Mita-Kyocera FS6700 Service Manual 06

Chapter 6 TROUBLESHOOTING

Contents

6.1 Board layouts, page 6-2
Liaison board KP-620, page 6-2
Scanner interface board KP-622, page 6-3
Connect board connector/KP-616, page 6-3
Fuser board KP-505/YC-721, page 6-4

6.2 Overall wiring diagram, page 6-5

6.3 Diagnostic, page 6-6
Engine diagnostics flow, page 6-7
Logic controller diagnostics flow, page 6-8

6.4 General error handling, page 6-9
Priority, page 6-9

6.5 User-recoverable errors, page 6-11
Memory card errors, page 6-13

6.6 Service errors, page 6-15
E0—Communication error, page 6-16
E1—Main motor error, page 6-16
E2—Laser scanner motor error, page 6-21
E3 - Laser beam detection error, page 6-25
E4 - Fuser heater error, page 6-28
E5—Eraser error, page 6-30
ED—Flash ROM error, page 6-31
E9 - Toner motor error, page 6-31
F0 - Front control panel error, page 6-32
F1 - System ROM error, page 6-32
F2 - Main memory error , page 6-32
F3 - General failure , page 6-32
False error—Feed unit cover open, page 6-32

6.7 Print quality problems, page 6-37
Completely blank printout, page 6-37
All-black printout, page 6-37
Dropouts, horizontal streak, black dots, page 6-37
Black vertical streaks, page 6-38
Unsharp printing, page 6-38
Grey background, page 6-38
Dirt on the top edge or back of the paper, page 6-39
Incorrect printing registration, page 6-39
Checking cassette size sensors, page 6-40
Drum cleaning, page 6-40

6.1 Board layouts

This section explains the appearance and pin assignment for the printer boards.
The wiring information for these boards is on

Liaison board KP-620

Troubleshooting

Board layouts

6.2 Overall wiring diagram

, page 5.

Table 6. 1 KP-620 connectors

Loc.

above

1 CN8 Fan (large) —
2 CN3 Main motor E1, pin 3 (MOTOR*)/pin 1

3 CN4 Registration clutch —
4 CN1 Engine board KP616/CN14
5 CN5 Feed clutch —
6 CN7 Manual feed clutch —
7 CN9 Cassette detect switch —
8 CN2 Front panel —
9 CN6 Manual feed solenoid —

Connector Connected to: Check points

(+24V)

6-2

FS-6700

Troubleshooting

Board layouts

Scanner interface board KP-622

Table 6. 2 CN13 (Scanner CN1) pin assignment

Pin No. Signal

1+5V
2GND
3LONB
4 LASER
5VDOUT+
6VDOUT­7PD
8SCCLK
9SCRDY*
10 SCANNER*
11 GND
12 +12V

Connect board connector/KP-616

The two connectors at the right side of the printer are mounted on the connect
board. These connectors derive engine signals. For pin assignments, refer to

Overall wiring diagram

, page 5.

6.2

FS-6700

6-3

Fuser board KP-505/YC-721

18

Troubleshooting

Board layouts

12

CN13 (for laser scanner unit)

1112

12

CN14 (for KP-620 board)

1718

Table 6. 3 YC-721

Pin No. Signal

1FUPSD*
2+24V
3FDNSD*
4 PFULL*
5 THERM*
6EXITJ*
7GND
8+5V

6-4

FS-6700

Troubleshooting

Overall wiring diagram

6.2 Overall wiring diagram

S2029

TONER

SENSOR

MOTOR

S2276

THERMO CUT OUT

SENSOR

TONER

1

2

1

2

S2263

HEATER

SENSOR

SOLENOID

S2021

C

1

1

E

2

2

ZENER PWB
(KP-501)

TRANSFER ROLLER

MAG ROLLER

TONER

2

2

GND

1

1

TDRV*

2

2

+24V

1

1

S2023 S2274

AC IN

(CN1)
POWER SWITCH

(CN2)

FEED UNIT (BASE)

THERMISTER

+5V

THERM*

S2253

PAPER FULL

+5V

1

1

PAPFL*

2

2

GND

3

3

FACE

UP/DOWN

FCUP*
+24V
FDOWN*

TNFULL PWB

(KP-506)

(YC842)

(YC841)
1
2

ERASER

TONER

1

1

GND

2

2

TNRDR*

3

3

+24V

4

4

1

2

1
2
3

1
2
3

S2018

+5V

1

1

TNFULL*

2

2

TSEN*

3

3

ERASER
GND

1
2

HIGH VOLTAGE UNIT

3
4
5
6
7
8

1

1

9

2

2

10
11
12

5

5

(CN2)

13

(CN1)

6

6

14
15

MANUAL PAPER

FEED ROLLER

1

2

1
2
3

1
2
3

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15

BOX FAN
MOTOR

POWER SUPPLY UNIT

(CN5)

+24V COM

+24V COM

+24V COM

(CN2)

(KP-628)

FUSER PWB

(KP-499)

(YC741)

(YC743)

DRUM PWB

(KP-500)

(YC742)

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15

MANUAL FEED

GND

1

1

HAND*

2

2

+5V

3

3

12345
12345

+5V

12345

SENSOR PWB

(CN25)

6
6

+24V

6

(YC723)

(YC724)

(YC722)

1

1

2

2

3

3

1

1

2

2

S2266

+24V
MHVDR*
THVDR1*
CHVON*
THVDR2*
PSEL*
SPVDR1*
SPVDR2*
BIAS*
HVCLK
TONR
TNSCN
+5V
GND
TNRDR*

PAPER SENSOR

+24V COM
BFANDR

1
2

S2011

S2265

SCOVR*

1

PAPER*

2

FEEDS*

3

TNCON*

4

+24V

5

(CN1)

