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HP Color LaserJet CP2020 Service Manual - Page 88

Step 2: laser-beam exposure, Developing stage, Step 3: development

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Step 2: laser-beam exposure The laser beam scans the photosensitive drum to neutralize the negative charge on portions of the drum surface. An electrostatic latent image is formed where the negative charge is neutralized. Figure 5-11 Laser-beam exposure Laser beam Unexposed area Exposed area Developing stage The developing cylinder comes in contact with the photosensitive drum and deposits toner on the electrostatic latent image. Step 3: development Toner acquires a negative charge as a result of the friction from the developing cylinder rotating against the developing blade. When the negatively-charged toner comes in contact with the drum, it adheres to the electrostatic latent image. When the toner is on the drum, the image becomes visible. Figure 5-12 Development Developing blade Developing cylinder Exposed area Unexposed area Unexposed area Exposed area DC negative bias Photosensitive drum 68 Chapter 5 Theory of operation ENWW

Section	Page
Product basics	21
Quick access to product information	22
Product comparison	23
Product features	23
Walkaround	24
Front and side view	24
Back view	25
Model and serial numbers	25
Supported operating systems	26
Supported product software	27
Software included with the product	27
Recommended Installation for Windows	27
Express Installation	27
Macintosh software	27
Printer driver	27
Other software provided	28
Software for Windows	28
HP ToolboxFX	28
Software for Macintosh	28
PostScript Printer Description (PPD) files	28
Configure the product using a Macintosh	28
Status Alerts software	28
Software for networks	28
HP Web Jetadmin	28
Embedded Web server	29
Linux	29
System requirements	29
Windows requirements	29
Macintosh requirements	29
Connectivity	30
Supported network operating systems	30
Printer sharing disclaimer	30
Supported network protocols	30
Control panel	33
Control-panel walkaround	34
Control-panel menus	35
Use the menus	35
Reports menu	36
System setup menu	37
Service menu	39
Network config. menu	40
Paper and print media	41
Understand paper and print media use	42
Supported paper and print media sizes	43
Supported paper types and tray capacity	45
Special paper or print media guidelines	47
Load paper and print media	48
Manage and maintain	51
Information pages	52
HP ToolboxFX	53
Open HP ToolboxFX	53
Status	53
Event log	53
Alerts	54
Set up Status Alerts	54
Set up E-mail Alerts	54
Product information	54
Set password	54
Help	55
Device Settings	56
Device Information	56
Paper Handling	57
Printing	57
PCL5c	57
PostScript	57
Print Quality	58
Print Density	58
Paper Types	58
System Setup	58
Save/Restore Settings	58
Password	58
Service	59
Network Settings	59
Shop for Supplies	59
Other Links	59
Embedded Web server	60
View the HP embedded Web server	60
Embedded Web server sections	61
HP Web Jetadmin	63
Manage supplies	64
Supplies life	64
Print-cartridge storage	64
HP policy on non-HP print cartridges	64
HP fraud hotline and Web site	64
Print when cartridge is out	65
Replace print cartridges	66
Memory and font DIMMs	70
Product memory	70
Install memory and font DIMMs	70
Enable memory	74
Enable memory for Windows	74
Check DIMM installation	74
Clean the product	74
Firmware updates	75
Theory of operation	77
Basic operation	78
Major product systems	78
Product components	79
Sequence of operation	80
Engine control system	81
DC controller	82
Low-voltage power supply	83
High-voltage power supply	84
Laser/scanner system	85
Laser failure detection	85
Image-formation system	86
Image-formation process	86
Latent-image formation stage	87
Step 1: primary charging	87
Step 2: laser-beam exposure	88
Developing stage	88
Step 3: development	88
Transfer stage	89
Step 4: primary transfer	89
Step 5: secondary transfer	89
Step 6: separation from the drum	90
Fusing stage	90
Step 7: fusing	90
ITB cleaning stage	91
Step 8: ITB cleaning	91
Drum cleaning stage	92
Step 9: drum cleaning	92
Pickup-and-feed system	93
Jam detection	95
Removal and replacement	97
Removal and replacement strategy	98
General cautions during removal and replacement	98
Electrostatic discharge	98
Required tools	99
Types of screws	99
Before performing service	100
After performing service	100
Post-service test	101
Print-quality test	101
Print cartridges	102
Tray 2 cassette	103
Rollers and pads	104
