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Page Title: Table 4-36. Troubleshooting Digital Display Board (A12) Units, Tens, Hundreds, Thousands, Update, Inhibit Circuits.
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TM 55-4920-412-13&P r. Digital Display Board (A12). (1) Set  Power  Switch  to  ON  and  set  controls on unit tester as follows: (a) Inter Cal Select Switch to 21. (b) Display Update Switch ON. (c) Analog   Set   Switch   to   STOP   then SLOW, then FAST. (2) Set  Power  Switch  to  OFF.    Inter  Monitor will count up displaying 1827 and then reset.  If not, see troubleshooting Table 4-36. NOTE Isolation  of  defective  monitor  boards NO  1  (A7)  and  NO.  2  (A8)  requires  a known   good   signal   data   converter (SDC).  If monitor boards do not pass performance tests, substitute a known  good  SDC.    If  they  still  do  not pass   send   the   VIDS   test   set,   along with the known good SDC, to the area TMDE support team (ATST). Table 4-36.  Troubleshooting Digital Display Board (A12) Units, Tens, Hundreds, Thousands, Update, Inhibit Circuits. NOTE Use extender board as applicable when troubleshooting circuits. Trouble Probable Cause Remedy Analog Monitor does not count up Digital Display Board (A12).  Regula- Replace defective components or re- displaying units digits 0 thru 9 and tor Board (A4).  B C D Counter place boards.  See figs. 4-14, 4-18, reset. Boards (AS).  Analog Processor (A9), 4-19, 4-21, 4-22, FO-6, FO-8, FO-11, (A10).  OSC Board (A6) (Reset FO-12, FO-13, FO-14. Pulses). Analog Monitor does not count up Digital Display Board (A12).  Regula- Replace defective components or re- displaying tens digits 0 thru 9 and tor Board (A4).  B C D Counter place boards.  See figs. 4-14, 4-18, reset. Boards (A5).  Analog Processor (A9), 4-19, 4-21, 4-22, FO-6, FO-8, FO-11, (A10).  OSC Board (A6) (Reset FO-12, FO-13, FO-14. Pulses). Analog Monitor does not count up Digital Display Board (A12).  Regula- Replace defective components or re- displaying hundreds and reset. tor Board (A4).  B C D Counter place boards.  See figs. 4-14, 4-18, Boards (AS).  Analog Processor (A9), 4-19, 4-21, 4-22, FO-6, FO-8, FO-11, (A10).  OSC Board (A6) (Reset FO-12, FO-13, FO-14. Pulses). Analog Monitor does not count up Digital Display Board (A12).  Regula- Replace defective components or re- displaying thousands and reset. tor Board (A4).  B C D Counter place boards.  See figs. 4-14, 4-18, Boards (AS).  Analog Processor (A9), 4-19, 4-21, 4-22, FO-6, FO-8, FO-11, (A10).  OSC Board (A6) (Reset FO-12, FO-13, FO-14. Pulses). Update Rate Control Input 5 Vp-p OSC Board (A6). Replace defective components or missing from pin 2. board (A6).  See figs. 4-16, FO-4, FO-10. 5 vdc low or missing Logic Power Supply (A3).  Input 8v Replace defective components or missing to Regulator Board (A4) or replace boards (A3), (A4).  See figs. output 5v missing. 4-13, 4-14, FO-6, FO-7, FO-8. 4-66  Change 2

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