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3.2 Troubleshooting Image Defects I-1 Light Possible cause Toner shortage ECONOMY mode Printing density setting  Paper failure Transfer roller failure Transfer input signal error Dirt on power supply terminal Failure in the transfer highvoltage circuit Insufficient LD light Step 1 2 3 4 5 6 7 8 Check Does printed image improve when the EP-ED HC cartridge is replaced? Is the ECONOMY mode active? Does printed image improve when printed density setting is changed on the control panel? During a printing, open the toner cartridge lid in the printer and pull out the EP-ED HC cartridge. Open the drum shutter of the EP-ED HC cartridge and check the toner image on the drum. Is the toner image before transfer is light? Does the print quality improve when fresh paper is used? Does the print quality improve when print is made with transfer roller changed? Do the pins 7 and 8 of the connector P6 on the main PCB have the following value respectively when a sheet of paper is fed from the MP tray? P6-7 pin (HVT2) --- Change in voltage from 15V approx. to 0V about 1 second after paper feeding. P6-8 pin (HVT3) --- Change in voltage from 9V approx. to 0V just when the voltage at the 7 pin changes from 0V to 15V. Clean the transfer roller right end bearing, the check continuity between the transfer roller power supply spring and the terminal of the high-voltage transfer unit. Is there continuity? Result Yes Yes Yes Yes Yes Yes No No Yes Remedy Replace EP-ED HC cartridge. Cancel the ECONOMY mode. Adjust the proper setting on the control panel. Go to the Step 9. Use recommended paper. Clean the transfer roller [Use dry lint-free paper (producing little paper dust) to clean the transfer roller. Never use solvents] and, if dirt subsists, replace the transfer roller assy. Replace the main PCB assy or the harness. Clean the contact to assure the continuity. Replace the high-voltage power supply assy. 9 Does print quality improve when the laser unit is improved? Yes Replace the laser unit or the harness. Continued to the following page VI-4

