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
