Konica 7920 Wiring Diagram 7920fv3e

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

TROUBLESHOOTING

18605

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

CONTENTS

1. INTRODUCTION .............................................................................................T-1

1-1. Reading the Text .....................................................................................T-1

2. I/O CHECK ......................................................................................................T-1

2-1. Electrical Components Check Procedure ................................................T-1

2-2. I/O Check List ..........................................................................................T-3

2-3. How to Interpret “State Confirm” of “Tech. Rep. Mode” ........................... T-9

(1) Table # .............................................................................................T-9

(2) Level History 1 ............................................................................ .....T-10

(3) Level History 2 ............................................................................ .....T-10

2-4. Paper Misfeed ..........................................................................................T-11

2-5. Misfeed Detecting Sensor Layout ............................................................T-12

2-6. Types of Misfeed Detection and Detection Timing ..................................T-14

2-7. Misfeed Troubleshooting Procedures ......................................................T-17

(1) Copier Paper Take-Up Misfeed . ......................................................T-17

(2) Manual Bypass Take-Up Misfeed ....................................................T-19

(3) Copier Vertical Transport Misfeed ...................................................T-22

(4) 2nd Image Transfer Misfeed ............................................................T-25

(5) Exit Misfeed .......................................... ................... ................... .....T-27

(6) PF-231 Paper Take-Up Misfeed ......................................................T-29

(7) DB-431 Paper Take-Up Misfeed .....................................................T-32

(8) AD-231 Paper Take-Up Misfeed .....................................................T-35

3. MALFUNCTIONS ............................................................................................T-37

3-1. Detection Timing by Warning Code .........................................................T-38

3-2. Detection Timing by Malfunction Code ....................................................T-4 0

3-3. Troubleshooting Procedures by Malfunction Code ..................................T-48

(1) C0000: Main Motor’s failur e to tu rn

C0001: Main Motor turning at abnormal timing ...............................T-4 8

(2) C0010: Imaging Unit Motor C’s failure to turn

C0011: Imaging Unit Motor C turning at abnormal timing
C0012: Imaging Unit Motor M’s failure to turn
C0013: Imaging Unit Motor M turning at abnormal timing
C0014: Imaging Unit Motor Y’s failure to turn
C0015: Imaging Unit Motor Y turning at abnormal timing
C0016: Imaging Unit Motor Bk’s failu r e to tu r n

C0017: Imaging Unit Motor Bk turning at abnormal timing ..............T-49

(3) C0040: Fusing Cooling Fan Motor 1’s failure to tu r n

C0046: Fusing Cooling Fan Motor 2’s failure to tu rn
C004C: Ozone Ventilation Fan Motor’s failure to tur n

C004E: Power Supply Cooling Fan Motor’s failure to turn ..............T-51

(4) C0060: Fusing Drive Motor’s failure to turn

C0061: Fusing Drive Motor turning at abnormal timing ...................T-53

(5) C0094: 2nd Image Transfer Roller pressure/retraction failure ........T-54

(6) C0096: Image Transfer Belt pressure/retraction failure ...................T-55

(7) C0098: Fusing Roller pressure/retraction failure .............................T-56

(8) C0200: Cyan PC Drum Charge Corona malfunction

C0202: Magenta PC Drum Charge Corona malfunction

i

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

C0204: Yellow PC Drum Charge Corona malfunction

C0206: Black PC Drum Charge Corona malfunction ......................T-58

(9) C0400: Exposure Lamp’s failure to turn ON

C0410: Exposure Lamp turning ON at abnormal timing ..................T-60

(10) C0500: Heating Roller warm-up failure

C0501: Lower Fusing Roller Heater Lamp warm-up failure

C0510: Heating Roller abnormally low temperature

C0511: Lower Fusing Roller Heater Lamp abnormally low temperature

C0520: Heating Roller abnormally high temperature

C0521: Lower Fusing Roller Heater Lamp abnormally high

temperature .....................................................................................T-61

(11) C0650: Scanner Home Sensor malfunction

C0660: Scanner overrun failure .......................................................T-63

(12) C0990: LCC Lift-Up Motor malfunction

C0991: LCC Lift 1 ascent motion failure

C0995: LCC Transport Motor malfunction

C0999: LCC Lift 2 ascent motion failure ..........................................T-65

(13) C0F30: Abnormally low toner density detected by Cyan ATDC Sensor/

C0F31: Abnormally high toner density detected by Cyan ATDC Sensor

C0F32: Abnormally low toner density detected by Magenta ATDC Sensor/

C0F33: Abnormally high toner density detected by Magenta ATDC Sensor

C0F34: Abnormally low toner density detected by Yellow ATDC Sensor/

C0F35: Abnormally high toner density detected by Yellow ATDC

Sensor .............................................................................................T-67

(14) C0F36: Abnormally low toner density detected by Black ATDC Sensor/

C0F37: Abnormally high toner density detected by Black ATDC

Sensor .............................................................................................T-69

(15) C0F3A: Cyan ATDC Sensor adjustment failure

C0F3B: Magenta ATDC Sensor adjustment failure

C0F3C: Yellow ATDC Sensor adjustment failure

C0F3D: Black ATDC Sensor adjustment failure .............................. T-70

(16) C13C8: New Transfer Belt Unit resetting failure

C13CA: New Fusing Unit resetting failure

C13CB: New Fusing Web Unit resetting failure

C13CC: New Oil Coating Unit resetting failure ................................T-71

(17) C13D1: Cyan IU EEPROM failure

C13D2: Magenta IU EEPROM failure

C13D3: Yellow IU EEPROM failure

C13D4: Black IU EEPROM failure ....................... ........................... .T-72

(18) C3310: CCD clamp/gain adjustment failure ....................................T-73

(19) C3700: IR Cooling Fan Motor 1 turning at abnormal timing

C3710: IR Cooling Fan Motor 2 turning at abnormal timing

C3720: Original Glass Cooling Fan Motor turning at abnormal

timing .............................................................................................T-74

(20) C3A00: PIC communication error

C3A01: PIC Board malfunction

C3FFF: ROM contents fault detected upon start .............................T-75

ii

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

3-4. Power Supply-Related Malfunctions ........................................................T-76

(1) Copier Does not Turned ON. ................................. ..........................T-76

(2) No Control Panel Indicators Light up. ..............................................T-77

(3) No Power is Supplied to Options. ............................................. .... ...T-78

4. IMAGE QUALITY PROBLEMS ........................................................................T-79

4-1. Troubleshooting Image Quality Problems ................................................T-79

4-2. Initial Check Items ...................................................................................T-79

4-3. Troubleshooting Procedure by a Particular Image Quality Problem ........T-82

(1) IR Scanner System: white lines in FD, white bands in FD,

colored lines in FD, and colored bands in FD ..................................T-82

(2) IR Scanner System: white lines in CD, white bands in CD,

colored lines in CD, and colored bands in CD .................................T-83

(3) IR Scanner System: color spots ......................................................T-84

(4) IR Scanner System: fog ...................................................................T-85

(5) IR Scanner System: blurred image, blotchy image .........................T-87

(6) IR Scanner System: incorrect color image registration ...................T-88

(7) IR Scanner System: moire ............................................................... T-89

(8) IR Scanner System: skewed image .................................................T-90

(9) IR Scanner System: distorted image ...............................................T-91

(10) IR Scanner System: low image density, rough image .....................T-92

(11) IR Scanner System: defective ACS .................................................T-93

(12) IR Control System: blank copy, black copy .....................................T-94

(13) IR Control System: abnormal image ................................................ T-95

(14) Printer Monocolor: white lines in FD, white bands in FD,

colored lines in FD, colored bands in FD, white lines in CD,

white bands in CD, colored lines in CD, colored bands in CD .........T-96

(15) Printer Monocolor: uneven density in FD ........................................T-98

(16) Printer Monocolor: uneven density in CD ........................................T-100

(17) Printer Monocolor: low image density ..............................................T-101

(18) Printer Monocolor: gradation reproduction failure ...........................T-103

(19) Printer Monocolor: foggy background ..............................................T-105

(20) Printer Monocolor: void areas, white spots ......................................T-107

(21) Printer Monocolor: colored spots .....................................................T-108

(22) Printer Monocolor: blurred image ...................... .. .... .... ......... .. .... .... .T-109

(23) Printer Monocolor: blank copy, black copy .......... ...... .... ............. .....T-110

(24) Printer Monocolor: 0.5-mm-pitch uneven image ..............................T-111

(25) Printer Monocolor: 2-mm-pitch uneven image .................................T-112

(26) Printer Monocolor: 94-mm-pitch uneven image ...............................T-113

(27) Printer 4-Color: white lines in FD, white bands in FD,

colored lines in FD, and colored bands in FD ..................................T-114

(28) Printer 4-Color: white lines in CD, white bands in CD,

colored lines in CD, and colored bands in CD .................................T-116

(29) Printer 4-Color: uneven density in FD .............................................T-118

(30) Printer 4-Color: uneven density in CD .............................................T-119

(31) Printer 4-Color: low image density ...................................................T-120

(32) Printer 4-Color: poor color reproduction ..........................................T-122

(33) Printer 4-Color: incorrect color image registration ...........................T-124

iii

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(34) Pr in ter 4-Color: void areas, white spots ...........................................T-126

(35) Printer 4-Color: colored spots ..........................................................T-127

(36) Printer 4-Color: oil lines, oil on copy ................................................T-129

(37) Printer 4-Color: poor fusing performance, offset .............................T-130

(38) Printer 4-Color: brush effect, blurred image ....................................T-131

(39) Printer 4-Color: back marking ..........................................................T-132

(40) Printer 4-Color: 75-mm-pitch uneven image, 200-mm-pitch

uneven image .................................................................................. T-133

(41) Printer 4-Color: 94-mm-pitch uneven image ....................................T-134

4-4. Image Stabilizer Malfunction .............................................. ......................T-135

(1) P-5: AIDC Sensor Failure (AIDC Sensor 2)

P-28: AIDC Sensor Failure (AIDC Sensor 1) ...................................T-135

(2) P-6: Cyan Imaging Unit Failure

P-7: Magenta Imaging Unit Failure

P-8: Yellow Imaging Unit Failure

P-9: Black Imaging Unit Failur e .................................................. .....T-135

(3) P-21 : Co l o r Sh i ft Correction Fai l u re ( T e s t P a tt e rn Fa i l u r e ) .......... .. .. T-136

(4) P-22: Color Shift Correction Failure

(Correction Amount Failure) ............................................................T-136

(5) P-23: Cyan 1st Image Transfer ATVC Failure

P-24: Magenta 1st Image Transfer ATVC Failure

P-25: Yellow 1st Image Transfer ATVC Failure

P-26: Black 1st Image Transfer ATVC Failure

P-27: 2nd Image Transfer ATVC Failure .........................................T-136

(6) S-1: CCD Gain Adjustment Failure ....................................... ...........T-137

(7) S-2: Intensity Adjustment Failure .....................................................T-137

iv

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

1. INTRODUCTION

1-1. Reading the Text

1. The paper transport failure troubleshooting procedures are given according to the
symptom. First identify the location where the paper is present and start the procedure
for that particular location. For malfunction troubleshooting, start with step 1 and
onward.

2. Make checks in the numerical order of steps and, if an item is checked okay, go to the
next step.

Pattern 1

Step Check Result Action

1 Is ..? YES Do this.
2

Go to step 2 if you answered No.

Pattern 2

Step Check Result Action

1 Is ..? YES Do this.

NO Check that.

2

Go to step 2 if it is checked okay.

2. I/O CHECK

2-1. Electrical Components Check Procedure

To allow the Tech. Rep. to easily and safely determine whether a particular electrical com­ponent is fully operational, this copier provides the following provision. Checking the data of
the input port of the board IC with the copier in the standby state (including a misfeed, mal­function, and closure failure condition) allows the Tech. Rep. to determine whether signals
are properly input to an electrical component.

<Procedure>

1. When a misfeed or malfunction occurs, identify on the circuit diagram accompanying
the text the electrical component that is probably responsible for the problem.

2. Select “State Confirm” from the “Tech. Rep. Mode” menu and then select “I/O Check.”
Then, from among the Sensors 1 to 7 screens, select the screen that contains the elec­trical component picked out in step 1 above. (See “Tech. Rep. Mode” contained in
SWITCHES ON PWBs.)

3. Check the input data to determine if the signal is correctly input.

T-1

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

<Electrical Component Check Procedure Through Checking Input Data>

Example

When a paper misfeed occurs in the paper take-up section of the copier, the 2nd Drawer
Paper Take-Up Sensor is considered to be responsible for it.
<Procedure>

1. Remove the sheet of paper misfed.

2. From the I/O Check List that follows, it is known that the input signal of the 2nd Drawer
Paper Take-Up Sensor may be checked with the data of “Take-Up” of “2nd Drawer.”

3. From the “Tech. Rep. Mode” menu, select “State Confirm” and then “I/O Check.” Then,
select the screen that contains “Take-Up” under “2nd Drawer.”

4. Check that the data for “Take-Up” under “2nd Drawer” is “0” (sensor blocked).

5. Move the actuator to unblock the 2nd Drawer Paper Take-Up Sensor.

6. Check that the data for “Take-up” under “2nd Drawer” changes from “0” to “1” on the
screen.

1: Sensor is operational. 0: Sensor is faulty.

T-2

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

2-2. I/O Check List

<I/O Check Screens>

• These are only typical screens which may be different from what are shown on each indi-

vidual copier.

Previous

Screen

Next

Screen

4004P047CA 4004P048CA

Previous

Screen

Next

Screen

4004P053CA

Next

Screen

Next

Screen

Next

Screen

Next

Screen

Previous

Screen

4004P049CA

Previous

Screen

4004P050CA

Previous

Screen

Previous

Screen

T-3

4004P051CA4004P052CA

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

<I/O Check List>

Operation Characteris-

Symbol Panel Display Part/Signal Name

PC3 1st Drawer Set 1st Drawer Set

PC6 Paper

PC4 Paper Near

PC13 Double

SW D 2nd

Drawer

PC102 Paper

PC103 Paper Near

PC101 Take-Up 2nd Drawer Paper

PC105 Double

SW D 3rd Drawer Set Drawer Set Switch In position Out of

PC2 Paper

PC3 Paper Near

PC1 Take-Up Drawer Paper Take-

PC5 Double

SW D 4th Drawer Set Drawer Set Switch In position Out of

PC2 Paper

PC3 Paper Near

PC1 Take-Up Drawer Paper Take-

PC5 Double

PC15 Manual Take-Up Manual Feed Paper

PC15 Set Manual Feed Paper

PC17 Paper

Passage

PC10 Exit Exit Sensor Paper

PC19 Paper

Passage

OHP Detect

Sensor
1st Drawer Paper

Empty

Empty Sensor
1st Drawer Paper

Empty

Near-Empty Sensor
1st Drawer Double

Feed

Feed Sensor

Set 2nd Drawer Set

Switch
2nd Drawer Paper

Empty

Empty Sensor
2nd Drawer Paper

Empty

Near-Empty Sensor

Take-Up Sensor
2nd Drawer Double

Feed

Feed Sensor

Drawer Paper Empty

Empty

Sensor
Drawer Paper Near-

Empty

Empty Sensor

Up Sensor
Drawer Double Feed

Feed

Sensor

Drawer Paper Empty

Empty

Sensor
Drawer Paper Near-

Empty

Empty Sensor

Up Sensor
Drawer Double Feed

Feed

Sensor

Take-Up Sensor

Take-Up Sensor

Timing

Synchronizing Roller

Roller

Sensor

OHP Detecting

Sensor

Sensor

tics/Panel Display

10

In position Out of

Paper not

present
Blocked Unblocked IC6 PG0 PJ17I-6A

present

In position Out of

Paper not

present
Blocked Unblocked IC1 PB6 PJ3A-11A

present

present

Paper not

present
Blocked Unblocked IC1 PB6 PJ3A-11A

present

present

Paper not

present
Blocked Unblocked IC1 PB6 PJ3A-11A

present

present

present

In position Out of

present

present

present

Paper

Paper

Paper

Paper

Paper

Paper

Paper

Paper

Paper

OHP

position

Paper

present

Paper not

present

position

Paper

present

Paper not

present

Paper not

present

position

Paper

present

Paper not

present

Paper not

present

position

Paper

present

Paper not

present

Paper not

present

Paper not

present

position

Paper not

present

Paper not

present

OHP not

present

Input

Board

Master

Board

(PWB-I)

Control

Board

(PWB-A)

Control

Board

(PWB-A)

Control

Board

(PWB-A)

Master

Board

(PWB-I)

IC

Port

No.

CN/PJ

No.

10B

No.

IC6 PG1 PJ17I-9A

IC5 PI7 PJ3I-8A

IC6 PI0 PJ5I-8B

IC1 PC0 PJ3A-4B

IC1 PB5 PJ3A-14A

IC1 PB7 PJ3A-5A

IC1 PC3 PJ3A-8A

IC1 PC0 PJ3A-4B

IC1 PB5 PJ3A-14A

IC1 PB7 PJ3A-5A

IC1 PC3 PJ3A-8A

IC1 PC0 PJ3A-4B

IC1 PB5 PJ3A-14A

IC1 PB7 PJ3A-5A

IC1 PC3 PJ3A-8A

IC6 PI5 PJ15I-7B

IC5 PH4 PJ15I-

IC1 P77 PJ14I-9B

IC6 PI4 PJ3I-14A

IC1 AN5 PJ14-2B

T-4

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

Operation Characteris-

Symbol Panel Display Part/Signal Name

LS1 LCC Lift-Up 1 Lift-Up Sensor 1 At raised

LS2 Lift-Up 2 Lift-Up Sensor 2 At raised

RSEN Registration Registration Sensor Paper

S1 Paper Wait Paper Standby

PPS0 Take-Up 1 LCC Paper Take-Up

PPS1 Take-Up 2 Paper Empty Sensor 1Paper

EMP Paper

RS1 Paper Near

RS2 Paper Near

PWB-A

Duplex Set Duplex Unit Door Set

PI2

PWB-A

PI1

PC1 Paper

PC1 Horizontal

Trans. Unit

PC6 Rev. Empty Turnover Empty

PWB-B Mail Bin

PWB-B 1st bin

PWB-D 2nd bin

PWB-D 3rd bin

PWB-D 4th bin

PWB-D 5th bin

PWB-D 6th bin

PWB-D 7th bin

PWB-D 8th bin

PWB-D 9th bin

PWB-D 10th bin

Sorter

Empty 1

Empty 2

passage 1

passage 2
Horizontal

Transport

Position Sensor

Sensor

Paper Empty Sensor 2Paper not

Empty

Paper Near Empty
Sensor 1

Paper Near Empty
Sensor 2

Sensor (in PWB-A)

Paper

Duplex Unit
Transport Sensor 1
(in PWB-A)

Duplex Unit
Transport Sensor 2

Paper Sensor Paper not

Detecting Sensor

Exit

Exit Sensor Board Paper

Section

Non-Sort Bin Empty

Empty

Sensor
2nd Bin Empty

Empty

Sensor
3rd Bin Empty

Empty

Sensor
4th Bin Empty

Empty

Sensor
5th Bin Empty

Empty

Sensor
6th Bin Empty

Empty

Sensor
7th Bin Empty

Empty

Sensor
8th Bin Empty

Empty

Sensor
9th Bin Empty

Empty

Sensor
10th Bin Empty

Empty

Sensor

tics/Panel Display

position

position

present

At standby

position

Paper

present

present

present

Unblocked Blocked IC4 P75/

Unblocked Blocked IC4 P76/

Paper

present

Paper

present

present

Paper

present

present

Paper

present

Paper

present

Paper

present

Paper

present

Paper

present

Paper

present

Paper

present

Paper

present

Paper

present

Paper

present

10

Not at
raised

position

Not at
raised

position

Paper not

present

Not at
standby
position

Paper not

present

Paper not

present

Paper
present

Paper not

present

Paper not

present

Paper
present

Paper not

present

Paper not

present

Paper not

present

Paper not

present

Paper not

present

Paper not

present

Paper not

present

Paper not

present

Paper not

present

Paper not

present

Paper not

present

Paper not

present

Board

Control

Board

(PWB-A)

Duplex
Control

Board

Control

Board

(PWB-A)

Input

IC

No.

