Table   4–2.   TROUBLESHOOTING   – Continued MALFUNCTION TEST    OR    INSPECTION CORRECTIVE    ACTION 2.   NO   OUTPUT   VOLTAGE   SHOWN   BY VOLTMETER—Continued c. Position the circuit breaker to the ON position. d.  With  a  multimeter,  measure  the  output voltage  across  load  terminals  to  verify  the voltage on the set voltmeter. Voltage should not vary more than 4 volts. If  voltage  variation  exceeds  5%,  replace  the voltmeter  (AC  Unit)  (para  4-25).  If  voltage variation  exceeds  4  volts,  then  replace  the voltmeter  (DC  Unit)  (para  4-26). Step 2. Inspect  the  voltage  changeover  toggle  switch (AC  Unit)  for  proper  operation,  signs  of  burn- ing, loose wire contacts, stripped threads, and other damage. Test the voltage changeover toggle  switch  as  follows: a.  With  the  power  off,  disconnect  the  volt- age  changeover  switch. b. Position switch on 120 V setting and check  continuity  between  the  center  terminal and the 120 V terminal. c. Position switch on 240 V setting and check  continuity  between  the  center  terminal and the 240 V terminal. If a malfunction is indicated on either posi– tion,  replace  the  switch  (para  4-25). Step 3. Inspect  the  terminal  boards  for  cracks  or burned areas. Replace   defective   terminal   boards   (paras   4- 25  and  4-26). Step 4. Inspect  the  load  switch  (AC  Unit),  for  proper operation,  signs of  burning,  loose  wire  con- tacts,  stripped  threads,  or  other  damage.  Test the load switch as follows: a.   Stop   generator   set   and   disconnect   termi- nals  to  load  switch. b.   With   a   multimeter,   check   the   continuity of  the  load  switch.  OFF  position  will  indicate an  open  circuit;  ON  position  will  indicate  a short   circuit. TM     5-6115-323-14 TO    35C2-3-385-l Table   4-2.   TROUBLESHOOTING   - Continued MALFUNCTION TEST    OR    INSPECTION CORRECTIVE    ACTION 2.   NO   OUTPUT   VOLTAGE   SHOWN   BY VOLTMETER—Continued If   the   above   readings   are   not   obtained,   re- place   the   load   switch   (para   4-25). Step 5. Manually  flash  the  fields  as  follows: a.   Connect   two   1.5   volt   flashlight   batteries in  series  and  connect  a  wire  to  each  end. b.  Connect  the  positive  wire  from  the batteries  to  terminal  No.  5  on  the  voltage regulator. c.   Start   the   generator   set. d.   Momentarily   touch   the   negative   wire   to terminal  No.  6  on  the  voltage  regulator  to flash  the  field. If   the   field   cannot   be   flashed,   refer   to   inter- mediate   (field),   (direct   support   and   general support)   maintenance   personnel. Step  6  Inspect  the  shunt  (DC  Unit)  for  burnt  areas and other damage. Replace   a   defective   shunt   (para   4-26). 3.   OUTPUT   VOLTAGE   SHOWN   ON   VOLT- METER   AS   HIGH   OR   LOW Step 1. Step 2. Inspect the voltmeter for signs of burning, broken  or  cracked  glass,  water  or  other  dam- age. Test the voltmeter. (See Malfunction 2, Step 1.) Replace   a   defective   voltmeter   (paras   4-25 and   4-26). Inspect the ground strap for burned areas, frayed  spots,  broken  strands,  loose  connectors, and other damage. Replace   a   defective   ground   strap   (para   4-19). 4.   FREQUENCY   NOT   SHOWN   ON   FRE- QUENCY   METER   OR   CANNOT   BE   STA- BILIZED   AT   60   HZ   (AC   Unit). Inspect  the  frequency  meter  for  signs  of  burning  bro- ken or cracked glass, water or other damage. Replace   a   defective   frequency   meter   (para   4-25). S e c t i o n    V I .    R A D I O    I N T E R F E R E N C E    S U P P R E S S I O N 4-13.   General   Methods   Used   to   Attain   Proper 4-14.   Interference   Suppression   Components Suppression The   generator   set   is   not   provided   with   any   primary Essentially,   suppression   is   attained   by   providing   a radio   interference   components   that   are   the   responsibility low-resistance   path   to   ground   for   stray   currents.   The of   organizational   maintenance.   For   information   covering methods    used    include    shielding    the    ignition    and    high secondary   radio   interference   components   on   the   engine, frequency   wires,   grounding   the   frame   with   bonding refer   to   the   appropriate   engine   manual   in   Appendix   A. straps,    and    using    capacitors    and    resistors.    For    general information   on   radio   interference   suppression,   see Appendix    A    for    the    appropriate    service    manual. 4–13