TM 1–1520–238–T–3
Change 5
19–1
CHAPTER 19
GENERATOR MULTIPLEX READ CODES
FAILURE SYMPTOM INDEX
Symptom
Refer to paragraph
GEN 1 INDICATOR IS LIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19–1
GEN 2 INDICATOR IS LIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19–3
Personnel Required:
(2)
References:
TM 1–1520–238–T–6
Equipment Conditions:
Ref
Condition
TM 1–1520–238–T–6
AC ELECTRICAL POWER
GENERATION –
MAINTENANCE
OPERATIONAL CHECK in
progress
NOTE
All multiplex read code responses are read from right to
left.
Multiplex read codes must be used in conjunction with
applicable Maintenance Operational Check (MOC) in
progress.
Multiplex read codes are observed on the HOD (ADC) or
CDU (ADD).
MULTIPLEX READ CODE INTERPRETATIONS
19–1 SIGNAL NAME:
GEN 1 STATUS
MEMORY LOCATION: 001532
MEMORY DATA BIT(S):
14
(BINARY)
CONDITION:
Valid only during generator test.
SIGNAL FUNCTION:
Monitors field excitation.
REMARKS: From generator 1 through power distribution box to right–hand (RH) forward avionics bay
(FAB) multiplex remote terminal unit (MRTU) Type I.
PASS:
If second digit displayed on heads out display (HOD) is 4, 5, 6, or 7, go to paragraph 19–2.
FAIL: Location of fault: generator 1, wiring from generator to RH FAB MRTU Type I, RH FAB MRTU
Type I. Troubleshoot wiring to isolate fault (TM 1–1520–238–T–6).
