Maintenance & Repair Videos
Factory technician repair tutorials covering mechanical maintenance, sensor replacement, and knife calibration.
18:10
Rotary Hook Replacement & Timing Synchronization
How to install a new Japanese Koban rotary hook, remove hook burrs, and set 0.05mm clearance gap.
22:30
Needle Bar Reciprocator & Cam Replacement
Disassembling the needle case head, replacing worn reciprocating blocks, and applying synthetic lithium grease.
12:45
Trimmer Solenoid & Moving Knife Adjustment
Fixing short thread tails, clearing jammed threads under the needle plate, and adjusting stationary knife sharpness.
15:20
Dahao Motherboard Diagnostic & Sensor Rail Testing
Testing optical encoder sensors, checking DC power rail voltages, and troubleshooting Err-08 needle limit switches.