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HP 2605 Service Manual - Page 74

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Figure 4-6 Developing stage The toner has an insulating property and has negative charge potential from friction with the rotating developing cylinder and the developing blade surface. The area of the photosensitive drum, where the laser beam is exposed, has higher potential than the toner, which is charged negatively on the cylinder. When this area contacts the toner layer (negatively charged), the toner jumps onto the drum surface by the potential difference between the drum surface and the cylinder (higher potential on drum side). This is called the projection development and it visualizes the electrostatic latent image on the drum. The developing cylinder is applied the AC bias in order to make the toner jump easier onto the drum surface and improve the contrast of the output image. This printer is able to adjust the image density by changing the potential difference between the cylinder and the photosensitive drum surface according to changes of the developing DC bias based on the IMAGE DENSITY INFORMATION signal sent from the formatter. The developing sheet improves the print quality and also prevents toner from scattering. Print cartridge The cartridge forms a visible toner image on the photosensitive drum. There are four print cartridges: magenta (M), cyan (C), yellow (Y), and black (K). 64 Chapter 4 Operational theory ENWW

Section	Page
Printer basics	11
Printer configurations	12
HP Color LaserJet 2605 printer	12
HP Color LaserJet 2605dn printer	12
HP Color LaserJet 2605dtn printer	13
Printer features	14
Walkaround	16
Software	18
Software and supported operating systems	18
Print-media specifications	19
General guidelines	19
Paper and print media	19
Printing and storage environment	20
Envelopes	20
Labels	22
Transparencies	23
HP LaserJet glossy paper and HP LaserJet Photo paper	23
Letterhead or preprinted forms	23
HP LaserJet Tough paper	23
Custom-sized print media or cardstock	24
Supported media weights and sizes	24
Installation	27
Site preparation	28
Operating environment	28
Minimum system requirements	29
Requirements for PC systems	29
Requirements for Macintosh systems (non-PostScript)	29
Package contents	30
Install input devices	31
Installing Tray 3 (2605dtn)	31
Loading Tray 1	31
Loading Trays 2 and 3	33
Managing and maintenance	39
Control panel menus	40
Using the control panel menus	40
Control panel menu map	40
Managing supplies	42
Supplies life	42
Checking and ordering supplies	42
To check status and order using the control panel	42
To check and order supplies using HP ToolboxFX	42
To check and order using HP Web Jetadmin	43
Storing supplies	43
Replacing and recycling supplies	43
HP policy on non-HP supplies	43
Resetting the printer for non-HP supplies	43
HP anti-counterfeit website	44
Cleaning the printer	45
To remove toner build-up	45
To clean the paper path using HP ToolboxFX	47
Cartridge out override	48
Configuration	48
On-going operation	48
Calibrating the printer	49
To calibrate the printer at the printer	49
To calibrate the printer from the HP ToolboxFX	49
Managing the printer	50
Device pages and reports	50
Demo page	50
Configuration page	50
Supplies Status page	51
Networking page	53
Fonts pages	53
Usage page	53
Menu map	53
HP ToolboxFX	54
To view HP ToolboxFX	54
Status	55
Event log	55
Alerts	56
Set up status alerts	56
Set up e-mail alerts	56
Help	56
Device settings	57
Device information	57
Paper handling	58
Printing	58
PCL5e	58
PostScript	59
Print quality	59
Print density	59
Paper types	60
Memory card (HP Color LaserJet 2605dtn)	60
System setup	61
Service	61
Network settings	61
Using the embedded Web server	61
To access the embedded Web server using a network connection	62
Information tab	62
Settings tab	63
Networking tab	63
Other links in HP ToolboxFX	63
Operational theory	65
Engine control system	66
Basic sequence of operation	66
Power-on sequence	67
Motors and fans	67
Main motor failure detection	68
Fan motor failure detection	68
Image formation system	69
Image formation process	71
Latent image formation	72
Laser/scanner system	73
Developing stage	73
Print cartridge	74
Transfer belt (ETB)	75
Transfer stage	76
Separation stage	77
Fusing stage	77
Pickup and feed system	79
Manual feed slot pickup mechanism	81
Paper feed mechanism	81
Skew correction by the registration shutter	81
Jam detection	82
Solenoid, motor, and fan locations	83
Printed circuit assembly locations	83
250-sheet tray solenoid and printed circuit locations	84
Duplexing mechanism	85
Service-only tools (SERVICE ONLY)	90
General timing chart	90
Printer calibration	91
Removal and replacement	93
Overview	94
Service approach	95
Pre-service procedures	95
Removal and replacement procedures	96
Print cartridge replacement	96
ETB removal and replacement	99
Fuser removal and replacement	107