Section	Page
sm_hl2060.pdf	1
CONTENTS	4
CHAPTER I	4
CHAPTER II	4
CHAPTER III	5
CHAPTER IV	5
CHAPTER V	6
CHAPTER VI	6
CHAPTER VII	7
APPENDIX A	7
CHAPTER I GENERAL	8
1. FEATURES	8
2. SPECIFICATIONS	8
3. SAFETY INFORMATION	13
3.1 Laser Safety (110 ~ 120V Model only)	13
3.2 CDRH Regulations (110 ~ 120V Model only)	14
3.3 Additional Information	14
4. PARTS OF THE PRINTER	15
4.1 External Views	15
4.2 Cross Sectional View	16
5. STORAGE AND HANDLING OF EP-ED HC CARTRIDGES	17
5.1 Storage of Sealed EP-ED HC Cartridges	17
5.2 Storage of Unsealed EP-ED HC Cartridges	17
CHAPTER II THEORY OF OPERATION	18
1. BASIC OPERATIONS	18
1.1 Mechanical Configuration	18
1.2 Main Drive	19
1.3 Basic Sequence of Operations	20
2. LASER/SCANNER SYSTEM	21
3. IMAGE FORMATION SYSTEM	22
3.1 Outline	22
3.2 Printing Process	22
3.2.1 Electrostatic latent image formation stage	23
3.2.2 Developing stage	25
3.2.3 Transfer stage	26
3.2.4 Fixing stage	27
3.2.5 Drum cleaning stage	27
4. PAPER PICK-UP/FEED SYSTEM	29
4.1 Outline	29
4.2 Cassette Feed	30
4.3 MP Tray Feed	31
4.4 Paper Jam Detection	32
CHAPTER III ELECTRICAL SYSTEM	34
1. MAIN PCB	34
1.1 Outline	34
1.2 Video Controller Circuit	35
1.3 Engine Controller Circuit	39
2. PAPER FEED DRIVE CIRCUIT	40
3. DISPLAY CIRCUIT	42
3.1 Outline	42
3.2 Operation	42
4. LOW-VOLTAGE POWER SUPPLY ASSY	43
4.1 Outline	43
4.2 Protection Functions	43
5. HIGH-VOLTAGE POWER SUPPLY ASSY	45
5.1 Outline	45
5.2 Operation of the Components of the High-Voltage Power Supply Assy	45
CHAPTER IV MECHANICAL SYSTEM	48
Safety Precautions	48
PRINTER DISASSEMBLING PROCEDURE	49
PRINTER BODY	50
1.1 Configuration	50
1.2 Control Panel Unit	50
1.3 Toner Cartridge Lid	51
1.4 Side Cover L	51
1.5 Font Cover ASSY	52
1.6 Upper Cover ASSY, Rear Cover ASSY	52
1.6.1 Upper cover ASSY, Rear cover ASSY	52
1.6.2 Changeover guide, Jam remove cover	54
1.7 Side Cover R	54
1.8 DC Fan Motor	55
1.9 Main PCB	56
1.10 Laser Unit	58
1.11 Cartridge Stopper ASSY	59
1.12 Paper Feed Chassis Unit	60
1.13 Separation pad ASSY	62
1.14 MP PE Sub Actuator	62
1.15 P Feed /Size-sw PCB ASSY	63
1.16 Size-Switch Sprin	63
1.17 Regist sensor actuator	63
1.18 PE Sensor Actuator MP	64
1.19 Tray Sensor Holder	64
1.20 Roller Holder	65
1.21 Paper pick-up roller ASSY, Bearing	65
1.22 Paper Pick-up Solenoid	67
1.23 Paper Feed Motor ASSY	67
1.24 MP Tray Cover	68
1.25 MP Tray ASSY	69
1.26 Paper Path Separation Plate, Paper Path Separation Film	70
1.27 Latch	70
1.28 Fixing unit	71
1.29 Transfer Unit	74
1.30 DC Gear Holder ASSY	75
1.31 PS Switch Wire, Remote Switch	76
1.32 High-Voltage Power Supply PCB ASSY	76
1.33 Low-Voltage Power Supply PCB ASSY	77
1.34 Toner Cartridge (EP-ED HC Cartridge)	78
1.35 Paper Tray	79
CHAPTER V MAINTENANCE AND SERVICING	80
1. PERIODICAL REPLACEMENT PARTS	80
2. CONSUMABLE PARTS STANDARD ENDURANCE TABLE	80
3. LIST OF STANDARD TOOLS	81
4. LIST OF LUBRICANTS AND CLEANERS	82
CHAPTER VI TROUBLESHOOTING	83
1. INTRODUCTION	83
1.1 Initial Check	83
1.2 Basic Procedure	84
2. TEST PRINTING AND MECHANICAL CHECK	84
2.1 Test Printing	84
3. IMAGE DEFECTS	85
3.1 Image Defect Examples	85
3.2 Troubleshooting Image Defects	86
I-1 Light	86
I-2 Dark	87
I-3 Completely blank	88
I-4 All black	88
I-5 Polka dots	89
I-6 Dirt on back of paper	89
I-7, -8 Black vertical streaks or Blurred vertical line	90
I-9 Black and thin horizontal streaks	90
I-10 Black and blurred horizontal stripes	90
I-11 Dropout	91
I-12 White vertical streaks	91
I-13 Faulty registration	92
I-14 Poor fixing	92
4. TROUBLESHOOTING OF MALFUNCTIONS	93
M-1 No DC power supplied	93
M-2 Malfunction of LCD display on the control panel.	93
M-3 Malfunction of control panel LED lamps.	93
M-4 Malfunction of control panel switches	94
M-5 \	94
M-6 \	94
M-7 \	95
M-8 \	95
M-9 \	95
M -10 \	96
M-11 No paper pick-up from cassette (or MP tray)	96
M-12 \	97
M-13 \	99
M-14 \	99
M-15 \	99
M-16 \	100
5. TROUBLESHOOTING PAPER TRANSPORT PROBLEMS	101
5.1 Paper Jams	101
J-1a Paper pick-up block (Pick miss)	102
J-1b Paper pick-up block (Oblique feed jam)	102
J-2 Separation and feed block (Paper jam)	103
J-3 Fixing and paper delivery block (Paper jam)	103
5.2 Incomplete Paper Feed	104
F-1 Double feeding	104
F-2 Wrinkles	104
6. OPERATION	105
6.1 Line Inspection Mode Procedure	105
6.2 DRAM Test	108
7. STATUS MESSAGE LIST	109
Operator Call Messages	109
Error Messages	110
Service Call Messages	113
CHAPTER VII HIDDEN FUNCTIONS	115
1. HIDDEN FUNCTION LIST	115
1.1 Holding down Specified Key(s) at Power on	115
1.2 Off-line and Hold Down MODE + FF + CONT Keys	118
1.3 Off-line and Hold Down CONT + SEL Keys	131
Appendix A 1. Engine Block Diagram	136
Appendix A 2. Paper Feed/Size-SW PCB Circuitry Diagram (1/1	137
Appendix A 3. Main PCB Circuitry Diagram (1/7)	138
Appendix A 4. Main PCB Circuitry Diagram (2/7)	139
Appendix A 5. Main PCB Circuitry Diagram (3/7	140
Appendix A 6. Main PCB Circuitry Diagram (4/7	141
Appendix A 7. Main PCB Circuitry Diagram (5/7)	142
Appendix A 8. Main PCB Circuitry Diagram (6/7)	143
Appendix A 9. Main PCB Circuitry Diagram (7/7)	144
Appendix A 10. Control Panel PCB Circuitry Diagram (1/1)	145
Appendix A 11. Laser LD PCB Circuitry Diagram (1/1)	146
Appendix A 12. SERIAL NO. DESCRIPTIONS	147
pl_hl2060.pdf	149
Contents	151
Power cords, Harnesses	152
List	153
List	153
High-voltage PS	154
List	155
List	155
Covers	156
List	157
PCB attachments	158
List	159
List	159
Chassis	160
List	161
Paper feeder	162
List	163
Paper tray A4, LTR/LGL	164
List	165
List	165
Fixing unit	166
List	167
List	167
Packing materials	168
List	169

