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HP LaserJet M1005 Service Manual - Page 66

Overcurrent/overvoltage, High-voltage power distribution

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Overcurrent/overvoltage There are two overvoltage devices in this device: ● Fuse F101 provides overcurrent protection for the fusing system circuitry. ● Fuse F102 (110 V devices only) provides overcurrent protection to the device dc power supply circuitry. You can check or replace the fuses by removing the left cover. NOTE If either of these fuses fail, replace the engine power supply. See Power supply on page 91. High-voltage power distribution The high-voltage power supply applies an overlap of dc and ac voltage to the primary charging roller and to the developing roller. This circuit also applies a positive or negative dc voltage to the transfer roller according to the instructions from the engine control unit. This circuit also controls the image density by changing the primary ac voltage and the developing ac bias according to the print density setting. High voltage is disabled when the print-cartridge door is open. The following figure shows this process. 50 Chapter 5 Theory of Operation ENWW

Section	Page
Device information	17
Quick access to device information	18
Model and serial number label	19
Features at a glance	20
Walkaround	21
General guidelines	22
Choosing paper and other media	22
HP media	22
Media to avoid	22
Media that can damage the device	23
Guidelines for using media	24
Paper	24
Colored paper	25
Custom-size media	25
Labels	25
Label construction	25
Transparencies	25
Envelopes	26
Envelope construction	26
Envelopes with double-side seams	26
Envelopes with adhesive strips or flaps	27
Envelope storage	27
Card stock and heavy media	27
Card stock construction	27
Card stock guidelines	27
Letterhead and preprinted forms	28
Supported media weights and sizes	29
Printing and storage environment	30
Installation	31
What is in the box	32
Site requirements	33
Physical specifications	33
Space requirements	33
Loading media	34
Loading documents to copy or scan	34
Loading input trays	34
Main input tray (tray 1)	34
Priority input tray	35
Connect power	36
Minimum system requirements	37
Supported operating systems	37
Software installation	38
Printer driver	39
Printer-driver Help	39
Changing printer-driver settings	40
Software for Windows	41
HP LaserJet Scan software	41
Installing Windows device software	41
Uninstalling Windows device software	41
Uninstalling Macintosh device software	41
Managing the device	43
Control panel	44
Information pages	45
Managing supplies	46
Checking supplies status	46
Storing supplies	46
Replacing and recycling supplies	46
HP policy on non-HP supplies	46
HP fraud hotline	47
Supplies	48
Cable and interface accessories	48
User-replaceable parts	48
Paper and other print media	48
Maintenance	51
Cleaning the device	52
To clean the exterior	52
To clean the scanner glass	52
To clean the lid backing	52
To clean the paper path	53
Print cartridge	54
Approximate print-cartridge replacement intervals	54
Managing the print cartridge	54
Print-cartridge life expectancy	54
Print-cartridge storage	54
HP policy on non-HP print cartridges	54
HP fraud hotline	54
Replacing supplies and parts	56
Supply replacement guidelines	56
Changing the print cartridge	56
Theory of Operation	59
Basic functions	60
Basic sequence of operation	61
Formatter system	62
Central processing unit	62
Standard boot process	62
Device startup messages	62
RAM	63
Universal serial bus (USB) interface	63
Control panel	63
EconoMode	63
Device functions	64
Engine control system (engine control unit and power-supply assembly)	64
Device engine control system	65
Device laser/scanner unit	65
Power system on the power-supply assembly	65
Image-formation system	67
The seven image-formation processes	68
Print cartridge	69
Device paper-feed system	69
Jam detection in the device	70
Conditions of jam detection	70
HP LaserJet M1005 MFP unique components	72
Scanner functions and operation	72
Scanner functions	72
Scanner operation	73
Removal and replacement	75
Removal and replacement strategy	76
Admonitions	76
Required tools	76
Before performing service	77
After performing service	77
Parts removal order	77
Flatbed lid	79
Control-panel overlay	80
Control panel	81
Scanner assembly	83
Device separation pad	89
Print cartridge	90
Device pickup roller	91
Media input tray	94
Transfer roller	96
Device side covers	98
Print-cartridge door	101
Rear cover and fuser cover	102
Front cover	104
Installing the scanner cushions	106
Power supply	107
Formatter	110
Scanner support frame	111
Engine controller unit	114
Laser/scanner assembly	118
Main motor	119
Fuser	121
Paper-pickup assembly	123
Troubleshooting	125
Basic troubleshooting	126
Control-panel messages	129
Alert and warning messages	129
Critical error messages	129
Event-log codes	131
Solving image-quality problems	132
Checking the print cartridge	132
To redistribute the toner in the print cartridge	132
Solving print image-quality problems	132
Print image-quality problems	132
Solving scanning (copying) image-quality problems	140
Scanning (copying) image-quality problems	140
Repetitive image defect ruler	146
Solving paper-feed problems	147
Jams occur in the device	147
To clear a jam	147
Solving print paper-feed problems	148
Print paper-feed problems	149
Functional checks	151
Half self-test functional check	151
To perform a half self-test check	151
To perform other checks	151
Drum rotation functional check	152
High-voltage contacts check	153
To check the print-cartridge contacts	153
To check the high-voltage connector pins	154
Firmware update using a flash executable file	155
Troubleshooting tools	156
Printing a configuration report, demonstration page, or menu structure	156
Service-mode functions	157
Secondary service menu	157
To gain access to the secondary service menu	157
Adjusting the country/region code parameters	158
To change the country/region from one location to another	158
To set the language and location if none is set	158
NVRAM init	158
To perform NVRAM init	159
System settings for localized products	159
Main wiring	162
Component locations	164
Parts and diagrams	167
Ordering parts and supplies	168
Parts that wear	168
Parts	168
World-wide customer support	168
Accessories	169
Common hardware	169
How to use the parts lists and diagrams	170
Scanner assembly	172
Formatter	174
Whole unit replacement part	176
Alphabetical parts list	192
Numerical parts list	196
Device specifications	201
Physical specifications	202
Electrical specifications	202
Power consumption	202
Environmental specifications	202
Acoustic emissions	203
Product warranty	205
Hewlett-Packard Limited Warranty Statement	206
Availability of support and service	207
HP maintenance agreements	208
Next-Day Onsite Service	208
Regulatory information	209
FCC compliance	210
Declaration of conformity	211
Country-/region-specific safety statements	212
Laser safety statement	212
Canadian DOC statement	212
Korean EMI statement	212
Finnish laser statement	213