MAINTENANCE MANUAL
IFR 6000
2-2-2
Page 1
Aug 1/06
2. Troubleshooting Procedures
A. Guidelines
Troubleshooting is divided into a Symptom Index and a Troubleshooting Table.
The Troubleshooting Table lists common malfunctions which may occur during operation of
Test Set. Perform tests/inspections and corrective actions in order listed.
NOTE: This manual cannot list all malfunctions that may occur, nor all tests or inspections
and corrective actions.
NOTE: If a malfunction is not listed or is not corrected by listed corrective actions, the
troubleshooting technique (the formulation of a logical approach in locating the
source of trouble) is left to the technician’s discretion.
Following is a list of aids to be used when troubleshooting the Test Set:
O The Test Set has a built-in Self Test to assist the technician in troubleshooting.
O Many problems on Test Sets in service are caused by corrosion. Sometimes removing
and reseating an affected cable or circuit card corrects the malfunction. Cleaning
connector and/or switch contacts with alcohol repairs many types of digital and analog
circuit malfunctions.
O The following inspection procedures are used to locate obvious malfunctions with the
Test Set:
O Inspect all external surfaces of the Test Set for physical damage, breakage, loose or
dirty contacts and missing components.
CAUTION: DO NOT DISCONNECT OR REMOVE ANY BOARD ASSEMBLIES IN THE
TEST SET UNLESS THE UNIT IS REMOVED FROM ANY AC POWER
SOURCES. SOME ASSEMBLIES CONTAIN DEVICES THAT CAN BE
DAMAGED IF THE ASSEMBLY IS REMOVED WHEN POWER IS ON.
SEVERAL COMPONENTS, INCLUDING MOS DEVICES, CAN BE
DAMAGED BY ELECTROSTATIC DISCHARGE. USE CONDUCTIVE
FOAM AND GROUNDING STRAPS WHEN SERVICING IS REQUIRED
AROUND SENSITIVE COMPONENTS. USE CARE WHEN UNPLUGGING
ICS FROM HIGH-GRIP SOCKETS.
O Inspect printed circuit board surfaces for discoloration, cracks, breaks and warping
and printed circuit board conductors for breaks, cracks. cuts, erosion or looseness.
O Inspect all assemblies for burnt or loose components.
O Inspect all chassis-mounted components for looseness, breakage, loose contacts or
conductors.
O Inspect Test Set for disconnected, broken, cut, loose or frayed cables or wires.
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