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HP P2015 Service Manual - Page 90

Step 3: Developing, Step 4: Transfer,

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The laser beam scans the photosensitive drum to neutralize negative charges on parts of the drum. An electrostatic latent image is formed on the drum where negative charges were neutralized. Step 3: Developing The developing cylinder comes in contact with the photosensitive drum to deposit toner onto the electrostatic latent image. NOTE The charges on the exposed area of the drum are shown as positive in Figure 5-9 Developing on page 80. The charges are actually negative, but they are more positive than the charges on the developing cylinder. Figure 5-9 Developing Toner acquires a negative charge through friction from the developing cylinder and the blade. When the negatively charged toner comes in contact with the drum, the toner adheres to the electrostatic latent image. The image on the drum becomes visible because of the toner. Step 4: Transfer The transfer charging roller, to which a dc positive bias is applied, imparts a positive charge on the print media. When the print media comes in contact with the photosensitive drum, the toner is transferred to the print media. 80 Chapter 5 Theory of operation ENWW

Section	Page
Product information	11
Product features	12
HP LaserJet P2015 printer	12
HP LaserJet P2015d printer	12
HP LaserJet P2015n printer	13
HP LaserJet P2015dn printer	13
HP LaserJet P2015x printer	13
Identify product parts	14
Control panel	16
Supported paper and other media	17
Optimize print quality for media types	17
Guidelines for using media	18
HP media	18
Media to avoid	18
Media that can damage the printer	18
Paper	19
Labels	19
Label construction	19
Transparencies	19
Envelopes	19
Envelope construction	20
Envelopes with double-side seams	20
Envelopes with adhesive strips or flaps	20
Envelope storage	20
Card stock and heavy media	21
Card stock construction	21
Card stock guidelines	21
Letterhead and preprinted forms	21
Load media	23
Tray 1	23
Tray 2 and optional tray 3	24
Straight-through output path	24
Manual feed	25
Media type and tray loading	25
Installation	27
Site preparation	28
Package contents	29
Install tray 3	30
Install printer software	31
Supported operating systems	31
Drivers	31
Windows printer drivers	31
Macintosh printer driver	31
Driver downloads	31
Installing software on Microsoft® Windows	32
Installing software on Macintosh OS X V10.2.8, V10.3.9, and V10.4.3	33
Uninstaller	33
Printer information pages	35
Demo page	35
Configuration page	35
Supplies Status page	35
Network Configuration page	35
Manage the printer	37
HP ToolboxFX	38
To view HP ToolboxFX	38
Status	39
Alerts	40
Set up status alerts	40
Set up e-mail alerts	40
Help	40
Device settings	41
Device information	41
Paper handling	42
Print quality	42
Paper types	42
System setup	43
Service	43
Print settings	43
Printing	43
PCL 5e	43
PCL 6	43
PostScript®	44
Network settings	44
Embedded Web server	45
Open the embedded Web server	45
Status tab	46
Settings tab	46
Networking tab	46
Links	47
Maintenance	49
Replace the print cartridge	50
Redistribute toner	52
Clean the printer	53
Clean the print-cartridge area	53
Clean the printer media path	54
Clean the pickup roller (tray 1)	56
Replace the pickup roller (tray 1)	61
Clean the pickup roller (tray 2)	65
Replace the pickup roller (tray 2)	72
Theory of operation	79
Introduction	80
Internal components	81
Timing	83
Engine control system	84
Laser/scanner system	86
Pickup/feed/delivery system	87
Image-formation system	89
Removal and replacement	93
Introduction	94
Removal and replacement strategy	94
Electrostatic discharge	94
Required tools	94
Before performing service	95
Pre-service procedures	95
Parts removal order	95
Covers	96
Left-side cover	96
Right-side cover	96
Back cover	97
Duplexer tray (HP LaserJet P2015d, P2015dn, and P2015x printers only)	99
Top cover	100
Control panel	105
Formatter	107
Laser/scanner	108
Memory-tag-reader assembly	109
Duplex-drive PCA (HP LaserJet P2015d, P2015dn, and P2015x printers only)	111
Fuser	113
Fan	113
Duplex-drive gears (HP LaserJet P2015d, P2015dn, and P2015x printers only)	114
