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26. Upper thread guard sensor
Check
When the upper thread is finished or breaks the machine will stop.
This is done by means of a photo-diode (B) on the push button board
which reads the movement on the screen (C) which moves
simultaneously with the thread take-up spring (D).
The machine must be threaded in order to activate
the upper thread guard sensor.
Upper thread guard sensor check.
Get in to service program.
Select
Sensor -
in order to check
The function of the upper thread guard sensor is indicated by a square.
Check that the square alternates between filled and not filled when
moving the thread take-up spring.
Dismounting
1. Remove the thread tension cover by taking
a firm grip on the top of the cover (A)
and then carefully pulling it away from the front cover.
2. Remove the push button board by disconnecting
it from the cable .
NOTE !
The setting of the thread take-up spring affects the function of
the upper thread sensor.
Settings