LCC

IC4 P74/

IC4 P73/

IC4 P22/

IC4 P23/

INTP2/

IC4 P24/

IC4 P25/

INTP4/

IC4 P72/

--PJ1A-3

--PJ1A-12

--PJ4A-3

IC1
IC1

IC26

IC1
IC1 P25 PJ6A-7

IC1 P40 PJ6A-5

IC1 P41 P J7A-4A

IC1 P42 PJ7A-11A

IC1 P43 P J7A-4B

IC1 P44 PJ7A-11B

IC1 P45 P J8A-4A

IC1 P46 PJ8A-11A

IC1 P47 P J8A-4B

IC1 P23 PJ8A-11B

P21 PJ9A-4PWB-D

Port

No.

ANI4

ANI3

INTP1

CI

INTP3

ASCK

ANI2

ANI5

ANI6

P26
P27

PE3
P22

CN/PJ

No.

CN4A-6

CN4A-9

CN4A-2

CN3A-5

CN4A-11

CN3A-2

CN3A-8

CN6A-12

CN5A-5

PJ15A-4

PJ12-2

PJ15A-12

PJ13-2

T-5

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

Operation Characteris-

Symbol Panel Display Part/Signal Name

PWB-B Mail Bin

PWB-D 2nd bin Full 2nd Bin Full Sensor Blocked Unblocked IC1 P71 PJ7A-1A
PWB-D 3rd bin Full 3rd Bin Full Sensor Blocked Unblocked IC1 P72 PJ7A-8A
PWB-D 4th bin Full 4th Bin Full Sensor Blocked Unblocked IC1 P73 PJ7A-1B
PWB-D 5th bin Full 5th Bin Full Sensor Blocked Unblocked IC1 P74 PJ7A-8B
PWB-D 6th bin Full 6th Bin Full Sensor Blocked Unblocked IC1 P75 PJ8A-1A
PWB-D 7th bin Full 7th Bin Full Sensor Blocked Unblocked IC1 P76 PJ8A-8A
PWB-D 8th bin Full 8th Bin Full Sensor Blocked Unblocked IC1 P77 PJ8A-1B
PWB-D 9th bin Full 9th Bin Full Sensor Blocked Unblocked IC1 P66 PJ8A-8B
PWB-C 10th bin Full 10th Bin Full Sensor Blocked Unblocked IC1 P67 PJ9A-1

PC1 Finisher Exit

PC3 Exit

PC4 Transport

PC2 Transport

PC6 Full

PC7 Full

PC5 Empty Finisher Tray Paper

PWB-D Finisher Elevator Tray Upper

PC8 Surface

PC9 Empty

PC14 Home

PC12 Home

PC13 Hole

- Home

- Empty St. 1

1st bin Full Non-Sort Bin Full

Sorter

(Non-sort)

(Finisher)

Upper

Lower

(Non-sort)

(Elev. Tray)

(Elev.)

(Elev.)

(CD-Align)

(Stap. Unit)

(store roller)

(Stapler 1)

Needle

Sensor

1st Tray Exit Sensor Paper

Storage Sensor Paper

Upper Entrance
Sensor

Lower Entrance
Sensor

1st Tray Full
Detecting Sensor

Elevator Tray Full
Detecting Sensor

Detecting Sensor

Limit Sensor PQ
Elevator Tray Paper

Detecting Sensor
CD Aligning Home

Position Sensor
Staple Home

Position Sensor
Storage Roller Home

Position Sensor
Exit Rolls Home

Position Sensor
Stapler Home 1 Blocked Unblocked IC1 P71,

Stapler Empty 1 Blocked Unblocked IC1 P72,

tics/Panel Display

10

Blocked Unblocked Control

present

present

present

present
Blocked Unblocked IC26 PC5 PJ19A-3

Blocked Unblocked IC26 P A7 PJ19A-12

position

present
Blocked Unblocked IC26 PA5 PJ25A-9

Blocked Unblocked IC26 PD2 PJ25A-6

Blocked Unblocked IC26 PD3 PJ22A-3

Blocked Unblocked IC26 PC6 PJ20A-6

Blocked Unblocked IC26 PC7 PJ19A-15

Paper not

present

Paper not

present

Paper

Paper not

present

Paper

Paper not

present

Out of

In position IC26 PD1 PJ25A-2

Paper

Paper not

present

Input

Board

Board

(PWB-A)

Control

IC26 PC4 PJ19A-6

Board

(PWB-A)

IC26 PD0 PJ20A-3

IC26 PE6 PJ20A-9

IC26 PE7 PJ19A-8

IC26 PA6 PJ21A-2

IC

Port

No.

ANI1

ANI2

CN/PJ

No.

PJ23A-2

PJ23A-4

No.

IC1 P70 PJ6A-4

T-6

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

Operation Characteris-

Symbol Panel Display Part/Signal Name

- Finisher Self

- Home

- Empty St. 2

-Self

S2
S3

PC10 Home

S4 Punch Hole

PC15 Punch

PC11 Shift Speed Shift Motor Pulse

SW6 Dev. Cyan Toner

SW7 Magenta

SW8 Yellow

SW5 Black Toner

PC28 Transfer

- Set - In position Out of

PC23 2nd

Transfer

PC29 Toner

Collect

PC18 Toner Box

- Fusing

- Fusing Web

PC7 Fuser Roller

PC24 IR Home

SW10 Scanner

Sensor

Priming S1

(Stapler 2)

Priming S2

Raised/

Lowered

Change

Transfer

Belt

Separation

Transfer

Separation

Unit

Separation

Org. Cover Size Reset Switch Lowered Raised - - PJ7D-2

Home

Stapler Self-Priming 1Blocked Unblocked Control

Stapler Home 2 Blocked Unblocked IC1 P75,

Staple Empty 2 Blocked Unblocked IC1 P76,

Needle

Stapler Self-Priming 2Blocked Unblocked IC1 P77,

Elevate

Elevate Tray Raised/

Tray

Lowered

Shift Home Position

(Shift)

Sensor
Hole Punch Position

Switch
Punch Motor Pulse

Speed

Sensor

Sensor
Toner Empty Switch CON OFF Master

Empty

Toner Empty Switch MON OFF IC6 PH5 PJ5I-3A

Toner

Empty

Toner Empty Switch YON OFF IC6 PH4 PJ5I-1A

Toner

Empty

Toner Empty Switch BkON OFF IC6 PH7 PJ5I-5B

Empty

1st Image Transfer

Unit

Retraction Position
Sensor

2nd Image Transfer

Unit

Pressure Position
Sensor

Waste

Waste Toner Full

Toner

Detecting Sensor
Waste Toner Bottle

Set

Set Sensor

Set Fusing Unit In position Out of

Not used Not used Not used - - -

Unit

Fusing Pressure
Position Sensor

Org. Detect Sensor At home Out of

Sensor

tics/Panel Display

10

ON OFF - - PJ4A-4

Blocked Unblocked IC26 PD4 PJ25A-12

ON OFF IC28 PE2 PJ12A-3

Blocked Unblocked IC1 P21

Blocked Unblocked IC1 P24

Not

Retracted

Not

Retracted

Unblocked Blocked IC8 3Y PJ7I-7B

In position Out of

Pressed State

Input

IC

Port

Board

No.

IC1 P73,

Board

(PWB-A)

IC6 PH6 PJ5I-5A

Board

(PWB-I)

Retracted IC5 PI1 PJ17I-1A

Image

Process-

ing

Board

(PWB-C)

IC5 PE7 PJ4I-8

IC5 PI4 PJ7I-5B

IC5 PH5 PJ6I-7A

IC5 PI6 PJ17I-3B

--PJ6C-2

position

Retracted IC5 PI2 PJ14I-6B

position

position

other than

pressed

home

No.

ANI3

ANI5

ANI6

ANI7

INPO

INPO

CN/PJ

No.

PJ23A-3

PJ24A-2

PJ24A-4

PJ24A-3

PJ13A-8

PJ25A-14

T-7

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

Symbol Panel Display Part/Signal Name

PC25 Org.

Sensor

PC30 Org. Detect

PC31 Org. Detect

PC31 Org. Detect

PC33 Org. Detect

PC33 Org. Detect

PC32 Org. Detect

PC32 Org. Detect

PC34 Org. Detect

Detect

15 Degree

Sensor

Sensor 1

Sensor 2

Sensor 3

Sensor 4

Sensor 5

Sensor 6

Sensor 7

Sensor 8

Original Cover
Detecting Sensor

Original Size
Detecting Sensor
FD1

Original Size
Detecting Sensor
FD2

Original Size
Detecting Sensor
FD2

Original Size
Detecting Sensor
FD3

Original Size
Detecting Sensor
FD3

Original Size
Detecting Sensor
CD1

Original Size
Detecting Sensor
CD1

Original Size
Detecting Sensor
CD2

Operation Characteris-

tics/Panel Display

10

Less than

Original

loaded,

mounted

Original

loaded,

mounted

Original

loaded,

mounted

Original

loaded,

mounted

Original

loaded,

mounted

Original

loaded,

mounted

Original

loaded,

mounted

Original

loaded,

mounted

15°

not

not

not

not

not

not

not

not

15° or

more

Original

not loaded

Original

not loaded

Original

not loaded

Original

not loaded

Original

not loaded

Original

not loaded

Original

not loaded

Original

not loaded

Input

Board

Image

Process-

ing

Board

(PWB-C)

IC

Port

No.

CN/PJ

No.

No.

--PJ2C-2B

--PJ7C-1

--PJ7C-7

--PJ7C-9

--PJ9C-3

--PJ9C-5

--PJ7C-12

--PJ7C-14

--PJ9C-10

T-8

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

2-3. How to Interpret “State Confirm” of “Tech. Rep. Mode”

Study the following to interpret data provided by “State Confirm” of “Tech. Rep. Mode.”
Note, however, that the specific data given hereunder is only for reference.

4004P054CA

(1) Table #

Vb-C/-M/-Y/-Bk

Output table value of each developing bias,
representing data applicable during making
copies.
Though the minus sign is not displayed, all
are negative values.

4004P055CA

4004P056CA

Standard: Color (C , M, and Y) : Arou nd -400 V

If the image is light, the value becomes
great.
If the image is dark, the value becomes
small.
Used as a means of correcting image quality
problems.

Vg-C/-M/-Y/-Bk

Output table value of each PC Drum Charge
Corona grid mesh, representing data appli­cable during making copies.
Though the minus sign is not displayed, all
are negative values.
Standard: Color (C , M, and Y) : Arou nd -500 V

If the image is light, the value becomes
great.
If the image is dark, the value becomes
small.
Used as a means of correcting image quality
problems.

Black (Bk): Around -800 V

Black (Bk): Around -900 V

T-9

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(2) Level History 1

ATDC-C/-M/-Y/-Bk

Displays T/C ratios.
The value is displayed in units of 0.01 %.
Target value:
Color (C, M, and Y) T/C: 5 ±1 %
Black (Bk) T/C: 4.5 ±1 %

AIDC1/2

Displays the AIDC Sensor output values.
The value is displayed in units of 0.01 V.
Normally, the value should be around 4.5 V

4004P057CA

and the output can range from 0 V to 5 V.

Temp Upr./Lwr.

Displays the temperatures of the Upper and
Lower Fusing Rollers.
The value is displayed in units of 5 °C.

(3) Level History 2

AIDC Sensor Adjust Value 1/2

Displays the AIDC intensity adjustment val­ues.
The values represent the intensity deter­mined through AIDC intensity control.
The value is displayed in units of 1 step.
Intensity range: 0 to 255

4004P058CA

T-10

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

2-4. Paper Misfeed

When a paper misfeed occurs in the copier, the misfeed message, misfeed location, and
paper location are displayed on the Touch Panel.

3

2

4

6

5

1

7
8
9

10

11

12

11

13

11

14

11

15

Display Misfeed/Paper Location Ref. Item No.

1ADF take-up
2 ADF transport
3 ADF turnover/exit
4 Horizontal Unit

5

Mailbin/Finishing option transport/
Finishing option exit

See relevant

Option Service Manual.

6 Mailbins
7 Duplex Unit transport (8)
8 Fusing/Exit (5)

9 2nd Image Transfer (4)
10 Manual Bypass take-up (2)
11 Vertical Transport/Duplex Unit take-up (3)
12 1st Drawer take-up (1)
13 2nd Drawer take-up (1)

14

3rd Drawer take-up/LCC take-up/
LCC Lift 2 to 1 paper transport

(6) (7)

15 4th Drawer take-up (6) (7)

4004P059CA

<Misfeed Display Resetting Procedure>

Misfeed in copier Open the relevant door, clear the misfeed and
Misfeed in option

remove paper left, and then close the door. (For
the option, clear the misfeed and then install the
option back up against the copier.)

T-11

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

2-5. Misfeed Detecting Sensor Layout

• System Mounted with AD-231 and DB-431

Exit Sensor (PC10)
2/ OHP Detecting Sensor (PC19)

Synchronizing Roller Sensor (PC17)

Duplex Unit Transport Sensor 1 (PI1)
Duplex Unit Transport Sensor 2

(PC1)
Manual Feed Paper Take-Up Sensor

(PC15)
1st Drawer Double Feed Sensor

(PC13)
2nd Drawer Paper Take-Up Sensor

(PC101)
2nd Drawer Double Feed Sensor

(PC105)

4011T055AA

LCC Registration Sensor (RSEN)
LCC Paper Take-Up Sensor (PPS0)

T-12

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

• System Mounted with AD-231 and PF-231

4011T056AA

Exit Sensor (PC10)
OHP Detecting Sensor (PC19)
Synchronizing Roller Sensor (PC17)
Duplex Unit Transport Sensor 1 (PI1)

Duplex Unit Transport Sensor 2
(PC1)

Manual Feed Paper Take-Up Sensor
(PC15)

1st Drawer Double Feed Sensor
(PC13)
2nd Drawer Paper Take-Up Sensor
(PC101)

2nd Drawer Double Feed Sensor
(PC105)

3rd Drawer Paper Take-Up Sensor
(PC1)

3rd Drawer Double Feed Sensor
(PC5)

4th Drawer Paper Take-Up Sensor
(PC1)

4th Drawer Double Feed Sensor
(PC5)

T-13

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

2-6. Types of Misfeed Detection and Detection Timing

• The following lists the types of misfeed detection and detection timings for different mis­feed locations.

• The symbol “L” (for the leading edge) and “T” (for the trailing edge) given in ( ) indicate
the particular edge of the paper detected by the sensor.

<Copier Paper Take-Up Misfeed>

Type Detection Start Detection

Paper take-up
failure detection

1st Drawer size
error detection

2nd Drawer size
error detection

Detection of
paper left in 2nd
Drawer

1st Drawer Paper Take-Up
Clutch energized

2nd Drawer Paper Take-Up
Clutch energized

Synchronizing Roller Sensor (L) Synchronizing Roller Sensor (T)

2nd Drawer Paper Take-Up
Sensor (L)

Power Switch is turned ON,
door or cover is opened and
closed, misfeed or malfunction
is reset

Synchronizing Roller Sensor (L)

2nd Drawer Paper Take-Up Sensor (L)

[When the paper size detected is ±20
mm or more of the size data fed from
the controller]

2nd Drawer Paper Take-Up Sensor (T)
[When the paper size detected is ±20
mm or more of the size data fed from
the controller]

2nd Drawer Paper Take-Up Sensor
activated

<Manual Bypass Take-Up Misfeed>

Type Detection Start Detection

Bypass paper
take-up failure
detection

Manual bypass
size error detec­tion

Detection of
paper left in
Manual Bypass
Table

<Copier Vertical Transport Misfeed>

Type Detection Start Detection

2nd Drawer
paper take-up
failure

Manual Feed Paper Take-Up
Sensor (L)

Synchronizing Roller Sensor (L) Synchronizing Roller Sensor (T)

Power Switch is turned ON,
door or cover is opened and
closed, misfeed or malfunction
is reset

2nd Drawer Paper Take-Up
Sensor (L)

Synchronizing Roller Sensor (L)

[When the paper size detected is ±20
mm or more of the size data fed from
the controller]

Manual Feed Paper Take-Up Sensor
activated

Synchronizing Roller Sensor (L)

T-14

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

<2nd Image Transfer Misfeed>

Type Detection Start Detection

2nd Image
Transfer mis­feed detection

Detection of
paper left at 2nd
Image Transfer

<Exit Misfeed>

Type Detection Start Detection

Exit misfeed Exit Sensor activated (L) Exit Sensor deactivated (T)

Detection of
paper left at exit

Synchronizing Roller Sensor (L) Synchronizing Roller Sensor (T)

Exit Sensor (L)

Power Switch is turned ON,
door or cover is opened and
closed, misfeed or malfunction
is reset

Exit Sensor deactivated (T) Duplex Unit Transport Sensor 1 (L)
Power Switch is turned ON,

door or cover is opened and
closed, misfeed or malfunction
is reset

Synchronizing Roller Sensor activated,
OHP Detecting Sensor activated

Exit Sensor activated

<PF-231 Paper Take-Up Misfeed>

Type Detection Start Detection

3rd Drawer size
error detection

4th Drawer size
error detection

Detection of
paper left in 3rd
Drawer

Detection of
paper left in 4th
Drawer

3rd Drawer Paper Take-Up
Sensor (L)

4th Drawer Paper Take-Up
Sensor (L)

Power Switch is turned ON,
door or cover is opened and
closed, misfeed or malfunction
is reset

Power Switch is turned ON,
door or cover is opened and
closed, misfeed or malfunction
is reset

3rd Drawer Paper Take-Up Sensor (T)
[When the paper size detected is ±20
mm or more of the size data fed from
the controller]

4th Drawer Paper Take-Up Sensor (T)
[When the paper size detected is ±20
mm or more of the size data fed from
the controller]

3rd Drawer Paper Take-Up Sensor
activated

4th Drawer Paper Take-Up Sensor
activated

T-15

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

<DB-431 Paper Take-Up Misfeed>

Type Detection Start Detection

LCC misfeed
detection

Lift 2 to 1 mis­feed detection

LCC vertical
transport mis­feed detection

LCC size error
detection

Detection of
paper left in
LCC

LCC paper take-up request LCC Exit signal ON

LCC Paper Take-Up Request LCC Paper Take-Up Sensor activated,

LCC Exit signal ON 2nd Drawer Paper Take-Up Sensor (L)

2nd Drawer Paper Take-Up
Sensor (L)

Power Switch is turned ON,
door or cover is opened and
closed, misfeed or malfunction
is reset

LCC Paper Empty Sensor 1 activated,
Paper Standby Position Sensor acti­vated

2nd Drawer Paper Take-Up Sensor (T)
[When the paper size detected is ±20
mm or more of the size data fed from
the controller]

LCC Registration Sensor Paper-Left
Misfeed signal ON

<Duplex Paper Take-Up Misfeed>

Type Detection Start Detection

Duplex paper
take-up mis­feed detection

Duplex trans­port misfeed
detection

Detection of
paper left in
Duplex

Duplex paper take-up start Synchronizing Roller Sensor (L), Man-

Duplex Unit Transport Sensor 1
(L)

Power Switch is turned ON,
door or cover is opened and
closed, misfeed or malfunction
is reset

ual Feed Paper Take-Up Sensor (L)

Duplex Unit Transport Sensor 2 (L)

Duplex Unit Transport Sensor 1 acti­vated, Duplex Unit Transport Sensor 2
activated

T-16

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

2-7. Misfeed Troubleshooting Procedures

(1) Copi e r Pa pe r Ta ke-Up Misfeed

Relevant Electrical Parts

1st Drawer Paper Take-Up Clutch (CL1)
2nd Drawer Paper Take-Up Clutch (CL101)
Synchronizing Roller Sensor (PC17)
Main Motor (M13)

2nd Drawer Paper Take-Up Motor (M101)
Master Board (PWB-I)
DC Power Supply 1 (PU1)
2nd Drawer Control Board (PWB-A)

PU1

PJ7PU1-4(DC24 V)
PJ7PU1-5(GND)

M13

PC17

CL1

CL101

M101

PJ105

1
2
3
4
5
6
7
8

PJ116

3
2
1

CN63

121

8
94

12 1

CN55

CN1

CN61

1

PWB-I

PJ13I-7A(M13 LOCK)
PJ13I-8A(M13 REM)

PJ13I-9A(M13 CLK)
PJ13I-10A(DC5 V)
PJ13I-11A(GND)
PJ13I-12A(M13 CW/CCW)

67
5

21
12

21
12

14
23
32
4

PJ14I-7A(DC5 V)
PJ14I-8A(GND)
PJ14I-9A(PC17 ON)

PJ15I-10A(DC24 V)
PJ15I-11A(CL1 REM)

PWB-A(2nd Tray)

PJ3A-13B(DC24 V)
PJ3A-14B(CL101 REM)

–

PJ5A-4(

)

B

PJ5A-3(B)

–

PJ5A-2(

)

A

PJ5A-1(A)

–

4004C16TAD

T-17

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

Copier Paper Take-Up Misfeed Troubleshooting Procedures

• Paper is not taken up at all.

