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COMPONENT TESTING
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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VOLTAGE REGULATOR TEST
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 ELECTRICAL Negative Heat Sink Tests: 1.    Connect  the  negative  test  lead  to  the  negative  heat  sink and  touch  the  positive  test  lead  to  each  diode  terminal.    If  a low  resistance  reading  is  obtained  or  if  the  test  lamp  lights, the diode is shorted (see Fig.  15). 2.    Reverse  the  test  leads  so  that  the  positive  test  lead  is connected to the negative heat sink.  Touch the negative lead to each of the three diode terminals.  A low resistance reading should be obtained, and if a test light is being used, the lamp should light.  If high resistance is indicated or the lamp does not light, the diode is open (see Fig. 16). If a shorted or open diode is detected in the preceding tests, the entire heat sink assembly should be replaced. Heat    sinks    supplied    as    service    replacements    may    differ slightly  in  thickness  or  general  appearance  from  the  original parts.  This will in   no   way   impair   their   interchangeability   or   reliability.      To obtain the maximum serviceability, several different assemblies  may  be  used  as  replacements.    These  will  be listed in the appropriate parts list. DIODE TRIO TESTS The diode trio may be tested with the same equipment which was used to check the diodes in the heat sink assemblies. 1.  Connect the negative lead of the tester to the output lead of the diode trio, and touch the positive tester lead to each of the   three   copper   terminal   pads   (see   Fig.      17).      A   low resistance  should  be  indicated,  and  if  a  test  lamp  is  being used, it should light. 2.    Connect  the  positive  terminal  of  the  tester  to  the  output lead  of  the  diode  trio  and  touch  the  negative  lead  to  each  of the three copper terminal pads.  A high resistance should be indicated and if a test lamp is being used, it should not light. Discard any diode trio which does not pass all of these tests. CAPACITOR TEST The capacitor connected across the heat sinks may be tested on a capacitor tester if available. PRINTED IN UNITED STATES OF AMERICA FIG.  13 FIG.  14 FIG.  15 FIG.  16 FIG.  17 CTS-2743T  Page 8

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