TM 1-1520-238-T-5
8–113
8–45.
CPG SDD PANEL – DOES NOT INDICATE FULL SCALE OR SHOW DIGITAL 888
8–45
(HELICOPTERS WITH CPG DIM/TEST PANEL INSTALLED)
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
Personnel Required:
68X
Armament/Electrical Systems Repairer (2)
References:
TM 1-1520-238-23
WARNING
Turn off power before detaching or
attaching wires and connectors. High
current 28 VDC or 115 VAC is present.
Failure to do so could result in death or
serious injury.
1. On CPG dim/test panel, hold
DGT OFF/NORM/TST switch to TST. Check for
short between P75–17 and ground.
Does short exist?
YES
Go to step 2.
NO
Repair open wire between
P75–17 and P73 SP1.
Go to paragraph 8–10.
2. Check for 2 to 5 VDC at P75–7 and P75–8.
Is voltage present?
YES
Go to step 3.
NO
Go to step 6.
3. Check for:
5 VDC at P75–12,
–8 VDC at P75–13,
8 VDC at P75–14.
Is voltage present?
YES
Go to step 4.
NO
Go to step 5.
4. Check for open between:
P75–9 and GS245–F,
P75–10 and GS245–G,
P75–11 and GS255–B.
Does open exist?
YES
Repair open wire.
Go to paragraph 8–10.
NO
Replace CPG SDD panel
(TM 1-1520-238-23).
5. Check for open between:
P75–12 and P401–19,
P75–13 and P401–13,
P75–14 and P401–5.
Does open exist?
YES
Repair open wire.
Go to paragraph 8–10.
NO
Replace SDC
(TM 1-1520-238-23).
6. Check for open between:
P75–7 and P1093–4,
P75–8 and P1093–7.
Does open exist?
YES
Repair open wire.
Go to paragraph 8–10.
NO
Replace CPG ENG INST
dimmer power supply
(TM 1-1520-238-23).
END OF TASK
