Kyocera Mita FS-6750 User manual

SERVICE
MANUAL

FS-6750 Service Manual
©Kyocera Corporation 2001 All rights reserved. Export Edition
Notice
The information in this manual is
subject to change without notification.
Additional pages may be inserted in
future editions. The user is asked to
excuse any technical inaccuracies or
typographical errors in the present
edition.
No responsibility is assumed if
accidents occur while the user is
following the instructions in this
manual. No responsibility is assumed
for defects in the printer's firmware.
The contents of this manual are
protected by copyright. No part of this
manual may be reproduced or copied
by any means without the permission
of the copyright holder. The printer's
firmware (contents of its read-only
memory) is similarly protected by
copyright.
Trademark Notice
PRESCRIBE is a registered
trademark of Kyocera Corporation.
PRESCRIBE II, KIR, Kyocera Image
Refinement, Ecosys, and Ecotone are
trademarks of Kyocera Corporation.
Diablo 630 is a product of Xerox
Corporation. IBM Proprinter X-24E
is a product of International Business
Machine Corporation. Epson LQ-850
is a product of Seiko Epson
Corporation. HP LaserJet 5Si and
HP-7475A are product of Hewlett-
Packard Company. Hewlett-Packard,
PCL, and HP-GL are registered
trademarks of Hewlett-Packard
Company. Centronics is a trade name
of Centronics Data Computer Corp.
This Kyocera printer uses
PeerlessPrint5 to provide the HP
LaserJet IV compatible PCL5e
language emulation. PeerlessPrint5 is
a trademark of the Peerless Group,
Redondo Beach, CA 90278, U.S.A.
Warning
This equipment has been certified to
comply with the limits for a Class B
computing device, pursuant to
Subpart J of Part 15 of FCC Rules.
Only peripherals (computer
input/output devices, terminals, etc.)
certified to comply with the Class B
limits may be attached to this
equipment. Operation with non-
certified peripherals is likely to result
in interference to radio and TV
reception.
Check that the cable is wired
correctly. If an IBM communication
adapter cable type 1502067 is used, it
will have to be resoldered the wiring
at the printer end of the cable. The
procedure is as follows.

Conventions/Preface
iii
Conventions
Throughout this manual, the following conventions are used:
Color (red) is available when viewed online to emphasize important notices.
CAPITAL letters are used to name printer parts and assemblies.
Italic letters refer related chapters or sections or documentations.
Bold letters are also used for emphasis wherever italics may cause a confuse.
This symbol followed by Warning denotes that the following paragraph(s) includes
precautions which, if ignored, could result in personal injury, and/or irrevocable
damage to the printer.
When followed by Caution this symbol denotes that the following paragraph(s)
include the precautions which, if ignored, could result in damage to the printer.

Conventions/Preface
iv
About the chapters ...
The service manual applies to the printer model Ecosys FS-6750 and its option paper
feeder PF-26. It provides information on servicing the equipment in the following
chapters:
Chapter Contents
One - Product information Includes printer specifications, product appearances, safety
information, etc.
Two - Installation and operation Provides how to install and operate the printer.
Three - Maintenance Instructs maintenance to be conducted periodically on the
printer.
Four - Operation overview Explains basic functions of the printer mechanism
including engine and logic controller systems.
Five - Disassembly Instructs removal of parts for both the printer and the
option paper feeder.
Six - Troubleshooting Provides countermeasure to follow for troubleshooting.
Appendix Contents
A - Printer interface Information regarding the printer’s parallel and serial
interfaces.
B - Status page Explains detail of the service information on the status
page.
The manual will be supplemented with chapters or appendixes accordingly.

