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All in One Printer
C821
Oki C821 Maintenance Manual
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44015503TH Re
v
.
1
210 /
Oki Data CONFIDENTIAL
7.
TR
O
UB
L
E
SH
O
O
TIN
G
P
R
OCE
D
U
RE
H
VO
L
T
Duple
x unit
Cable43
SNS
03
SNS
12
SNS
4
CL1
CL2
MO
T
O
R
MAI
N1
F
AN
DUP
LE
X
F
AN
SNS
03
SNS1
2
PSZ
CL1
CL2
MO
T
OR
MAI
N1
M
AI
N2
B
o
a
r
d
-
V
7
Y
-1
1
2
n
d
(
3
r
d
)
T
r
a
y
B
o
a
r
d
-
V
7
Y
-4
Shutter solenoid
Hopping
motor
Relay
Relay
Environment sensor
OPTION
PSIZE
PO
WF
AN
POW
ER
PU
bo
ar
d
HOPIDU
P
F
ANSOL
Boa
rd-
PRG
-2
SSNS
operat
ional
panel
CUI
F
PUI
F
PC
I
/F
K-
HE
AD
Y
-HEA
D
M-
HE
AD
C-
HE
AD
FUS
ER
IN
RF
I
D
R
/
W
Boa
rd
-R
FI
D
REA
D/
WRI
TE
S
YS
TE
M
SSN
S
OPE
OPE
CN3
Paper-end sensor
WR sensor
IN1
sensor
IN2
sensor
Boa
rd-
RSF
Hopping
solenoid
DUPLEX
unit
Paper siz
e
SW
Low-voltage
F
AN
2nd
T
ra
y
HSOL
FSN
S
PE
Low-v
oltage po
wer supply
A
C
CN2
CU
boa
rd
TB2
PO
WE
R
T
oner-Low
sensor
T
oner-Low
sensor
T
oner-Low
sensor
T
oner-Low
sensor
Boa
rd-
PRZ
Fuser
motor
(DC)
Belt
motor
ID
up motor
ID
motor
(DC)
RELA
Y
PU
bo
ar
d
DCID
BEL
T
DCHEA
T
RFID
HVOL
T
PUI
F
FUS
ER
EXI
T
DEN
S
LCR
RCR
FU
S
ER
U
NI
T
B
o
a
r
d
-
P
6
Y
Color registration
sensor
Board-PRC
T
emperature
sensor
EXIT
sensor
RFID Antenna
Board-POL
Cover open
switch
Internal temperature
thermistor
Fuser
F
AN1
High-voltage po
wer supply
ID UP/DOWN
sensor
IN
sensor
Cover open
sensor
Front
sensor
Rear
sensor
Bottom
sensor
DUPLEX clutch
Separator
solenoid
DUPLEX
motor
3rd TRA
Y
Paper end
sensor
Hopping
sensor
IN
sensor
Paper siz
e
switch
Feed clutch
Pri
nt
er
ma
in
u
ni
t
Pri
nt
er
ma
in
u
ni
t
Hopping clutch
Feed
transport
motor
K2
Y2
M2
C2
RFI
D
Fuser right-end F
AN
Fuser entrance
sensor
Fuser
release
sensor
7.5.2.(19)
Wiring diagram
210
212
Table of Contents
Table of Contents
5
Default Chapter
5
Description of Operation
5
1 Configuration
8
System Configuration
9
Printer Configuration
10
Composition of Optional Items
11
Specifications
12
Interface Specifications
15
USB Interface Connectors and Cables
15
USB Interface Overview
15
USB Interface Signals
15
USB Interface Specifications
15
Connector and Cable of Network Interface
16
Network Interface Overview
16
Network Interface Signals
16
Network Interface Specifications
16
Connector and Cable of Parallel Interface
17
Parallel Interface Levels
17
Parallel Interface Overview
17
Parallel Interface Specifications
17
2 Description of Operation
18
Electrophotographic Process Mechanism
19
Printing Process
22
Installation
32
Cautions, and Do's and Don'ts
33
Unpacking Procedure
34
Printer Installation Instructions
35
List of Components and Accessories
36
Assembly Procedure
37
Assembly of the Printer Main Unit
37
Loading Paper in the Paper Cassette
40
Connection of the Power Cable
42
Turning off the Power
43
Installation and Recognition Confirmation of Options
44
Printing of the Configuration Report
58
Connection Methods
59
Usb Connection
59
Ethernet Cable Connection
60
Parallel Connection
60
Checking of Paper Used by the User
61
4 Replacement of Parts
62
Notes on Replacement of Parts
63
Part Replacement Procedure
65
Belt Unit
65
Fuser Unit
66
Left Side Cover
67
Right Side Cover
68
Rear Cover Assy
69
LED Assy
70
Main Controller PCB, Image Drum Motor, Image Drum Lift-Up Motor and Feed Motor
71
Print Engine Controller PCB
74
Top Cover Assy
76
Top Cover
78
Operator Panel Assy
79
Board PRP
80
Shaft-Ejection Assy. (FU) and Shaft-Ejection Assy. (FD)
81
Guide-Ejection Assy.-Lower, Color-Registration Assy. and Relay Board (P6Y)
82
Fan (Fuser), High-Voltage Power Supply Board, Contact Assy., Fuser Sensor Assy
86
MPT Assy., MPT Hopping Roller, Separator and Pick-Up Roller
88
Registration Roller Assy
89
Gear Box, Registration/Hopping Roller Assy. and Solenoid
90
Holder-Switch Assy., Low-Voltage Power Supply Fan and Low-Voltage Power Supply
93
Belt Motor Assy. and Fuser Motor Assy
95
Side-R Assy. and Side-L Assy
97
Paper Feed Roller (Tray 1)
99
Paper Feed Rollers (Tray 2/3 (Option))
101
Paper Feed Roller (Multi-Purpose Tray)
103
Portions Lubricated
104
Maintenance Menus
120
System Maintenance Menu (for Maintenance Personnel)
121
Maintenance Utility
123
User Maintenance Menu Functions
125
Maintenance Menu (for End-Users)
125