+24V

6

+24V

7

+24V

8

+24V

9

FCOVER*

10

TCOVR*

11

GND

12

S2252

FUPSD*

1

1

+24V

2

2

FDNSD*

(YC721)

3

3

PFULL*

4

4

THERM*

5

5

EXITJ*

6

6

GND

7

7

+5V

8

8

S2007

(YC821)

(YC822)

TSEN*

1

WTONR

2

DRUM RELAY PWB

(KP-505)

ERASE*

3

EECSEL

4

EEDAT

5

EESCLK

6

GND

7

+5V

8

30:SCANR*

60:+5V

(CN27)

123
123

+5V

HANDS*

GND

S2255

(CN6)

1
2

1

1

2

2

3

3

4

4

5

5

6

6

7

7

8

8

9

9

10

10

11

11

12

12

1

1

2

2

3

3

4

4

5

5

6

6

7

7

8

8

1

1

2

2

3

3

4

4

5

5

6

6

7

7

8

8

27:CASET0

28:GND

29:CASET1

57:+24V

58:HEAT*

59:BOXFAN*

(CN4)

GND

1

1

GND

2

2

GND

3

3

VCC

4

4

(CN15)

VCC

5

5

VCC

6

6

ZCROS

7

7

PHET

8

HEAT*

8

9

9

10

10

BOXFAN*

S2277

G2G1

ENGINE PWB (KP-614)

(CN12)

(CN21)

(CN23)

(CN24)

17:RDY*

18:PDIN*

19:VSYNC*

20:GND

21:PRINT*

22:SCNCLK

23:PDOUT*

24:GND

25:RESET*

26:SCRDY*

47:REGDR*

48:+5V

49:+24V

50:MOTOR*

51:RCOVR*

52:+5V

53:+24V

54:ZCROS

55:PHET

56:+5V

(CN27)

6

5

4

3

2

1
1

GND

10

5

4

3

2

OPSL1

OPSL2

OPSDI

OPSDO

6

7

8

9

TO OPTION UNIT

6

OPSL0

5

+5V

OPRDY*

A1 :GND
A2 :VCC
A3 :VCC
A4 :EGIR*
A5 :VSREQ*
A6 :CBSY*
A7 :SC
A8 :RDY*
A9 :NC
A10:NC
A11:FPDATA
A12:PRINT*
A13:RESET*
A14:OUTPE*
A15:GND
A16:GND
B1 :GND
B2 :VCC
B3 :VCC
B4 :NC
B5 :SBSY*
B6 :SCLK
B7 :CPRDY
B8 :CINH*
B9 :VCC
B10:NC
B11:VSYNC*
B12:PDOUT*
B13:FPCLK
B14:VDATA
B15:FPDIR
B16:GND

(CN12)

1
2

CONNECT PWB (KP-616)

3
4
5
6
7

(CN14)

8
9
10
11
12
13
14
15
16
17
18

72pin DIMM 1-SLOT (YS1)

(YC6)

S2258

GND

1

BFPCLK

2

BFPDIR

3

BFPDATA

4

+5V

5

FANDR*

6

FEDDR*

7

MPFSOL*

8

MPFCLH*

9

MTRCLK

10

REGDR*

11

MOTOR*

12

RCOVR*

13

+24V

14

+24V

15

+24V

16

GND

17

GND

18

S2261

+5V (LD)

1

1

GND

2

2

LONB*

3

3

LASER*

4

4

VIDEO+

5

5

(CN13)

VIDEO-

6

6

PDIN*

7

7

SCCLK

8

8

SCRDY*

9

9

SCANR*

10

10

GND

11

11

+24V

12

12

6 :LASER*

7 :SCLOCK

8 :GND

9 :CBSY*

10:VDOUT+

11:CPREDY

12:GND

13:SC

14:VDOUT-

15:CINH*

16:GND

36:+5V

37:+24V

38:FANDR*

39:FEDDR*

40:+5V

41:+24V

42:MPFSOL*

43:MPFCLH*

44:+5V

45:+24V

46:MTRCLK

10

9 8 7

10

9 8 7

+24V

OPSCK*

S2256

1

2 3 4

GND

CAS5

1

2

PAPER SIZE

LENGTH SW3

PC-Card

(YC3)

OPTION I/F CONNECTOR (YC1,2)

72pin PC-SIMM 2-SLOTS (YS3)

RELAY PWB (KP-620)

1

1

2

2

3

3

4

4

5

5

6

6

7

7

8

8

9

9

(CN1)

10

10

11

11

12

12

13

13

14

14

15

15

16

16

17

17

18

18

1

1

APC PWB (KP-622)

2

2

3

3

4

4

(CN1)

5

5

6

6

7

7

8

8

9

9

10

10

11

11

12

12

1 :EGIR*

2 :LONB*

3 :SBSY*

4 :GND

5 :VSREQ*

31:VDATA

32:GND

33:OUTPE*

34:CASET2

35:PPRDY

(CN28)

6
6

GND

CAS4

1

2

PAPER SIZE

LENGTH SW2

(KP-613)

S2279

(CN9)

+5V

121

CASS

2

S2259

+24V

1

1

(CN3) (CN4) (CN5) (CN6) (CN7) (CN8)

GND

2

2

MOTOR*

3

3

MMTCLK

4

4

+24V

1

1

REGDR*

2

2

+24V

1

1

FEDDR*

2

2

+24V

1

1

MPFSOL*

2

2

+24V

1

1

MPFCL*

2

2

FANCOM

121

FANDR*

2

S2260

+5V

1

1

FPDAT

2

2

+5V

(CN2)

3

3

FPDIR

4

4

GND

5

5

FPCLK

6

6

GNG

7

7

S02025

S2272
+5V

1

1

(CN3)

PDIN*

2

2

GND

3

3

S2273

SCCLK

1

1

SCRDY*

(CN2)

2

2

SCANR*

3

3

GND

4

4

+24V

5

5

12345
12345

CAS3

2
LENGTH SW1

Main Controller

1
2

S2257

GND

1
PAPER SIZE

PARALLEL I/F CONN.

