Reece 32

9. TAB KN.IFE

CIRCUIT TROUBLESHOOTING CHART

MACHINE CONDITIONS

SYMPTOM

TEST-REMEDY

@) Set voltmeter to the 50 volt de scale. ~onnect the negative probe to ground

Knife fingers will

MAIN SWITCH_ Pull to Start

not raise in

SELECTOR

P&E

FINGERS UP.

CLAMP TABLE __ Forward

or 142 and the positive probe to 11Z. If a 24 volt de reading is obtained, the FINGERS switch is good in the UP position. If not, replace switch.

position.

UP

FINGERS

® Set voltmeter to the 150 volt ac scale. Connect the probes to 16Y and TP30. If a reading of 115 volts ac is obtained, the circuit board components are good. If not, replace circuit board. @ Set the meter to the X10 ohms scale. Connect the probes to 14Y and TP30. If a reading of approximately 8() ohms is obtained, the fingers solenoid is good. If not, replace solenoid. ® Set voltmeter to the ~O volt de scale. Connect the negative probe to ground or 142 and the positive probe to SY. If a reading of 24 volts de is obtained, the FINGERS switch is good in the SEMI position, and the knife switch ( Knee ) contacts are good. If no reading 1s obtained, check each switch and re- place the faulty one. Connect the negative probe to ground or 142 and the positive probe to 112. If a 24 volt de reading is obtained, the Thread Monitor switches are good. If not, replace faulty switch. ® Set voltmeter to the 50 volt de scale.

Same as above

Same as above

Same as above

MAfN SWITCH __ Push to Stop

Knife Fingers will

MAIN SWITCH __ Pull _to Start

not rise in

SELECTOR

P&E

FINGERS SEMI

CLAMP TABLE __ Forward

position.

SEMI

·FINGERS

Press Knee control

Same as above

Same as above, also:

Close thread monitor switches

@ ,@ and [ 9C]

Repeat steps

® Set voltmeter to the 50 volt de scale. Connect the negative probe to ground

Kn.if e fingers will not rise automati- cally in FINGERS

MAIN SWITCH_ Pull to Start

P&E AUTO

SELECTOR

or 142 and the positive probe to 172. If a reading of 24 volts de is .obtained, the FINGERS switch is good in the AUTO position.

FINGERS

AUTO position.

From the Library of Superior Sewing Machine & Supply LLC