MSL LOWER CHANNEL CODE COMMAND

CPG LOWER QUANTITY SW (ACY) CPG LOWER CHAN SW (ACZ)

ACQUAID SLAVE COMMAND (ACY) ACQ AID MODE CMD (ACZ)

TM-1-1520-238-T-3 Army Model AH-64 Helicopter (NSN
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TM 1–1520–238–T–3 8–302 8–1150 SIGNAL NAME: MSL LOWER CHANNEL CODE COMMAND MEMORY LOCATION: 001441 MEMORY DATA BIT(S): 17–19 (OCTAL) CONDITION: If the first digit displayed on HOD is 0=H If the first digit displayed on HOD is 1=G If the first digit displayed on HOD is 2=F If the first digit displayed on HOD is 3=E If the first digit displayed on HOD is 4=D If the first digit displayed on HOD is 5=C If the first digit displayed on HOD is 6=B If the first digit displayed on HOD is 7=A SIGNAL FUNCTION: Indicates which of eight laser codes of the day is selected in the lower pushbutton index select switch. REMARKS: From CPG FCP to RHE. PASS: If first digit on HOD corresponds to selected code, go to paragraph 8–1151. FAIL: Location of fault: CPG FCP, wiring from CPG FCP to RHE, RHE. Troubleshoot wiring to isolate fault (TM 9–1427–475–20). 8–1151 SIGNAL NAME: MSL LOWER CHANNEL CODE SW MEMORY LOCATION: 000437 MEMORY DATA BIT(S): 4–6 (OCTAL) CONDITION: If the sixth digit displayed on HOD is 0 and the fifth digit is 0 or1=H If the sixth digit displayed on HOD is 0 and the fifth digit is 2 or 3=G If the sixth digit displayed on HOD is 0 and the fifth digit is 4 or 5=F If the sixth digit displayed on HOD is 0 and the fifth digit is 6 or 7=E If the sixth digit displayed on HOD is 1 and the fifth digit is 0 or 1=D If the sixth digit displayed on HOD is 1 and the fifth digit is 2 or 3=C If the sixth digit displayed on HOD is 1 and the fifth digit is 4 or 5=B If the sixth digit displayed on HOD is 1 and the fifth digit is 6 or 7=A SIGNAL FUNCTION: Indicates CPG has selected lower laser coding. REMARKS: From CPG FCP through CPG MRTU Type III to RHE. PASS: If CONDITION corresponds to selected code, go to paragraph 8–1152. FAIL: Location of fault: CPG FCP, wiring from CPG FCP to CPG MRTU Type III, CPG MRTU Type III. Troubleshoot wiring to isolate fault (TM 9–1427–475–20). 8–1152 SIGNAL NAME: MSL LOWER CHANNEL CODE MEMORY LOCATION: 001343 MEMORY DATA BIT(S): 17–19 (OCTAL) CONDITION: If the first digit displayed on HOD is 0=H If the first digit displayed on HOD is 1=G If the first digit displayed on HOD is 2=F If the first digit displayed on HOD is 3=E If the first digit displayed on HOD is 4=D If the first digit displayed on HOD is 5=C If the first digit displayed on HOD is 6=B If the first digit displayed on HOD is 7=A SIGNAL FUNCTION: Indicates lower laser code being used by RHE. REMARKS: From RHE to FCC. PASS: If first digit on HOD corresponds to selected code, go to paragraph 8–1155. FAIL: Location of fault: replace RHE (TM 9–1427–475–20).

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