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Page Title: Table 4-24. Troubleshooting Regulator Board (A4)
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TM 55-4920-412-13&P NOTE Perform logic P/S checks in Paragraph  c  before  Troubleshooting Regulator Board (A4). e. Regulator Board A4. (1) Connect     test     equipment     as shown     in Figure  4-1  with  unit  tester  connected  and  Set  ON-OFF- SIM ONLY to OFF. (2) Connect  digital  multimeter  leads  between J6 pin 26 and COM. (3) Set ON-OFF-SIM ONLY to ON. (4) Digital    multimeter    will    indicate    between +9.5 and +10.5 vdc.  If not, see Troubleshooting Table 4- 24. (5) Set ON-OFF-SIM ONLY to OFF. (6) Disconnect  digital  multimeter  lead  from  J6 pin 26 and reconnect J6 pin 27. (7) Set ON-OFF-SIM ONLY to ON. (8) Digital    multimeter    will    indicate    between -9.5   and   -10.5   vdc.      If   not,   see   Troubleshooting   Table 4-24. (9) Set ON-OFF-SIM ONLY to OFF. (10) Disconnect  digital  multimeter  lead  from  J6 pin 27 and reconnect to J9 pin 37.  Observe that CLOCK INHIBIT is set to ANA position. (11) Set   ON-OFF-SIM   ONLY   to   ON.      Digital multimeter  will  indicate  between  +4.5  and  +5.5  vdc.    If not, see Troubleshooting Table 4-24. (12) Set    CLOCK    INHIBIT    to    DIG    position. Digital   multimeter   will   indicate   between   -0.5   and   +0.5 vdc. (13) Set ON-OFF-SIM ONLY to OFF. NOTE CDU   and   SDC   when   tested   provide voltage  inputs  to  unit  tester  for  light circuits   listed   below.      Troubleshoot as applicable. Table 4-24.  Troubleshooting Regulator Board (A4) NOTE Before  performing  troubleshooting,  remove  regulator  board  (A4)  and  reconnect using extender board. Trouble Probable Cause Remedy +10 vdc output low or missing Logic Power Supply Board (A3). Replace defective components or Regulator board (A4). boards.  See  figs. 4-13, 4-14, FO-7, FO-8. -10 vdc output low or missing Logic Power Supply Board (A3). Replace defective components or Regulator board (A4). boards.  See  figs. 4-13, 4-14, FO-7, FO-8. 5 vdc output low or missing Logic Power Supply Board (A3). Replace defective components or Regulator board (A4). boards.  See  figs. 4-13, 4-14, FO-7, FO-8. +15.5 vdc output low or missing Logic Power Supply Board (A3).   Replace defective components or boards.  See  figs. 4-13, FO-7. ± 15.5 vdc output low or missing Logic Power Supply Board (A3).   Replace defective components or boards.  See  figs. 4-13, FO-7. 8 vdc output low or missing Logic Power Supply Board (A3).   Replace defective components or boards.  See  figs. 4-13, FO-7. Change  2  4-49

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