Aeroflex 3500A - Troubleshooting

2-2 Subject to Export Control, see Cover Page for details.
2-2. TROUBLESHOOTING
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.
This manual cannot list all malfunctions that may occur, nor all tests or inspections and corrective
actions. Perform tests/inspections and corrective actions in order listed.
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.
After the faulty assembly has been located, refer to para 2-4 for remove/replace instructions.
2-2-1. TROUBLESHOOTING GUIDELINES
The Test Set has a built-in Self Test to assist the technician in troubleshooting.
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.
2-2-2. EQUIPMENT INSPECTION
The following inspection procedures are used to locate obvious malfunctions with the Test Adapter:
 Inspect all external surfaces of the Test Adapter for physical damage, breakage, loose or dirty
contacts and missing components.
WARNING
DANGEROUS VOLTAGES ARE PRESENT WITH COVERS REMOVED.
CAUTION
DO NOT DISCONNECT OR REMOVE ANY BOARD ASSEMBLIES IN THE TEST
ADAPTER UNLESS INSTRUMENT IS UNPLUGGED. SOME ASSEMBLIES
CONTAIN DEVICES THAT CAN BE DAMAGED IF BOARD 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.
 Inspect printed circuit board surfaces for discoloration, cracks, breaks and warping and
printed circuit board conductors for breaks, cracks. cuts, erosion or looseness.
 Inspect all assemblies for burnt or loose components.
 Inspect all chassis-mounted components for looseness, breakage, loose contacts or
conductors.
 Inspect Test Set for disconnected, broken, cut, loose or frayed cables or wires.