(YC4) (YC5)

SERIAL I/F CONN.

CASSETTE
SWITCH

Main Motor

1

1

2

2

3

3

4

4

REGIST
CLUTCH

FEED
CLUTCH

M.FEED
SOLENOID

M.FEED
CLUTCH

FAN
MOTOR

1
2

Front Panel

(KP-503)

3
4
5
6
7

PD PWB

(KP-637)

1

1

2

2

3

3

Polygon Motor

1

1

2

2

3

3

4

4

5

5

FS-6700

6-5

6.3 Diagnostic

The printer automatically executes its self-diagnostic test when it is powered up

(displaying

below.

When the printer locates the error with a specific item, it calls for operator*s atten-

tion by showing the appropriate message on the operator panel display.

The diagnostic test is done on the following systems simultaneously:

Engine system (E errors)

•

Controller system (F errors)

•

Flowcharts on the following pages show the order and the items diagnosed in each

system.

Note Diagnostic test is cancelled if one of the user-accessible covers

Self-test

is opened during the test.

Troubleshooting

Diagnostic

). The sequence and the items to be diagnosed are explained

6-6

FS-6700

Troubleshooting

Diagnostic

Engine diagnostics flow

1

Power on

2

Engine ROM cheksum

OK?

Yes

3

Fuser thermistor OK?

The heater lamp is turned on.

Yes

The scanner polygon motor revolves.

4

Polygon motor OK?

The polygon motor stops revolving.

Yes

The main motor revolves.
The eraser array turns on.

No

No

E6 - Engine ROM error

No

9

10

E4 - Fuser error

11

E2 - Polygon motor

error

5

Eraser array OK?

Yes

The eraser array turns off.

6

Main motor OK?

Yes

7

Heater temperature

OK?

The main motor turns off.

Yes

8

Engine is ready.

No

No

No

12

E5 - Eraser error

13

E1 - Main motor error

14

E4 - Heater error

FS-6700

6-7

Logic controller diagnostics flow

1

Power on

Troubleshooting

Diagnostic

2

System ROM cheksum

OK?

Yes

3

Communication

established between

engine and main

CPUs?

Yes

4

System memory OK?

Yes

No

No

No

6

F1 - System ROM error

7

E0 - Communication

error

8

F2 - System memory

error

5

Controller is ready.

For details on how to react to the results of diagnostics, refer to section Service

errors on page 6-19.

6-8

FS-6700

Troubleshooting

General error handling

6.4 General error handling

Priority

Each error message has a priority over the others. Thus, if two or more error mes­sages are given simultaneously, the error message having the highest priority is
shown. The priority is as follows (from the highest to the lowest):

Table 6. 4 Message priority

Error message Category Remarks

Call service person F0 Service error Refer to
I/F occupied —
Top cover open User-recoverable error If not recovered, refer to
Paper feed unit open User-recoverable error If not recovered, refer to
Side cover open User-recoverable error Refer to

Opt. Feeder 1 (2) rear
cover open

Duplex unit rear cover
open

Replace Toner/Clean
printerb

Missing Waste-toner
bottle

Replace Waste-toner
bottle

Clean printer/Press
CONTINUE

Paper jamb User-recoverable error

Face-down tray paper
fill

MEMORY CARD err Insert
again

Insert the same
MEMORY CARD

Print Cancel? —

Memory overflow ...
Press CONTINUE

Print overrun ...
Press CONTINUE

KPDL error ... Press
CONTINUE

MEMORYCARD err ...
Press CONTINUE

Opt. ROM error ...
Press CONTINUE

Set paper/Press
CONTINUE

Load paper User-recoverable error
Add paper User-recoverable error

User-recoverable error with PF-25 feeder

User-recoverable error with DU-25 duplexer

User-recoverable error

User-recoverable error If not recovered, refer to

User-recoverable error

User-recoverable error

User-recoverable error

User-recoverable error

User-recoverable error

User-recoverable error

User-recoverable error

User-recoverable error

User-recoverable error

User-recoverable error

User-recoverable error

FS-6700

6-9

Table 6. 4 Message priority

Error message Category Remarks

Self test —
Sleeping —
Please wait —
PJL OPMSG/STMSG —
Processing —
Waiting —
FormFeed TimeOut —
Option interface Error User-recoverable error

Toner low TK-20/Clean
printer

Warning/Low memory -

Battery error/MEMORY
CARD

Format error/MEMORY
CARD

Warning battery/
MEMORY CARD

Ready —

Troubleshooting

General error handling

User-recoverable error

User-recoverable error

User-recoverable error

User-recoverable error

6-10

FS-6700

Troubleshooting

User-recoverable errors

6.5 User-recoverable errors

User-recoverable errors do not normally require a service call unless the suggested
remedy does not solve them. The instructions below indicate how to respond to
problems indicated by the operator panel symbolic indicators and by the panel dis­play.

Table 6. 5 User-recoverable errors

Indication Corrective action

Flashing

Lit

The printer has run low on toner. The toner should
be replaced as soon as possible.

Install a new toner kit. See chapter 1.

