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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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STATOR TEST
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 ELECTRICAL Its value is .5 MFD, and 200 working volts D.C. In the absence of a capacitor tester, the unit may be checked for  shorts  by  means  of  an  ohmmeter  connected  across  the terminals.    A  low  resistance  reading  indicates  a  shorted  or leaking capacitor which should be replaced (see Fig. 18). VOLTAGE REGULATOR TEST The  regulator  circuitry  contains  devices  connected  in  such  a manner    that    parallel    or    "sneak"    circuits    exist    making    it impossible  to  electrically  test  each  individual  component,  as several will be in the circuit at the same time.  For this reason, point  to  point  resistance  checks  with  an  ohmmeter  may  be inconclusive   or   misleading.      The   regulator   can   be   most accurately tested by installing it in an alternator known to be serviceable. The   voltage   regulator   assembly   consists   of   a   number   of individual  components  such  as  capacitors,  resistors,  diodes and transistors, mounted upon and electrically connected by a printed    circuit    panel.        Because    these    components    are permanently  fastened  to  the  panel,  their  replacement  is  not recommended.  When it has been determined that a voltage regulator is unserviceable, it should be  discarded  and  a  new  assembly  installed  in  its  place  (see Fig.  19). ROTOR TEST The   rotor   should   be   checked   for   grounds   and   proper   coil resistance with an ohmmeter. 1.  With the ohmmeter connected between the rotor shaft and either slip ring, no reading (infinity) should be obtained.  If an ohmmeter reading other than infinity is obtained, the rotor coil is grounded and the rotor must be replaced (see Fig.  20). 2.    Check  rotor  coil  resistance  by  connecting  the  ohmmeter across the two slip rings (see Fig.  21).  The resistance of the rotor should be within the following limits: 2310JB 4.9-5.5 Ohms 2510JB 2.3-2.7 Ohms 2610JB 2.3-2.7 Ohms 2810JB 1.9-2.3 Ohms Discard rotors whose resistance values differ PRINTED IN UNITED STATES OF AMERICA FIG.  18 FIG.  20 FIG.  21 CTS-2743T  Page 9

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