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Kyocera FS-1128MFP Service Manual - Page 135

Electric problems, Problem, Causes, Check procedures/corrective measures

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2JN 1-4-4 Electric problems Problem Causes Check procedures/corrective measures (1)The machine does not operate when the main power switch is turned on. No electricity at the power outlet. The power cord is not plugged in properly. Measure the input voltage. Check the contact between the power plug and the outlet. The top cover is not closed Check the top cover. completely. Broken power cord. Check for continuity. If none, replace the cord. Defective main power switch. Check for continuity across the contacts. If none, replace the power source PWB (See page 1-5-42). Blown fuse in the power source PWB. Check for continuity. If none, remove the cause of blowing and replace the power source PWB (See page 1-5-42). Defective interlock switch. Check for continuity across the contacts of interlock switch. If none, replace the power source PWB (See page 1-5-42). Defective power source PWB. Replace the power source PWB (See page 1-5-42). Defective control PWB. Replace the control PWB (See page 1-5-39). (2)Right cooling fan motor does not operate. Broken right cooling fan motor coil. Defective harness between right cooling fan motor and control PWB (YC27), or improper connector insertion. Check for continuity across the coil. If none, replace the right cooling fan motor. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness. Defective control PWB. Replace the control PWB (See page 1-5-39). (3)Left cooling fan motor does not operate. Broken left cooling fan motor coil. Defective harness between left cooling fan motor and control PWB (YC104), or improper connector insertion. Check for continuity across the coil. If none, replace the left cooling fan motor. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness. Defective control PWB. Replace the control PWB (See page 1-5-39). (4)Power source fan motor does not operate. Broken power source fan motor coil. Defective harness between power source fan motor and control PWB (YC107), or improper connector insertion. Check for continuity across the coil. If none, replace the power source fan motor. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness. Defective control PWB. Replace the control PWB (See page 1-5-39). (5)Registration clutch Broken registration clutch does not operate. coil. Check for continuity across the coil. If none, replace the registration clutch. Defective harness between registration clutch and control PWB (YC20), or improper connector insertion. Reinsert the connector. Also check for continuity within the connector harness. If none, remedy or replace the harness. Defective control PWB. Replace the control PWB (See page 1-5-39). 1-4-17

Section	Page
Cover	1
Revision history	3
Safety precautions	5
CONTENTS	11
Specifications	15
1-1-1 Specifications	15
1-1-2 Parts names	18
(1) Overall	18
(2) Operation panel	19
1-1-3 Machine cross section	20
Installation	23
1-2-1 Installation environment	23
1-2-2 Unpacking	24
(1) Unpacking	24
(2) Removing the tapes	25
1-2-3 Installing the expansion memory (option)	28
Maintenance Mode	29
1-3-1 Maintenance mode	29
(1) Executing a maintenance item	29
(2) Maintenance modes item list	30
(3) Contents of the maintenance mode items	34
1-3-2 Management mode	103
(1) Using the management mode	103
(2) Common Settings	104
(3) Copy Settings	108
(4) Sending Settings	108
(5) Document Box Settings	108
(6) Printer Settings	109
(7) Printing Reports/Sending Notice	109
(8) Adjustment/Maintenance	110
(9) Date/Timer	110
(10) Editing Destination (Address Book/Adding One- Touch Keys)	111
(11) Restarting the System	112
(12) Network Setup	112
(13) User Login Administration	114
(14) Job accounting	114
(15) FAX Settings	116
Troubleshooting	119
1-4-1 Paper misfeed detection	119
(1) Paper misfeed indication	119
(2) Paper misfeed detection condition	120
1-4-2 Self-diagnostic function	121
(1) Self-diagnostic function	121
(2) Self diagnostic codes	122
1-4-3 Image formation problems	130
(1) Completely blank printout.	131
(2) All-black printout.	131
(3) Dropouts.	132
(4) Black dots.	132
(5) Black horizontal streaks.	132
(6) Black vertical streaks.	133
(7) Unsharpness.	133
(8) Gray background.	133
(9) Dirt on the top edge or back of the paper.	134
(10) Undulated printing at the right edge (scanning start position).	134
1-4-4 Electric problems	135
1-4-5 Mechanical problems	138
1-4-6 Error codes	139
(1) Error code	139
(2) Table of general classification	140
(2-1) U004XX error code table: Interrupted phase B	142
(2-2) U006XX error code table: Problems with the unit	143
(2-3) U008XX error code table: Page transmission error	143
(2-4) U009XX error code table: Page reception error	143
(2-5) U010XX error code table: G3 transmission	144
(2-6) U011XX error code table: G3 reception	146
(2-7) U017XX error code table: V.34 transmission	148
(2-8) U018XX error code table: V.34 reception	148
(2-9) U023XX error code table: Relay command abnormal reception	148
(2-10) U044XX error code table: Encrypted transmission	148
1-4-7 Send error code	149
(1) Scan to SMB error codes	149
(2) Scan to FTP error codes	150
(3) Scan to E-mail error codes	151
(4) Network Twain error codes	152
(5) Software trouble error codes	152
Assembly and Disassembly	153
1-5-1 Precautions for assembly and disassembly	153
(1) Precautions	153
(2) Drum	153
(3) Toner	153
(4) How to tell a genuine Kyocera Mita toner container	154
1-5-2 Outer covers	155
(1) Detaching and refitting the left cover and right cover	155
1-5-3 Paper feed section	158
(1) Detaching and refitting the paper feed assembly (paper feed roller and pickup roller)	158
(2) Detaching and refitting the retard roller assembly	160
(3) Detaching and refitting the MP paper feed roller	162
(4) Note on removing and Installing the upper registration roller and lower registration roller	164
1-5-4 Optical section	165
(1) Detaching and refitting the DP	165
(2) Detaching and refitting the scanner unit	166
(3) Detaching and refitting the laser scanner unit (LSU)	169
(4) Replacing the image scanner unit (ISU)	173
(5) Detaching and refitting the exposure lamp and inverter PWB	179
1-5-5 Developing section	181
(1) Detaching and refitting the developing unit	181
1-5-6 Drum section	182
(1) Detaching and refitting the drum unit	182
(2) Detaching and refitting the main charger unit	183
1-5-7 Transfer/separation section	184
(1) Detaching and refitting the transfer roller	184
1-5-8 Fuser section	186
(1) Detaching and refitting the fuser unit	186
(2) Switching the fuser pressure	190
1-5-9 PWBs	191
(1) Detaching and refitting the control PWB	191
(2) Detaching and refitting the power source PWB	194
(3) Detaching and refitting the high voltage PWB	197
(4) Detaching and refitting the scanner PWB	201
(5) Detaching and refitting the FAX PWB	202
1-5-10 Others	203
(1) Detaching and refitting the main motor	203
(2) Direction of installing the left cooling fan motor, right cooling fan motor and power source fan motor	204
1-5-11 DP	205
Requirements on PWB Replacement	207
1-6-1 Upgrading the firmware	207
1-6-2 Remarks on control PWB replacement	208
Mechanical Construction	209
2-1-1 Paper feed/conveying section	209
(1) Cassette paper feed section	209
(2) MP tray paper feed section	210
(3) Paper conveying section	211
2-1-2 Drum section	212
(1) Drum section	212
(2) Main charger unit	213
2-1-3 Optical section	214
(1) Scanner unit	214
(2) Image scanner unit (ISU)	215
(3) Laser scanner unit	217
2-1-4 Developing section	219
2-1-5 Transfer/separation section	220
2-1-6 Cleaning section	221
2-1-7 Fuser section	222
2-1-8 Paper exit section	224
2-1-9 Duplex/conveying section	226
2-1-10 DP section	227
Electrical Parts Layout	229
2-2-1 Electrical parts layout	229
(1) PWBs	229
(2) Switches and sensors	231
(3) Other electrical components	232
(4) DP	233
Operation of the PWBs	235
2-3-1 Power source PWB	235
2-3-2 Control PWB	237
2-3-3 Scanner PWB	243
2-3-4 DP driver PWB	246
Appendixes	247
2-4-1 Appendixes	247
(1) Wiring diagram	247
(2) Repetitive defects gauge	249

