Safety Test; Microswitch Functional Test - Pfaff Coverlock 4872 Service Manual

Safety test

31. Microswitch functional test

A functional test of the microswitch is always to be carried out after any repairs.
G Connect the foot control.
G Turn on the master switch.
G Open the looper cover or the swivel plate (fig. 68).
G The electricity supply to the machine is interrupted.
G Activate the foot control.
G The machine must not run during this test.
G Close the looper cover/swivel plate.
Note:
When the looper cover/swivel plate is open, the machine must not start to run.
G When the looper cover or the swivel plate has been closed and the machine does not start to run, the
contact pins must be checked.
G If necessary, the contact holder 42 can be pushed upward slightly until it functions perfectly (fig. 69).
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