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1–10 CONDITION | Up
TM-1-1520-238-T-3 Army Model AH-64 Helicopter (NSN
1520-01-106-9519) (EIC: RHA) Multiplex Read Codes Manual | Next
Figure 1–2. CPG Data Entry Keyboard (ADC) and CDU (ADD) |
TM 1–1520–238–T–3
1–8
1–12
REMARKS.
REMARKS provide signal path information which is useful in determining possible fault locations during
troubleshooting.
EXAMPLE:
REMARKS: From DEK through CPG MRTU Type III to FCC. Selects operating mode for
fire control system.
1–13
PASS.
PASS provides fault isolation and troubleshooting actions to be performed, references to other failure symptom
paragraphs within TM 1–1520–238–T–3, references directing you to return to the respective chapter failure
symptom index within TM 1–1520–238–T–3 and to perform the next sequential failure symptom paragraph, and
references to technical manuals if the required CONDITION is met. Direct read codes are presented when possible
to reduce conversion time. Numbers not identified indicate a failure.
EXAMPLE:
PASS:
If CONDITION corresponds to proper mode for switch selected, go to paragraph
17–3.
1–14
FAIL.
FAIL provides location of fault and troubleshooting actions to be performed, references to other failure symptom
paragraphs, references to the failure symptom index and next failure symptom paragraph, references to other
chapters and paragraphs, and references to technical manuals if the required CONDITION is not met. Faults are
listed in the most probable failure sequences. ALWAYS troubleshoot wiring to isolate fault first, then replace LRU in
the order given, unless a direct replacement is indicated.
EXAMPLE:
FAIL: Location of fault: DEK, wiring from DEK to CPG MRTU Type III, CPG MRTU Type
III. Troubleshoot wiring to isolate fault (TM 9–1230–476–20–2).
1–15
MULTIPLEX READ CODES INTERPRETATION PROCEDURE.
a.
Check entry from log book failure symptom; RANGE DATA CANNOT BE DISPLAYED.
b.
Go to TM 1–1520–238–T–2 (Integrated Troubleshooting Master Failure Symptom Index) for appropriate MOC.
c.
Perform MOC.
d.
Go to TM 1–1520–238–T–3, Chapter 17.
e.
Go to FAILURE SYMPTOM INDEX in Chapter 17.
FAILURE SYMPTOM INDEX
Symptom
Refer to paragraph
DATA ENTRY KEYBOARD NO-GO
CPG COMPARTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17–1
KEYBOARD FAILED DISPLAYED ON ORT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17–1
RANGE DATA CANNOT BE DISPLAYED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17–2
f.
Go to failure symptom paragraph 17–2 referenced in FAILURE SYMPTOM INDEX, as an aid in locating fault.
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