General Fault Isolation; Visual Inspection; Power-Up Self-Test - GE Marquette MAC 5000 Field Service Manual

Troubleshooting: General Fault Isolation

General Fault Isolation

Visual Inspection

Area
I/O Connectors and Cables
Fuses
Interface Cables
Circuit Boards
Ground Wires/Wiring
Mounting Hardware
Power Source

Power-up Self-test

4-14
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.
Take the time to make all the recommended visual checks before
starting any detailed troubleshooting procedures
Table 4-6. 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 panes on PCBs
Faulty wiring, especially AC outlet
Circuit not dedicated to system
(Power source problems can cause static discharge, resetting problems, and noise.)
On power-up, the system automatically runs an internal self-test. If all
circuits test good, the start up screen displays.
MAC 5000 resting ECG analysis system
2000657-002
Look for the following problems
Revision B