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Page Title: Table 4-4. Troubleshooting Chart - Continued
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TM  55-4920-383-13&P Table   4-4.   Troubleshooting   Chart   -   Continued Malfunction Capacitance   measure- ments   incorrect. 4.  LOW  ADJ  control  (2) cannot be adjusted to  obtain  digital  dis- play  (7)  reading  of LOW on value stamped on  CAPACITANCE STANDARDS placard (5). 5.  HIGH  ADJ  control  (3) cannot be adjusted to obtain  digital  display (7) reading of HIGH value  stamped  on CAPACITANCE STANDARDS  placard  (5). Probable   cause CAPACITANCE   FUNCTION switch  A2S1,  CAPACITANCE RANGE  switch  A2S2,  inte- grated   circuits   A2Z8 through  A2Z10  or  transis- tors Q5 through Q10 and associated   circuitry. a.    LOW  ADJUST  potentiom- eter  R1  open  or  shorted. . b.  Capacitor  A2C70  open  or shorted,  or  relay  A2K1 inoperative. a.  HIGH  ADJUST  potentiom- eter  R2  open  or  shorted. b.  Capacitor  A2C69  open  or shorted,  or  relay  A2K2  in- operative. Corrective   action Check  and  replace  analog board  A2  as  required. a.  Using   multimeter, check  and  replace R1  as  required. b.  Check   and   replace analog  board  A2  as required. a.  Using  multi  meter, check  and  replace R2  as  required. b.  Check  and  replace analog  board  A2  as required. 4-17

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