Self-Diagnostic Mode
128
Operator Panel
128
Normal Self-Diagnostic Mode (Level 1)
130
Switch Scan Test
131
Motor and Clutch Test
133
Test Printing
135
Color Registration Adjustment Test
139
Density Adjustment Test
140
Consumable Counter Display
142
Factory-Shipping Mode Switching
143
Print Counter Display
143
Self-Diagnostic Function Setting
144
LED Head Serial Number Display
145
Nvram Parameter Setting
145
Printing on Stand-Alone Basis
145
Functions of Buttons after Power-On
146
Setup after Part Replacement
147
Notes on Engine Control Board Replacement
147
EEPROM Setup after CU Board Replacement
148
Manual Density Adjustment Setting
149
Boot Menu List
150
6 Cleaning
152
Cleaning
153
LED Lens Array Cleaning
154
Pick-Up Roller Cleaning
156
Troubleshooting Procedure
157
Before Starting the Repair Work
158
Confirmation Items before Taking Corrective Action against Abnormalities
158
Precautions When Taking Corrective Action against Abnormality
158
Preparation for Troubleshooting
158
Troubleshooting Method
159
LCD Message List
159
7.5.2 Preparation for Troubleshooting
180
Preparation for Troubleshooting
180
1) LCD Display Error
181
LCD Display Error
181
LCD Does Not Display Anything
181
Please Wait
182
Error Messages Related to Operator Panel Are Displayed
182
Displaying as "RAM Check" or "Initializing
182
2) Abnormal Operations of Printer after the Power Is Turned on
183
Abnormal Operations of Printer after the Power Is Turned on
183
Any Operation Does Not Start at All
183
Abnormal Sound Is Heard
183
Bad Odors Are Generated
184
Rise-Up Time Is Slow
184
3) Paper Feed Jam (Error Code 391: 1St Tray)
192
Paper Feed Jam (Error Code 391: 1St Tray)
192
Jam Occurs Immediately after the Power Is Turned On. (1St Tray)
192
Jam Occurs Immediately after the Paper Feed Is Started. (1St Tray)
192
4) Feed Jam (Error Code 380)
194
Feed Jam (Error Code 380)
194
Jam Occurs Immediately after the Power Is Turned on
194
Jam Occurs Immediately after the Paper Feed Is Started
194
5) Paper Feed Jam (Error Code 390: Multipurpose Tray)
195
Paper Feed Jam (Error Code 390: Multipurpose Tray)
195
Jam Occurs Immediately after the Power Is Turned on
195
(Multipurpose Tray)
195
Jam Occurs Immediately after Paper Feed Is Started
196
(Multipurpose Tray)
196
6) Paper Running Jam (Error Code 381)
197
Paper Running Jam (Error Code 381:)
197
Jam Occurs Immediately after the Power Is Turned on
197
Jam Occurs Immediately after a Paper Is Taken into Printer
197
Jam Occurs in the Middle of Paper Running Path
198
7) Paper Unloading Jam (Error Code 382)
199
Paper Unloading Jam (Error Code 382)
199
Jam Occurs Immediately after Paper Has Reached the Fuser
199
Paper Unloading Jam Occurs Immediately after the Power Is Turned on
199
Paper Unloading Jam Occurs after a Paper Is Taken into Printer
200
Paper Unloading Jam Occurs in the Middle of Paper Running Path
200
8) Two-Sided Printing Jam (Error Code: 370, 371, 372, 373, 383)
201
Two-Sided Printing Jam (Error Code: 370, 371, 372, 373, 383)
201
Two-Sided Printing Jam Occurs Immediately after the Power Is Turned on
201
Two-Sided Printing Jam Occurs During Taking in the Paper into Duplex Unit
201
Two-Sided Printing Jam Occurs in the Process of Reversing Paper
202
Two-Sided Printing Jam Occurs During Transporting Paper Inside the Duplex Unit
202
Paper Is Not Supplied from the Duplex Unit to the Regist Roller
202
9) Paper Size Error (Error Code 400 and 401)
203
ID Unit Up/Down Error (Service Call 140 to 143)
203
Jam Occurs When Paper End Is Located Near the IN1 Sensor
203
Error Occurs During the up Movement of the ID Unit
203
11) Fuser Unit Error (Error 170 to 177)
204
Paper Size Error (Error Code 400 and 401)
203
10) ID Unit Up/Down Error (Service Call 140 to 143)
203
Fuser Unit Error (Error 170 to 177)
204
Error Occurs During the down Movement of the ID Unit
204
Error Occurs Immediately after the Power Is Turned on
204
Error Occurs Approx. 1 Minute after the Power Is Turned on
204
12) Motor Fan Error (Error Code 122, 127, 128, 918, 051)
205
Motor Fan Error (Error Code 122, 127, 128, 918, 051)
205
The Low Voltage Power Supply Fan Does Not Rotate Immediately after the Power Is Turned on
205
Duplex Fan Does Not Rotate During the Duplex Printing
205
13) Print Speed Is Slow. (Performance Is Low.)