Conventions/Preface
v
REVISION HISTORY
Version Date Replaced pages Remarks
1.00 7-Nov-01 — —
VISIT US AT OUR INTERNET HOME PAGE: http://www.kyocera.com

Conventions/Preface
vi
This page left intentionally blank

Contents
Chapter 1 PRODUCT INFORMATION
1.1 Printer identification labeling, page 1-2
1.2 Printer specifications, page 1-3
Expansion memory (DIMM), page 1-4
Memory card (CompactFlash), page 1-5
Hard disk (Microdrive), page 1-6
1.3 Front and internal views, page 1-7
Internal Component, page 1-8
1.4 Safety information, page 1-10
Laser caution label on the scanner unit, page 1-10
Ozone concentration, page 1-10
1.5 Installation, page 1-11
Environmental requirements, page 1-11
Clearance, page 1-11
Places to avoid, page 1-12
Notes on power, page 1-12
1.6 About the toner, page 1-13
Toner container handling, page 1-13
Toner storage, page 1-14

PRODUCT INFORMATION
Printer identification labeling
1-2 FS-6750
1.1 Printer identification labeling
The printer bears its model and serial numbers on a label at its back. The label also
contains other safety precautions. Figures below show the printer labels in two dif-
ferent destinations (versions).
Figure 1.1 Printer labels
Taiwan version Korea version

PRODUCT INFORMATION
Printer specifications
1-3
FS-6750
1.2 Printer specifications
Table 1. 1 Printer specifications—1/2
Item Specification
Print system Laser photoelectrography
Print speeda20 ppm for A4/Letter size lengthwise, 13 ppm for B4, 11 ppm for
A3/Ledger size
Print resolution 1800 × 600 dpi (Fast 1200 mode)
600 × 600 dpi (600 dpi mode)
Smoothing KIR (2400 dpi equiv. [horizontal] × 600 dpi [vertical])
First print for A4L at 23°C Approx. 10 seconds [Approx. 75 seconds from sleeping]
Warm-up time at 23°C 65 seconds or less
Maximum duty cycle 65,000 sheets
Laser type Invisible laser
Main charging Positive scorotron charge
Image transfer Charged roller
Drum cleaning Counter blade
Erasure Illumination by LED array
Fusing Heat and pressure
Usable paper type Plain paper
Paper cassette capacity Main cassette —Approx. 250 sheets (80g or 0.1mm thickness
paper), MP tray—Approx. 100 sheets (80g or 0.1mm thickness
paper)
Paper output tray capacity Face-down tray—Approx. 350 sheets, Face-up tray—Approx. 250
sheets
Controller section
CPU PowerPC405GF/160MHz
System ROM 4 MB (16 Mbit × 2)
Resident font ROM 2 MB (16 Mbit × 1)
Main RAM 16 MB (64 Mbit × 2) for Taiwan
32 MB (128 Mbit × 2) for Korea
Expansion RAM (DIMM) 128 MB max. (144 MB for Taiwan/160 MB for Korea in total)
Memory card CompactFlash
Host interface Parallel/option serial/option network (Taiwan)
Parallel/serial/option network (Korea)
PDL Prescribe 2e
Emulations HP LaserJet 5M, IBM Proprinter X24E, Diablo 630, Epson LQ-
850, line printer
Weight and dimensions
Width 483 mm
Height 350 mm
Depth 550 mm (incl. cassette)
Weight 21 kg
Voltage requirements Taiwan—120 V AC±10%, 60Hz ±2%, Korea—220-240V AC
±10%, 60 Hz ±2%
Watts Max. 928 W, normal 421 W, standby 122 W, sleep 16 W (Taiwan)
Max. 928 W, normal 419 W, standby 120 W, sleep 19 W (Korea)
Current consumption 7.6 A (Taiwan)/3.9 A (Korea)
Environment

PRODUCT INFORMATION
Printer specifications
1-4 FS-6750
The details outlined in this manual are subject to modification in accordance with
product improvements.
Expansion memory (DIMM)
The following memory DIMMs are available for use with the printer. For more
information about DIMM, see DIMM to be used, page 2-7.
Note Availability of the memory DIMMs, manufacturers, and specifications
may change without notice. No responsibility is assumed by Kyocera
Mita with respect to loss or damage caused by the use of these
DIMMs.
Temperature/humidity 10 to 32.5 °C/20 to 80 % RH
Altitude 2000 m
NoisebPrinting—51 dB(A), standby—38 dB(A), sleeping—unmeasur-
ably low
a. Printing the same page in copy mode
b. Excluding peaks; measured at 1m facing printer as per ISO7779
Table 1. 2 Recommended DIMMs
Manufacturer Capacity Model
Melco Inc. 16 MB PM-HP-16M-KC
32 MB PM-HP-32M-KC
64 MB PM-HP-64M-KC
128 MB PM-HP-128M-KC
Table 1. 1 Printer specifications—2/2