Step Check Item Result Action

1 Paper meets product specifications. NO Change paper.
2 Paper is curled, wavy, or damp. YES Change paper. Instruct user

in correct paper storage.
Install Paper Dehumidifying
Heater.

3 Edge Guide and Trailing Edge Stop are at

correct position to accommodate paper.

4 Paper Take-Up Roll is deformed, worn, or

dirty with paper dust or other foreign matter.

5 Paper Lifting Plate is dirty, deformed, or

scratched.

6 Separator Pad is deformed, worn, or dirty

with paper dust or other foreign matter.

7 Separator Roll is deformed, worn, or dirty

with paper dust or other foreign matter.

8 Paper take-up guide plate is dirty,

deformed, or scratched.

9 Paper take-up guide plate is installed prop-

erly.

10 Paper Take-Up Roll turns when the Start

key is pressed with the 1st Drawer selected.

11 1st Drawer Paper Take-Up Clutch operation

when the Start key is pressed with the 1st
Drawer selected: the voltage across PJ15I­11A on Master Board and GND is DC 24 V
when the clutch is deenergized and DC 0 V
when the clutch is energized.

12 Paper Take-Up Roll turns when the Start

key is pressed with the 2nd Drawer
selected.

13 2nd Drawer Paper Take-Up Clutch opera-

tion when the Start key is pressed with the
2nd Drawer selected: the voltage across
PJ3A-14B on Master Board and GND is DC
24 V when the clutch is deenergized and
DC 0 V when the clutch is energized.

NO Set as necessa ry.

YES Clean or change.

YES Clean or change.

YES Clean or change.

YES Clean or change.

YES Clean or change.

NO Reinstall.

NO Correct drive coupling (cou-

pling engagement, position of
drive transmitting pin).

YES Check for overload. Change

clutch.

NO Change Master Board.

NO Correct drive coupling (cou-

pling engagement, position of
drive transmitting pin).

YES Check for overload. Change

clutch.

NO Change Control Board.

T-18

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(2) Manual Bypass Take-Up Misfeed

Relevant Electrical Parts

Manual Feed Paper Take-Up Sensor
(PC15)
Manual Feed Paper Take-Up Clutch (CL13)

Synchronizing Roller Sensor (PC17)
Synchronizing Roller Clutch (CL21)
Master Board (PWB-I)

CN65

71
26

7

1

CL21

CN30

21
12

CN63

121

8
94

12 1

CN41

67
5

CN33

21
12

11
22
3

3

4

4

5

5

8

8

PC17

CL3

PC15

PJ116

3
2
1

PJ40

1
2
3

DC24 V

PWB-I

PJ14I-14A(DC24 V)
PJ14I-15A(CL21 REM)

PJ14I-7B(DC5 V)
PJ14I-8B(GND)
PJ14I-9B(PC17 ON)

PJ15I-9A(CL3 REM)
PJ15I-7B(PC15 ON)
PJ15I-8B(GND)
PJ15I-9B(DC5 V)

4004C17AD

T-19

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

Manual Bypass Take-Up Misfeed Troubleshooting Procedures

• Paper is not detected.

Step Check Item Result Action

1 I/O check for Manual Feed Paper Take-Up

Sensor operation when the Manual Bypass
Table is used: the voltage across PJ15I-7B
on Master Board and GND is DC 0 V when
the sensor is unblocked and DC 5 V when
the sensor is blocked (paper present).

• Paper is not taken up at all.

Step Check Item Result Action

1 Paper meets product specifications. NO Change paper.
2 Paper is curled, wavy, or damp. YES Change paper. Instruct user

3 Guide plate is dirty with paper dust,

deformed, or scratched.

4 Manual Bypass Take-Up Roll is dirty with

paper dust, deformed, or worn.

5 Manual Bypass Take-Up Roll turns when

the Start key is pressed with the Manual
Bypass Table used.

6 Manual Feed Paper Take-Up Clutch opera-

tion when the Manual Feed Paper Take-Up
Sensor is blocked with the Manual Bypass
Table used: the voltage across PJ15I-9A on
Master Board and GND is DC 24 V when
the clutch is deenergized and DC 0 V when
the clutch is energized.

YES Change Master Board.

NO Correct actuator. Check sen-

sor connector connection.
Change sensor.

in correct paper storage.
Install Paper Dehumidifying
Heater.

YES Clean or change.

YES Clean or change.

NO Correct drive coupling (drive

transmitting gear engage­ment).

YES Check for overload. Change

clutch.

NO Change Master Board.

T-20

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

• Paper is at a stop at the vertical transport section.

Step Check Item Result Action

1 Paper meets product specifications. NO Change paper.
2 Synchronizing Rollers are dirty with paper

dust, deformed, or worn.

3 Paper Dust Remover is deformed or worn. NO Change Paper Dust Remover

4 Paper Dust Remover is installed properly. NO Reinstall Paper Dust

5 An adequate length of loop is formed before

the Synchronizing Rollers.

6 I/O check for Synchronizing Roller Sensor

operation when the Manual Bypass Table is
used: the voltage across PJ14I-9B on Mas­ter Board and GND is DC 0 V when the sen­sor is unblocked (paper present) and DC 5
V when the sensor is blocked.

7 Synchronizing Rollers turn when the Start

key is pressed with the Manual Bypass
Table used.

8 Synchronizing Roller Clutch operation when

the Manual Bypass Table is used: the volt­age across PJ15I-9A on Master Board and
GND after the Manual Feed Paper Take-Up
Clutch has been energized is DC 24 V
when the clutch is deenergized and DC 0 V
when the clutch is energized.

9 Size error display after the misfeed display

has been reset.

YES Clean or change.

Unit.

Remover Unit.

NO Adjust “Paper Loop.” (See

ADJUSTMENT.)

YES Change Master Board.

NO Correct actuator. Check sen-

sor connector connection.
Change sensor.

NO Correct drive coupling (drive

transmitting gear engage­ment).

YES Check for overload. Change

clutch.

NO Change Master Board.

YES Check paper size.

T-21

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(3) Copier Vertical Transport Misfeed

Relevant Electrical Parts

Synchronizing Roller Sensor (PC17)
2nd Drawer Paper Take-Up Sensor
(PC101)
Synchronizing Roller Clutch (CL21)
1st Drawer Paper Take-Up Clutch (CL1)

Main Motor (M13)
2nd Drawer Paper Take-Up Motor (M101)
Master Board (PWB-I)
DC Power Supply 1 (PU1)
2nd Drawer Control Board (PWB-A)

2nd Drawer Paper Take-Up Clutch (CL101)

PJ7PU1-4(DC24 V)
PJ7PU1-5(GND)

PU1

M13

CL21

PC17

CL1

PC101

CL101

M101

PJ105

1
2
3
4
5
6
7
8

PJ116

3
2
1

PJ12

3
2
1

CN30

CN63

8
94

12 1

CN55

PWB-I

PJ13I-7A(M13 LOCK)
PJ13I-8A(M13 REM)

PJ13I-9A(M13 CLK)
PJ13I-10A(DC5 V)
PJ13I-11A(GND)

71
26

1

21
12

14
23
32
4

PJ13I-12A(M13 CW/CCW)

PJ14I-14A(DC24 V)
PJ14I-15A(CL21 REM)

PJ14I-7A(DC5 V)
PJ14I-8A(GND)
PJ14I-9A(PC17 ON)

PJ15I-10A(DC24 V)
PJ15I-11A(CL1 REM)

PWB-A(2nd Tray)

PJ3A-3A(DC5 V)
PJ3A-4A(GND)
PJ3A-5A(PC101 ON)

PJ3A-13B(DC24 V)
PJ3A-14B(CL101 REM)

–

PJ5A-4(

)

B

PJ5A-3(B)

–

PJ5A-2(

)

A

PJ5A-1(A)

–

4004C18TAD

CN65

21
12

7

121

67
5

21
12

CN1

CN61

1

T-22

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

Copier Vertical Transport Misfeed Troubleshooting Procedures

• Paper is at a stop at the vertical transport section.

Step Check Item Result Action

1 Synchronizing Rollers are deformed or

worn.

2 Paper dust deposits on Synchronizing Roll-

ers.

3 Paper Dust Remover is deformed or worn. YES Change Paper Dust Remover

4 Paper Dust Remover is installed properly. NO Reinstall Paper Dust

5 An adequate length of loop is formed before

the Synchronizing Rollers.

6 Vertical transport guide plate is dirty,

deformed, or scratched.

7 I/O check for Synchronizing Roller Sensor

operation: the voltage across PJ14I-9B on
Master Board and GND is DC 0 V (paper
present) when the sensor is unblocked and
DC 5 V when the sensor is blocked.

8 Synchronizing Rollers turn when the Start

key is pressed with the 1st Drawer selected.

9 Synchronizing Roller Clutch operation when

the 1st Drawer is used: the voltage across
PJ14I-14A on Master Board and GND is DC
24 V when the clutch is deenergized and
DC 0 V when the clutch is energized.

10 2nd Drawer Vertical Transport Roller 1 is

dirty with paper dust, deformed, or
scratched.

11 2nd Drawer vertical transport guide plate is

dirty, deformed, or scratched.

12 Synchronizing Rollers turn when the Start

key is pressed with the 2nd Drawer
selected.

13 Synchronizing Roller Clutch operation when

the 2nd Drawer is used: the voltage across
PJ14I-14A on Master Board and GND is DC
24 V when the clutch is deenergized and
DC 0 V when the clutch is energized.

YES Check type of paper being

used.

YES Clean Synchronizing Rollers.

Check Paper Dust Remover
for proper function.

Unit.

Remover Unit.

NO Adjust “Paper Loop.” (See

ADJUSTMENT.)

YES Clean or change.

YES Change Master Board.

NO Correct actuator. Check sen-

sor connector for connection.
Change sensor.

NO Correct drive coupling (drive

transmitting gear engage­ment).

YES Check for overload. Change

clutch.

NO Change Master Board.

YES Clean or change.

YES Clean or change.

NO Correct drive coupling (drive

transmitting gear engage­ment).

YES Check for overload. Change

clutch.

NO Change Master Board.

T-23

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

Step Check Item Result Action

14 2nd Drawer Paper Take-Up Motor turns

when the Start key is pressed with the 2nd
Drawer selected.

15 Size error display after the misfeed display

has been reset.

NO Correct drive coupling (cou-

pling engagement, position of
drive transmitting pin).
Change motor. Change 2nd
Drawer Control Board.

YES Check paper size. Check

positioning of the Edge Guide
and Trailing Edge Stop.

T-24

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(4) 2nd Image Transfer Misfeed

Relevant Electrical Parts

Exit Sensor (PC10)
Synchronizing Roller Sensor (PC17)
Main Motor (M13)

Fusing Drive Motor (M14)
Master Board (PWB-I)
DC Power Supply 1 (PU1)

PJ7PU1-4(DC24 V)
PJ7PU1-5(GND)

PU1

M14

M13

PC10

PC17

PJ106

1
2
3
4
5
6
7
8

PJ105

1
2
3
4
5
6
7
8

PJ133

3
2
1

PJ116

3
2
1

CN17

CN63

121

8
94

12 1

PWB-I

PJ13I-1A(M14 LOCK)
PJ13I-2A(M14 REM)

PJ13I-3A(M14 CLK)
PJ13I-4A(DC5 V)
PJ13I-5A(GND)
PJ13I-6A(M14 CCM/CM)

PJ13I-7A(M13 LOCK)
PJ13I-8A(M13 REM)

PJ13I-9A(M13 CLK)
PJ13I-10A(DC5 V)
PJ13I-11A(GND)
PJ13I-12A(M13 CCM/CM)

31
22
13

67
5

PJ3I-12A(DC5 V)
PJ3I-13A(GND)
PJ3I-14A(PC10 ON)

PJ14I-7B(DC5 V)
PJ14I-8B(GND)
PJ14I-9B(PC17 ON)

4004C20TAB

T-25

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

2nd Image Transfer Misfeed Troubleshooting Procedures

• Paper is at a stop at the 2nd Image Transfer section.

Step Check Item Result Action

1 Vertical transport guide plate is dirty,

deformed, or scratched.

2 Image Transfer Roller Unit is not installed

properly.

3 Pre-Image Transfer Guide Plate is dirty,

deformed, or scratched.
Seal is separated.

4 Transfer Belt is driven when the Start key is

pressed.

5 Transfer Belt is deformed or damaged. YES Change Transfer Belt Unit.
6 Transfer Roller turns when the Start key is

pressed.

7 Transfer Roller is dirty with paper dust or

other foreign matter, deformed, or worn.

8 Fusing Rollers turn when the Start key is

pressed.

9 Paper winds around Transfer Belt. YES Readjust Paper Separator

10 Paper winds around Transfer Roller. YES Change Transfer Roller Unit.
11 I/O check for Exit Sensor operation: the

voltage across PJ3I-14A on Master Board
and GND is DC 0 V (paper present) when
the sensor is unblocked and DC 5 V when
the sensor is blocked.

YES Clean or change.

YES Reinstall.

YES Clean or change Image

Transfer Roller Unit.

NO Correct drive coupling (drive

transmitting gear engage­ment). Reinstall Transfer Belt
Unit.

NO Correct drive coupling (drive

transmitting gear engage­ment). Reinstall Transfer
Roller Unit.

YES Clean or change Image

Transfer Roller Unit.

NO Correct drive coupling (drive

transmitting gear engage­ment). Correct the installed
position of Fusing Unit.

Fingers. Readjust “Top Mar­gin.”

YES Change Master Board.

NO Correct actuator. Check sen-

sor connector for connection.
Change sensor.

T-26

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(5) Exit Misfeed

Relevant Electrical Parts

Exit Sensor (PC10)
Fusing Drive Motor (M14)

Master Board (PWB-I)
DC Power Supply 1 (PU1)

PJ7PU1-4(DC24 V)
PJ7PU1-5(GND)

PU1

M14

PC10

PJ106

1
2
3
4
5
6
7
8

PJ133

3
2
113

CN17

PWB-I

PJ13I-1A(M14 LOCK)
PJ13I-2A(M14 REM)

PJ13I-3A(M14 CLK)
PJ13I-4A(DC5 V)
PJ13I-5A(GND)
PJ13I-6A(M14 CCM/CM)

31
22

PJ3I-12A(DC5 V)
PJ3I-13A(GND)
PJ3I-14A(PC10 ON)

4004C21TAA

T-27

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

Exit Misfeed Troubleshooting Procedures

• Paper is at a stop at the 2nd Image Transfer section.

Step Check Item Result Action

1 Fusing guide plate is dirty, deformed, or

damaged.

2 Fusing Rollers are dirty, deformed, or

scratched.

3 Fusing Paper Separator Fingers are dirty,

deformed, or worn.

4 Fusing Exit Roller is dirty, deformed, or

scratched.

5 Fusing Rollers turn when the Start key is

pressed.

6 I/O check for Exit Sensor operation: the

voltage across PJ3I-14A on Master Board
and GND is DC 0 V (paper present) when
the sensor is unblocked and DC 5 V when
the sensor is blocked.

7 Exit Turnover Roller is dirty, deformed, or

scratched.

8 Exit Turnover Roller turns when the Start

key is pressed.

YES Clean or change.

YES Clean or change Fusing Unit.

YES Clean, correct, or change.

YES Clean or change.

NO Correct drive coupling (drive

transmitting gear engage­ment). Correct installed posi­tion of Fusing Unit. Change
Fusing Unit.

YES Change Master Board.

NO Correct actuator. Check sen-

sor connector for connection.
Change sensor.

YES Clean or change.

NO Correct drive coupling (roller

position).

T-28

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(6) PF-231 Paper Take-Up Misfeed

Relevant Electrical Parts

3rd Drawer Paper Take-Up Sensor (PC1)
4th Drawer Paper Take-Up Sensor (PC1)
3rd Drawer Paper Take-Up Clutch (CL1)
4th Drawer Paper Take-Up Clutch (CL1)

3rd Drawer Paper Take-Up Motor (M1)
4th Drawer Paper Take-Up Motor (M1)
3rd Drawer Control Board (PWB-A)
4th Drawer Control Board (PWB-A)

PC1

CL1

M1

PC1

CL1

M1

PJ12

3
2
1

PJ12

3
2
1

CN73

21
12

CN61

14
23
32
4

1

CN73

21
12

CN61

14
23
32

1

4

PWB-A(3rd Tray)

PJ3A-3A(DC5 V)
PJ3A-4A(GND)
PJ3A-5A(PC1 ON)

PJ3A-13B(DC24 V)
PJ3A-14B(CL1 REM)

–

PJ5A-4(

B

PJ5A-3(B)

–

PJ5A-2(

A

PJ5A-1(A)

PWB-A(4th Tray)

PJ3A-3A(DC5 V)
PJ3A-4A(GND)
PJ3A-5A(PC1 ON)

PJ3A-13B(DC24 V)
PJ3A-14B(CL1 REM)

–

PJ5A-4(

B

PJ5A-3(B)

–

PJ5A-2(

A

PJ5A-1(A)

)
)

)
)

–

–

T-29

4004C22TAB

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

PF-231 Paper Take-Up Misfeed Troubleshooting Procedures

• Paper is not taken up at all.

Step Check Item Result Action

1 Paper meets product specifications. NO Change paper.
2 Paper is curled, wavy, or damp. YES Change paper. Instruct user

in correct paper storage.
Install Paper Dehumidifying
Heater.

