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REPAIR (cont) - TM-5-4210-220-12_586
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REPAIR (cont) - TM-5-4210-220-12_588
TM 5-4210-220-12 4-24.  ELECTRICAL SYSTEM - Continued (6) Open the inverter as detailed in a preceding, steps 5 thru 8. (7) Unplug PCB1 or PCB3 as required and replace. (8) Replace inverter as detailed in steps 13 and 14 of K2 Relay Repair preceding. d. Oscillator Circuit Board PCB2 Repair (1) Open the inverter as detailed in a preceding, steps 5 thru 8. (2) Set  battery  switch  to  ON,  and  ignition  switch OFF. (3) Locate the SCR gate leads, the small white leads  to  the  SCR's  which  have  a  plastic connector in the lead. (4) Tag    and    separate    the    leads    from    the plastic connector. (5) With  the  start  button  depressed,  read  the voltage between the oscillator case (ground)   and   the   part   of   the   gate   lead connected   to   the   oscillator   circuit   board PCB2. (6) Replace the oscillator board PCB2 if the voltage is not between 2 Vdc and 7 Vdc and the voltage is not equal on both leads from each SCR ( 0.3 Vdc) (7) Replace inverter as detailed in steps 13 and 14 of a preceding e. SCR Repair (1) Be   sure   all   commutation   fuses   are   not   blown. These four fuses are mounted on the front of the inverter. (2) Open the inverter as detailed in a preceding steps 5 thru 8. (3) Leave battery switch OFF. (4) Remove  SCR  cathode  (ground)  wires  from  their ground   connection.      These   are   red   #   8   wires which  are  attached  to  the  bottom  of  the  inverter with a nut and screw. (5) Connect  an  ohmmeter  with  positive  lead  (+)  on heat  sink  and  negative  lead  (-)  on  the  cathode removed from ground stud. 4-465

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