Duplex solenoid (HP LaserJet P2015d, P2015dn, and P2015x printers only)	116
Fuser	117
Interlock assembly	128
ECU	129
Main motor	136
Pickup and feed assemblies	138
Transfer roller	138
Registration assembly	139
Main gear assembly/tray 2 pickup solenoid	140
Print-cartridge door	144
Problem solving	147
Basic problem solving	148
Status-light patterns	150
Fatal error secondary messages	157
Accessory error secondary messages	160
Media problemsolving	161
Printed page is different from what appeared on screen	163
Garbled, incorrect, or incomplete text	163
Missing graphics or text, or blank pages	163
Page format is different from another HP LaserJet printer	164
Graphics quality	164
Image problem solving	165
Light print or faded	165
Toner specks	165
Dropouts	165
Vertical lines	166
Gray background	166
Toner smear	166
Loose toner	167
Vertical repetitive defects	167
Misformed characters	167
Page skew	168
Curl or wave	168
Wrinkles or creases	168
Toner scatter outline	169
Clear jams	170
Print-cartridge area	170
Input trays	172
Output bin	175
Straight-through output path	176
Automatic two-sided printing path	177
Diagnostic resources	182
Engine test	182
Continuous self-test	182
Half self-test functional check	183
Drum rotation functional check	183
Heating element check	183
High-voltage contacts check	184
Checking the print cartridge contacts	184
Checking the high-voltage connector assembly	185
Network-setup problemsolving	186
Reset the printer	187
NVRAM initialization	187
Super NVRAM initialization	187
Network reset	188
Cold reset	188
Troubleshooting tools and reference diagrams	189
Repetitive image defects	189
General timing chart	190
Circuit diagram	191
Solenoids	193
Switches and sensors	194
Rollers and pads	195
Parts and diagrams	197
Order parts and supplies	198
Parts	198
Related documentation and software	198
Supplies	198
Assembly locations	200
Covers	204
Internal assemblies	208
Alphabetical parts list	238
Numerical parts list	249
Accessory/Consumable addendum	261
Consumables and accessories	262
10/100 networking print servers	262
HP print cartridges	263
HP policy on non-HP print cartridges	263
Storing print cartridges	263
Print cartridge life expectancy	263
Saving toner	263
DIMMs (memory or font)	264
Install a DIMM	264
Test the DIMM installation	266
Remove a DIMM	266
Service and support	269
Hardware service	270
Extended warranty	270
Guidelines for repacking the printer	271
How to contact HP	271
Printer specifications	273
Environmental specifications	274
Acoustic emissions	274
Electrical specifications	275
Physical specifications	277
Printer capacities and ratings	278
Memory specifications	278
Port availability	278
Regulatory information	279
FCC compliance	280
Declaration of Conformity statements	281
Regulatory statements	282
Laser safety statement	282
Canadian DOC regulations	282
Korean EMI statement	282
Laser statement for Finland	283
Warranty and licensing	285
Hewlett-Packard limited warranty statement	286
Hewlett-Packard software license agreement	287
Limited warranty for print cartridge	288

Match case Limit results 1 per page

The laser beam scans the photosensitive drum to neutralize negative charges on parts of the drum.

An electrostatic latent image is formed on the drum where negative charges were neutralized.

Step 3: Developing

The developing cylinder comes in contact with the photosensitive drum to deposit toner onto the

electrostatic latent image.

NOTE

The charges on the exposed area of the drum are shown as positive in

Figure

Developing

page

. The charges are actually negative, but they are more positive than

the charges on the developing cylinder.

Figure 5-9

Developing

Toner acquires a negative charge through friction from the developing cylinder and the blade. When

the negatively charged toner comes in contact with the drum, the toner adheres to the electrostatic

latent image. The image on the drum becomes visible because of the toner.

Step 4: Transfer

The transfer charging roller, to which a dc positive bias is applied, imparts a positive charge on the

print media. When the print media comes in contact with the photosensitive drum, the toner is

transferred to the print media.

Chapter 5

Theory of operation

ENWW