3 Edge Guide and Trailing Edge Stop are at

correct position to accommodate paper.

4 Paper Take-Up Roll is deformed, worn, or

dirty with paper dust or other foreign matter.

5 Paper Lifting Plate is dirty, deformed, or

scratched.

6 Separator Roll is deformed, worn, or dirty

with paper dust or other foreign matter.

7 Paper take-up guide plate is dirty,

deformed, or scratched.

8 Paper take-up guide plate is installed prop-

erly.

9 Paper Take-Up Roll turns when the Start

key is pressed with the 3rd Drawer
selected.

10 3rd Drawer Paper Take-Up Clutch opera-

tion when the Start key is pressed with the
3rd Drawer selected: the voltage across
PJ3A-14B on Control Board and GND is DC
24 V when the clutch is deenergized and
DC 0 V when the clutch is energized.

11 3rd Drawer Paper Take-Up Motor turns

when the Start key is pressed with the 3rd
Drawer selected.

12 Paper Take-Up Roll turns when the Start

key is pressed with the 4th Drawer
selected.

13 4th Drawer Paper Take-Up Clutch opera-

tion when the Start key is pressed with the
4th Drawer selected: the voltage across
PJ3A-14B on Control Board and GND is DC
24 V when the clutch is deenergized and
DC 0 V when the clutch is energized.

NO Set as necessa ry.

YES Clean or change.

YES Clean or change.

YES Clean or change.

YES Clean or change.

NO Reinstall.

NO Correct drive coupling (cou-

pling engagement, position of
drive transmitting pin).

YES Check for overload. Change

clutch.

NO Change 3rd Drawer Control

Board.

NO Correct drive coupling (drive

transmitting gear engage­ment). Change motor.
Change 3rd Drawer Control
Board.

NO Correct drive coupling (cou-

pling engagement, position of
drive transmitting pin).

YES Check for overload. Change

clutch.

NO Change 4th Drawer Control

Board.

T-30

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

Step Check Item Result Action

14 4th Drawer Paper Take-Up Motor turns

when the Start key is pressed with the 4th
Drawer selected.

• Paper is at a stop at the Vertical Transport Rollers.

Step Check Item Result Action

1 Paper take-up guide plate or vertical trans-

port guide plate is dirty or deformed.

2 Vertical Transport Rollers are dirty with

paper dust, deformed, or worn.

3 I/O check for 3rd Drawer Paper Take-Up

Sensor operation when the 3rd Drawer is
used: the voltage across PJ3A-5A on Con­trol Board and GND is DC 0 V when the
sensor is unblocked and DC 5 V (paper
present) when the sensor is blocked.

4 Vertical Transport Roller 3 turns when the

Start key is pressed with 3rd Drawer
selected.

5 I/O check for 4th Drawer Paper Take-Up

Sensor operation when the 4th Drawer is
used: the voltage across PJ3A-5A on Con­trol Board and GND is DC 0 V when the
sensor is unblocked and DC 5 V (paper
present) when the sensor is blocked.

6 Vertical Transport Roller 4 turns when the

Start key is pressed with 4th Drawer
selected.

7 Size error display after the misfeed display

has been reset.

NO Correct drive coupling (drive

transmitting gear engage­ment). Change motor.
Change 4th Drawer Control
Board.

YES Clean, correct, or change.

YES Clean or change.

YES Change 3rd Drawer Control

Board.

NO Correct actuator. Check sen-

sor connector for connection.
Change sensor.

NO Correct drive coupling (drive

transmitting gear engage­ment, clutch spring opera­tion).

YES Change 4th Drawer Control

Board.

NO Correct actuator. Check sen-

sor connector for connection.
Change sensor.

NO Correct drive coupling (drive

transmitting gear engage­ment, clutch spring opera­tion).

YES Check paper size.

T-31

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(7) DB-431 Paper Take-Up Misfeed

Relevant Electrical Parts

LCC Paper Take-Up Sensor (PPS0)
Paper Standby Position Sensor (S1)
LCC Registration Sensor (RSEN)
LCC Paper Take-Up Clutch 1 (P1CL)

LCC Separator Clutch (BCL)
LCC Registration Clutch (RCL)
LCC Transport Motor (HMOT)
LCC Control Board (PWB-A)

LCC Paper Take-Up Clutch 2 (P2CL)

S1

RSEN

PPSO

HMOT

BCL

RCL

P2CL

PJ10

1
2
3

PJ7

1
2
3

PJ4

1
2
3

PJ4

1
2
3
4
5
6

CN14

12
21

CN13

12
21

CN12

12
21

PWB-A(LCC Tray)

CN3A-6(S1 LED)
CN3A-5(S1 ON)
CN3A-4(DC5 V)

CN4A-3(RSEN LED)
CN4A-2(RSEN ON)
CN4A-1(DC5 V)

CN4A-12(PPSO LED)
CN4A-11(PPSO ON)
CN4A-10(DC5 V)

CN6A-6(HMOT CLK)
CN6A-5(DC5 V)
CN6A-4(HMOT SIG)
CN6A-3(CTND)

CN6A-1(DC24 V)

CN7A-2(BCL ON)
CN7A-1(DC24 V)

CN7A-4(RCL ON)
CN7A-3(DC24 V)

CN7A-6(P2CL ON)
CN7A-5(DC24 V)

P1CL

CN11

12
21

T-32

CN7A-8(P1CL ON)
CN7A-7(DC24 V)

4004C23TAB

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

DB-431 Paper Take-Up Misfeed Troubleshooting Procedures

• Paper is not taken up at all. (Lift 1)

Step Check Item Result Action

1 Paper meets product specifications. NO Change paper.
2 Paper is curled, wavy, or damp. YES Change paper. Instruct user

in correct paper storage.
Install Paper Dehumidifying

Heater.
3 Lift is dirty, deformed, or damaged. YES Clean or change.
4 Paper Take-Up Roll 1 is dirty, deformed, or

scratched.

5 Paper Take-Up Roll 1 turns when the Start

key is pressed with Lift 1 used.

6 LCC Paper Take-Up Clutch 1 operation

when the Start key is pressed with Lift 1
used: the voltage across CN7A-8 on LCC
Control Board and GND is DC 24 V when
the clutch is deenergized and DC 0 V when
the clutch is energized.

YES Clean or change.

NO Correct drive coupling (drive

transmitting gear engage-

ment, spring operation, belt

tension).

YES Check for overload. Change

clutch.

NO Change LCC Control Board.

• Paper is not taken up at all. (Lift 2)

Step Check Item Result Action

1 Paper meets product specifications. NO Change paper.
2 Paper is curled, wavy, or damp. YES Change paper. Instruct user

3 Lift is dirty, deformed, or damaged. YES Clean or change.
4 Paper Take-Up Roll 2 is dirty, deformed, or

scratched.

5 Paper Take-Up Roll 2 turns when the Start

key is pressed with Lift 2 used.

6 LCC Paper Take-Up Clutch 2 operation

when the Start key is pressed with Lift 2
used: the voltage across PJ7A-6 on LCC
Control Board and GND is DC 24 V when
the clutch is deenergized and DC 0 V when
the clutch is energized.

in correct paper storage.

Install Paper Dehumidifying

Heater.

YES Clean or change.

NO Correct drive coupling (drive

transmitting gear engage-

ment, spring operation, belt

tension).

YES Check for overload. Change

clutch.

NO Change LCC Control Board.

T-33

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

• Paper is stationary at the Vertical Transport Roller.

Step Check Item Result Action

1 Feed Roll is deformed, worn, or dirty with

paper dust or other foreign matter.

2 Separator Roll is deformed, worn, or dirty

with paper dust or other foreign matter.

3 Paper take-up guide plate is dirty,

deformed, or damaged.

4 Vertical Transport Roller is dirty with paper

dust, deformed, or worn.

5 Vertical transport guide plate is dirty or

deformed.

6 I/O check for Paper Standby Position Sen-

sor operation when the LCC Drawer is
used: the voltage across PJ3A-5 on LCC
Control Board and GND is DC 5 V when
there is reflected light and DC 0 V when
there is no reflected light.

7 Feed Roll turns when the Start key is

pressed with the LCC Drawer selected.

8 Separator Roll turns when the Start key is

pressed with the LCC Drawer selected.

9 LCC Separator Clutch operation when the

Start key is pressed with the LCC Drawer
selected: the voltage across CN7A-2 on
LCC Control Board and GND is DC 24 V
when the clutch is deenergized and DC 0 V
when the clutch is energized.

10 I/O check for LCC Registration Sensor

operation when the LCC Drawer is used:
the voltage across CN4A-2 on LCC Control
Board and GND is DC 5 V when there is
reflected light and DC 0 V when there is no
reflected light.

11 Vertical Transport Rollers turn when the

Start key is pressed with the LCC Drawer
selected.

12 LCC Registration Clutch operation when

the Start key is pressed with the LCC
Drawer selected: the voltage across CN7A­4 on LCC Control Board and GND is DC 24
V when the clutch is deenergized and DC 0
V when the clutch is energized.

YES Clean or change.

YES Clean or change.

YES Clean or change.

YES Clean or change.

YES Clean, correct, or change.

YES Change LCC Control Board.

NO Check sensor connector for

connection. Change sensor.

NO Correct drive coupling (drive

transmitting gear engage-

ment, belt tension).

NO Correct drive coupling (spring

operation).

YES Check for overload. Change

clutch.

NO Change LCC Control Board.

YES Change LCC Control Board.

NO Check sensor connector for

connection. Change sensor.

NO Correct drive coupling (drive

transmitting gear engage-

ment).

YES Check for overload. Change

clutch.

NO Change LCC Control Board.

T-34

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(8) AD-231 Paper Take-Up Misfeed

Relevant Electrical Parts

Duplex Unit Transport Sensor 1 (PI1)
Duplex Unit Transport Sensor 2 (PC1)
Manual Feed Paper Take-Up Sensor
(PC15)

Duplex Unit Transport Motor (M2)
Switchback Motor (M1)
Duplex Control Board (PWB-A)
Master Board (PWB-I)

Manual Feed Paper Take-Up Clutch (CL3)

CL3

PC15

PJ40

1
2
3

CN41

21
12

CN33

11
22
3

3

4

4

5

5

8

8

M1

M2

DC24 V

PWB-I

PJ15A-9A(CL3 REM)
PJ15A-7B(PC15 ON)
PJ15A-8B(GND)
PJ15A-9B(DC5 V)

PWB-A

–

PJ3A-1(

)

B

PJ3A-2(B)

–

PJ3A-3(

)

A

PJ3A-4(A)

–

PJ2A-1(

)

B

PJ2A-2(B)

–

PJ2A-3(

)

A

PJ2A-4(A)

PC1

PJ10

3
2
1

T-35

PJ4A-1(DC5 V)
PJ4A-2(GND)
PJ4A-3(PC1 ON)

PI1

4004C24TAD

4004C24TAD

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

AD-231 Paper Take-Up Misfeed Troubleshooting Procedures

• Paper is at a stop in the Duplex Unit transport section.

Step Check Item Result Action

1 Transport Roller is dirty, deformed, or worn. YE S Clean or change.
2 Transport Roll is dirty, deformed, or worn. YES Clean or change.
3 Transport guide is dirty, deformed, or dam-

aged.

4 Torn piece of paper left at the transport sec-

tion.

5 Duplex Unit Transport Roller 1 turns when

the Start key is pressed with the Duplex
Unit used.

6 Switchback Motor turns when the Start key

is pressed with the Duplex Unit used.

7 Duplex Unit Transport Roller 2 turns when

the Start key is pressed with the Duplex
Unit used.

8 Duplex Unit Transport Roller 3 turns when

the Start key is pressed with the Duplex
Unit used.

9 Duplex Unit Transport Motor turns when the

Start key is pressed with the Duplex Unit
used.

YES Clean, correct, or change.

YES Clean.

NO Correct drive coupling (drive

transmitting gear engage-

ment).

NO Correct drive coupling.

Change motor. Change

Duplex Control Board.

NO Correct drive coupling (drive

transmitting gear engage-

ment).

NO Correct drive coupling (drive

transmitting gear engage-

ment).

NO Correct drive coupling.

Change motor. Change

Duplex Control Board.

• Paper is at a stop at the Manual Bypass take-up section.

Step Check Item Result Action

1 I/O check for Manual Feed Paper Take-Up

Sensor operation when the Manual Bypass
Table is used: the voltage across PJ15I-7B
on Master Board and GND is DC 0 V when
the sensor is unblocked and DC 5 V (paper
present) when the sensor is blocked.

2 Manual Bypass Paper Take-Up Roll is dirty

with paper dust, deformed, or worn.

3 Manual Bypass Paper Take-Up Roll turns

when the Start key is pressed with the Man­ual Bypass Table used.

4 Manual Feed Paper Take-Up Clutch opera-

tion when Manual Feed Paper Take-Up
Sensor is unblocked with the Manual
Bypass Table used: the voltage across
PJ15I-9A on Master Board and GND is DC
24 V when the clutch is deenergized and
DC 0 V when the clutch is energized.

YES Change Master Board.

NO Correct actuator. Check sen-

sor connector for connection.

Change sensor.

YES Clean or change.

NO Correct drive coupling (drive

transmitting gear engage-

ment).

YES Check for overload. Change

clutch.

NO Change Master Board.

T-36

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

3. MALFUNCTIONS

The copier’s CPU performs a self-diagnostics function that, on detecting a malfunction,
gives the corresponding malfunction code and maintenance call mark on the Touch Panel.

Resetting a Malfunction

• Press the Trouble Reset Switch on the Tech. Rep. Setting Switches Board to reset the
following malfunctions: IR-related malfunctions (except the following, i.e., C3310: CCD
clamp gain adjustment failure; C3700: IR Cooling Fan Motor 1 turning at abnormal tim­ing; C3710: IR Cooling Fan Motor 2 turning at abnormal timing; C3720: Original Glass
Cooling Fan Motor turning at abnormal timing) and fusing-related malfunctions.

• For any other malfunctions, open and close the Front Door or turn OFF and ON the
Power Switch.

<Warning>

4004P045BA

4004P060CA

If the maintenance call mark appears, touch it to view a screen (“State Confirm”)
that shows data in greater details.

4004P061CA

T-37

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

3-1. Detection Timing by Warning Code

• If an image stabilization or IR-related fault occurs, the corresponding warning code
appears.

• Refer to the following table and take necessary action to remedy the faulty spot.

Code Fault Detection Timing

P-5 AIDC Sensor failure (AIDC

Sensor 1)

P-6 Cyan Imaging Unit failure • The results of converting the adjustment pattern
P-7 Magenta Imaging Unit fail-

ure
P-8 Yellow Imaging Unit failure
P-9 Black Imaging Unit failure

P-21 Color Shift Correction fail-

ure (test pattern failure)

P-22 Color Shift Correction fail-

ure (correction amount fail-

ure)

P-23 Cyan 1st Image Transfer

ATVC Failure

P-24 Magenta 1st Image Trans-

fer ATVC Failure

P-25 Yellow 1st Image Transfer

ATVC Failure

P-26 Black 1st Image Transfer

ATVC Failure

P-27 2nd Image Transfer ATVC

Failure

P-28 AIDC Sensor failure (AIDC

Sensor 2)

• All readings of the detection points are 4.8 V or
more or the selected reading is 1.0 V or less dur­ing AIDC Sensor intensity correction.

reading to reflection density on paper fall short of
the specified value during max. density adjustment
(Vg/Vb adjustment).

• The ATDC Sensor output when 0 gradation mea­surement is taken is 253 (4.96 V) or more during γ
correction.

• The result of converting the adjustment pattern
reading to reflection density on paper is 0.4 V or
less.

• The calculated value of the CD color shift correc­tion amount is more or less than the specified
value.

• The calculated value of the FD color shift correc­tion amount is more or less than the specified
value.

• The CD registration distance is greater than the
specified range during registration correction.

• The FD registration distance is greater than the
specified range during registration correction.

• Skew correction amount is more than the specified
value.

• The average value of voltage readings taken by
the ATVC adjustment circuit is less than 0.5 V dur­ing ATVC adjustment.

• The average value of voltage readings taken by
the ATVC adjustment circuit is 0.5 V or more and
less than 0.6 V during ATVC adjustment. Or there
are five consecutive adjustment sequences, each
exceeding 4.6 V. (ATVC adjustment is made when
power is turned OFF and ON. A warning is issued
through a minimum of five sequences of turning
power OFF and ON.)

• All readings of the detection points are 4.8 V or
more or the selected reading is 1.0 V or less dur­ing AIDC Sensor intensity correction.

T-38

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

Code Fault Detection Timing

S-1 Gain adjustment failure • Each gain adjustment value for R, G, or B is 240

S-2 Intensity adjustment failure • Lamp voltage adjustment value Dx = 255 when a

or more when a gain adjustment is made after the
Power Switch has been turned ON.

• Lamp adjustment value is 255 and, at the same
time, the target value cannot be achieved through
gain adjustment.

lamp voltage adjustment is made after the Power
Switch has been turned ON and, at the same time,
the target value cannot be achieved through the
adjustment.

T-39

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

3-2. Detection Timing by Malfunction Code

Code Description Detection Timing

C0000 Main Motor’s failure to turn The Main Motor Lock signal remains faulty for a pre-

determined continuous period of time while the Main
Motor is turning.

C0001 Main Motor turning at

abnormal timing

C0010 Imaging Unit Motor C’s

failure to turn

C0011 Imaging Unit Motor C turn-

ing at abnormal timing

C0012 Imaging Unit Motor M’s

failure to turn

C0013 Imaging Unit Motor M turn-

ing at abnormal timing

C0014 Imaging Unit Motor Y’s fail-

ure to turn

C0015 Imaging Unit Motor Y turn-

ing at abnormal timing

C0016 Imaging Unit Motor Bk’s

failure to turn

C0017 Imaging Unit Motor Bk

turning at abnormal timing

C0040 Fusing Cooling Fan Motor

2’s failure to tu r n

C0046 Fusing Cooling Fan Motor

1’s failure to tu r n

C004C Ozone Ventilation Fan

Motor’s failure to turn

C004E Power Supply Cooling Fan

Motor’s failure to turn

The Main Motor Lock signal remains faulty for a pre­determined continuous period of time while the Main
Motor remains stationary.

The Lock signal remains faulty for a continuous 1­sec. period after the motor rotation has stabilized
and before the motor starts decelerating.

The Lock signal remains faulty for a continuous 1­sec. period after the motor has completely stopped
and before the motor starts accelerating.

The Lock signal remains faulty for a continuous 1­sec. period after the motor rotation has stabilized
and before the motor starts decelerating.

The Lock signal remains faulty for a continuous 1­sec. period after the motor has completely stopped
and before the motor starts accelerating.

The Lock signal remains faulty for a continuous 1­sec. period after the motor rotation has stabilized
and before the motor starts decelerating.

The Lock signal remains faulty for a continuous 1­sec. period after the motor has completely stopped
and before the motor starts accelerating.

The Lock signal remains faulty for a continuous 1­sec. period after the motor rotation has stabilized
and before the motor starts decelerating.

The Lock signal remains faulty for a continuous 1­sec. period after the motor has completely stopped
and before the motor starts accelerating.

A Fusing Cooling Fan Lock signal is detected for a
continuous 3-sec. period while Fusing Cooling Fan
Motor 2 is turning.

A Fusing Cooling Fan Lock signal is detected for a
continuous 3-sec. period while the Fusing Cooling
Fan Motor is turning.

