MAINTENANCE MANUAL
IFR 4000
2-2-2
Page 7
Aug 1/04
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE
ACTION
20
TONE Field Select Key Failure
Probable sources of failure are the Keypad PCB Assy, Multi-Function PCB
Assy and the interconnecting cables.
21
M MOD Field Select Key Failure
Probable sources of failure are the Keypad PCB Assy, Multi-Function PCB
Assy and the interconnecting cables.
22
SETUP Key Failure
Probable sources of failure are the Keypad PCB Assy, Multi-Function PCB
Assy and the interconnecting cables.
23
G/S DDM UP Key Failure
Probable sources of failure are the Keypad PCB Assy, Multi-Function PCB
Assy and the interconnecting cables.
24
LOC DDM LEFT Key Failure
Probable sources of failure are the Keypad PCB Assy, Multi-Function PCB
Assy and the interconnecting cables.
25
G/S DDM DOWN Key Failure
Probable sources of failure are the Keypad PCB Assy, Multi-Function PCB
Assy and the interconnecting cables.
26
LOC DDM RIGHT Key Failure
Probable sources of failure are the Keypad PCB Assy, Multi-Function PCB
Assy and the interconnecting cables.
27
BACKLIGHT Key Failure
Probable sources of failure are the Keypad PCB Assy, Multi-Function PCB
Assy and the interconnecting cables.
28
CONTRAST Key Failure
Probable sources of failure are the Keypad PCB Assy, Multi-Function PCB
Assy and the interconnecting cables.
29
DECREMENT/SELECT Data Key Failure
Probable sources of failure are the Keypad PCB Assy, Multi-Function PCB
Assy and the interconnecting cables.
30 Verification
Failure
Step 1.
Perform Calibration (para 2-2-3F).
Step 2.
If Calibration does not clear failure, probable sources of failure are the
Multi-Function PCB Assy and the RF Assy.
Summary of Contents for IFR 4000
Page 1: ...NAV COMM Test Set Maintenance Manual 1002 5600 4P0 IFR 4000...
Page 3: ...MAINTENANCE MANUAL IFR 4000 FOR QUALIFIED SERVICE PERSONNEL ONLY...
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Page 166: ...MAINTENANCE MANUAL IFR 4000 2 3 1 Page 6 Aug 1 04 STEP PROCEDURE 4 Remove the Fuse...
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