HP LaserJet 4345mfp / 4345x mfp / 4345xs mfp / 4345xm mfp Service Manual

Comprehensive service and repair documentation for all HP LaserJet 4345 models, covering installation, maintenance, and troubleshooting. Includes detailed part diagrams. PN Q3942-90950

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Document Details

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Document Number / Seller:
25541 / Donna Cooper
File Size:
22.39 MB
File Type:
ZIP
Language:
English
Pages:
650
Printable:
Yes
Category:
Printer
Last updated / verified
Oct 11, 2025

Models Covered & Key Technical Specifications

HP LaserJet 4345mfp Series (Q3942-90950) - Service Manual This manual provides full service and repair documentation for all HP LaserJet 4345 models. | HP LaserJet Library Packet

  • Documented Specifications: Print speed of 45 ppm establishes the maximum throughput for Letter-size paper.
  • Calibrated Settings: For optimal operation, 600 dpi resolution is configured for enhanced detail.
  • Authorized Maintenance Procedures: After 215,000 pages, a maintenance kit replacement is documented.
  • Core Component Functionality: The fuser assembly uses heat and pressure to bond toner to media.
  • Rated Power Consumption: Ready mode consumes 44 W of power.
  • Principal System Operations: The formatter processes print jobs and controls device functions.

Professional Workshop Service Manual & Technical Specifications

HP LaserJet 4345 Series Service Manual: HP Printer Repair Manual

Model-Designation: HP LaserJet 4345mfp Series // Service-Level: Comprehensive Technical Documentation / Operation Logic // Unit-Designations: Printer, Copier, Scanner Assessment-Parameter Value Logic
Product Dimensions (W x D x H) 761 x 566 x 545 mm Standard operational configuration
Power Requirements 100-127 VAC, 50/60 Hz Standard North American operation
Print Speed 45 ppm (Letter) High-speed document processing
Duty Cycle Up to 200,000 pages/month Sustained high-volume usage
Memory 256 MB RAM Standard data processing capacity

Maintenance hierarchies are structured into the following key areas:

  • Section 1: Product Information - Details configurations, features, and site requirements.
  • Section 2: Service Approach - Outlines repair methodology and ordering processes.
  • Section 3: Installation and Configuration - Guides initial setup and network connectivity.
  • Section 4: Maintenance - Covers cleaning, calibration, and part replacement.
  • Section 5: Theory of Operation - Explains internal systems and component functions.
  • Section 6: Removal and Replacement - Provides step-by-step procedures for part servicing.

OEM guidelines are included for maintaining optimal performance and print quality. The manual details internal component functions, including the engine control system and image formation process. Torque specifications are documented for critical component reassembly to ensure proper rotational loosening prevention. Parts identification is covered for all user-replaceable components, aiding in efficient servicing.

FAQ

Specify the **applicable** lubrication requirements for rollers? keyboard_arrow_down

Lubrication is not specified for standard rollers in this manual; however, ensure rollers are clean and free from dust for optimal performance.

What is the **exact** print cartridge life expectancy? keyboard_arrow_down

The print cartridge life expectancy is an average of 18,000 pages at 5% coverage, though actual yield may vary based on usage conditions and print job complexity.

Calculate the **specific** diagnostic procedures for a missing sensor signal? keyboard_arrow_down

304 pages detail diagnostic procedures, including steps for sensor issues. Generally, if a sensor does not detect media within the expected time frame, a jam message appears, and the process stops. Refer to page 118 for specific jam detection sensors and procedures.

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Reviews (3)

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The manual covers everything you need to know about the HP LaserJet 4345, and the support team was quick to respond to my questions. Downloading was hassle-free, making this a great resource.
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The service manual for the HP LaserJet 4345 is incredibly detailed and easy to navigate. The download process was smooth, and I received the link via email almost immediately. Highly recommend!
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Rated 4 out of 5 stars