Adjusting The Needle Thread Breakage Detection Circuit Board; Measurement Of Sensor Output; Relation Between Shielding And Sensor Output - ELNA E9020 Service Manual

(31) Adjusting the needle thread breakage detection circuit board

(31) -1 Measurement of sensor output

Measure the voltage between ground and CN16-3 pin.

(31) -2 Relation between shielding and sensor output

Shielding plate OPEN → 4.5 to 5.2 V
Shielding plate CLOSE → 0 to 0.5 V
Loosen 1 and adjust 2 so that CLOSE is set when the jig of 0.2 mm is put between the thread breakage
shielding plate and the thread take-up spring cushion, and OPEN is set when the jig of 0.4 mm is put between
them.
After the completion of adjustment, apply the screw lock to 1 and 2.
How to adjust
How to adjust
Adjustment drawing
CN16-3 (+)
Ground
Tester
Adjustment drawing
0.2 0.4
2
CLOSE OPEN
1
39