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Visual Inspection
Area
I/O Connectors and Cables
Fuses
Interface Cables
Circuit Boards
Ground Wires/Wiring
Mounting Hardware
Power Source
4-10
Troubleshooting: General Fault Isolation
A thorough visual inspection of the equipment can save time. Small things—
disconnected cables, foreign debris on circuit boards, missing hardware, loose
components—can frequently cause symptoms and equipment failures that may
appear to be unrelated and difficult to track.
NOTE
Take the time to make all the recommended visual checks before starting any
detailed troubleshooting procedures.
Table 1. Visual Inspection List
Fraying or other damage
Bent prongs or pins
Cracked housing
Loose screws in plugs
Type and rating. Replace as necessary.
Excessive tension or wear
Loose connection
Strain reliefs out of place
Moisture, dust, or debris (top and bottom)
Loose or missing components
Burn damage or smell of over-heated components
Socketed components not firmly seated
PCB not seated properly in edge connectors
Solder problems: cracks, splashes on board, incomplete feedthrough, prior modifications or repairs
Loose wires or ground strap connections
Faulty wiring
Wires pinched or in vulnerable position
Loose or missing screws or other hardware, especially fasteners used as connections to ground
planes on PCBs
Faulty wiring, especially AC outlet
Circuit not dedicated to system
(Power source problems can cause static discharge, resetting problems, and noise.)
MAC™ 3500 Resting ECG Analysis System
2021337-036
Look for the following problems
Revision L
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