TM 55-1520-240-T PARAGRAPH   15-6 TABLE  OF  CONTENTS APU  MICROPROCESSOR  ELECTRONIC  SEQUENCE  UNIT  (ESU)  TROUBLESHOOTING PARAGRAPH DESCRIPTION FUNCTION PAGE PARAGRAPH DESCRIPTION FUNCTION PAGE 15-6 15-6.1 15-6.2 15-6.3 15-6.4 15-6.5 15-6.6 15-6.7 15-6.8 15-6.9 15-6.10 15-6.11 APU MICROPROCESSOR  ELECTRONIC  SEQUENCE UNIT  (ESU) ESU  COMPONENTS APU  SYSTEMS   BITE   INDICATION   FAILURE TABLE (FAILURE   TO   START) APU ESU ESU ESU ESU STARTING  SEQUENCE  FAILURE  AND P.C.  BOARDS  FAILURE  TABLES SYSTEM  SCHEMATIC SYSTEM   WIRING   DIAGRAM BLOCK   DIAGRAM INITIALIZING   BITE   LOGIC   BLOCK   DIAGRAM NORMAL   START   BITE   LOGIC   BLOCK   DIAGRAM MALFUNCTION   BITE   LOGIC   BLOCK   DIAGRAM (BEFORE START) MALFUNCTION   BITE   LOGIC   BLOCK   DIAGRAM (DURING STARTING AND RUNNING) APU  MOTORS  BUT  DOES  NOT  START,  ESU DRAWING TABLE TABLES DRAWING DRAWING DRAWING DRAWING DRAWING DRAWING DRAWING TASK 15-101 15-105 15-106 15-109 15-110 15-111 15-112 15-113 15-114 15-115 15-116 15-117 15-6.12 15-6.13 15-6.14 15-6.15 15-6.16 15-6.17 15-6.18 15-6.19 APU  MOTORS  BUT  DOES  NOT  START,  ESU APU  MOTORS  BUT  DOES  NOT  START,  ESU APU  STARTS  BUT  SHUTS  DOWN,  ESU  BITE APU  STARTS  BUT  SHUTS  DOWN,  ESU  BITE APU  STARTS  BUT  SHUTS  DOWN,  ESU  BITE APU  STARTS  AND  RUNS  THEN  SHUTS  DOWN, (OVERTEMPERATURE)   (HOT   START) APU  STARTS  BUT  SHUTS  DOWN,  ESU  BITE APU  STARTS  AND  RUNS  BUT  ESU  BITE PROBE)   (WARNING) TASK TASK TASK TASK TASK TASK TASK TASK 15-119 15-123 15-127 15-129 15-131 15-133 15-135 15-136 Change 8 15-103