g Inspect varistors

TM 5-6350-264-14&P-9 NAVELEX EE 181-AA-OMI-100/E121 DZ-204 T. O. 31S9-2FSS9-1-9 Turn the operating mode switch to ACCESS. (1) If the AA is silent, put on ear protection and open the AA door Pull the TAS plunger all the way out. Remove screws that secure faceplate, and remove faceplate Turn off power switch located in the upper left corner of the AA Tag, disconnect, and insulate speaker wire from TB3-7. (2) If the AA continues to sound, tag, disconnect, and insulate green wire (from status processor) from TB4-1 in the Control Unit Install a jumper between TB4-4 and TB4-1 AA should be silenced Put on ear protection and open AA door Pull the TAS plunger all the way out Remove screws that secure the faceplate, and remove the faceplate. Turn off power switch located in the upper left corner of the AA. Tag, disconnect, and insulate speaker wire from TB3-7 in the Control Unit, remove the AA interconnecting wire from TB4-3 and connect a jumper wire from TB4-4 and TB43 Turn on power switch in AA. The AA speaker is now disabled and maintenance and troubleshooting may be performed. (3) When maintenance or troubleshooting has been completed, turn off power switch in AA In the Control Unit, remove jumper wire from TB4-4 and TB4-3 Connect AA interconnecting wire to TB4-3 In the AA, connect speaker wire to TB3-7; turn on power switch Install and secure faceplate Close door on AA On Control Unit, turn operating mode switch to TEST/ RESET and then to SECURE. g Inspect varistors for evidence of physical damage or overheating Disconnect one lead from each varistor from TB1. Set multimeter to ohms and connect one lead to each varistor lead Meter should indicate over 100, 000 ohms. Check both varistors. h Refer to figure 5-1 for all test points found in troubleshooting table 5-1 Figure 5-2 is a wiring diagram of the Audible Alarm Step-by-step troubleshooting procedures, including Trouble, Probable Cause, and Corrective Action, are listed in table 5-1. 5-3