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Figure 1–2. CPG Data Entry Keyboard (ADC) and CDU (ADD) | Up
TM-1-1520-238-T-3 Army Model AH-64 Helicopter (NSN
1520-01-106-9519) (EIC: RHA) Multiplex Read Codes Manual | Next
CHAPTER 2 AIR DATA SYSTEM (ADS) MULTIPLEX READ CODES |
TM 1–1520–238–T–3
1–10
Change 5
j.
Enter all six digits of the memory location via the DEK (ADC) or CDU (ADD) keyboard.
EXAMPLE:
MEMORY LOCATION: 000444
Press and release the following keys:
(¿)/0, (¿)/0, (¿)/0, JKL/4, JKL/4, and JKL/4 (ADC)
Press and release the following keys:
0, 0, 0, 4, 4, and 4 (ADD)
k.
When all six digits have been entered, the number will appear on the heads out display (HOD) (Fig. 1–1) (ADC).
l.
When all six digits have been entered, depress VAB 1. The number will appear on the CDU (Fig. 1–1.1). Up to
four memory locations can be examined at one time by using VABs 1 through 4. Depressing VAB 5 (HEX) will
convert octal to hexadecimal (ADD).
m. Assume 026042 appears on HOD (ADC) or CDU (ADD). The fourth digit displayed on HOD (ADC) or CDU
(ADD) is 6, which indicates a PASS condition, go to paragraph 17–3.
EXAMPLE:
17–3 SIGNAL NAME:
DEK DATA VALID
MEMORY LOCATION: 000444
MEMORY DATA BIT(S):
7
(BINARY)
CONDITION:
(None)
SIGNAL FUNCTION:
Indicates whether keyboard entry is valid and to be read by FCC
or keyboard entry is invalid and to be ignored.
REMARKS: From DEK through CPG MRTU Type III to FCC. This bit identifies
erroneous DEK data words.
PASS:
If fifth digit on HOD is 1, 3, 5, or 7, go to paragraph 17–4.
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.
n.
The fifth digit on HOD (ADC) or CDU (ADD) is 2, which indicates a FAIL condition. Troubleshoot wiring by using
FAIL information in paragraph 17–3.
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