HP DeskJet 4155e Wireless All-in-One Printer with Mobile Printing and 4800 x 1200 dpi Color Resolution MECH-07 Error Fix: Carriage Belt Worn or Loose

Error code MECH-07 on the HP DeskJet 4155e Wireless All-in-One Printer with Mobile Printing and 4800 x 1200 dpi Color Resolution means: Carriage Belt Worn or Loose. A grinding noise is heard during printing, the carriage moves erratically, or print output is garbled/misaligned — the carriage belt (a thin rubber belt that drives the printhead carriage back and forth across the page) has stretched, worn, or slipped off its motor pulley; the belt connects the carriage to a small DC motor; if the belt is stretched, the carriage cannot position accurately; belt replacement requires disassembly of the printer and is not a user-serviceable repair on most consumer models

The most successful fix is "Replace Printhead Assembly" (medium difficulty, ~30 minutes). Estimated DIY cost: $120-$160. HomeMD has 2 community-ranked fixes for this error.

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Yes — the top-ranked community fix ("Replace Printhead Assembly") is rated medium difficulty and takes about 30 minutes. Tools needed: Phillips screwdriver #1.

DIY cost: $120-$160. Professional repair typically costs $200-$280. Many homeowners save money by trying the top-ranked community fix first.

The HP DeskJet 4155e Wireless All-in-One Printer with Mobile Printing and 4800 x 1200 dpi Color Resolution has 8 other known error codes, including: E0 (Cartridge Access Door Open), E1 (No Paper in Input Tray), E2 (Paper Size Mismatch), E3 (Carriage Jam), E4 (Paper Jam), and 3 more.

Error code MECH-07 also appears on 6 other HP models: ENVY 6055e All-in-One Wireless Printer with Auto 2-Sided Printing and Smart App Integration, HP Color LaserJet Pro M255dw Wireless Color Laser Printer with Auto Duplex Printing and 22 ppm, HP OfficeJet Pro 9015e All-in-One Wireless Inkjet Printer with Auto 2-Sided Printing, 35-Page ADF, Fax, and 22 ppm, HP Smart Tank 7001 All-in-One Wireless Ink Tank Printer with Auto Duplex, ADF, and Refillable Ink System, LaserJet Pro M404dn Mono Laser Printer with 40 ppm, Ethernet, and Duplex Printing, OfficeJet Pro 8025e Wireless All-in-One Printer with 20 ppm, Smart Tasks, and Mobile Fax. The fix may vary by model, so check each model's specific page for tailored repair steps.