This document is about the Lenovo laser printer maintenance manual, which introduces the specifications, operating principles, disassembly and reinstallation, adjustment and update after parts replacement, error indications and troubleshooting of the M7020/7030/7120/7130N and M3020/3120/3220 models of printers.
The manual is intended for service technicians and covers all aspects of repairing the listed Lenovo laser printers. It includes part identification, specifications, operating principles, data transfer procedures, disassembly/reassembly steps, lubrication points, and post‑repair adjustments.
Chapters detail service mode operations, error code explanations, and comprehensive troubleshooting. Appendices provide part numbering, firmware installation, custom code settings, and firmware switch configuration. This manual is written in Chinese.
| Memory capacity | 16 MB |
|---|---|
| Paper tray capacity | 250 sheets |
| Power input | 220‑240V AC, 50/60 Hz |
| Dimensions (W × D × H) | 432 mm × 395 mm × 294 mm |
| Weight (without toner) | 20.7 lb (9.4 kg) |
| Operating noise | ≤ 53 dB |
Press the designated key sequence described in Chapter 8 to access the service mode.
The manual lists the tightening torque for each screw in the disassembly/reassembly section.
Use the EEPROM parameter initialization function (code 01/91) in service mode.