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Chapter 7 Maintenance
BES-941BC • BES-1241BC
145
7. Turn on the power of the sewing machine and measure the out-of-step limit of the lower shaft
module in the test mode.
8. Replace the lower shaft module if it cannot be repaired even if being checked in the test
mode.
9. Install the lower shaft's case cover and secure it with polyester tape.
* Use heatproof tape to secure it if polyester tape is not available.
10. Reassemble the module by reversing this procedure.
11. Carry out the thread trimming test for checking.