PRODUCT INFORMATION
Printer specifications
1-5
FS-6750
Memory card (CompactFlash)
The following memory cards are available for use with the printer. Do not insert or
remove a memory card (CompactFlash) while power is on. If the memory card is
removed while the printer is on, damage could result in the printer’s electronics or
the memory card. See Installing the option memory card (CompactFlash), page 2-
12.
Note Availability of the following memory cards (CompactFlash), manufac-
turers, and specifications may change without notice. No responsibil-
ity is assumed by kyocera Mita with respect to loss or damage caused
by the use of these memory card.
Table 1. 3 Recommended Memory cards—1/2
Manufacturer Capacity Model
SanDisk 8 MB SDCFBS-8-101
16 MB SDCFBS-16-101
24 MB SDCFBS-24-101
32 MB SDCFBS-32-101
48 MB SDCFBS-48-101
64 MB SDCFBS-64-101
96 MB SDCFBS-96-101
Viking 4 MB CF4M
8 MB CF8M
12 MB CF12M
16 MB CF16M
24 MB CF24M
32 MB CF32M
48 MB CF48M
64 MB CF64M
80 MB CF80M
Kingston 8 MB CF/8
16 MB CF/16
24 MB CF/24
32 MB CF/32
48 MB CF/48
64 MB CF/64
96 MB CF/96
DelkinDevices Inc. 8 MB DDCFFLS2-008
16 MB DDCFFLS2-016
24 MB DDCFFLS2-024
32 MB DDCFFLS2-032
48 MB DDCFFLS2-048
64 MB DDCFFLS2-064
96 MB DDCFFLS2-096
HITACHI 8 MB HB286008C4
16 MB HB286016C4
32 MB HB289032C4
48 MB HB289048C4
64 MB HB288064C5

PRODUCT INFORMATION
Printer specifications
1-6 FS-6750
Hard disk (Microdrive)
The following hard disk is available for the printer.
Transcend 4 MB TS4MFLASHCP
8 MB TS8MFLASHCP
16 MB TS16MFLASHCP
32 MB TS32MFLASHCP
SST 8 MB SST48CF008
16 MB SST48CF016
24 MB SST48CF024
32 MB SST48CF032
48 MB SST48CF048
64 MB SST48CF064
96 MB SST48CF096
LEXAR Media 16 MB -
32 MB -
48 MB -
64 MB -
80 MB -
Table 1. 4 Recommended hard disk (Microdrive)
Manufacturer Capacity Model
IBM 340 MB DMDM-10340
512 MB DSCM-10592
1 GB DSCM-11000
Table 1. 3 Recommended Memory cards—2/2
Manufacturer Capacity Model

PRODUCT INFORMATION
Front and internal views
1-7
FS-6750
1.3 Front and internal views
Front operator panel
Feed unit release lever
Paper cassette
Paper ejection roller
Power switch
Toner bottle/drum
access door
MP tray
Feed unit release lever
Feed unit
Memory card slot

PRODUCT INFORMATION
Front and internal views
1-8 FS-6750
Internal Component
Laser scanner unit
Paper ejection roller
Upper unit ventilation fan
Liaison board
Main motor
Memory card slo
t
Regist. roller clutch
Feed roller clutch
manual feed actuator
To p c o v e r s a f e t y l o c k

PRODUCT INFORMATION
Front and internal views
1-9
FS-6750
Rear cover
Serial interface
AC power receptacle Power switch
Drum unit
Main charger
High-voltage
board
unit
YC13
Parallel interface YC02
Face-up paper
ejection slot
Laser scanner unit

PRODUCT INFORMATION
Safety information
1-10 FS-6750
1.4 Safety information
Laser caution label on the scanner unit
The laser scanner unit inside the printer has the following label affixed on its top.
Observe the laser radiation warning and figures when handling the laser scanner
unit.
Figure 1.2 Laser caution label
Warning Use of controls or adjustments or performance of procedures other
than those specified herein may result in hazardous radiation expo-
sure.
Ozone concentration
Laser printers generate ozone gas (O3) which may concentrate in the place of
installation and cause an unpleasant smell. To minimize the concentration of ozone
gas, we recommend that the laser printer not be installed in a confined area lack-
ing ventilation.

