembly................................................................................................. 5-3

1-1-2
5A2
Chapter 6 TROUBLESHOOTING
Board layouts .............................................................................................. 6-1
Diagnostic ................................................................................................... 6-2
General error handling ................................................................................ 6-7
Error messages ........................................................................................... 6-8
Call-Service person errors ........................................................................ 6-13
Print quality problems ................................................................................ 6-33
Correcting a paper jam .............................................................................. 6-41
Correcting paper jams ............................................................................... 6-43
Appendix A PRINTER INTERFACE
Parallel interface .........................................................................................A-1
Serial interface ............................................................................................A-3
Appendix B STATUS PAGE
Status page ..................................................................................................B-1

1-1-5
5A2
CONTENTS
Chapter 1 PRODUCT INFORMATION
Printer identification labeling ................................................................................... 1-1
US/Canada version ...................................................................................................... 1-1
Printer Specifications ................................................................................................ 1-2
Recommended flash cards .......................................................................................... 1-4
Front and rear views .................................................................................................. 1-5
Front view .................................................................................................................... 1-5
Internal assemblies ...................................................................................................... 1-6
Rear view ..................................................................................................................... 1-6
Options ....................................................................................................................... 1-7
Environmental requirements .................................................................................... 1-8
Environmental conditions ............................................................................................. 1-8
Clearance..................................................................................................................... 1-9
Places to avoid ........................................................................................................... 1-10
Note on power............................................................................................................ 1-10
About the toner ........................................................................................................ 1-11
Toner container handling ........................................................................................... 1-11
Toner storage ............................................................................................................. 1-12

5A2
1-1
Printer identification labelling
The printer has a label bearing its model and serial number at its back. This label also
contains other safety precautions.
US/Canada version
DP-2800
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
(1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference
that may cause undesired operation.
This Class B digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la classe B est conforme à la norme NMB-003 du Canada.
THIS LASER PRODUCT CONFIRMS TO THE APPLICABLE
REQUIREMENTS OF FEDERAL REGULATIONS 21 CFR
CHAPTER 1, SUBCHAPTER J.
MITA INDUSTRIAL CO.,LTD.
2-28 1-CHOME TAMATSUKURI CHUO-KU OSAKA JAPAN MADE IN JAPAN
MANUFACTURED
60Hz 120V 10A
PRECAUCION
RETIRE EL CORDON ELECTRICO ANTES
DE REALIZAR SERVICIO O REEMPLAZAR
EL FUSIBLE.
ATTENTION
POUR PRÉVENIR LES CHOCS
ÉLECTRIQUES, COUPER L,ALIMENTATION
AVANT DE REMPLACER LE FUSIBLE.
CAUTION
REMOVE POWER CORD
BEFORE SERVICE AND
FUSE REPLACEMENT.
FOR HOME OR OFFICE USE
Tested To Comply
With FCC Standards
8J68
UL1950
PRINTER
YM

5A2
1-2
Printer Specifications
Engine
Specification
Print method ……………………… Electrophotography laser scan
Print speed (when printing
multiple copies of the
same page) ……………………… A4/11" ×81/2": 28 pages/min., B4 (257 ×364 mm):
18 pages/min., A3/11" ×17": 16 pages/min.
Resolution (dpi) ………………… 600 horizontal/600 vertical
Smoothing ………………………… KIR 2 (2400 horizontal/600 vertical)
First print (A4/11" ×81/2" or letter,
23°C), depends on input data …… 10 seconds or less (75 seconds or less with sleep
mode on)
Warm-up time at 23°…………… 65 seconds or less
Maximum duty cycle (A4) ……… 100,000 pages/month
Laser diode ……………………… Visible laser
Main charger……………………… Scorotron wire
Transferring ……………………… Biased roller
Separation………………………… DC
Drum cleaning …………………… Blade
Drum discharging………………… LED array
Fuser ……………………………… Heat and pressure
Paper ……………………………… Plain paper (as specified separately)
Capacity of paper feed tray
(80 g/m2[0.11 mm thickness]) … Cassette: 500 sheets, MP tray: 100 sheets
Capacity of output trays
(80 g/m2[0.11 mm thickness]) … 500 sheets
Controller
Specification
CPU ……………………………… PowerPC603e/100 MHz
System ROM size ……………… 4 MB, flash DIMM or masked DIMM
Resident font ROM size ………… 4 MB
Option fonts ROM ……………… 2 MB (PK-4)
Main RAM ………………………… 4 MB
Additional RAM (SIMM) ………… 64 MB maximum (72-pin SIMM ×2)
Memory card……………………… SRAM or flush, JEIDA 4.2/PCMCIA 2.1
See Recommended flash cards in this chapter.
Host interface …………………… Parallel: High-speed, bi-directional (IEEE1284),
Serial: RS-232C/RS-422A, Option, KCIO (HDD).
Page description language……… Prescribe II
Standard emulation modes …… HP LaserJet 5Si, IBM Proprinter X24E, Diablo 630,
Epson LQ-850