An Ozone Fan Lock signal is detected for a continu­ous 3-sec. period while the Ozone Ventilation Fan
Motor is turning.

A Power Supply Cooling Fan Lock signal is detected
for a continuous 3-sec. period while the Power Sup­ply Cooling Fan Motor is turning.

T-40

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

Code Description Detection Timing

C0060 Fusing Drive Motor’s fail-

ure to turn

C0061 Fusing Drive Motor turn-

ing at abnormal timing

C0094 2nd Image Transfer Roller

pressure/retraction failure

C0096 1st Image Transfer Roller

pressure/retraction failure

C0098 Fusing Roller pressure/

retraction failure

C0200 Cyan PC Drum Charge

Corona malfunction

C0202 Magenta PC Drum Charge

Corona malfunction

C0204 Yellow PC Drum Charge

Corona malfunction

C0206 Blac k PC Drum Charge

Corona malfunction

A Fusing Drive Motor Lock signal remains faulty for a
predetermined continuous period of time while the
Fusing Drive Motor is turning.

The Fusing Drive Motor Lock signal remains faulty
for a predetermined continuous period of time while
the Fusing Drive Motor remains stationary.

• The 2nd Image Transfer Pressure Position Sensor
is not activated (retracted position) within 1 sec.
after the 2nd Image Transfer Roller has started its
retracting motion.

• The 2nd Image Transfer Pressure Position Sensor
is not deactivated (not the retracted position)
within 1 sec. after the 2nd Image Transfer Roller
has started its pressing motion.

• The 1st Image Transfer Retraction Position Sen­sor is not activated (retracted position) within 3
sec. after the 1st Image Transfer Pressure/Retrac­tion Motor has started turning.

• The 1st Image Transfer Retraction Position Sen­sor is not deactivated (pressed position) within 1.5
sec. after the 1st Image Transfer Pressure/Retrac­tion Motor has started turning.

• No change is observed in the encoder pulse even
after the lapse of 0.5 sec. after the Fusing Pres­sure/Retraction Motor has started turning for
retraction direction during retraction control.

• No change is observed in the encoder pulse even
after the lapse of 0.5 sec. after the Fusing Pres­sure/Retraction Motor has started turning for pres­sure direction during pressure control.

• The Fusing Pressure Position Sensor is not acti­vated (pressed position) even when 31 motor
encoder pulses have been counted after the Fus­ing Pressure/Retraction Motor has started turning
for pressure direction during pressure control.

The SCD signal remains inactive for a continuous 1­sec. period while charge corona is being output (i.e.,
the Remote signal is being turned ON).

The SCD signal remains inactive for a continuous 1­sec. period while charge corona is being output (i.e.,
the Remote signal is being turned ON).

The SCD signal remains inactive for a continuous 1­sec. period while charge corona is being output (i.e.,
the Remote signal is being turned ON).

The SCD signal remains inactive for a continuous 1­sec. period while charge corona is being output (i.e.,
the Remote signal is being turned ON).

T-41

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

Code Description Detection Timing

C0400 Exposure Lamp’s failure to

turn ON

C0410 Ex posure Lam p turning

ON at abnormal timing

C0500 Heating Roller warm-up

failure
(Fusing Thermistor 1)

C0501 Lower F using Roller

Heater Lamp warm-up fail­ure
(Fusing Thermistor 2)

C0510 Heating Roller abnormally

low temperature
(Fusing Thermistor 1)

C0511 Lower F using Roller

Heater Lamp abnormally
low temperature
(Fusing Thermistor 2)

C0520 Heating Roller abnormally

high temperature
(Fusing Thermistor 1)

C0521 Lower F using Roller

Heater Lamp abnormally
high temperature
(Fusing Thermistor 2)

A Lamp-Out Detection signal is ON after the lapse of
5 sec. after the Exposure Lamp has been turned ON.

CCD Sensor outputs are written in line RAM at the
end of a scan job and the average of these readings
exceeds a predetermined value.

• Fusing Thermistor 1 does not detect a predeter­mined temperature and the warm-up cycle is not
completed within the period of 9 min. 10 sec. after
the warm-up cycle has been started.

• The temperature of Fusing Thermistor 1 does not
rise to a level more than the predetermined output
value within 30 sec. after the warm-up cycle has
started.

• The temperature of Fusing Thermistor 2 does not
reach 100 °C within 180 sec. after the warm-up
cycle has started.

• The temperature of Fusing Thermistor 1 does not
rise to a level more than the predetermined output
value within 130 sec. after the warm-up cycle has
started.

• The temperature of Fusing Thermistor 1 remains
below 120 °C for 1 sec. or more in the standby
state.

• The temperature of Fusing Thermistor 1 remains
below 130 °C for 1 sec. or more during a print
cycle.

• The temperature of Fusing Thermistor 1 remains
below 90 °C for 1 sec. or more in the Energy
Saver mode.

• The temperature of Fusing Thermistor 2 remains
below 100 °C for 1 sec. or more in the standby
state.

• The temperature of Fusing Thermistor 2 remains
below 100 °C for 1 sec. or more during a print
cycle.

• The temperature of Fusing Thermistor 2 remains
below 100 °C for 1 sec. or more in the Energy
Saver mode.

The temperature of Fusing Thermistor 1 remains
above 220 °C for 1 sec. or more at all times.

The temperature of Fusing Thermistor 2 remains
above 190 °C for 1 sec. or more at all times.

T-42

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

Code Description Detection Timing

C0650 Sc anner Home Sens or

malfunction

C0660 Sc anner overrun failure The Scanner Home Sensor detects the Scanner at

C0990 LCC Lift-Up Motor mal-

function

C0991 LCC Lift 1 ascent motion

failure

C0995 LCC Transport Motor mal-

function

C0999 LCC Lift 2 ascent motion

failure

C0B00 Finishing option transport

drive malfunction

C0B20 Stapling Unit CD drive

malfunction

C0B30 Finishing option Paper

Aligning Bar moving mech­anism malfunction

C0B48 Finishing option Exit Roll

pressure/retraction failure

C0B4A Finishing option Storage

Roller pressure/retraction
failure

• The Scanner Home Sensor fails to detect the
Scanner at its home position though the Scanner
is so located.

• The Scanner Home Sensor fails to detect the
Scanner though the motor has been energized to
move the Scanner over the maximum distance.

• The Scanner Home Sensor detects the Scanner at
its home position though the Scanner has moved
5 mm away from the home position.

its home position during a period from when the
prescan command and scan preparation command
have been executed to when home return command
is executed.

See the relevant Option Service Manual.

T-43

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

Code Description Detection Timing

C0B50 Finishing option stapling

C0B54 Finishing option stapling

C0B73 Finishing option punch

C0B78 Finishing option punch

C0B80 Finishing option Shift

C0BA0 Finishing option Elevator

C0F3A Cyan ATDC Sensor

C0F3B Magenta ATDC Sensor

C0F3C Yellow ATDC Sensor

mechanism 1

mechanism 2

cam motor mechanism
malfunction

selector motor mecha­nism malfunction

Motor mechanism mal­function

Tray drive failure

C0F30 Abnormally low toner den-

sity detected by Cyan
ATDC Sensor

C0F31 Abnormally high toner

density detected by Cyan
ATDC Sensor

C0F32 Abnormally low toner den-

sity detected by Magenta
ATDC Sensor

C0F33 Abnormally high toner

density detected by
Magenta ATDC Sensor

C0F34 Abnormally low toner den-

sity detected by Yellow
ATDC Sensor

C0F35 Abnormally high toner

density detected by Yellow
ATDC Sensor

C0F36 Abnormally low toner den-

sity detected by Black
ATDC Sensor

C0F37 Abnormally high toner

density detected by Black
ATDC Sensor

adjustment failure

adjustment failure

adjustment failure

See the relevant Option Service Manual.

Toner density that is 2 % or more lower than the tar­get level is detected ten consecutive times during a
print cycle, ATVC, or image stabilization sequence.

Toner density that is 4 % or more higher than the tar­get level is detected ten consecutive times during a
print cycle, ATVC, or image stabilization sequence.

Toner density that is 2 % or more lower than the tar­get level is detected ten consecutive times during a
print cycle, ATVC, or image stabilization sequence.

Toner density that is 4 % or more higher than the tar­get level is detected ten consecutive times during a
print cycle, ATVC, or image stabilization sequence.

Toner density that is 2 % or more lower than the tar­get level is detected ten consecutive times during a
print cycle, ATVC, or image stabilization sequence.

Toner density that is 4 % or more higher than the tar­get level is detected ten consecutive times during a
print cycle, ATVC, or image stabilization sequence.

Toner density that is 2 % or more lower than the tar­get level is detected ten consecutive times during a
print cycle, ATVC, or image stabilization sequence.

Toner density that is 4 % or more higher than the tar­get level is detected ten consecutive times during a
print cycle, ATVC, or image stabilization sequence.

Cyan ATDC Sensor adjustment does not function
properly, failing to adjust to an appropriate value.

Magenta ATDC Sensor adjustment does not function
properly, failing to adjust to an appropriate value.

Yellow ATDC Sensor adjustment does not function
properly, failing to adjust to an appropriate value.

T-44

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

Code Description Detection Timing

C0F3D Black ATDC Sensor

adjustment failure

C13C8 New Transfer Belt Unit

resetting failure

C13CA New Fusing Unit resetting

failure

Black ATDC Sensor adjustment does not function
properly, failing to adjust to an appropriate value.

The output from the new unit detecting terminal
remains HIGH and the copier does not recognize
that a new unit has been installed.

1. After an image stabilization sequence is com-

pleted, the fuse blowout signal of the new unit is
set to a blowout state.

2. After the lapse of 2 sec. after step 1, the fuse

blowout signal is brought to a state where no
new units are installed.

3. After the lapse of 0.1 sec. after step 2, a new unit

check sequence is carried out.

A total of three cycles of steps 1 to 3 are carried out
and, if the copier fails to detect a new unit a third
time, a malfunction condition results.

The output from the new unit detecting terminal
remains HIGH and the copier does not recognize
that a new unit has been installed.

1. The fuse blowout signal of the new unit is set to a

blowout state.

2. After the lapse of 0.5 sec. after step 1, the fuse

blowout signal is brought to a state where no
new units are installed.

3. After the lapse of 0.1 sec. after step 2, a new unit

check sequence is carried out.

C13CB New Fusing Web Unit

resetting failure

A total of two cycles of steps 1 to 3 are carried out
and, if the copier fails to detect a new unit a second
time, a malfunction condition results.

The output from the new unit detecting terminal
remains HIGH and the copier does not recognize
that a new unit has been installed.

1. The fuse blowout signal of the new unit is set to a

blowout state.

2. After the lapse of 0.5 sec. after step 1, the fuse

blowout signal is brought to a state where no
new units are installed.

3. After the lapse of 0.1 sec. after step 2, a new unit

check sequence is carried out.

A total of two cycles of steps 1 to 3 are carried out
and, if the copier fails to detect a new unit a second
time, a malfunction condition results.

T-45

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

Code Description Detection Timing

C13CC New Oil Coating Unit

resetting failure

C13D1 Cyan IU EEPROM failure EEPROM access error:

C13D2 Magenta IU EEPROM fail-

ure

C13D3 Yellow IU EEPROM failure EEPROM access error:

C13D4 Black IU EEPROM failure EEPROM access error:

C3310 CCD clamp /gain adjust-

ment failure

C3700 IR Cooling Fan Motor 1

turning at abnormal timing

The output from the new unit detecting terminal
remains HIGH and the copier does not recognize
that a new unit has been installed.

1. The fuse blowout signal of the new unit is set to a

blowout state.

2. After the lapse of 0.5 sec. after step 1, the fuse

blowout signal is brought to a state where no
new units are installed.

3. After the lapse of 0.1 sec. after step 2, a new unit

check sequence is carried out.

A total of two cycles of steps 1 to 3 are carried out
and, if the copier fails to detect a new unit a second
time, a malfunction condition results.

When EEPROM access control is executed, setting
1 “Start Flag” of GA register does not become ready
even after the lapse of a predetermined period of
time.

EEPROM access error:
When EEPROM access control is executed, setting
1 “Start Flag” of GA register does not become ready
even after the lapse of a predetermined period of
time.

When EEPROM access control is executed, setting
1 “Start Flag” of GA register does not become ready
even after the lapse of a predetermined period of
time.

When EEPROM access control is executed, setting
1 “Start Flag” of GA register does not become ready
even after the lapse of a predetermined period of
time.

• When clamp adjustment is made:
(AVE1 - AVE2) = < 4

• When gain adjustment is made:
The average of CCD Sensor output values is 1 or
less.
Dgain = 0
Dgain = 25 5

A Lock signal is detected ten consecutive times
when it is monitored at 0.01-sec. intervals while a
Fan Motor ON signal is being output and, at the
same time, after the lapse of 2 sec. or more after the
output of the Fan Motor ON signal has been started.

T-46

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

Code Description Detection Timing

C3710 IR Cooling Fan Motor 2

turning at abnormal timing

C3720 Original Glass Cooling Fan

Motor turning at abnormal
timing

C3A00 PIC communication error • A sampling lock is not received after the lapse of a

C3A01 PIC Board malfunction The PIC Board is faulty.
C3FFF ROM contents fault

detected upon start

A Lock signal is detected ten consecutive times
when it is monitored at 0.01-sec. intervals while a
Fan Motor ON signal is being output and, at the
same time, after the lapse of 2 sec. or more after the
output of the Fan Motor ON signal has been started.

A Lock signal is detected ten consecutive times
when it is monitored at 0.01-sec. intervals while a
Fan Motor ON signal is being output and, at the
same time, after the lapse of 2 sec. or more after the
output of the Fan Motor ON signal has been started.

predetermined period of time after IREQ has been
received during AIDC sampling of image stabiliza­tion sequence or registration adjustment.

• There is an open-circuit in the communication har­ness between the PIC Board and Master Board.

• Either the PIC Board or Master Board is faulty.

The system fails to rewrite flash memory during
updating.

T-47

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

3-3. Troubleshooting Procedures by Malfunction Code

(1) C0000: Main Motor’s failure to turn

C0001: Main Motor turning at abnormal timing

Relevant Electrical Parts

Main Motor (M13) Master Board (PWB-I)

DC Power Supply 1 (PU1)

PU1

PJ7PU1-4(DC24 V)
PJ7PU1-5(GND)

PWB-I

M13

PJ105

1
2
3
4
5
6
7
8

PJ13I-7A(M13 LOCK)
PJ13I-8A(M13 REM)

PJ13I-9A(M13 CLK)
PJ13I-10A(DC5 V)
PJ13I-11A(GND)
PJ13I-12A(M13 CW/CCW)

C0000: Main Motor’s failure to tu rn

Step Check Item Result Action

1 Main Motor turns when the Start key is

pressed.

NO Check connector for connec -

tion. Correct drive coupling
(drive transmitting gear
engagement).

2 Main Motor rotation when the Start key is

pressed: the voltage across PJ13I-7A on
Master Board and GND is DC 5 V when the

YES Change motor.

NO Change Master Board.

motor is deenergized and DC 0 V when the
motor is energized.

3 Main Motor rotation when the Start key is

NO Change DC Power Supply 1.
pressed: the voltage across PJ7PU1-4 on
DC Power Supply 1 and GND is DC 0 V
when the motor is deenergized and DC 24
V when the motor is energized.

C0001: Main Motor turning at abnormal timing

Step Check Item Result Action

1 Main Motor rotation while it is being ener-

gized: the voltage across PJ13I-7A on Mas­ter Board and GND remains DC 0 V.

YES Change Master Board.

NO Change motor.

4004C01TAA

T-48

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(2) C0010: Imaging Unit Motor C’s failure to turn

C0011: Imaging Unit Motor C turning at abnormal timing
C0012: Imaging Unit Motor M’s failure to turn
C0013: Imaging Unit Motor M turning at abnormal timing
C0014: Imaging Unit Motor Y’s failure to turn
C0015: Imaging Unit Motor Y turning at abnormal timing
C0016: Imaging Unit Motor Bk’s failure to turn
C0017: Imaging Unit Motor Bk turning at abnormal timing

Relevant Electrical Parts

Imaging Unit Motor C (M17)
Imaging Unit Motor M (M16)
Imaging Unit Motor Y (M15)

Imaging Unit Motor Bk (M18)
Master Board (PWB-I)
DC Power Supply 1 (PU1)

M15

CL11

M16

CL12

M17

CL13

M18

CL14

PJ1Y-1(DC5V)

PJ1Y-2(GMD)

PJ1Y-3(DC24 V)

PJ1Y-4(GND)

M15

PJ2Y-1(M15 REM)

PJ2Y-2(M15 LOCK)

PJ2Y-3(Speed CHG)

PJ2Y-4(CL11 REM)

PJ1M-1(DC5V)

PJ1M-2(GMD)

PJ1M-3(DC24 V)

PJ1M-4(GND)

M16

PJ2M-1(M16 REM)

PJ2M-2(M16 LOCK)

PJ2M-3(Speed CHG)

PJ2M-4(CL12 REM)

PJ1C-1(DC5V)

PJ1C-2(GND)

PJ1C-3(DC24 V)

PJ1C-4(GND)

M17

PJ2C-1(M17 REM)

PJ2C-2(M17 LOCK)

PJ2C-3(Speed CHG)

PJ2C-4(CL13 REM)

PJ1K-1(DC5V)

PJ1K-2(GND)

PJ1K-3(DC24 V)

PJ1K-4(GND)

M18

PJ2K-1(M18 REM)

PJ2K-2(M18 LOCK)

PJ2K-3(Speed CHG)

PJ2K-4(CL14 REM)

PU1

PJ8PU1-4(DC5V)
PJ8PU1-3(GND)
PJ7PU1-2(DC24 V)
PJ7PU1-6(GND)

PWB-I

PJ12I-4A(M15 REM)
PJ12I-3A(M15 LOCK)
PJ12I-2A(Speed CHG)
PJ12I-1A(CL11 REM)

PU1

PJ8PU1-4(DC5V)
PJ8PU1-3(GND)
PJ7PU1-2(DC24 V)
PJ7PU1-7(GND)

PWB-I

PJ12I-8A(M16 REM)
PJ12I-7A(M16 LOCK)
PJ12I-6A(Speed CHG)
PJ12I-5A(CL12 REM)

PU1

PJ8PU1-4(DC5V)
PJ8PU1-3(GND)
PJ7PU1-3(DC24 V)
PJ7PU1-8(GND)

PWB-I

PJ12I-4B(M17 REM)
PJ12I-3B(M17 LOCK)
PJ12I-2B(Speed CHG)
PJ12I-1B(CL13 REM)

PU1

PJ8PU1-4(DC5V)
PJ8PU1-3(GND)
PJ7PU1-3(DC24 V)
PJ7PU1-9(GND)

PWB-I

PJ12I-8B(M18 REM)
PJ12I-7B(M18 LOCK)
PJ12I-6B(Speed CHG)
PJ12I-5B(CL14 REM)

4004C02TAD

T-49

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

C0010, C0012, C0014, C0016

Step Check Item Result Action

1 Imaging Unit Motor turns when the Start key

is pressed.

2 Imaging Unit Motor rotation when the Start

key is pressed:
Cyan: the voltage across PJ12I-3B on Mas­ter Board and GND is DC 5 V when the
motor is deenergized and DC 0 V when the
motor is energized.
Magenta: the voltage across PJ12I-7A on
Master Board and GND is DC 5 V when the
motor is deenergized and DC 0 V when the
motor is energized.
Yellow: the voltage across PJ12I-3A on
Master Board and GND is DC 5 V when the
motor is deenergized and DC 0 V when the
motor is energized.
Black: the voltage across PJ12I-7B on Mas­ter Board and GND is DC 5 V when the
motor is deenergized and DC 0 V when the
motor is energized.

