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Page Title: REPLACEMENT OF R1 RESISTOR. Continued
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TM 11-5820-890-30-5 15-24. REPLACEMENT OF R1 RESISTOR.  Continued ITEM ACTION REMARKS INSTALLATION f.  R1  resistor  (1) g.   Two   screws,   flat   washers, and  Iockwashers  (2) h.  R1  resistor  (1)  wires i. Mounting  plate assembly  (2) Obtain  replacement  R1  resistor. Use  cross  tip  screwdriver.  Install  two retained  screws,  flat  washers,  and Iockwashers  securing  R1  resistor  (1) to  chassis. Use  long  nose  pliers  and  soldering  equip- ment.  Attach  and  solder  each  tagged wire  to  correct  lead  of  resistor,  and remove  wire  tags. Install  retained  mounting  plate  assembly on  battery  tray  subassembly  (1). These  were  removed  in step  d. Before  and  after  soldering, clean  wires  and  leads  with alcohol  and  cotton  swabs, Refer  to  paragraph  15-20 for  installation  of  mounting plate  assembly. 15-25. Tools: REPLACEMENT OF VR1 ZENER DIODE. Cross  tip  screwdriver Soldering  kit Long  nose  pliers Soldering  aid Expendable  Supplies: Solder Alcohol References: 7/16  inch  open-end  wrench Heat sink Cotton  swabs Paragraph  15-20  for  removal  and  installation  of  mounting  plate  assembly. ITEM ACTION REMARKS REMOVAL a.  Mounting  plate Remove  and  retain. Refer  to  paragraph  15-20 assembly  (2) for  removal  of  mounting plate  assembly. b.  Battery  tray Set  upside  down  on  work  surface  with subassembly  (1) left  side  toward  you. c.  VR1  zener  diode  (3) Use  long  nose  pliers  and  soldering  equip- ment.  Desolder  wire  from  terminal  on wire zener  diode.  See  figures  15-5  and  15-6. d.   Hex and e.  VR1 nut,  flat  washer, Use  7/1  6  inch  open-end  wrench.  Remove Iockwasher  (4) and  inspect  hex  nut,  flat  washer,  and Iockwasher  securing  VR1  zener  diode  to chassis.   If   damaged,   obtain   replacement. zener  diode  (3) Remove  and  discard. 15-27


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