Fast flashing

Slow flashing

Lit

ATTENTION

Side cover Open Open the side cover, then close tightly.
Paper feed unit Open Open the paper feed unit, then close tightly.
Face-down tray paper full The face-down tray has become full (approx. 250

Add paper Add paper to the paper cassette or multi-purpose

Set paper/Press CONTINUE­CONT

Load paper papersize The paper size does not match. The size of the paper

Paper jam Open the top cover or the paper feed unit and correct

Flashing

Lit

There is a paper jam. There is a possibility that
paper may be jammed at the point indicated by
flashing, open and remove any jammed paper. See
Section

The paper has run out in the paper cassette or
multi-purpose tray. Please insert paper. See Section

This indicates either the current paper feeder or the
paper output point.

The printer has insufficient memory available or the
printer is warming up (Pleasewait). Confirm the
message indicated on the message display. See Sec­tion

Note the maintenance message on the message dis­play and consult Table

pages). Remove all printed pages from the face-down
tray. When the printer senses that the face-down
tray is empty again, it will continues printing into
the face-down tray. (Model FS-3700/+ only)

tray.
Add a sheet of paper to the multi-purpose tray (man-

ual mode), and press the CONTINUECONT key.

in the cassette is different to the size specified by the
application software or by PRESCRIBE II. Either
put paper of the specified size into the cassette. See
Section 1.4.If the CONTINUECONT key is pressed,
printing will be resumed. However, if more than one
sheet is to be printed, the same message will again
be displayed from the second sheet onward. It is also
possible to abandon printing by pressing the CAN­CEL key.

the paper jam (or paper mis-feeding in the cassette).
See Section

FS-6700

6-11

Table 6. 5 User-recoverable errors

Indication Corrective action

Warning low memory The printer’s internal memory is running low due to

Toner low TK-20/Clean
printer

Replace Toner/Clean printer Replace the toner container using a new toner kit.

Clean printer..Press CON­TINUECONT

ReplaceWaste- toner bottle Replace the old waste toner bottle with the new one

Missing Waste-toner bottle Install the waste toner bottle. See Section ... The

Memory overflow..Press CON­TINUECONT

Print overrun..Press CON­TINUECONT

MEMORY CARD err/Insertagain The memory card is accidentally removed from the

Insert the same MEMORY CARD You have inserted the wrong memory card when the

Troubleshooting

User-recoverable errors

the number of fonts and macros downloaded. Print a
status page to see how much user memory is left,
and try deleting unnecessary fonts and macros. See
the PRESCRIBE II DELF and DELM commands
explanation in the programming manual (CD-ROM).

Replace the toner container using a new toner kit.
See Section

The printer does not operate when this message is
displayed. See section

Please clean the inside of the printer. See Section
...This message will be displayed when replacing the
toner container after the message ReplaceToner­Cleanprinter has been displayed. After cleaning the
inside of the printer, press the CONTINUECONT
key and the printer will be ready for printing.

which is included in the TK-20/TK-20HTK-20G
toner kit. The message will also be shown if the
waste toner bottle has become full. The waste toner
bottle should be replaced when the message display
eventually shows TonerlowTK-20Cleanprinter. See
Section

printer does not operate when this message is dis­played.

The total amount of data received by the printer
exceeds the printer’s internal memory. Try adding
more memory (expansion RAM). Press the CONTIN­UECONT key to resume printing. You can abandon
printing by the CANCEL key.

The data transferred to the printer was too complex
to print on a page. Press the CONTINUECONT key
to resume printing. (The page may break in some
pages.)You can abandon printing by the CANCEL
key.Note: After this message has been displayed,
Page protect mode will be On. To maintain optimum
use of memory during printing, display >Pagepro­tect from the control panel, and re-select Auto.See
the printerís userís manual.

printer’s memory card slot during reading. If you
continue reading the memory card, insert the same
memory card into the slot again. The printer again
reads it from the beginning of the data.Note: We rec­ommend that you follow the reading procedure from
the beginning to ensure correct reading of the mem­ory card.

Insertagain message was displayed. Remove the
wrong memory card from the printer’s memory card
slot and insert the correct memory card. The printer
again reads it from the beginning of the data.

6-12

FS-6700

Troubleshooting

User-recoverable errors

Table 6. 5 User-recoverable errors

Format error MEMORY CARD This message appears when the printer is in the

Warning battery MEMORY CARD This message appears when the printer is in the

MEMORY CARD err/ ##..Press
CONTINUECONT

>Read fonts Failed The amount of memory available for the fonts

I/F occupied This message is displayed when you attempt to use

Processing PAR FIT A4 FIT (image FITting) flashes to indicate that a loss of

Processing PAR 600 A4ÍProcessing
PAR 300 A4

>Read fonts Failed The amount of memory available for the fonts

Indication Corrective action

ready state and the memory card is not formatted,
and therefore cannot be read or written. Follow the
procedure on Section ... to format the card.

ready state and the battery in the memory card is
low. You can still enter the memory card mode, but
the battery should be changed as soon as possible.

This message appears when an error occurs during
access to the memory card using the PRESCRIBE II
ICCD command or from the printer’s control panel
(codes 09 and 11 only). The error is indicated by one
of the numbers ## listed under the Memory card
errors which follows.

header parts of font is too small to load more fonts.
Try deleting unnecessary fonts and macros.

the printer’s control panel to change the environ­mental settings on the interface from which data are
presently being received.

raster data occurred when the data was compressed
to be fitted within the currently available memory.
Flashing FIT extinguishes automatically when the
job times out; the printer receives the next data from
the host computer; or if you press any key on the
printer’s control panel. Try adding more memory in
the printer to prevent this error.