Transfer roller	104
Paper-pickup roller	105
Separation roller	107
Reinstall the separation roller	109
Paper-pickup roller (Tray 1)	110
Separation pad (Tray 1)	112
Components and major assemblies	113
Link guide	113
DIMM cover	114
Print-cartridge drawer	115
Intermediate transfer belt (ITB)	117
Reinstall the ITB	120
Paper-feed guide assembly	121
Rear-door stopper and link caps (simplex product)	123
Rear door (simplex product)	124
Rear door (duplex product)	126
Right cover	128
Reinstall the right cover	130
Rear-upper cover (duplex product)	131
Rear cover and feed guide (simplex product)	132
Rear-lower cover and rear-door links (duplex product)	136
Rear-door rib assembly (duplex product)	139
Upper-cover assembly	141
Reinstall the upper cover	143
Control-panel assembly	144
Left cover	146
Reinstall the left cover	147
High-voltage power-supply PCA	149
Color-misregistration sensor assembly PCA	152
Reinstall the color-misregistration sensor assembly	155
Right panel	156
Motors (M1 and M2)	160
DC controller PCA	162
Special considerations	162
Remove the DC controller PCA	162
Formatter PCA	164
Special considerations	164
Remove the formatter PCA	164
Fan	166
Intermediate PCA	167
Right-front cover and power button	168
Power-supply sub PCA	170
Fuser motor assembly	174
Reinstall the fuser motor assembly	178
Duplex reverse-drive assembly	179
Fuser	182
Reinstall the fuser	187
Paper-delivery assembly	188
Front-door assembly	191
Reinstall the front-door assembly	196
Problem solve	199
Introduction	200
Solve problems checklist	201
Menu map	201
Troubleshooting process	202
Pretroubleshooting checklist	202
Power-on checks	204
Tools for troubleshooting	205
Print-quality troubleshooting tools	205
Calibrate the product	205
Problem-solve diagrams	206
Repetitive image defects	206
Interface ports	207
DC controller PCA	208
Major components	210
Solenoids, clutches, and sensors	211
Rollers	212
Motors and fans	213
PCAs	214
Timing diagram	215
Circuit diagram	216
Control-panel messages	217
Pages and reports	221
Diagnostic page	221
Configuration page	221
Supplies status page	221
Event log	222
Paper-handling problems	224
Clear jams	224
Common causes of jams	224
Jam locations	225
Change Jam Recovery setting	225
Clear jams in Tray 1	226
Clear jams in Tray 2	228
Clear jams in Tray 3	229
Clear jams in fuser area	230
Clear jams in output bin	231
Clear jams in duplexer (duplexing models only)	232
Image defects	234
General print quality issues	234
Solve issues with color documents	238
Solve connectivity problems	240
Solve direct-connection problems	240
Solve network problems	240
Service mode functions	242
Service menu	242
Service menu settings	242
Restore the factory-set defaults	242
Secondary service menu	242
Open the secondary service menu	242
Secondary service menu structure	242
Engine resets	244
Engine test page	244
Cold reset	244
NVRAM initialization	245
Performance problems	246
Print speeds	247
Parts and diagrams	249
Order parts, accessories, and supplies	250
Order directly from HP	250
Part numbers	250
Supplies	250
Memory	250
Cable and interface accessories	251
Paper-handling accessories	251
User-replaceable parts	251
Whole unit replacement	251
Screws	252
How to use the parts lists and diagrams	253
External components	254
Covers, panels, and doors	254
Internal components	256
Internal components (1 of 7)	256
Internal components (2 of 7)	258
Internal components (3 of 7)	260
Internal components (4 of 7)	262
Internal components (5 of 7)	264
Internal components, simplex products (6 of 7)	266
Internal components, duplex products (7 of 7)	268
Major assemblies	270
Cassette (Tray 2)	270
Fuser assembly	272
PCAs	274
Optional 250-sheet paper cassette	276
Alphabetical parts list	278
Numerical parts list	281
Service and support	285
Hewlett-Packard limited warranty statement	286
Customer self repair warranty service	287
Print cartridge limited warranty statement	288
Customer support	289
Repack the product	290
Service information form	291
Specifications	293
Physical specifications	294
Electrical specifications	295
Acoustic emissions	296
Environmental specifications	296
Regulatory information	297
FCC regulations	298
Declaration of conformity	299
Safety statements	300
Laser safety	300
Canadian DOC regulations	300
VCCI statement (Japan)	300
Power cord statement (Japan)	300
EMI statement (Korea)	300
Laser statement for Finland	301
Substances Table (China)	302
Certificate of Volatility	303
Types of memory	303
Volatile memory	303
Non-volatile memory	303