PRODUCT INFORMATION
Installation
1-11
FS-6750
1.5 Installation
Environmental requirements
Environmental conditions
Environmental conditions described in Table 1. 1 on page 3 should be observed to
ensure the optimum operation of the printer. The use of the printer in a location
which does 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 win-
dow). 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
(See Table 1. 1 on page 3). (The outlet should have a ground slot, or an adaptor
should be used. If you use an extension cord, the total length of the power cord
plus extension cord should be 17 feet or 5 meters or less.
Well ventilated, not too hot or cold, and not too damp or dry. If you install the
printer where the temperature or humidity is outside the requirements in
Table 1. 1 on page 3 in chapter 1, the best print quality may not be expected and
there will be an increased chance of paper jams.
Provide a sufficient clearances around the printer to ensure ventilation and
ease of access. See below.
Clearance
Allow the necesary minimum clearance on all sides of the printer (below).
30 cm
50 cm
25 cm
60 cm
30 cm

PRODUCT INFORMATION
Installation
1-12 FS-6750
Places to avoid
Avoid installing the printer in locations exposed to:
Direct drafts of hot or cold air.
Direct drafts of outside air. (Avoid locations next to outside doors.)
Sudden temperature or humidity changes.
Any source of high heat, such as a radiator or stove.
Excessive dust. Dust and smoke may cause contamination on the laser scanner
window, causing print quality problem.
Vibration.
Ammonia fumes or other harmful fumes. (In case of humigating the room or
saturate it with insecticide, remove the printer first.)
Avoid greenhouse-like rooms. (Because of sunlight and humidity.)
Avoid enclosed spaces that block ventilation.
Avoid sites more than 6,500 feet or 2,000 meters above sea level.
Notes on power
Use only the power source voltage conforming to the printer’s rated power volt-
age (See Table 1. 1 on page 3). Do not use other power sources.
Disconnect the printer from the power source before attempting removal or re-
placement of an electrical component or a printed-circuit board.
The printer should not be connected to a power source until the instruction is
given to do so when performing tests described in this manual.
In connecting the printer power, exercise an extreme care in handling the
power supply or any other electric parts which may give an electric shock.
Before performing maintenance or repair, power from both the power source
and the associated peripheral devices (computer, sorter, etc.) should be discon-
nected, unless otherwise specified.
To avoid possible electrical shock, extreme caution must be exercised in han-
dling the power cord and any other electrical part.
Warning As the disconnect device is not incorporated in the printer's AC pri-
mary circuit, an easily accessible socket outlet must be provided near
the equipment.

PRODUCT INFORMATION
About the toner
1-13
FS-6750
1.6 About the toner
The printer should use Kyocera TK-26/26E (for Taiwan)/CTK-45 (for Korea) Toner Kit.
To ensure the high print quality and long service life, the following handling pre-
cautions should apply.
Caution As the Ecosys printers are designed to ensure the optimum print qual-
ity when used with the Kyocera’s proprietary toner, Kyocera do not
recommend to use any refilled toner containers that may be available
commercially. This is because Kyocera have no means for control over
how such refilled toner could affect the print quality and the reliabil-
ity of the printer.
Toner container handling
To loosen and mix the toner inside, with the label side down, thoroughly shake the
toner container (in the direction of the arrow) ten times or more.
Warning Do not attempt to disassemble or refill the toner container.

PRODUCT INFORMATION
About the toner
1-14 FS-6750
Toner storage
The toner contained in the container is susceptible to temperature and humidity.
To ensure the high print quality, store the toner container in a place that satisfy the
following environmental conditions:
Note If the toner container is removed from the printerís developer unit,
put it in a protective bag and keep it in a dark place.
Caution If the printer is shipped for return, etc., do not ship it with the toner
container installed. Otherwise, toner may leak and contamination may
result in the printer.
Table 1. 5 Toner storage conditions
Temperature -20 °C to 40 °C (-4 °F to 104 °F)
Humidity 15 to 90 % RH