Change of the resolution indicator from 600 to 300
(flashing) means that the job in 600-dpi resolution
was not able to run within the currently available
memory. The resolution reverts to 600 dpi automati­cally when the job times out; the printer receives the
next data from the host computer; or if you press
any key on the printer’s control panel. Try adding
more memory in the printer to prevent this error.

header parts of font is too small to load more fonts.
Try deleting unnecessary fonts and macros.

FS-6700

Memory card errors

Table 6. 6 Memory card errors

Error
code

01 SRAM Card size error (An attempt was made to write data of greater

02 SRAM No memory card inserted. Insert a proper memory card.

Applicable

card type

Meaning

than 16 MB in size.). Reduce the size of the data to be written
from the host computer to 16 MB or less; or, a file name could
not be found in the memory card.

6-13

Table 6. 6 Memory card errors

Troubleshooting

User-recoverable errors

Error
code

03 SRAM/flush Non PCMCIA card. Replace the card with a PCMCIA card.

04 SRAM Not RAM card. Use a SRAM-type card if you want to write data

05 SRAM Memory card battery error. Replace the memory card’s internal

06 SRAM Memory card protect error. Release the write protection on the

07 SRAM Non-Kyocera format. Reformat the memory card using MODE

08 SRAM Partition name error. Follow instructions given attempt in

09 SRAM Memory card data full error (An attempt was made to write

10 - Reserved

11 SRAM Data name full (An attempt was made to write more than 127

12 - Reserved

13 Flush Erase logic error with flash memory card. Try replacing the

14 - Reserved

15 Flash Non PCMCIA flush card. Replace the card with a PCMCIA

16 - Reserved

17 Flush Unable to write to the flash memory card due to insufficient

18 Flush Writing error. Try replacing the memory card.

19 - Reserved

Applicable

card type

Meaning

to an memory card.

battery with a new one.

memory card when you write data to the memory card.

SELECT (See the printerís userís manual).

Chapter 2 to properly name the destination.

data exceeding the capacity of the memory card). Abandon the
writing operation on the host computer first. Press CONTINUE
key; when the message turns to Waiting, press FORM FEED
key (Ready).

destination data names). Press CONTINUE key (Ready).

memory card.

flush card.

printer memory. Either delete unnecessary macros or fonts
stored in the printer, or extend the printer’s available memory.

For details on memory card availability, see section Printer specifications in chap-

ter 1.

6-14

FS-6700

Troubleshooting

Service errors

6.6 Service errors

Table 6. 7 Service person errors

The printer does not operate when a message beginning with E, F, or C is dis­played. The total numer of pages printed is also indicated. The message is catego­rized as follows:

Message Corrective action

Call service person
En:123456

Call service person
Fn:123456

Call service person Cn:
123456

Call service person Dn:
123456

Mechanical error (n=0, 1, 2, ...). Follow the appropriate
instructions provided in this section.

Controller error (n=0, 1, 2, ...). Follow the appropriate
instructions provided in this section.

Option equipment error (n=0, 1, 2, Ö). This message per­tains to either the sorter or duplexer. C1 through C3 are
relevant to the duplexer; C4 through C6 to the sorter.
See the service manual appropriate to the option used
with the printer.

Engine firmware download error (n=0, 1, 2, Ö). See sec­tion Updating the engine firmware in chapter 3.

FS-6700

6-15

E0—Communication error

Table 6. 8 E0 error

Communication between the

engine controller and the

main controller is failed.

E1—Main motor error

Table 6. 9 E1 error

The main motor is over-

torqued.

Troubleshooting

Service errors

Meaning Suggested causes Corrective action

• Controller gate array
defect

• Connector failure between
the engine and the main
controller

• Overrun in the engine
system, deactivating the
progam flash ROM

Meaning Suggested causes Corrective action

• Overcurrent in the main
motor circuitry due to an
axcessive torque

• Loose connector to motor

• Defective gate array on
the engine board

• No response from the
main motor due to the
defective motor driver
(transistor)

• Defective overcurrent
detector (transistor)

Verify connector connections.
Replace the engine board
and/or the main controller
board.

Follow the flow chart on page
17, Figure 6.1 and the follow­ing.

6-16

FS-6700

Troubleshooting

Service errors

Figure 6.1 E1 error

E1

(Main motor error)

Connect tester to #3

of CN1 of motor.

Turn printer power

off, then on agai.

Print a status page.

Is #3(MOTOR*) of

CN1 of motor L?

Yes

Is #1 of CN1 of motor

+24V?

Yes

Turn printer power
off, then on again.

Print a status page

No

No

Connect tester to #3

of CN3 of KP-620.

1

Turn printer power
off, then on again.
Print a status page.

Is #3 (MOTOR*)

of CN3 of KP-620

L?

Yes

Replace harness

S02259 bet. motor

and KP-620.

No

3

FS-6700

Does motor clock appear

at #4 of CN1 of motor?

Yes

2

No

Replace driver unit.

6-17

Figure 6.2 E1 error—Continued

1

Connect tester to #4

of CN3 of KP-620.

Turn printer power
off, then on again.
Print a status page.

Troubleshooting

Service errors

Does motor clock

appear at #4 of CN3

of motor?

Yes

Turn printer power

off, the on again.

Print a status page.

Does motor clock appear
at #10 of CN1 of KP-620?

Yes

Turn printer power
off, then on again.
Print a status page.

Does motor clock appear

at #10 of CN14 of

KP-616?

No

Replace harness bet.

motor and KP-620

(S02259).

No

Replace KP-620

board.

No

Yes

Connect tester bet.

#10 of CN14 of

KP-616 and #46 of

CN21 of KP-614.

