HP PageWide Enterprise Color 765, MFP 780, MFP 785, Pro 755, MFP 774, MFP 779, Managed Color E75160, MFP E77650, E77660, P77440, P77940, P75250 Service Troubleshooting Manual, Parts List and Diagrams
This service manual contains information necessary to test, maintain, and service HP PageWide Enterprise Color 765, MFP 780, MFP 785, Pro 755, MFP 774, MFP 779, Managed Color E75160, MFP E77650, E77660, P77440, P77940, P75250 printers.
Table of contents:
1 Theory of operation 1
Basic operation 2
- Function structure 2
- Operation sequence 3
System control 6
- MPCA and data path 6
- Engine control 7
- Pen interface (I/F) 10
- Power supply 10
- AC control module 11
Cabling system 12
- Flat Flexible Cables 12
- FFC routing 15
- Discrete cables 18
- Ground wires 19
- Connectors 20
- Ferrites 22
- Cable management 22
Print subsystem 24
- Printhead 24
- Printhead air management system 25
- Printhead lift 25
- Print cartridges 25
- Optical scan carriage 25
- Print system operational states 25
Paper-handling system 28
- Printer sensors 28
- High Capacity Input (HCI) sensors 29
- 3x550 tray sensors 30
- 1x550 tray sensors 31
- Printer motors/solenoids 32
- High capacity input (HCI) motors/solenoids 33
- 3x550 tray motors/solenoids 34
- 1x550 tray motors/solenoids 35
- Printer printing system 36
- Input trays 36
- Paper path zones 40
- Jam detection 42
Servicing system 45
- Printhead wiper 45
Service fluid and aerosol management systems 46
Airflow system 48
- Function 48
- Heating 48
- Airflow 48
- Modes 48
- Components 49
Document feeder system 50
- Document feed system 50
- Rollers and sensors in the document feeder 50
- Document feeder operation 51
- Deskew operation 53
- Scanning and image capture system 53
Fax functions and operation 54
- Computer and network security features 54
- PSTN operation 54
- The fax subsystem 54
- Fax card in the fax subsystem 54
- Fax page storage in flash memory 56
2 Solve problems 57
Problem-solving checklist 58
- Problem-solving flowchart 59
- Step 1: Check that the printer power is on 60
- Step 2: Check the control panel for error messages 61
- Step 3: Test print functionality 62
- Step 4: Test copy functionality (MFP models only) 62
- Step 5: Test the fax sending functionality (fax models only) 62
- Step 6: Test the fax receiving functionality (fax models only) 62
- Step 7: Try sending a print job from a computer 63
- Step 8: Test the Plug and Print USB Drive printing functionality 63
- Factors that affect printer performance 63
Troubleshooting process 64
- Determine the problem source 64
- Power subsystem 66
Tools for troubleshooting 78
- Print the print status and printhead information pages 78
- Event log messages 81
- Individual component diagnostics 82
- Diagrams 87
- Print-quality troubleshooting tools 112
- Control-panel menus 120
- Control Panel Messages Document (CPMD) 65
Print quality troubleshooting guide 162
- How to search for printer documentation 162
- Printer pre-checks 165
- Printer specific image defects 178
Solve copy/scan problems (MFP models only) 219
- Solve copy problems (MFP models only) 219
- Solve scan problems (MFP models only) 222
Solve paper jam or feed problems 228
- Printer does not pick up paper or misfeeds 228
- Clear paper jams 230
Solve performance problems 254
- Factors affecting print performance 254
- The printer does not print or it prints slowly 255
- The printer prints slowly 256
Solve connectivity problems 257
- Solve USB connection problems 257
- Solve wired network problems 257
Service mode functions 259
- Print Quality Tools 259
- Maintenance 265
- System Diagnostics 269
- Report a Problem 279
- Print from USB 280
Firmware upgrades 281
- Determine the installed revision of firmware 281
- Perform a firmware upgrade 282
Fax problems 284
Appendix A Printer specifications 287
Printer dimensions and weight 288
Printer space requirements 288
Power consumption, electrical specifications, and acoustic emissions 288
Operating-environment range 288
Certificate of Volatility 289
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