NO Correct drive coupling (drive

transmitting gear engage­ment, coupling engagement).
Check that the LED Assy is
locked in position.

YES Change motor.

NO Change Master Board.

C0011, C0013, C0015, C0017

Step Check Item Result Action

1 Imaging Unit Motor rotation while it is being

energized:
Cyan: the voltage across PJ12I-3B on Mas­ter Board and GND remains DC 0 V.
Magenta: the voltage across PJ12I-7A on
Master Board and GND remains DC 0 V.
Yellow: the voltage across PJ12I-3A on
Master Board and GND remains DC 0 V.
Black: the voltage across PJ12I-7B on Mas­ter Board and GND remains DC 0 V.

YES Change Master Board.

NO Change motor.

T-50

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(3) C0040: Fusing Cooling Fan Motor 1’s failure to turn

C0046: Fusing Cooling Fan Motor 2’s failure to turn
C004C: Ozone Ventilation Fan Motor’s failure to turn
C004E: Power Supply Cooling Fan Motor’s failure to turn

Relevant Electrical Parts

Fusing Cooling Fan Motor 1 (M23)
Fusing Cooling Fan Motor 2 (M24)
Ozone Ventilation Fan Motor (M22)

Power Supply Cooling Fan Motor (M21)
High Voltage Unit 3 (HV3)
Master Board (PWB-I)
DC Power Supply 1 (PU1)

M21

CN77

1
2
3

3
2
1

PU1

PJ13PU1-1(DC24 V)
PJ13PU1-2(GND)
PJ13PU1-3(M21 LOCK)

PJ6PU1-1(DC24 V)
PJ6PU1-2(DC24 V)

PJ6PU1-8(GND)
PJ6PU1-9(GND)

PWB-I

PJ1I-2
PJ1I-3
PJ1I-4
PJ1I-5

HV3

M22

CN2HV3-1(M22 ON)
CN2HV3-2(GND)
CN2HV3-3(M22 LOCK)

CN1HV3-1(M22 LOCK)

CN1HV3-2(M22 ON)

CN65

7

1

6

2

5

3

4

4

3

5

2

6

1

7

M23

M24

CN31

1
2
3

CN80

1
2
3

3
2
1

3
2
1

C0040

Step Check Item Result Action

1 Fusing Cooling Fan Motor 1 turns when the

NO Check connector for connec ­Start key is pressed.

2 Fusing Cooling Fan Motor 1 rotation when

the Start key is pressed: the voltage across
PJ14I-13A on Master Board and GND is DC

YES Change Master Board.

NO Change motor.
5 V when the motor is deenergized and DC

0 V when the motor is energized.

PJ10I-15(M22 LOCK)
PJ10I-14(M22 ON)

PJ14I-11A(M23 ON)
PJ14I-12A(GND)
PJ14I-13A(M23 LOCK)

PJ14I-1A(M24 ON)
PJ14I-2A(GND)
PJ14I-3A(M24 LOCK)

4004C03TAC

tion. Check fan for overload.

4004C03TAC

T-51

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

C0046

Step Check Item Result Action

1 Fusing Cooling Fan Motor 2 turns when the

Start key is pressed.

2 Fusing Cooling Fan Motor 2 rotation when

the Start key is pressed: the voltage across
PJ14I-3A on Master Board and GND is DC
5 V when the motor is deenergized and DC
0 V when the motor is energized.

C004C

Step Check Item Result Action

1 Ozone Ventilation Fan Motor turns when

the Start key is pressed.

2 Ozone Ventilation Fan Motor rotation when

the Start key is pressed: the voltage across
PJ10I-15 on Master Board and GND is DC
5 V when the motor is deenergized and DC
0 V when the motor is energized.

3 Ozone Ventilation Fan Motor rotation when

the Start key is pressed: the voltage across
CN2HV3-3 on High Voltage Unit 3 and
GND is DC 5 V when the motor is deener­gized and DC 0 V when the motor is ener­gized.

NO Check connector for connec -

tion. Check fan for overload.

YES Change motor.

NO Change Master Board.

NO Check connector for connec -

tion. Check fan for overload.

NO Change Master Board.

YES Change motor.

NO Change High Voltage Unit 3.

C004E

Step Check Item Result Action

1 Power Supply Cooling Fan Motor turns

when the Start key is pressed.

2 Power Supply Cooling Fan Motor rotation

when the Start key is pressed: the voltage
across PJ13PU1-3 on DC Power Supply 1
and GND is DC 5 V when the motor is
deenergized and DC 0 V when the motor is
energized.

NO Check connector for connec -

tion. Check fan for overload.

YES Change motor.

NO Change DC Power Supply 1.

T-52

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(4) C0060: Fusing Drive Motor’s failure to turn

C0061: Fusing Drive Motor turning at abnormal timing

Relevant Electrical Parts

Fusing Drive Motor (M14) Master Board (PWB-I)

DC Power Supply 1 (PU1)

PU1

PJ7PU1-4(DC24 V)
PJ7PU1-5(GND)

PJ106

1
2

M14

C0060

Step Check Item Result Action

1 Fusing Drive Motor turns when the Start key

is pressed.

2 Fusing Drive Motor rotation when the Start

key is pressed: the voltage across PJ13I-1A
on Master Board and GND is DC 5 V when
the motor is deenergized and DC 0 V when
the motor is energized.

3 Fusing Drive Motor rotation when the Start

key is pressed: the voltage across PJ7PU1­4 on DC Power Supply 1 and GND is DC 0
V when the motor is deenergized and DC
24 V when the motor is energized.

3
4
5
6
7
8
9

PWB-I

PJ13I-1A(M14 LOCK)
PJ13I-2A(M14 REM)

PJ13I-3A(M14 CLK)
PJ13I-4A(DC5 V)
PJ13I-5A(GND)
PJ13I-6A(M14 CCW/CW)

NO Check connector for connec -

tion. Correct drive coupling
(drive transmitting gear
engagement).

YES Change motor.

NO Change Master Board.

NO Change DC Power Supply 1.

4004C04TAA

C0061

Step Check Item Result Action

1 Fusing Drive Motor rotation while it is being

energized: the voltage across PJ13I-1A on
Master Board and GND remains DC 0 V.

YES Change Master Board.

NO Change motor.

T-53

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(5) C0094: 2nd Image Transfer Roller pressure/retraction failure

Relevant Electrical Parts

2nd Image Transfer Pressure Position Sen­sor (PC23)
2nd Image Transfer Pressure/Retraction
Clutch (CL15)

Master Board (PWB-I)

CN14

122

CN63

CL15

PJ122

4
3
2
1

PJ108

3
2

PC23

C0094

Step Check Item Result Action

1 While the 2nd Image Transfer Pressure/

Retraction Clutch is supposed to be deener­gized during timing of pressure/retraction
operation: the voltage across PJ14I-9A on
Master Board and GND is DC 24 V when
the clutch is deenergized and DC 0 V when
the clutch is energized.

2 I/O check for 2nd Image Transfer Pressure

Position Sensor operation during pressure/
retraction operation: the voltage across
PJ14I-6B on Master Board and GND is DC
0 V when the sensor is unblocked and DC 5
V when the sensor is blocked (pressed
position).

1

12

1

1

12

4

9
58
67

1

CN65

1
2

6

771

PWB-I

PJ14I-9A(DC24 V)
PJ14I-10A(CL15 REM)

PJ14I-4B(DC5 V)
PJ14I-5B(GND)
PJ14I-6B(PC23 ON)

YES Check connector for connec-

tion. Check for overload.
Change clutch.

NO Change Master Board.

YES Change Master Board.

NO Correct actuator. Check sen-

sor connector for connection.
Change sensor.

4004C05TAB

T-54

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(6) C0096: Image Transfer Belt pressure/retraction failure

Relevant Electrical Parts

1st Image Transfer Retraction Position Sen­sor (PC28)
1st Image Transfer Pressure/Retraction
Motor (M11)

Master Board (PWB-I)

M11

CN46

1
2
3
4
5
6

6
5
4
3
2
1

PWB-I

PJ16I-2B(DC24 V)
PJ16I-3B(DC24 V)
PJ16I-4B(M11 A1)
PJ16I-5B(M11 B1)
PJ16I-6B(M11 A3)
PJ16I-7B(M11 B3)

PJ109

3
2

PC28

C0096

Step Check Item Result Action

1 1st Image Transfer Pressure/Retraction

Motor turns during pressure/retraction oper­ation.

2 I/O check for 1st Image Transfer Retraction

Position Sensor operation during pressure/
retraction operation: the voltage across
PJ17I-1A on Master Board and GND is DC
0 V when the sensor is unblocked and DC 5
V when the sensor is blocked (retracted
position).

1

PJ17I-1A(PC28 ON)
PJ17I-2A(DC5 V)
PJ17I-3A(GND)

NO Check connector for connec -

tion. Correct drive coupling
(drive transmitting gear
engagement). Change motor.
Change Master Board.

YES Change Master Board.

NO Correct actuator. Check sen-

sor connector for connection.
Change sensor.

4004C06TAA

T-55

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

0

01.02.09

(7) C0098: Fusing Roller pressure/retraction failure

Relevant Electrical Parts

Fusing Pressure Position Sensor (PC7)
Fusing Retraction Position Sensor (PC8)

Fusing Pressure/Retraction Motor (M8)
Master Board (PWB-I)

CN4

1
2
3
454

24

1
2
3

5

24

PC7

PJ136

3
2
1

PJ120

M8

2
1

PWB-I

PJ6I-9B(DC5 V)
PJ6I-10B(GND)
PJ6I-11B(PC7 ON)

PJ14I-4A(M8 -)
PJ14I-5A(M8 +)

PC8

PJ134

3
2
1

PJ17I-1B(DC5 V)
PJ17I-2B(GND)
PJ17I-3B(PC8 ON)

4

4004C07TAC

T-56

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

C0098

Step Check Item Result Action

1 Fusing Pressure/Retraction Motor rotation

when the Fusing Roller is retracted: the
voltage across PJ14I-4A on Master Board
and GND is DC 0 V when the motor is
deenergized and DC 24 V when the motor
is energized.

2 I/O check for Fusing Pressure Position Sen-

sor when the Fusing Roller is retracted: the
voltage across PJ6I-11B on Master Board
and GND is DC 0 V when the sensor is
unblocked (retracted position) and DC 5 V
when the sensor is blocked.

3 Fusing Pressure/Retraction Motor rotation

when the Fusing Roller is pressed: the volt­age across PJ14I-5A on Master Board and
GND is DC 0 V when the motor is deener­gized and DC 24 V when the motor is ener­gized.

4 I/O check for Fusing Pressure Position Sen-

sor when the Fusing Roller is pressed: the
voltage across PJ6I-11B on Master Board
and GND is DC 0 V when the sensor is
unblocked and DC 5 V when the sensor is
blocked (pressed position).

5 I/O check for Fusing Retraction Position

Sensor operation while the Fusing Pres­sure/Retraction Motor is turning: the voltage
across PJ17I-3B on Master Board and GND
remains DC 0 V when the sensor is
unblocked or remains DC 5 V when the
sensor is blocked while the motor remains
stationary, and alternates between DC 0 V
when the sensor is unblocked and DC 5 V
when the sensor is blocked while the motor
is turning.

YES Check motor connector for

connection. Change motor.

NO Change Master Board.

YES Change Master Board.

NO Check sensor installation.

Correct detecting plate.
Check sensor connector for
connection. Change sensor.

NO Change Master Board.

YES Change Master Board.

NO Check sensor installation.

Correct detecting plate.
Check sensor connector for
connection. Change sensor.

YES Change Master Board.

NO Check sensor installation.

Correct detecting plate.
Check sensor connector for
connection. Change sensor.

T-57

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(8) C0200: Cyan PC Drum Charge Corona malfunction

C0202: Magenta PC Drum Charge Corona malfunction
C0204: Yellow PC Drum Charge Corona malfunction
C0206: Black PC Drum Charge Corona malfunction

Relevant Electrical Parts

Imaging Unit C
Imaging Unit M
Imaging Unit Y

High Voltage Unit 1 (HV1)
Master Board (PWB-I)
DC Power Supply 1 (PU1)

Imaging Unit Bk

HV1

PJ16-1(DC 24V)

PJ16-2(GND)

PJ17-12
PJ17-11
PJ17-10

PJ17-9
PJ17-8
PJ17-7
PJ17-6
PJ17-5
PJ17-4
PJ17-3
PJ17-2
PJ17-1

PU1

PJ6PU1-4(DC24 V)
PJ6PU1-5(GND)

PWB-I

PJ9I-1(G CNT-K)
PJ9I-2(G CNT-C)
PJ9I-3(G CNT-M)
PJ9I-4(G CNT-Y)
PJ9I-5(D.C SCD-Y)
PJ9I-6(D.C REM-Y)
PJ9I-7(D.C SCD-M)
PJ9I-8(D.C REM-M)
PJ9I-9(D.C SCD-C)
PJ9I-10(D.C REM-C)
PJ9I-11(D.C SCD-K)
PJ9I-12(D.C REM-K)

4004C08TAB

T-58

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

C0200, C0202, C0204, C0206

Step Check Item Result Action

1 Imaging Unit contact failure YES Correct or clean Imaging Unit

contact.

2 High Voltage Unit 1 contact failure YES Correct or clean High Voltage

3 After corona output has been turned ON:

Cyan (C0200):
The voltage across PJ9I-10 on Master
Board and GND is DC 24 V when the output
is turned OFF and DC 0 V when the output
is turned ON.
Magenta (C0202):
The voltage across PJ9I-8 on Master Board
and GND is DC 24 V when the output is
turned OFF and DC 0 V when the output is
turned ON.
Yellow (C0204):
The voltage across PJ9I-6 on Master Board
and GND is DC 24 V when the output is
turned OFF and DC 0 V when the output is
turned ON.
Bk (C0206):
The voltage across PJ9I-12 on Master
Board and GND is DC 24 V when the output
is turned OFF and DC 0 V when the output
is turned ON.

Unit 1 contact.

YES Change High Voltage Unit 1.

NO Change Master Board.

T-59

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(9) C0400: Exposure Lamp’s failure to turn ON

C0410: Exposure Lamp turning ON at abnormal timing

Relevant Electrical Parts

Exposure Lamp (LA1)
Flat Cable (PWB-Z)

Temperature Fuse (F4)
DC Power Supply 2 (PU2)
Image Processing Board (PWB-C)

PWB-Z PWB-Z PU2

PJ8

12

F4

LA1

PJ2Z-5

PJ7

PJ2Z-3

PJ1Z-1

PJ1Z-3

PJ2PU2-1(DC0 V)

PJ2PU2-3(DC70 V)

PJ3PU2-1(DC24 V)

PJ3PU2-2(GND)

PJ3PU2-3(Lamp REM)

PJ3PU2-4(Lamp Down)

PJ3PU2-5(Lamp CNT)

PWB-C

PJ2C-11B
PJ2C-10B
PJ2C-9B
PJ2C-8B
PJ2C-7B

4004C09TAB

C0400/C0410

Step Check Item Result Action

1 Exposure Lamp conduction NO Change Exposure Lamp.
2 Temperature Fuse conduction NO Change Temperature Fuse.
3 Flat Cable conduction NO Check for correct installation

or change.

4 The problem has been eliminated through

NO Change DC Power Supply 2.

the checks of steps up to 3.

5 Exposure Lamp turns ON and OFF cor-

rectly after DC Power Supply 2 has been

NO Change Image Processing

Board.

replaced.

T-60

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(10) C0500: Heating Roller warm-up failure

C0501: Lower Fusing Roller Heater Lamp warm-up failure
C0510: Heating Roller abnormally low temperature
C0511: Lower Fusing Roller Heater Lamp abnormally low temperature
C0520: Heating Roller abnormally high temperature
C0521: Lower Fusing Roller Heater Lamp abnormally high temperature

Relevant Electrical Parts

Fusing Unit DC Power Supply 1 (PU1)

Master Board (PWB-I)

FUSING

UNIT

CN4

1121

13 13
14
15
16
17 17
18 18

24

PU1

PJ12PU1-2(H1 ON)
PJ12PU1-3(H2 ON)
PJ12PU1-4(H3 ON)

PJ4PU1-1(L)
12
14

15
16

24

PJ4PU1-2(N H1)

PJ4PU1-3(N H2)

PJ4PU1-4(N H3)

PWB-I

PJ6I-1B(TH1 ON)

PJ6I-2B(GND)

PJ6I-3B(TH2 ON)

PJ6I-4B(GND)

PJ2I-8(H3 ON)
PJ2I-9(H2 ON)

PJ2I-10(H1 ON)

4004C27TAC

T-61

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

C0500, C0510

Step Check Item Result Action

1 Fusing Unit condition: the resistance across

CN4-15 and 16 on the Fusing Unit end is
infinity with CN4 (2P) disconnected.

2 Heating Roller Heater Lamps turn ON. YES Change DC Power Supply 1.

C0520

Step Check Item Result Action

1 Fusing Unit condition: the resistance across

CN4-15 and 16 on the Fusing Unit end is 0

Ω

(or close to 0) with CN4 (2P) discon-

nected.

C0501, C0511

Step Check Item Result Action

1 Fusing Unit condition: the resistance across

CN4-17 and 18 on the Fusing Unit end is
infinity with CN4 (2P) disconnected.

2 Lower Fusing Roller Heater Lamp turns ON. YES Change DC Power Supply 1.

YES Change Fusing Unit.

NO Change Master Board.

Change Master Board.

NO Change Fusing Unit.

YES Change Fusing Unit.

NO Change Master Board.

YES Change Fusing Unit.

NO Change Master Board.

Change Master Board.

NO Change Fusing Unit.

C0521

Step Check Item Result Action

1 Fusing Unit condition: the resistance across

CN4-15 and 16 on the Fusing Unit end is 0

Ω

(or close to 0) with CN4 (2P) discon-

nected.

YES Change Fusing Unit.

NO Change Master Board.

T-62

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(11) C0650: Scanner Home Sensor malfunction

C0660: Scanner overrun failure

Relevant Electrical Parts

Scanner Home Sensor (PC24)
Scanner Motor (M1)

Scanner Motor Drive Board (PWB-IC)
DC Power Supply 2 (PU2)
Image Processing Board (PWB-C)

M1

PC24

PJ38

1
2
3

PJ26

3
2
1

PWB-IC

PJ1IC-1
PJ1IC-2
PJ1IC-3
PJ1IC-4

PJ2IC-1
PJ2IC-2
PJ2IC-3
PJ2IC-4
PJ2IC-5
PJ2IC-6
PJ2IC-7
PJ2IC-8

PJ3IC-1(U)
PJ3IC-2(V)
PJ3IC-3(W)

PU2

PJ6PU2-2(DC5 V)
PJ6PU2-4(GND)
PJ6PU2-7(DC24 V)
PJ6PU2-6(GND)

PWB-C

PJ2C-9A(GND)
PJ2C-8A(RESET)
PJ2C-7A(ENABLE)
PJ2C-6A(M1 CRNT SW2)
PJ2C-5A(M1 CRNT SW1)
PJ2C-4A(HOLD)
PJ2C-2A(CW/CCW)
PJ2C-1A(CLK)

PJ6C-1(GND)
PJ6C-2(DC24V)
PJ6C-3(DC 5V)

4004C11TAA

4004C11TAA

T-63

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

C0650, C0660

Step Check Item Result Action

1 Scanner can be moved manually. NO Correct drive coupling (Scan-

ner Belt tension, pulley opera­tion, drive cable tension)

2 Scan motion: initial scan motion after the

Power Switch has been turned ON or Front
Door has been opened and closed.