206
Option Unit Cannot be Recognized
206
All Fans of the Printer Do Not Rotate
206
Print Speed Decreases
206
Duplex Unit Cannot be Recognized
206
Option Try Unit Cannot be Recognized
206
(Error Code 131, 132, 133, 134)
207
15) LED Head Cannot be Recognized
207
Print Speed Is Slow. (Performance Is Low.)
206
14) Option Unit Cannot be Recognized
206
LED Head Cannot be Recognized. (Error Code 131, 132, 133, 134)
207
Service Call 131 to 134 (LED HEAD Missing)
207
(Error Code 540, 541, 542, 543)
208
16) Toner Cartridge Cannot be Recognized
208
Toner Cartridge Cannot be Recognized. (Error Code 540, 541, 542, 543)
208
Error Caused by the Consumable Items
208
Error Caused by the Toner Sensor
208
17) Fuse Cut Error (Error Codes 150 to 155)
209
Fuse Cut Error (Error Codes 150 to 155)
209
Error Caused by the Defective Mechanism
209
Fuse Cut Error
209
18) Humidity Sensor Error (Error Code 123)
210
Humidity Sensor Error (Error Code 123)
210
Humidity Sensor Error
210
19) Wiring Diagram
211
Wiring Diagram
211
7.5.3 Troubleshooting the Abnormal Images
212
Troubleshooting the Abnormal Images
212
1) Color Has Faded-Out and Blurred Entirely
213
(Refer to Figure 7-2 A.)
213
Color Has Faded-Out and Blurred Entirely. (Refer to Figure 7-2 A.)
213
Color Are Faded-Out and Blurred
213
2) Stain on White Print (Refer to Figure 7-2 B.)
214
Stain on White Print (Overall Stain)
214
Stain on White Print (Partial Stain)
214
Stain on White Print (Refer to Figure 7-2 B.)
214
3) White Print (Refer to Figure 7-2 C.)
215
White Print (Refer to Figure 7-2 C.)
215
White Print over Entire Page
215
4) Black Banding/Black Streaking in Vertical Direction
216
5) Cyclic Abnormality (Refer to Figure 7-2 E.)
216
Black Banding/Black Streaking in Vertical Direction
216
Cyclic Abnormality (Refer to Figure 7-2 E.)
216
Thin Vertical Line (with Color) (Refer to Figure 7-2 D.)
216
Thin Vertical Line (Without Color) (Refer to Figure 7-2 F.)
216
Cyclic Abnormality Occurs in Vertical Direction
216
6) Heavy Color Registration Error
217
Entirely Black Print
217
Display of the Message "Color Adjustment Is in Progress" Appears Only Short Time
217
Though REG ADJUST TEST of Engine Maintenance Function Is Ok, Color Blur Occurs
217
All Black Print over Entire Page
217
8) for the Entire Monochrome Print, It Does Not Being Printed
218
Heavy Color Registration Error
217
7) Entirely Black Print
217
For the Entire Monochrome Print, It Does Not Being Printed
218
Setting by Mistake of the Specific Color Print Menu
218
Network Troubleshooting
219
Connection Error Occurs with the Web Browser
219
Print Operation Is Not Possible
225
Cannot Create Certificate
226
Installation of Certificate Is Not Possible
226
Other Questionnaires
228
Restrictions When Using Internet Explore 7
230
Fuse Check
231
Paper Cassette Switches Versus Paper Size Correspondence Table
232
Data Protection Kit-A3
233
Data Protection Kit-A3 (DPK-A3) Overview
233
8 Connection Diagrams
237
Resistance Value Check
238
Parts Location
242
F/W Version Number
252
ROM Control Number
252
ROM Version Check and Display
252
PCB Maintenance Indication Stamp
253
Other manuals for Oki C821
User Guide
104 pages
Security Guide
23 pages
4
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Oki C821 Specifications
General
Brand
Oki
Model
C821
Category
All in One Printer
Language
English
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