TM 1–1520–238–T–2
Change 1
2–1
CHAPTER 2
MASTER FAILURE SYMPTOM INDEX
INTRODUCTION
Chapter 2 contains failure symptoms and references for troubleshooting all systems for the following:
Power is not available to the equipment.
Circuit breakers do not stay closed.
Panel edge-light failure.
Caution and warning indicators lighting.
Maintenance FD/LS NO-GO messages.
Missing or improper display symbology.
Audio/visual faults.
Table 2–1.
Master Failure Symptom Index
Failure Symptom
Reference
MOC
1000 HZ TONE IS NOT HEARD (ADF CONTROL
PANEL: MODE CONTROL SET TO ANT,
MAN/2128/500 CONTROL SET TO MAN,
FREQUENCY CONTROLS SET TO DESIRED
STATION, TEST/TONE SWITCH SET TO
CENTER AND VOL CONTROL SET AS
DESIRED)
TM 11–1520–238–23–2
AUTOMATIC
DIRECTION FINDER
(ADF) AN/ARN–149
115 VAC IS NOT PRESENT FROM AC ELEC
UTIL PWR CIRCUIT BREAKER (CB6)
(EXTERNAL ELECTRICAL POWER APPLIED)
TM 1–1520–238–T–6
EXTERNAL POWER
AND GROUND
SERVICE UTILITY
RECEPTACLE
0200 CANNOT BE ENTERED INTO RC/MC
(RUN/LOAD SWITCH HELD TO LOAD)
TM 9–1090–208–23–2
AREA WEAPON
SYSTEM
12D IS NOT DISPLAYED ON THE CENTER
DISPLAY (CPG DPLR NAV PANEL: DISPLAY
SWITCH SET TO DEST/TGT, DEST DISP
THUMBWHEEL SET TO P AND KEYBOARD
KEYS ACTIONED)
TM 11–1520–238–23–2
DOPPLER
NAVIGATION
SYSTEM (DNS)
AN/ASN–128
12L IS NOT DISPLAYED ON CENTER DISPLAY
(CPG DPLR NAV PANEL: DISPLAY SWITCH
SET TO DEST/TGT, DEST DISP
THUMBWHEEL SET TO P AND KEYBOARD
KEYS ACTIONED)
TM 11–1520–238–23–2
DOPPLER
NAVIGATION
SYSTEM (DNS)
AN/ASN–128
2 OR MORE PYLONS DO NOT MOVE (PYLON
ACTG SWITCH SET TO UP AND THEN
DOWN)
TM 1–1520–238–T–8
EXTERNAL STORES
ELEVATION
CONTROL
