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.
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