Match case Limit results 1 per page

VI-4

3.2

Troubleshooting Image Defects

I-1

Light

Possible cause

Step

Check

Result

Remedy

Toner shortage

Does printed image improve when the

EP-ED HC cartridge is replaced?

Yes

Replace EP-ED HC

cartridge.

ECONOMY

mode

Is the ECONOMY mode active?

Yes

Cancel the ECONOMY

mode.

Printing

density setting

Does printed image improve when printed

density setting is changed on the control

panel?

Yes

Adjust the proper setting

on the control panel.

During a printing, open the toner cartridge lid

in the printer and pull out the EP-ED HC

cartridge.

Open the drum shutter of the EP-ED HC

cartridge and check the toner image on the

drum.

Is the toner image before transfer is light?

Yes

Go to the Step 9.

Paper failure

Does the print quality improve when fresh

paper is used?

Yes

Use recommended paper.

Transfer roller

failure

Does the print quality improve when print is

made with transfer roller changed?

Yes

Clean the transfer roller

[Use dry lint-free paper

(producing little paper

dust) to clean the

transfer roller. Never use

solvents] and, if dirt

subsists, replace the

transfer roller assy.

Transfer input

signal error

Do the pins 7 and 8 of the connector P6 on the

main PCB have the following value

respectively when a sheet of paper is fed from

the MP tray?

P6-7 pin (HVT2) --- Change in voltage from

15V approx. to 0V about 1 second after paper

feeding.

P6-8 pin (HVT3) --- Change in voltage from 9V

approx. to 0V just when the voltage at the 7

pin changes from 0V to 15V.

Replace the main PCB

assy or the harness.

Dirt on power

supply terminal

Clean the transfer roller right end bearing, the

check continuity between the transfer roller

power supply spring and the terminal

Clean the contact to

assure the continuity.

Failure in the

transfer high-

voltage circuit

of the high-voltage transfer unit.

Is there continuity?

Yes

Replace the high-voltage

power supply assy.

Insufficient LD

light

Does print quality improve when the laser unit

is improved?

Yes

Replace the laser unit or

the harness.

Continued to the following page