5A2
1-3
Weight and dimensions
Specification
Main unit ………………………… Width: 56 cm (22")
Height: 34.5 cm (13.6")
Depth: 56.6 cm (22.3")
Weight: 41.5 kg (18.7 lb.)
Paper feeder ……………………… Width: 56 cm (22")
Height: 24.7 cm (9.7")
Depth: 56.6 cm (22.3")
Weight: 19.5 kg (8.8 lb.)
Power requirements
Specification
Voltage requirements …………… US/Canada: 120 V AC ±10%, 60 Hz ±2%.
Watts ……………………………… Maximum: 1200 W
Normal operation: 677 W
Standby: 215 W
Sleeping: 34 W
Environmental requirements
Specification
Operating temperature and
humidity …………………………… 10 to 32.5°C (50 to 90.5°F), 20 to 80% RH
Maximum altitude………………… 2,000 m (6,500 feet)
Noise emission (Excluding
peaks, measured at 1m from
printer, as per ISO7779) ………… 50 dB (A) maximum/38 dB (A) at standby/
unmeasurably low at sleeping)

5A2
1-4
Recommended flash cards
The printer provide support for a JEIDA/PCMCIA category of memory card in both SRAM
and flush types of up to 32 MB. Following is a list of makes and models of flush cards
recommended for use with the printers.
Note that the flush card to be used should be operable on 5 V DC.
Model Capacity
AMD AmC001CFLKA 1 MB
AmC002CFLKA 2 MB
AmC004CFLKA 4 MB
AmC010CFLKA 10 MB
AmC004DFLKA 4 MB
AmC008DFLKA 8 MB
AmC020DFLKA 20 MB
Fujitsu MB98A81063 1 MB
MB98A81183 2 MB
MB98A81273 4 MB
MB98A81373 8 MB
MB98A81473 16 MB
Panasonic BN-02MHF4C (CC) 2 MB
BN-04MHF4C (CC) 4 MB
Centennial FL01M-20-11114-03 1 MB
FL02M-20-11114-03 2 MB
FL04M-20-11114-03 4 MB
FL08M-20-11114-03 8 MB
Maxell EF-2M-TB (DC) 2 MB
EF-4M-TB (DC) 4 MB
EF-8M-TB (DC) 8 MB
EF-16M-TB (DC) 16 MB

5A2
1-5
Front and rear views
Front view
Front control panel
Paper-full sensor
Front cover
MP (multi-
purpose) tray
Paper feeder
Option feeder
connector
Vent
Paper feeder side cover
Upper paper cassette
Lower paper cassette
Power switch
Face-up paper tray
Left side cover
Face-down tray
Left side view

5A2
1-6
Internal assemblies
Toner container
Feed unit handle
Fuser release
lever
Fuser unit
Toner container release lever
(Green colored)
Feed unit
Drum unit
Drum release lever
(Green colored)
Developer release lever
Developer
Memory card slot
Harddisk
drive slot
Parallel interface
connector
Serial interface
connector
Paper cassette
access door Option interface
slot cover
Rear panel
Power receptacle
Rear view

5A2
1-7
Options
Theexampleoptionunitsareshownbelow.The instructionhandbook comewiththeprinter
has more information regarding the accessories available for this model.
Paper feeder
supplied as
standard
First optional
paper feeder
Second optional
paper feeder
Bulk paper
stacker
Inboard duplexer
Wheels (Caster kit)

5A2
1-8
Environmental requirements
Environmental conditions
The Environmental requirements section on page Chapter 1-2 should be observed to
ensurethe optimum operationof theprinter. Theuse ofthe printerin alocation whichdoes
not satisfy the requirements may result in troubles and risk shortening its service life.
The printer will work best if it is installed in a location that is:
• Level and well supported (Place the printer on a sturdy table or desk.)
• Not exposed to sunlight or other bright light (not next to an uncurtained window). Do not
place the printer on an unstable cart, stand, or table.
• Near an AC wall outlet, preferably one that can be used for the printer alone. The outlet
should have a ground slot, or an adapter should be used. If you use an extension cord,
thetotallengthofthepowercordplusextensioncordshouldbe17feetor5metersorless.
• Well ventilated, not too hot or cold, and not too damp or dry (See section Environmental
requirements on page Chapter 1-2). If you install the printer where the temperature or
humidityis outside therequirements in sectionEnvironmental requirementsin chapter1,
thebestprintqualitymaynotbe expected and there willbeanincreasedchanceofpaper
jams.
• Provide a sufficient clearances around the printer to ensure ventilation and ease of
access.

5A2
1-9
Clearance
Allowthe necessary minimum clearance on all sides of theprinter (below).A totalspace of
92 by 138 cm (36 by 54") is needed.
Clearance Dimensions
Left 145 cm (17.7"), or 30 cm (12") if the face-up tray is not used.
Front 260 cm (24")
Right 345 cm (17.7")
Back 420 cm (8")
Above 530 cm (12")
2
1
3
4
5