Formatter removal and replacement	115
DC controller removal and replacement	118
Separation assembly removal and replacement	121
Paper-pickup roller removal and replacement	122
Control panel removal and replacement	124
Memory-card assembly removal and replacement	129
Duplexing drive unit removal and replacement	134
Duplexing-driver PCA removal and replacement	139
Troubleshooting	143
Troubleshooting process	144
Troubleshooting checklist	144
Control-panel messages	146
Alert and warning messages	146
Status-log messages	150
Clearing jams	152
Where to look for jams	152
To clear jams from inside the printer	153
To clear jams from the duplex area (HP Color LaserJet 2605dn and 2605dtn models only)	154
To clear jams from the top bin (HP Color LaserJet 2605)	156
To clear jams from the top output area (HP Color LaserJet 2605dn and 2605dtn models only)	157
To clear jams from Tray 2 or optional Tray 3	159
E-Label reader guide pin damage	160
Print problems	161
Printed image quality problems	161
Improving print quality	161
Paper Types menu	161
Print Modes menu	161
Print quality menu	162
Understanding print-quality settings	163
To temporarily change print-quality settings	163
To change print-quality settings for all future jobs	163
Identifying and correcting printed image defects	163
Print-quality checklist	164
General print quality issues	164
Solving issues with color documents	168
Paper handling issues	170
Wrong size/type media	170
Cannot select a tray or feature to use	171
Performance problems	171
Functional tests (SERVICE ONLY)	173
Engine-test print	173
Service mode functions (SERVICE ONLY)	174
Cold reset	174
NVRAM initializer	174
Super NVRAM initializer	174
Restoring page counts and serial number	175
Cleaning the ETB	175
Troubleshooting tools	176
Printer pages and reports	176
Demo page	176
Configuration page	177
Supplies Status page	177
Fuser cleaning page	177
Print quality troubleshooting pages	177
Status log	177
Event log	178
Service menu	179
Service menu settings	179
Restoring the factory-set defaults	179
To restore the factory-set defaults	179
Secondary service menu	179
HP ToolboxFX	181
HP ToolboxFX	181
To view HP ToolboxFX	181
Troubleshooting tab	181
Print quality troubleshooting pages	181
Printer calibration	181
Cleaning page	182
Configuration page	182
Diagnostic resources	183
Reports menu	183
Network/Web diagnostics tools	183
Repetitive-image-defect ruler	184
Firmware and software updates	185
Parts and diagrams	187
Overview	188
Assembly locations	192
Covers	198
Internal assemblies	202
Input devices	220
Diagrams	232
Alphabetical parts list	233
Numerical parts list	236
Specifications	239
Printer specifications	240
Service and support	243
Hewlett-Packard limited warranty statement	244
Print Cartridge Limited Warranty Statement	245
HP Customer Care	246
Availability of support and service	248
HP Care Pack™ Services and Service Agreements	248
Repacking the printer	249
To repack the printer	249
Service information form	250
Regulatory information	251
Introduction	252
FCC regulations	253
Environmental Product Stewardship program	254
Protecting the environment	254
Ozone production	254
Power consumption	254
HP LaserJet printing supplies	254
Disposal of waste equipment by users in private households in the European Union	255
Material safety data sheet	256
Declaration of conformity	257
Country/region-specific safety statements	258
Laser safety statement	258
Canadian DOC statement	258
Korean EMI statement	258
VCCI statement (Japan)	258
Finnish laser statement	259

Match case Limit results 1 per page

Figure 4-6

Developing stage

The toner has an insulating property and has negative charge potential from friction with the rotating

developing cylinder and the developing blade surface.

The area of the photosensitive drum, where the laser beam is exposed, has higher potential than the

toner, which is charged negatively on the cylinder. When this area contacts the toner layer

(negatively charged), the toner jumps onto the drum surface by the potential difference between the

drum surface and the cylinder (higher potential on drum side). This is called the projection

development and it visualizes the electrostatic latent image on the drum. The developing cylinder is

applied the AC bias in order to make the toner jump easier onto the drum surface and improve the

contrast of the output image.

This printer is able to adjust the image density by changing the potential difference between the

cylinder and the photosensitive drum surface according to changes of the developing DC bias based

on the IMAGE DENSITY INFORMATION signal sent from the formatter.

The developing sheet improves the print quality and also prevents toner from scattering.

Print cartridge

The cartridge forms a visible toner image on the photosensitive drum. There are four print cartridges:

magenta (M), cyan (C), yellow (Y), and black (K).

Chapter 4

Operational theory

ENWW