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
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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
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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
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