TM 1–1520–238–T–2Change 12–3Table 2–1.Master Failure Symptom Index (cont)Failure SymptomReferenceMOCACCEPT INDICATOR ON AN/APM–378TRANSPONDER TEST SET DOES NOT LIGHT(PILOT IFF TRANSPONDER CONTROLPANEL: MODE 4 TEST SWITCH SET TO ON)TM 11–1520–238–23–2IFF SYSTEMACCEPT INDICATOR ON AN/APM–378TRANSPONDER TEST SET DOES NOT LIGHT(PILOT IFF TRANSPONDER CONTROLPANEL: RAD TEST SWITCH SET TO RADTEST)TM 11–1520–238–23–2IFF SYSTEMACCEPT INDICATOR ON AN/APM–378TRANSPONDER TEST SET DOES NOT LIGHT(PILOT IFF TRANSPONDER CONTROLPANEL: MODE 4 SWITCH SET TO B)(AN/APM–424 TRANSPONDER TEST SET:TEST SEQ SWITCH PRESSED ANDRELEASED)TM 11–1520–238–23–2IFF SYSTEMADF AUDIO CANNOT BE ADJUSTED USINGVOL CONTROL (ADF CONTROL PANEL:MODE CONTROL SET TO ANT, MAN/2128/500CONTROL SET TO MAN, FREQUENCYCONTROLS SET TO DESIRED STATION,TEST/TONE SWITCH SET TO CENTER ANDVOL CONTROL SET AS DESIRED)TM 11–1520–238–23–2AUTOMATICDIRECTION FINDER(ADF) AN/ARN–149ADF AUDIO IN PILOT AND CPG HEADSET ISNOT PRESENT (ADF CONTROL PANEL:MODE CONTROL SET TO ANT, MAN/2128/500CONTROL SET TO MAN, FREQUENCYCONTROLS SET TO DESIRED STATION,TEST/TONE SWITCH SET TO CENTER ANDVOL CONTROL SET AS DESIRED)TM 11–1520–238–23–2AUTOMATICDIRECTION FINDER(ADF) AN/ARN–149ADF CONTROL PANEL EDGE–LIGHT DOESNOT LIGHT (PILOT EXT LT/INTR LT PANEL:R/CTR CSL CONTROL SET TO BRT)TM 11–1520–238–23–2AUTOMATICDIRECTION FINDER(ADF) AN/ARN–149ADF RCVR CONTROL PANEL EDGE LIGHTDOES NOT LIGHT (PILOT EXT LT/INTR LTPANEL: R/CTR CSL CONTROL ROTATED TOBRT) TM 11–1520–238–23–2AUTOMATICDIRECTION FINDER(ADF) AN/ARN–89
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