Conducted?

Yes

Replace KP-614.

No

6-18

Replace harness bet.

KP-620 and KP-616.

Replace KP-616

board.

FS-6700

Troubleshooting

Service errors

Figure 6.3 E1 error—Continued

2

Connect tester to #1 of

CN3 of KP-620.

Is #1 of CN3 of KP-620

+24V?

Yes

Replace harness bet.

main and KP-620.

No

Is volt. bet. #14 and #16 of

CN1 of KP-620 +24V?

Yes

Replace KP-620.

No

Connect tester bet. #14

and #16 of CN14 of

KP-616.

Is volt. bet. #14 and #16 of

CN14 of KP-616 +24V?

No

Yes

Replace harness bet.

KP-620 and KP-616.

Is volt. bet. #5 and #9 of

CN22 of KP-614 +24V?

Yes

Connect tester bet.
#14-16 of CN 14 of

KP-616 and either pin of

37, 41, 45, 49, 53, and

57 of CN21 of KP-614.

Conducted?

Yes

Replace KP-614.

No

Replace KP-628.

No

Replace KP-616.

FS-6700

6-19

Figure 6.4 E1 error—End

3

Turn printer power off,

then on again. Print a

status page.

Troubleshooting

Service errors

Is #12 of CN1 of KP-620

?

Yes

Replace KP-620.

No

Turn printer power off,

then on again. Print a

status page.

Is #12 of CN14 of KP-616

?

Yes

Replace harness bet.

KP-620 and KP-616.

No

Connect tester #12 of

CN14 of KP-616 and

#50 of CN21 of KP-614.

Conducted?

No

6-20

Yes

Replace KP-616.Replace KP-614.

FS-6700

Troubleshooting

Service errors

Table 6. 10 E2 error

E2—Laser scanner motor error

Meaning Suggested causes Corrective action

The polygon motor does not
deliver a synchronous output
(L) within the predetermined
period of time.

• Timeout in the predeter­mined period of lead time
which the scanner motor
speed has to be reached at
start up (SCRDY*)

• Connector insertion error

• Defective gate array on
the engine board

• Time out dur to the defec­tive scanner motor driver
(transistor)

Follow the flow chart on the
next page.

FS-6700

6-21

Figure 6.5 E2 error

E2

(Scanner motor

error)

Connect tester to #10

of CN1 of KP-622.

Troubleshooting

Service errors

Is #10 (SCANR*)

of CN1 of

KP-622 L?

Yes

Turn printer power

off, then on again.
Print a status page.

Does clock

appear at #8 of

CN1 of KP-622?

Yes

Connect tester to #10

No

No

of CN13 of KP-616.

Turn printer

power off, then

on again. Print a

status page.

Turn printer power

off, then on again.

Is #10 of

CN13 of

KP-616 ?

Yes

No

3

1

Does clock

appear at #8 of

CN13 of KP-616?

Yes

Replace harness bet.

KP-616 and scanner

unit.

6-22

No

2

FS-6700

Troubleshooting

Service errors

Figure 6.6 E2 error—Continued

1

Is #12 of CN1 of

KP-622 +24V?

Yes

Turn printer power off,

then on again. Print a

status page.

Is #9 of CN1 of

KP-622 low?

Yes

Turn printer power off,

then on again. Print a

status page.

Is #9 of CN13 of

KP-616 low?

No

No

No

Replace laser

scanner unit.

Are #14-16 of CN14

of KP-616 +24V?

Yes

No

Are #14-16 of CN14

of KP-616 +24V?

Yes

Connect tester bet.

#14-16 of CN14 of KP-616

and either of 37, 41, 45,

49, 53, and 57 of KP-614.

No

Repplace KP-628.

Yes

Connect tester to #9

of CN13 of KP-616

and #26 of CN21 of

KP-614.

Conducted?

Yes

Replace KP-614.

Replace harness bet.

KP-616 and laser

No

scanner unit.

Replace KP-616.

Conducted?

Yes

No

FS-6700

6-23

Figure 6.7 E2 error—End

Troubleshooting

Service errors

2

Connect tester bet. #8

of CN13 of KP-616 and

#22 of CN21 of

KP-614.

Conducted?

Yes

No

3

Connect tester bet.

#10 of CN13 of KP-616

and #30 of CN21 of

KP-614.

Conducted?

Yes

No

Replace KP-614.

Replace KP-616.

6-24

FS-6700

Troubleshooting

Service errors

Table 6. 11

E3 - Laser beam detection error

Meaning Suggested causes Corrective action

Beam detection is failed. The
photo detector board does not
deliver a synchronous output
(L).

• No beam hit due to the
laser diode defect (PD*)

• Improper connector inser­tion

• Soiled/defective beam
detector (pin-photo diode)
sensor

• Defective safety lock

• Unoperative gate array
input port

Follow the flow chart on the
next page.

FS-6700

6-25

Figure 6.8 E3 error

E3

(Scanner beam

detector error)

Connect tester to #4 of

CN1 of KP-622.

Turn printer power

off, then on again.

Troubleshooting

Service errors

Is #4 (LASER) of CN1

of KP-622 low?

Yes

Turn printer power

off, then on again.

Does low-level pulse

appear at #7 (PD) of CN1

of KP-622?

Yes

Turn printer power
off, then on again.

Print a status page.

No

No

Connect tester to

#4 of CN13 of

KP-616.

Replace laser

scanner unit.

Turn printer power

off, then on again.

Is #4 of CN13 of KP-616

low?

Yes

No

2

Yes

Does low-level pulse

appear at #7 of CN13 of

KP-616?

Yes

No

Replace harness bet.

