Reece 32

A23

1. CLAMP CIRCUIT TROUBLESHOOTING CHART

SYMPTOM

MACHINE CONDITIONS

TEST-REMEDY

~ Check with voltmeter on the 50 volt de scale. Connect negatiye probe to ground

Clamp will not raise.

MAIN SWITCH Pu II to Start - SELECTOR -- P&E

--

LOADING

MAN BACK

or 142 and the positive probe to 4Y. If a 24 volt de reading is obtained, the Fingers Down Safety switch is good. If not, replace switch.

"·

@ Connect negative probe to ground or 142 and positive probe to 1Y. If 24 volts de is.obtained, the Clutch Dog switch is good. If not, replace switch. @ With the voltmeter on the 50 volt de scale, connect the negative probe to 142 and the positive probe to 122. If a 24 volt de reading is obtained, this will indi· cate that the LOADING switch, the CLAMP SAFETY switch, and the Clamp switch (pedal l are good. If no

Same as above

Same as above

Same as above

Same as above, also:

Close Clamp switch ( pedal l

voltage Is indicated make a continuity check through each switch and replace the faulty one.

@ Set the voltmeter to the 150 volt ac scale, and check the voltage between

Same as above·

Same as above

16Y and TP27. It should read 115 volts, ac. If it does, it indicates that the com- ponents on the circuit board are good. Perform next step.

@J Set the meter to the X10 ohms scale, and check between 16Y and TP27. The reading should be approximately 80 ohms. If it is not, replace the clamp solenoid. ® Set voltmeter to the 50 volt de scale. Connect the negative probe to ground or 142, and the positive probe to SY. If voltage is present trouble is in one or both of the UNLOADING circuit boards or the automatic clamp-up cir· cuit. Replace faulty board. @ Set voltmeter to the 50 volt de scale. Connect the negative probe to ground

Same as above

MAIN SWITCH _Push to Stop

Clamp goes up at

MAIN SWITCH _Pull to Start

wrong time.

CLAMP TABLE _Back SELECTOR __ELEC

Clamp tends to jump

MAIN SWITCH _?ull to Start CLAMP TABLE ---Forward

up before fingers

rise.

FINGERS

or 142 and the positive probe to 5Y. If no voltage reading is obtained, the Auto Clamp Up relay (RL7) and the Fingers Down switch are good. If 24 volts de is present, the circuit board or the Fingers Down switch is bad. Make a continuity check through the switch and, if bad, replace. If the switch is good, replace the cir;cuit board.

SEMI*

·sELECTOR _p & E

MAN FRONT

LOADING

•Do not allow fingers to raise and acti~ate the auto clamp

up circuit.

From the Library of Superior Sewing Machine & Supply LLC