3 Connectors are connected properly on

Scanner Motor Drive Board: PWB-IC
PJ1IC, PJ2IC, and PJ3IC.

4 Scanner Motor turns when the Start key is

pressed.

5 I/O check for Scanner Home Sensor: the

voltage across PJ6C-2 on Image Process­ing Board and GND is DC 0 V (home posi­tion) when the sensor is blocked and DC 5
V when the sensor is unblocked.

6 “IR Area” check:

Malfunction when Power Switch is turned
ON after “Top Image” has been set to 0 and
“FD-Mag.” to 1.000.

NO Carry out misfeed/malfunction

troubleshooting procedures.

NO Check connectors f or connec-

tion.

NO Check connectors f or connec-

tion. Change motor. Change
Scanner Motor Drive Board.

YES Change Image Processing

Board.

NO Check sensor for installation.

Correct detecting plate.
Check sensor connector for
connection. Change sensor.

NO Adjust “IR Area” data.

T-64

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(12) C0990: LCC Lift-Up Motor malfunction

C0991: LCC Lift 1 ascent motion failure
C0995: LCC Transport Motor malfunction
C0999: LCC Lift 2 ascent motion failure

Relevant Electrical Parts

LCC Set Sensor (FRONT)
Lift-Up Sensor 1 (LS1)
Lift-Up Sensor 2 (LS2)

LCC Transport Motor (HMOT)
LCC Lift-Up Motor (EMOT)
LCC Control Board (PWB-A)

LS1

LS2

E MOT

H MOT

FRONT

PJ3

1
2
3
4
5
6

PJ6

1
2
3

PJ5

1
2
3

PJ1

1
2
3

CN17

211

2

PWB-A

CN4A-6(LS1 ON)
CN4A-5(GND)
CN4A-4(DC5 V)

CN4A-9(LS2 ON)
CN4A-8(GND)
CN4A-7(DC5 V)

CN5A-2(E MOT/CCW)
CN5A-1(E MOT/CW)

CN6A-6(H MOT CLK)
CN6A-5(DC5 V)
CN6A-4(H MOT SIG)
CN6A-3(GND)

CN6A-1(DC24 V)

CN6A-9(FRONT ON)
CN6A-8(GND)
CN6A-7(DC5 V)

T-65

4004C12TAA

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

C0990

Step Check Item Result Action

1 LCC Lift-Up Motor turns after the LCC

Drawer has been slid into position while the
LCC Drawer is being used.

C0991

Step Check Item Result Action

1 Lift 1 ascends after the LCC Lift-Up Motor

has been energized.

2 I/O check for Lift-Up Sensor 1 operation:

the voltage across CN4A-6 on LCC Control
Board and GND is DC 0 V when the sensor
is unblocked and DC 5 V when the sensor
is blocked (during lifting motion detection).

C0995

NO Change motor. Change LCC

Control Board.

NO Correct drive coupling (one-

way gear engagement, cou­pling engagement, spring
operation, and belt tension).

YES Change LCC Control Board.

NO Check sensor for installation.

Check sensor connector for
connection. Change sensor.

Step Check Item Result Action

1 LCC Lift-Up Motor turns when the Start key

is pressed while the LCC Drawer is being
used.

C0999

Step Check Item Result Action

1 Lift 2 ascends after the LCC Lift-Up Motor

has been energized.

2 I/O check for Lift-Up Sensor 2 operation:

the voltage across CN4A-9 on LCC Control
Board and GND is DC 0 V when the sensor
is unblocked and DC 5 V when the sensor
is blocked (during lifting motion detection).

NO Change motor. Change LCC

Control Board.

NO Correct drive coupling (one-

way gear engagement, cou­pling engagement, spring
operation, and belt tension).

YES Change LCC Control Board.

NO Check sensor for installation.

Check sensor connector for
connection. Change sensor.

T-66

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(13) C0F30: Abnormally low toner density detected by Cyan ATDC Sensor/

C0F31: Abnormally high toner dens ity detected by Cyan ATDC Sensor
C0F32: Abnormally low toner density detected by Magenta ATDC Sensor/
C0F33: Abnormally high toner de ns ity detected by Magenta ATDC Sensor
C0F34: Abnormally low toner density detected by Yellow ATDC Sensor/
C0F35: Abnormally high toner de ns ity detected by Yellow ATDC Sensor

Relevant Electrical Parts

ATDC Sensor C (PWB-N3)
ATDC Sensor M (PWB-N2)
ATDC Sensor Y (PWB-N1)

Toner Replenishing Motor C/Bk (M9)
Toner Replenishing Motor Y/M (M10)
Master Board (PWB-I)

CN72

1041

7

38
29
110

PWB-I

–

PJ5I-7A(

A-A1
PJ5I-8A(A-A3)

–

PJ5I-9A(

B-B1

PJ5I-10A(B-B3)

)
)

M10

CN35

2

431
23

14

CN36

–

PJ5I-1B(

A-A1

PJ5I-2B(A-A3)

–

PJ5I-3B(

B-B1

PJ5I-4B(B-B3)

)
)

M9

431

2

23
14

PWB-N1

PJ88N1-4(TH1 OUT)

PJ88N1-3(GND)

PJ88N1-2(DC5 V)

PJ88N1-1(UN33 REM)

PWB-N2

PJ89N2-4(TH2OUT)

PJ89N2-3(GND)

PJ89N2-2(DC5 V)

PJ89N2-1(UN34 REM)

PWB-N3

PJ90N3-4(TH3 OUT)

PJ90N3-3(GND)

PJ90N3-2(DC5 V)

PJ90N3-1(UN35 REM)

T-67

CN50

2

12111
103

94
85
76
67
58
49
310
211
112

PJ7I-1A(TH1 OUT)
PJ7I-2A(GND)
PJ7I-3A(DC5 V)
PJ7I-4A(UN33 REM)
PJ7I-5A(TH2 OUT)
PJ7I-6A(GND)
PJ7I-7A(DC5 V)
PJ7I-8A(UN34 REM)
PJ7I-9A(TH3 OUT)
PJ7I-10A(GND)
PJ7I-11A(DC5 V)
PJ7I-12A(UN35 REM)

4004C13TAA

4004C13TAA

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

C0F30, C0F32, C0F34

Step Check Item Result Action

1 ATDC Sensor window is dirty. YES Clean.
2 ATDC Sensor spring moving part operates

properly.
3 Hopper supplies toner properly. NO Correct.
4 ATDC Sensor LED is dirty. YES Clean.
5 ATDC Sensor LED emits light properly. NO Check connector for connec-

6 Imaging Unit Shutter operates properly. NO Cor rect .
7 The problem has been eliminated through

the checks of steps up to 6.

C0F31, C0F33, C0F35

Step Check Item Result Action

1 ATDC Sensor window is dirty. YES Clean.
2 Bias voltage is properly applied to the

ATDC Sensor window.
3 The problem has been eliminated through

the checks of steps up to 2.

NO Correct.

tion. Check harness.

NO Change Master Board.

NO Check wiring.

NO Change Master Board.

T-68

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(14) C0F36: Abnormally low toner density detected by Black ATDC Sensor/

C0F37: Abnormally high toner density detected by Black ATDC Sensor

Relevant Electrical Parts

Imaging Unit Bk

Master Board (PWB-I)

Toner Replenishing Motor C/Bk (M9)

M9

Imaging Unit

(Bk)

CN36

2

431
23

14

PWB-I

–

PJ5I-1B(

A-A1

PJ5I-2B(A-A3)

–

PJ5I-3B(

B-B1

PJ5I-4B(B-B3)

PJ13I-4B
PJ13I-3B
PJ13I-5B
PJ13I-6B

)
)

C0F36

Step Check Item Result Action

1 Image density is low. YES Check and correct Imaging

Unit Bk Shutter.

2 The problem has been eliminated through

NO Check and correct Hopper.

the check of step 1.
3 The problem has been eliminated through

NO Change Master Board.

the check of step 2.

C0F37

Step Check Item Result Action

1 Imaging Unit Bk is installed correctly. NO Reinstall.
2 Each of Imaging Unit Bk contacts makes

NO Clean or correct.

good contact.
3 ATDC Sensor harness is open-circuited. YES Chang e Imaging Unit Bk.

4004C26TAB

T-69

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(15) C0F3A: Cyan ATDC Sensor adjustment failure

C0F3B: Magenta ATDC Sensor adjustment failure
C0F3C: Yellow ATDC Sensor adjustment failure
C0F3D: Black ATDC Sensor adjustment failure

Relevant Electrical Parts

ATDC Sensor C (PWB-N3)
ATDC Sensor M (PWB-N2)
ATDC Sensor Y (PWB-N1)

Toner Replenishing Motor C/Bk (M9)
Toner Replenishing Motor Y/M (M10)
Master Board (PWB-I)

Imaging Unit Bk

CN72

1041

7

431

38

23

29

14

110

431
23

14

M10

M9

CN35

2

CN36

2

PWB-I

–

PJ5I-1B(

A-A1

PJ5I-2B(A-A3)

–

PJ5I-3B(

B-B1

PJ5I-4B(B-B3)

–

PJ5I-7A(

A-A1

PJ5I-8A(A-A3)

–

PJ5I-9A(

B-B1

PJ5I-10A(B-B3)

)
)

)
)

PWB-N1

PJ88N1-4(TH1 OUT)

PJ88N1-3(GND)

PJ88N1-2(DC5 V)

PJ88N1-1(UN33 REM)

PWB-N2

PJ89N2-4(TH2OUT)

PJ89N2-3(GND)

PJ89N2-2(DC5 V)

PJ89N2-1(UN34 REM)

PWB-N3

PJ90N3-4(TH3 OUT)

PJ90N3-3(GND)

PJ90N3-2(DC5 V)

PJ90N3-1(UN35 REM)

Imaging Unit

(Bk)

CN50

2

6

10

12111
103

94
875

67
58
439

211
112

PJ7I-1A(TH1 OUT)
PJ7I-2A(GND)
PJ7I-3A(DC5 V)
PJ7I-4A(UN33 REM)
PJ7I-5A(TH2 OUT)
PJ7I-6A(GND)
PJ7I-7A(DC5 V)
PJ7I-8A(UN34 REM)
PJ7I-9A(TH3 OUT)
PJ7I-10A(GND)
PJ7I-11A(DC5 V)
PJ7I-12A(UN35 REM)

PJ13I-4B
PJ13I-3B
PJ13I-5B
PJ13I-6B

4004C25TAC

T-70

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

C0F3A, C0F3B, C0F3C

Step Check Item Result Action

1 ATDC Sensor window is dirty. YES Clean.
2 Imaging Unit window for ATDC Sensor is

dirty.
3 LED retracting lever is locked in position. NO Slide out the Imaging Unit and

4 The problem has been eliminated through

the checks of steps up to 3.
5 The problem is eliminated after the ATDC

Sensor has been replaced.
6 The problem is eliminated after the Imaging

Unit has been replaced.

COF3D

Step Check Item Result Action

1 Malfunction code C0F3D is displayed. YES Change Imaging Unit.
2 The problem is eliminated after the Imaging

Unit has been replaced.

YES Clean.

then reinstall.

NO Check ATDC Sensor connec-

tor. Change ATDC Sensor.

NO Change Imaging Unit.

NO Change Master Board.

NO Check harness . Check con-

nector for connection. Change
Master Board.

(16) C13C8: New Transfer Belt Unit resetting failure

C13CA: New Fusing Unit resetting failure
C13CB: New Fusing Web Unit resetting failure
C13CC: New Oil Coating Unit resetting failure

C13C8, C13CA, C13CB, C13CC

Step Check Item Result Action

1 Each unit is installed properly in the copier

(good contact connection).

YES Change Master Board.

NO Reinstall.

T-71

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(17) C13D1: Cyan IU EEPROM failure

C13D2: Magenta IU EEPROM failure
C13D3: Yellow IU EEPROM failure
C13D4: Black IU EEPROM failure

C13D1, C13D2, C13D3, C13D4

Step Check Item Result Action

1 Imaging Unit is installed properly. NO Reinstall.
2 Connector between the Imaging Unit and

copier is dirty.
3 The problem has been eliminated through

the checks of steps up to 2.
4 The problem is eliminated after the Imaging

Unit has been replaced.

YES Clean.

NO Change Imaging Unit.

NO Change Master Board.

T-72

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(18) C3310: CCD clamp/gain adjustment failure

Relevant Electrical Parts

Exposure Lamp (LA1)
Flat Cable (PWB-Z)

Clamp/Gain Adjustment Values

RO RE GO GE BO BE

Clamp 130 130 130 130 130 130

RO RE GO GE BO BE

Gain 160 160 170 170 160 160

Lamp Adjust-

ment Value

✽

Clamp: Allowable up to ±100 of the above values.

✽

Gain: Allowable up to ±90 of the above values for R and B; allowable up to ±50 of the
above values for G.

✽

Exposure Lamp adjustment value: Allowable in the range between 64 and 192. A differ­ence of up to 30 is allowed between RO and RE, between GO and GE, and between BO
and BE.

CCD Sensor Board (PWB-A)
Image Processing Board (PWB-C)

135

C3310

Step Check Item Result Action

1 Check that each of the values displayed on the screen falls within the above range.
2 There is a wide difference between the

clamp and gain adjustment values, the

value being close to “0” or “255.”

3 Clamp adjustment value exceeds the allow-

able range.

4 The lamp adjustment value or gain value

exceeds the upper limit of the allowable

range, being abnormally great.
5 The lamp adjustment value or gain value

falls short of the lower limit of the allowable

range, being abnormally small.

YES Make positive connection of

the harness connectors
between CCD Sensor Board
and Image Processing Board.

YES Reinstall covers, as extrane-

ous light is the cause of the
problem.

YES Clean lens, mirrors, CCD sur-

face, shading sheet, and
related parts.

YES Reinstall covers, as extrane-

ous light is the cause of the
problem.
Change Scanner, as the
reflectors are deformed.

T-73

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(19) C3700: IR Cooling Fan Motor 1 turning at abnormal timing

C3710: IR Cooling Fan Motor 2 turning at abnormal timing
C3720: Original Glass Cooling Fan Motor turning at abnormal timing

Relevant Electrical Parts

IR Cooling Fan Motor 1 (M3)
IR Cooling Fan Motor 2 (M4)

Image Processing Board (PWB-C)
DC Power Supply 2 (PU2)

Original Glass Cooling Fan Motor (M2)

PWB-C

PJ2C-4B(M2 REM)
PJ2C-5B(GND)
PJ2C-6B(M2 LOCK)

M2

CN3

1
2
3

3
2
1

CN2

M3

1

3

2

2
1

3

PJ6C-4(M3 REM)
PJ6C-5(GND)
PJ6C-6(M3 LOCK)

CN22

M4

1

3

2

2
1

3

PJ6C-7(M4 REM)
PJ6C-8(GND)
PJ6C-9(M4 LOCK)

PJ1C-2
PJ1C-1

PU2

PJ4PU2-1(DC24 V)
PJ4PU2-4(GND)

C3700

Step Check Item Result Action

1 IR Cooling Fan Motor 1 rotation: the voltage

across PJ6C-6 on Image Processing Board

and GND remains DC 0 V while the motor is

turning.

YES Change Image Processing

Board.

NO Change motor.

C3710

Step Check Item Result Action

1 IR Cooling Fan Motor 2 rotation: the voltage

across PJ6C-9 on Image Processing Board

and GND remains DC 0 V while the motor is

turning.

YES Change Image Processing

Board.

NO Change motor.

4004C19TAB

C3720

Step Check Item Result Action

1 Original Glass Cooling Fan Motor rotation:

the voltage across PJ2C-6B on Image Pro-

cessing Board and GND remains DC 0 V

while the motor is turning.

YES Change Image Processing

Board.

NO Change motor.

T-74

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(20) C3A00: PIC communication error

C3A01: PIC Board malfunction
C3FFF: ROM contents fault dete c ted upon start

C3A00

Step Check Item Result Action

1 Harnesses and connectors connecting PIC

Board to Master Board are in good condi-

tion.
2 The problem has been eliminated through

the check of step 1.
3 The problem is eliminated after the PIC

Board has been replaced.

C3A01

Step Check Item Result Action

1 The same malfunction recurs even after the

malfunction has been reset, Power Switch

turned OFF and ON, and the power cord

plugged out and back in.

NO Change harnesses. Recon-

nect connectors.

NO Change PIC Board.

NO Change Master Board.

YES Change PIC Board.

C3FFF

Step Check Item Result Action

1 This malfunction occurs when an attempt is

made to update firmware (rewriting of flash

ROM).
2 The problem has been eliminated through

the check of step 1.

YES Try downloading again.

NO Change Master Board.

T-75

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

3-4. Power Supply-Related Malfunctions

(1) Copier Does not Turned ON.

Relevant Electrical Parts

Power Switch (SW1)
Upper Right Door Switch (SW9)

Master Board (PWB-I)
DC Power Supply 1 (PU1)
DC Power Supply 2 (PU2)

3A
3B

CN1

SW9

1A
2A
2B
1B

GR

Bk

W

Bk

SW1

W

GY

2

GY

1

PJ101

Bk
W
W
Bk

PU1

PJ1PU1-1(L IN)
PJ1PU1-3(N IN)
PJ2PU1-3(N IN)
PJ2PU1-1(L IN)

PU2

PWB-I

PJ4I-1
PJ4I-2

PJ21I-1
PJ21I-3

R
R

CN12CN88

NBk

PG1

L

Step Check Item Result Action

1 Correct wiring is made to the Power Switch

terminal.
2 Correct wiring is made to the Upper Right

Door Switch terminal.
3 Power source voltage is supplied to DC

Power Supply 1.
4 Power source voltage is supplied to the

power outlet.
5 The 5-V line is inadvertently shorted. YES Turn OFF Power Switch, wait

11

W

2

2

PJ3PU1-1
PJ3PU1-2

4004C30TAD

NO Rewire.

NO Rewire.

NO Check wiring.

NO Secure power source voltage.

for a while, and then turn ON
the Power Switch again.

4004C30TAD

T-76

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(2) No Co ntrol Panel Indic a tors Light up.

Relevant Electrical Parts

Control Panel (UN1) IR PRIF Board (PWB-D)

Image Processing Board (PWB-C)

UN1

PJ30UN1-1A(GND)

PJ30UN1-2A(FLM)

PJ30UN1-3A(GND)

PJ30UN1-4A(CL1)

PJ30UN1-5A(GND)

PJ30UN1-6A(CL2)

PJ30UN1-7A(GND)

PJ30UN1-8A(LD0)
PJ30UN1-9A(GND)
PJ30UN1-10A(LD1)

PJ30UN1-11A(GND)

PJ30UN1-12A(LD2)

PJ30UN1-13A(GND)

PJ30UN1-14A(LD3)

PJ30UN1-2B(DC5 V)
PJ30UN1-3B(DC5 V)

PJ30UN1-4B(GND)
PJ30UN1-5B(GND)

PJ30UN1-6B(DC24 V)

PJ30UN1-7B(GND)

PJ30UN1-8B(SLEEP OUT)

PJ30UN1-9B(PRE MOTE)
PJ30UN1-10B(DIS POFF)

PJ30UN1-11B(DC5 V)

PJ30UN1-12B(SD OUT)

PJ30UN1-13B(SD IN)

PJ30UN1-14B(S CLK)

PWB-D

PJ3D-1A
PJ3D-2A
PJ3D-3A
PJ3D-4A
PJ3D-5A
PJ3D-6A
PJ3D-7A
PJ3D-8A
PJ3D-9A
PJ3D-10A
PJ3D-11A
PJ3D-12A
PJ3D-13A
PJ3D-14A
PJ3D-13B
PJ3D-12B
PJ3D-11B
PJ3D-10B
PJ3D-9B
PJ3D-8B
PJ3D-7B
PJ3D-6B
PJ3D-5B
PJ3D-4B
PJ3D-3B
PJ3D-2B
PJ3D-1B

PJ6D

CN2

PWB-C

4004C29TAA

Step Check Item Result Action

1 DC 24 V is output from PJ3D-9B on IR

PRIF Board.