KP-616 and laser

scanner unit.

6-26

FS-6700

Troubleshooting

Service errors

Figure 6.9 E3 error—Continued

1

Connect tester #7 of

CN13 of KP-616

and #18 of CN21 of

KP-614.

Conducted?

Yes

No

2

Connect tester to #4

of CN13 of KP-616

and #6 of CN21 of

KP-614.

Conducted?

Yes

No

Replace KP-614.

Replace KP-616.

FS-6700

6-27

E4 - Fuser heater error

Table 6. 12 E4 error

The fuser heater is not intact
due to disconnection or the
circuit failure.

Troubleshooting

Service errors

Meaning Suggested causes Corrective action

• Blown-out thermistor

• Improper connector inser-

tion

• Blown-out halogen heater

• Blown-out thermostat

• Comparator defect on the

engine board

• Defective engine CPU

(input port)

• Defective gate array

(input/output port opera­tion)

Follow the flow chart on the
next page.

6-28

FS-6700

Troubleshooting

Service errors

Figure 6.10 E4 error

(Fuser heater error)

immediately after

E4

"E4" shown

No

power up?

Yes

Turn printer power off

and remove power

cable.

Measure DC resistance

between #5 and #8 of

YC721 on KP-499

(fuser) board.

Less than 1MΩ?

Yes

No

Replace fuser

unit.

Replace

fuser unit.

Measure fuser

roller

temperature.

180-220°C?

Yes

End

No

Replace KP-614 board. If
not solved, replace power

supply.

FS-6700

Replace KP-614 board. If not

solved, replace harness between

KP-499 and KP-614 boards.

6-29

E5—Eraser error

Table 6. 13 E5 error

The eraser is blown out or the
power supply does not reach
to the eraser.

Figure 6.11 E5 error

Troubleshooting

Service errors

Meaning Suggested causes Corrective action

• Blown-out LED chip(s)

• Connector insertion error

• Defective gate array

(input/output port)

E5

[Eraser error]

Take the drum

unit out.

Follow the flow chart on the
next page.

Measure resistance

between #1 and #3

of YC741 on KP-500.

Infinity?

Yes

Replaceeraser (drum unit).

If not recovered, replace

KP-500.

No

Replace harness between

KP-614 and KP-505. If not

recovered, replace KP-505.

6-30

FS-6700

Troubleshooting

Service errors

Table 6. 14 ED error

Table 6. 15 E9 error

ED—Flash ROM error

Meaning Suggested causes Corrective action

Checksum is erroneous with
the flash ROM.

E9 - Toner motor error

Meaning Suggested causes Corrective action

The toner motor is over­torqued.

• Data readout error on the
flash ROM

• Overcurrent in the toner
motor circuitry due to an
axcessive torque

•Loose connector

• Defective gate array on
the engine board

• Defective toner motor
overcurrent detector

Replace the engine board.

Follow the flow chart on the
next page.

Figure 6.12 E9 error

E9

(Toner motor

error)

Replace with a
new developer

unit.

E9 goes

off?

Yes

END

No

Replace KP-614

board.

FS-6700

6-31

F0 - Front control panel error

Table 6. 16 F0 error

Communication is failed
between the front panel and
the main controller.

F1 - System ROM error

Table 6. 17 F1 error

Checksum is failed with
EPROMs on the main con­troller board.

F2 - Main memory error

Table 6. 18 F2 error

Troubleshooting

Service errors

Meaning Suggested causes Corrective action

• — Replace the main controller

board. To remove the main
controller board, see page 2-9.

Meaning Suggested causes Corrective action

• - Replace the main controller

board. To remove the main
controller board, see page 2-9.

Checksum is failed with the
RAM on the main controller
board.

F3 - General failure

Table 6. 19 F3 error

Miscellaneous failure with
the main controller, other
than F0, F1, and F3, above.

False error—Feed unit cover open

Meaning Suggested causes Corrective action

• - Replace the main controller

board. To remove the main
controller board, see page 2-9.

Meaning Suggested causes Corrective action

• - Turn printer power off, then

on again. If not solved,
replace the main controller
board. To remove the main
controller board, see page 2-9.

6-32

FS-6700

Troubleshooting

Service errors

Figure 6.13 False error—Feed unit cover open

False error

[Feed unit cover

open]

Connect tester to #10 of

CN1 on KP-628.

Is #10

(FCOVER) low?

Yes

Connect tester to #10

of CN22 on KP-614.

Is #10 low?

Yes

Replace KP-614.

No

Replace KP-614

board.

No

Replace KP-628.

FS-6700

6-33

Figure 6.14 Falser error—Top cover open

False error

[Top cover

open]

Is #11 (TCOVER)
of CN1 on KP-628

low?

Troubleshooting

Service errors

No

Yes

Connect tester to #11

of CN22 on KP-614.

Is #11

low?

Yes

Replace KP-614.

Replace KP-628

board.

No

Replace KP-628.

6-34

FS-6700

Troubleshooting

Service errors

Figure 6.15 False error—Side cover open

False error

[Side cover

open]

Is #1 (SCOVER)

of CN1 on KP-628

low?

No

Yes

Connect tester to #1 of

CN22 on KP-614.

Is #1 low?

Yes

Replace KP-614.

Replace KP-628

board.

No

Replace KP-628.

FS-6700

6-35

Figure 6.16 False error—Missing waste toner bottle

False error

[Missing waste

toner bottle]

Is #4 (TNCON*)

of CN1 on KP-628

low?

Troubleshooting

Service errors

No

Yes

Connect tester to #4 of

CN22 on KP-614.

Is #4 low?

Yes

Replace KP-614.

Replace KP-628

board.

