GE MAC 800, Service Manual

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Troubleshooting
2031504-159D MAC™ 800 3-3
Visual Inspection
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
If the area is… Look for…
I/O Connectors and Cables
AC power cord

Fraying or other damage

Bent prongs or pins

Cracked housing

Loose screws in plugs
Interface cables

Excessive tension or wear

Loose connection

Strain reliefs out of place
Circuit boards

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
Ground wires/Wiring

Loose wires or ground strap connections

Faulty wiring

Wires pinched or in vulnerable position
Fasteners Loose or missing screws or other hardware, especially
fasteners used as connections to ground planes on PCBs
Power source

Faulty wiring, especially AC outlet

Circuit not dedicated to system
NOTE
Power source problems can cause static discharge,
reading problems, and discharge.
Keyboard

Cuts or cracks in the keyboard membrane

Unreadable labels
LCD display filter Scratches or cracks in the display filter (transparent part of
keyboard bezel) that impair viewing
Battery pack

Cracks, swells, or leaks in the battery casing

Dirt, scratches, or debris on contacts
SD card

Cracks

Dirt, scratches, or debris on contacts