2 DC 24 V is input to PJ30UN1-6B on Control

Panel.

3 Control Panel screen is displayed with 24 V

being input.

NO Change IR PRIF Board.

NO Check or change harness.

NO Change Image Processing

Board. Change IR PRIF
Board.

4004C29TAA

T-77

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(3) No Power is Supplied to Options.

Relevant Electrical Parts

DC Power Supply 1 (PU1) DC Power Supply 2 (PU2)

PU1

PJ5PU1-2(DC24 V) CN60-11

PJ5PU1-3(GND)

Sorter

CN60-5

L

N

PJ5PU1-4(GND)

PJ5PU1-5(DC24 V)

Duplex

CN62-2
CN62-1

Tray

PJ5PU1-6(DC24 V)

PJ7PU1-5(GND)

PJ5PU2-1(DC24 V)

PJ5PU2-2(GND)

Step Check Item Result Action

1 Power source voltage is applied to DC

Power Supply 1.

2 DC 24 V is output from DC Power Supply 1

and DC Power Supply 2.

3 There is an open-circuit in the harness from

DC Power Supply 1 and DC Power Supply
2 to option connector.

CN82-1
CN83-1
CN82-2
CN83-2

ADFPU2

CN5-11
CN5-5

NO Check wiring.

NO Change DC Power Supply 1.

Change DC Power Supply 2.

YES Change harness.

4004C28TAA

T-78

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

4. IMAGE QUALITY PROBLEMS

4-1. Troubleshooting Image Quality Problems

• This chapter is divided into two parts: “Initial Check Items” and “Troubleshooting Proce­dure by a Particular Image Quality Problem.”

• When an image quality problem occurs, first go through the “Initial Check Items” and, if
the cause is yet to be identified, go to “Troubleshooting Procedure by a Particular Image
Quality Problem.”

4-2. Initial Check Items

1. First determine which of the following three is responsible for the image quality prob-

lem: the input system (IR), interface system, or the output system (printer).
When an image quality problem occurs, possible causes that are likely to be responsi­ble for it may be broadly grouped into the following three: those relating to the Scanner
of the IR unit, the interface between the IR unit and printer, and the printer.
As a procedure to isolate basic causes, you first let the printer produce test prints. If the
image quality problem of the same sort is evident on the test patterns, then the printer is
very likely to be responsible for it. If not, the cause is attributable to the Scanner of the
IR unit or the interface.
The next step to take to identify whether the problem is attributable to the IR Scanner or
the interface is to produce IR test prints. If the problem of the same sort is evident on
the test patterns, then the interface is probably responsible for it.
If the same symptom does not occur on the test prints, then the IR Scanner is responsi­ble for the problem.

IR Area

I/F Area

Printer Area

CCD Sensor

Image Processing Boad

I/F Cable

PIC Board

LED Drive

T-79

IR Test print

Printer Test print

4004T006CA

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

Step Symptom Check Result Cause

Gradation fail­ure, density
failure

Uneven den­sity, pitch
noise, or image
noise (lines,
bands, spots,
etc.)

1

Foggy back­ground

Color reproduc­tion failure

Abnormal

2

image

The faulty symptom occurs when
a test print is produced with the
following settings made: “Test
Print” → “Gradation Pattern” → “4
Color.”

The faulty symptom occurs when
a test print is produced with the
following settings made: “Test
Print” → “Halftone Pattern” → “C →
M → Y → Bk” → Enter “64” in
“Density.” → Select “Hyper.”

The faulty symptom occurs when
a test print is produced with the
following settings made: “Test
Print” → “Halftone Pattern” → “C →
M → Y → Bk” → Enter “0” in “Den­sity.”

The faulty symptom occurs when
a test print is produced with the
following settings made: “Test
Print” → “Color Sample” → Enter
“255” in “Density.”

The faulty symptom occurs when
a test print is produced with the
following settings made: “Test
Print” → “IR Test Pattern.”

YES Printer

NO To step 2

YES Printer

NO To step 2

YES Printer

NO To step 2

YES Printer

NO To step 2

YES Interface☞ T-93

NO IR

Ref.

Page

☞

☞

☞

☞

☞

T-96

–

T-96

–

T-96

–

T-96

–

T-82

T-80

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

2. If the output system (printer) is responsible for the image quality problem, determine if it

occurs with a single color of Y, M, C, or Bk, or four colors.
By rule of thumb, if the problem occurs with a single color, the corresponding Imaging
Unit is very likely to be faulty. If the problem occurs with four colors, the Transfer Belt
and/or Fusing Unit are probably defective.
The same problematic symptom occurs with each of the four colors, then the Transfer
Belt, Image Transfer Rollers, and/or the Fusing Unit are responsible for it.
If the symptom occurs with a single color, each Imaging Unit is responsible for it.

4 colors

Mono color

Step Symptom Check Result Cause

Printer
4 color

Printer

mono-

color

Printer
4 color

Printer

mono-

color

Printer
4 color

Printer

mono-

color

Gradation fail­ure, density
failure

Uneven den­sity, pitch
noise, or image

1

noise (lines,
bands, spots,
etc.)

Foggy back­ground

The faulty symptom occurs with
each of the four colors when a test
print is produced with the follow­ing settings made: “Test Print” →
“Gradation Pattern” → “4 Color.”

The faulty symptom occurs with
each of the four colors when a test
print is produced with the follow­ing settings made: “Test Print” →
“Halftone Pattern” → “C → M → Y

→

Bk” → Enter “64” in “Density.” →

Select “Hyper.”
he faulty symptom occurs with

each of the four colors when a test
print is produced with the follow­ing settings made: “Test Print” →
“Halftone Pattern” → “C → M → Y

→

Bk” → Enter “0” in “Density.”

YES

NO

YES

NO

YES

NO

4004T008CA

Ref.

Page

☞

T-114

☞

T-96

☞

T-114

☞

T-96

☞

T-114

☞

T-96

T-81

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

4-3. Troubleshooting Procedure by a Particular Image Quality

Problem

(1) IR Scanner System: white lines in FD, white bands in FD, colored lines in FD,

and colored bands in FD

<Typical Faulty Images>

White lines in FD Colored lines in FDWhite bands in FD Colored bands in FD

4011T015AA 4011T020AA 4011T017AA 4011T023AA

<Troubleshooting Procedure>

Section S tep Check Item Result Action
Original 1 Original is damaged or dirty. YES Change original.
Original

Cover
Original

Glass
Shading

sheet
Mirror, lens,

Exposure
Lamp, and
reflectors

Left Image
(Tech. Rep.
function)

IR 7 The white lines/bands or col-

2 Original Pad is dirty. YES Clean.

3 Original Glass is dirty. YES Wipe the surface clean with a

4 Shading sheet is dirty. YES Wipe the surface clean with a

5 Mirror is dirty. YES Clean.

Lens is dirty. YES Clean.
Exposure Lamp is dirty. YES Clean.
Reflectors are dirty. YES Clean.

6 The Scanner starts reading the

image at the position of 0 mm
from the scale.

ored lines/bands are blurry.

8 The white lines/bands or col-

ored lines/bands are clear and
distinct.

soft cloth.

soft cloth.

NO Adjust the image reading

position in the range of ±10
mm.

YES Change Scanner Assy.

YES Change CCD Unit.

T-82

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(2) IR Scanner System: white lines in CD, white bands in CD, colored lines in CD,

and colored bands in CD

<Typical Faulty Images>

White lines in CD White bands in CD Colored lines in CD Colored bands in CD

4011T016AA 4011T021AA 4011T018AA 4011T022AA

<Troubleshooting Procedure>

Section S tep Check Item Result Action
Original 1 Original is damaged or dirty. YES Change original.
Original

Cover
Original

Glass
Flat cable 4 Flat cable terminal is con-

Top Image
(Tech. Rep.
function)

IR 6 The problem has been elimi-

2 Original Pad is dirty. YES Clean.

3 Original Glass is dirty. YES Wipe the surface clean with a

soft cloth.

nected properly.

5 The Scanner starts reading the

image at the position of 0 mm
from the scale.

nated through the checks of
steps up to 5.

7 The problem is eliminated after

the Scanner Assy has been
replaced.

NO Clean terminal. Reconnect.

Change flat cable.

NO Adjust the image reading

position in the range of ±10
mm.

NO Change Scanner Assy.

NO Change CCD Unit.

T-83

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(3) IR Scanner System: color spots

<Typical Faulty Image>

Color spots

C F

4011T027AA

<Troubleshooting Procedure>

Section S tep Check Item Result Action
Original 1 Original is damaged or dirty. YES Change original.
Original

Cover
Original

Glass
IR 4 The problem has been elimi-

2 Original Pad is dirty. YES Clean.

3 Original Glass is dirty. YES Wipe the surface clean with a

nated through the checks of
steps up to 3.

5 The problem is eliminated after

the Scanner Assy has been
replaced.

soft cloth.

NO Change Scanner Assy.

NO Change CCD Unit.

T-84

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(4) IR Scanner System: fog

<Typical Faulty Image>

Fog

4011T004AA

<Troubleshooting Procedure>

Section S tep Check Item Result Action
Warning

display

Original 3 Original is damaged or dirty. YES Change original.
Original

Cover

Original
Glass

Shading
sheet

Mirror, lens,
Exposure
Lamp, and
reflectors

Exposure
setting
(panel set­ting)

1 Maintenance call mark S-2

(intensity adjustment failure) is
displayed.

2 Maintenance call mark S-1

(gain adjustment failure) is dis­played.

4 Original Pad is dirty. YES Clean.
5 Original Cover does not lie flat. YES Change Original Cover if it is

6 Original Glass is dirty. YES Wipe the surface clean with a

7 Shading sheet is dirty. YES Wipe the surface clean with a

8 Mirror is dirty. YE S Clean.

Lens is dirty. YES Clean.
Exposure Lamp is dirty. YES Clean.
Reflectors are dirty. YES Clean.

9 The problem is eliminated after

the exposure mode has been
changed to Auto.

YES Carry out remedial action pro-

cedures for S-2 as part of
image stabilizer malfunction
troubleshooting procedures.

YES Carry out remedial action pro-

cedures for S-1 as part of
image stabilizer malfunction
troubleshooting procedures.

deformed or hinges are bro­ken.

soft cloth.

soft cloth.

NO Change the exposure mode

to Manual.

T-85

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

Section S tep Check Item Result Action
IR 10 T he problem has been elimi-

nated through the checks of
steps up to 9.

11 The problem is eliminated after

the Scanner Assy has been
replaced.

NO Change Scanner Assy.

NO Change CCD Unit.

T-86

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(5) IR Scanner System: blurred image, blotchy image

<Typical Faulty Image>

Blurred image, blotchy image

4011T046AA

<Troubleshooting Procedure>

Section S tep Check Item Result Action
Original

Cover

Original
Glass

IR 3 Scanner is not aligned with the

1 Original Cover does not lie flat. YES Change Original Cover if it is

2 O riginal Glass tilts. YES Position Original Glass cor-

2nd/3rd Mirrors Carriage.

4 T he problem has been elimi-

nated through the checks of
steps up to 3.

5 The problem is eliminated after

the Scanner Assy has been
replaced.

deformed or hinges are bro­ken.

rectly. Check original loading
position.

YES Readjust with the Scanner/

Mirrors Carriage Positioning
Jigs.

NO Change Scanner Assy.

NO Change CCD Unit.

T-87

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(6) IR Scanner System: incorrect color image registration

<Typical Faulty Image>

Incorrect color image registration

C F

C F

4011T039AA

<Troubleshooting Procedure>

Section S tep Check Item Result Action
Original

Cover

Slide rails 2 Foreign matter on rails. YES Clean.
Drive

Cables
Scanner

Motor
IR 5 The problem has been elimi-

1 Original Cover does not lie flat. YES Change Original Cover if it is

deformed or hinges are bro­ken.

3 C able kinks or is damaged. YES Correct or change.

4 S canner Mot or turns smoothly. NO Chang e belt. Change Scan-

ner Motor.

NO Change CCD Unit.
nated through the checks of
steps up to 4.

T-88

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(7) IR Scanner System: moire

<Typical Faulty Image>

Moire

4011T040AA

<Troubleshooting Procedure>

Section S tep Check Item Result Action

Original 1 Moire distortions occur. YES Change original loading direc-

Original 2 Moire distortions recur even

after the orientation of original
has been changed.

Mode
change

3 Moire distortions recur even

after the original mode has
been changed.

4 T he problem has been elimi-

nated through the checks of
steps up to 3.

tion.

YES Change the original mode

(select one other than that
resulted in moire).

YES Select “Gradation” (mode

optimized for gradation) or
“Resolution” (that optimized
for resolution).

NO Change the zoom ratio.

T-89

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(8) IR Scanner System: skewed image

<Typical Faulty Image>

Skewed image

C F

4011T048AA

<Troubleshooting Procedure>

Section S tep Check Item Result Action
Original 1 Original is skew. YES Reposition original.
Original

Glass

2nd/3rd
Mirrors Car­riage

IR 4 The problem has been elimi-

2 O riginal Glass is in positive

contact with the flat spring
without being tilt.

3 Scanner Assy is not properly

aligned with 2nd/3rd Mirrors
Carriage.

nated through the checks of
steps up to 3.

5 The problem is eliminated after

the Scanner Assy has been
replaced.

NO Reinstall the glass. Check the

original loading position.

YES Readjust with the Scanner/

Mirrors Carriage Positioning
Jigs.

NO Change Scanner Assy.

NO Change CCD Unit.

T-90

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(9) IR Scanner System: distorted image

<Typical Faulty Image>

Distorted image

ABCDE
ABCDE
ABCDE
ABCDE
ABCDE

4011T045AA

<Troubleshooting Procedure>

Section S tep Check Item Result Action
Installation 1 IR is installed on a level sur-

2nd/3rd
Mirrors Car­riage

Scanner
Motor

IR 4 The problem has been elimi-

face if mounted without any
rack.

Rack is installed on a level sur­face.

Rack is tilt with a lot of play. YES Adjust rack legs.

2 Scanner Assy is not properly

aligned with 2nd/3rd Mirrors
Carriage.

3 S canner Mot or turns smoothly. NO Chang e belt. Change Scan-

nated through the checks of
steps up to 3.

5 The problem is eliminated after

the Scanner Assy has been
replaced.

NO Reinstall.

NO Reinstall.

YES Readjust with the Scanner/

Mirrors Carriage Positioning
Jigs.

ner Motor.

NO Change Scanner Assy.

NO Change CCD Unit.

T-91

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(10) IR Scanner System: low image density, rough image

<Typical Faulty Image>

Low image density

4011T003AA

<Troubleshooting Procedure>

Section S tep Check Item Result Action
Warning

display

Original 3 Original sticks to Original

Original
Glass

Shading
sheet

Mirror, lens,
Exposure
Lamp, and
reflectors

Exposure
Lamp

IR 8 The problem is eliminated after

1 Maintenance call mark S-2

(intensity adjustment failure) is
displayed.

2 Maintenance call mark S-1

(gain adjustment failure) is dis­played.

Glass.

4 Original Glass is dirty. YES Wipe the surface clean with a

5 Shading sheet is dirty. YES Wipe the surface clean with a

6 Mirror is dirty. YES Clean.

Lens is dirty. YES Clean.
Exposure Lamp is dirty. YES Clean.
Reflectors are dirty. YES Clean.

7 T he problem has been elimi-

nated through the check of
step 6.

the Exposure Lamp has been
changed.

9 The problem is eliminated after

the Scanner Assy has been
changed.

YES Carry out remedial action pro-

cedures for S-2 as part of
image stabilizer malfunction
troubleshooting procedures.

YES Carry out remedial action pro-

cedures for S-1 as part of
image stabilizer malfunction
troubleshooting procedures.

YES Reposition original.

soft cloth.

soft cloth.

NO Clean or change Exposure

Lamp.

NO Change Scanner Assy.

NO Change CCD Unit.

T-92

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(11) IR Scanner System: defective ACS

<Typical Faulty Image>

Defective ACS

Colored Area of Original

CF

ABCDE
ABCDE
ABCDE
ABCDE

Black-and-White Area of
Original

ABCDE

4011T052AA

<Troubleshooting Procedure>

Section S tep Check Item Result Action
ACS Deter-

mination
Level
Adjust
(User’s
Choice
function)

1 A CS failure occurs . YE S Change ACS Determination

The problem persists even
after the ACS Determination
Level Adjust function has been
changed.

Level Adjust function.

YES Change the original loading

direction. Make manual set­tings according to the type of
original. (If the original con­tains a colored area in one of
its corners, the copier may fail
to properly detect the colored
area.)

T-93

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

01.02.09

(12) IR Control System: blank copy, black copy

<Typical Faulty Images>

Blank copy Black copy

4011T036AA

4011T035AA

<Troubleshooting Procedure>

Section S tep Check Item Result Action
Cable con-

necting IR

1 Connector is connected prop-

erly with no pins bent.

NO Reconnect.

and printer
Image Pro-

cessing
Board

Connection
between IR
and printer

Image Pro­cessing
Board

PIC Board 5 The problem has been elimi-

2 Connectors on the Image Pro-

cessing Board are connected
properly.

3 T he problem has been elimi-

nated through the check using
IR test pattern.

4 The problem is eliminated after

the I/F connection cable has
been changed.

NO Reconnect.

NO Change I/F connection cable.

NO Change Image Processing

Board.

NO Change PIC Board.
nated through the checks of
steps up to 4.

T-94

FrameMaker Ver.5.5E(PC) 7915/7920 TROUBLESHOOT ING

CF

ABCDE
ABCDE
ABCDE

01.02.09

(13) IR Control System: abnormal image

<Typical Faulty Images>

Abnormal image

ABCDE

Abnormal image

Data on previous page

ABCDE
ABCDE
ABCDE

Data on current page

ABCDE

4011T053AA

<Troubleshooting Procedure>

Section S tep Check Item Result Action

Cable con­necting IR
and printer

Image Pro­cessing
Board

PIC Board 3 If the copy contains part of

Connection
between IR
and printer

Image Pro­cessing
Board

PIC Board 6 The problem is eliminated

1 Connector is connected prop-

erly with no pins bent.

2 Connectors on the Image Pro-

cessing Board are connected
properly.

data on the previous page
together with that on the cur­rent page, the expanded mem­ory (rim) is properly mounted
to the PIC Board.

4 T he problem has been elimi-

nated as checked on IR test
prints produced.

5 The problem is eliminated after

the interface connection cable
has been changed.

through the checks of steps up
to 5.

4011T063AA

NO Reconnect.

NO Reconnect.

NO Reinstall expanded memory.

NO Change interface connection

cable.

NO Change Image Processing

Board.

NO Change PIC Board.

T-95