MAINTENANCE MANUAL
IFR 4000
2-2-2
Page 4
Aug 1/04
TROUBLESHOOTING TABLE
NOTE:
The Troubleshooting Table lists common malfunctions found during normal operation or
maintenance of the Test Set or components. The tests or inspections and corrective
actions should be performed in the order listed. Failure to do so may result in
troubleshooting recommendations that replace working assemblies.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE
ACTION
1
External DC Power Supply failure
Step 1.
Connect External DC Power Supply to a verifiable AC Power Source.
Step 2.
Connect DMM to External DC Power Supply output.
Step 3.
18 Vdc (
±
1 Vdc)
If incorrect, probable source of failure is the External DC Power
Supply.
2
POWER Indicator does not light
Probable sources of failure are the circuit between Power Supply PCB
Assy and the LCD Assy and a short on the Multi-Function PCB Assy or the
RF Assy.
3
CHARGE Indicator does not light
Probable sources of failure are the Battery, Power Supply PCB A ssy and
the LCD Assy.
4 Blows
Fuse
Probable source of failure is the Power Supply PCB A ssy .
5
Battery does not charge
Probable source of failure is the Battery.
6
Display is blank or abnormality exists in Display
Probable sources of failure are the Power Supply PCB A ssy, Multi-
Function PCB Assy, LCD Assy and the interconnecting cables.
7 Keys
Inoperable
Probable sources of failure are the Keypad PCB Assy, Multi-Function PCB
Assy and the interconnecting cables.
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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