No

Replace KP-628.

6-36

FS-6700

Troubleshooting

Print quality problems

6.7 Print quality problems

Print quality problems range from uneven tone to completely blank output. The
troubleshooting procedure for each type of problem is given below.

Completely blank printout

Checkpoint Suggested remedy

Check the developer unit. • Check that the developer unit is inserted correctly

All-black printout

Check point Suggested remedy

Check the main charger unit
installation.

• Check that the developer ’s connector is connected prop­erly.

• Open the printer side cover and check that the main
charger unit is correctly seated. To do this, take out the
main charger unit from the printer; then reinstall it care­fully.

Dropouts, horizontal streak, black dots

Check point Suggested remedy

Clean the main charger. • Open the side (drum access) cover. Pull out the green

knob on the main charger. Pull and push in several

Note the spacing of the
defects. Use the Repetitive
defect gauge on page6-43.

times. For details, see page 5,

printer

• If the defects occur at regular intervals of 60.6 mm, the
problem may be a dirty transfer roller. Clean or replace
the tranfer roller.

• If the defects occur at regular intervals of 125.6 mm, the
problem may be a damaged drum unit or fuser roller.
Replace the drum unit or fuser unit accordingly.

• If the defects occur at regular intervals of 39.3 mm, the
problem may be a damaged developing roller. Replace
the developer unit, if necessary (page 9,

developer unit

.

).

3.3. Cleaning the

Removing the

FS-6700

6-37

Black vertical streaks

Check point Suggested remedy

Check the front display for
indication of “Toner low.”

Contaminated main charger
wire.

Unsharp printing

Troubleshooting

Print quality problems

• If the display shows that the toner is running out,

replace the toner container with a new one. See page 3,

Toner container replacement

• Clean the main charger wire by pulling the green colored

cleaning knob in and out several times.

.

Check point Suggested remedy

Check the front display for
indication of “Toner low.”

Check the print density set­ting.

Check the paper thickness
setting.

Check Ecoprint setting • Turn Ecoprint for normal density printing.
The surface of the drum is

contaminated.

• If the display shows that the toner is running out,

replace the toner container with a new one. See page 3,

Toner container replacement

• Operate the operator panel to see if the print density set-

ting is adequate.

• If thick paper is used, try changing the paper thickness

setting. See page 15,

for thick paper

• See ...

3.7. Adjusting the transfer bias

.

.

Grey background

6-38

FS-6700

Troubleshooting

Print quality problems

Check point Suggested remedy

Check the front display for
indication of “Toner low.”

Check the main charger unit
installation.

Clean the main charger. • Clean the main charger wire by pulling the green colored

Dirt on the top edge or back of the paper

• If the display shows that the toner is running out,
replace the toner container with a new one. See page 3,

Toner container replacement

• Open the printer side cover and check that the main
charger unit is correctly seated. To do this, take out the
main charger unit from the printer; then reinstall it care­fully.

cleaning knob in and out several times.

.

Check point Suggested remedy

Check toner contamination in
various parts.

Check the transfer roller. • If the transfer roller is contaminated with toner, clean

• Dirty edges and back of the paper can be caused by toner
accummulated on such parts as the paper chute, paper
transportation paths, the bottom of the developer unit,
and the fuser inlet. Clean these areas and parts to
remove toner.

the transfer roller using a vacuum cleaner; or by continu­ously printing a low-density page until the symptom has
faded away.

Incorrect printing registration

Check point Suggested remedy

Wrong application manipula­tion

Check the paper size sensor
in the paper cassette.

• Check driver setting. If using Prescribe commands,
review that the proper syntax is followed.

• Check switches on KP-614 and KP-616 boards. Refer to
the following section.

FS-6700

6-39

Checking cassette size sensors

The printer tells the size of paper (cassette) to be fed by means of sensors on the
KP-614 and KP-616 boards. These sensors (switches) are activated by the pushing
pegs on paper cassettes in different paper sizes. If the sensors are not correctly
activated in a correct matrix of activation, paper jam or printing defects like above
may occur.

Figure 6.17 Cassette size sensors

Troubleshooting

Print quality problems

6 (Letter)

Table 6. 20 Papser size matrix

Paper size

A4L Off Off On Off Off On
Letter L Off On On Off Off On
B5 On Off Off Off Off Off
Legal size On On Off Off Off Off
A5 OffOffOffOffOffOn
B4 On Off On Off Off Off
A3 Off Off On Off Off Off
Ledger Off On On Off Off Off

No cassette

4

5

6 (A4)

123

Front side

Switch ID (See above.)

➊➋➌➍➎➏

OffOffOffOffOffOff

Controller
box top cover

Drum cleaning

This mode is meant to provide a manual means of drum cleaning in additioin to the
regular cleaning procedure made automatically in a photographics cycle. In this
mode, the drum turns for the period of approximately three minutes with no main
charging dispersed over the drum. Since the cleaning blade in the drum continu­ously attempt to scrape soils and paper dust on its surface, the drum can be
brought in a clean state.

6-40

FS-6700

Troubleshooting

Print quality problems

To clean the drum using this feature, peform the following:

Press

1

Press + repeatedly until

2

Press >.

3

Press + repeatedly until

4

Press >. The display should show

5

Press + the display should show

6

Press

7

Press

8

.

MODE

Others>

>Service>

. The display should show “?.”

ENTER

. The drum then starts turning and stops after approx. 3 minutes.

ENTER

is indicated.

is indicated.

>>Developer

>>Drum

.

.

The printer reverts to

Ready

.

FS-6700

6-41

This page left blank intentionally

Troubleshooting

Print quality problems

6-42

FS-6700