Match case Limit results 1 per page

2JN

1-4-17

1-4-4

Electric problems

Problem

Causes

Check procedures/corrective measures

(1)The machine does

not operate when the

main power switch is

turned on.

No electricity at the power

outlet.

Measure the input voltage.

The power cord is not

plugged in properly.

Check the contact between the power plug and the outlet.

The top cover is not closed

completely.

Check the top cover.

Broken power cord.

Check for continuity. If none, replace the cord.

Defective main power

switch.

Check for continuity across the contacts. If none, replace the

power source PWB (See page 1-5-42).

Blown fuse in the power

source PWB.

Check for continuity. If none, remove the cause of blowing and

replace the power source PWB (See page 1-5-42).

Defective interlock switch.

Check for continuity across the contacts of interlock switch. If

none, replace the power source PWB (See page 1-5-42).

Defective power source

PWB.

Replace the power source PWB (See page 1-5-42).

Defective control PWB.

Replace the control PWB (See page 1-5-39).

(2)Right cooling fan

motor does not oper-

ate.

Broken right cooling fan

motor coil.

Check for continuity across the coil. If none, replace the right cool-

ing fan motor.

Defective harness between

right cooling fan motor and

control PWB (YC27), or

improper connector inser-

tion.

Reinsert the connector. Also check for continuity within the con-

nector harness. If none, remedy or replace the harness.

Defective control PWB.

Replace the control PWB (See page 1-5-39).

(3)Left cooling fan

motor does not oper-

ate.

Broken left cooling fan

motor coil.

Check for continuity across the coil. If none, replace the left cool-

ing fan motor.

Defective harness between

left cooling fan motor and

control PWB (YC104), or

improper connector inser-

tion.

Reinsert the connector. Also check for continuity within the con-

nector harness. If none, remedy or replace the harness.

Defective control PWB.

Replace the control PWB (See page 1-5-39).

(4)Power source fan

motor does not oper-

ate.

Broken power source fan

motor coil.

Check for continuity across the coil. If none, replace the power

source fan motor.

Defective harness between

power source fan motor and

control PWB (YC107), or

improper connector inser-

tion.

Reinsert the connector. Also check for continuity within the con-

nector harness. If none, remedy or replace the harness.

Defective control PWB.

Replace the control PWB (See page 1-5-39).

(5)Registration clutch

does not operate.

Broken registration clutch

coil.

Check for continuity across the coil. If none, replace the registra-

tion clutch.

Defective harness between

registration clutch and con-

trol PWB (YC20), or

improper connector inser-

tion.

Reinsert the connector. Also check for continuity within the con-

nector harness. If none, remedy or replace the harness.

Defective control PWB.

Replace the control PWB (See page 1-5-39).