Visual Inspection - GE MAC 600 SPY Service Manual

Visual Inspection

3-4
Troubleshooting: General Fault Isolation
A visual inspection of the equipment can detect disconnected cables,
debris on circuit boards, missing hardware, and loose components. These
could cause symptoms, and equipment failures.
NOTE
Perform the visual checks before starting any troubleshooting
procedures.
Table 3-1. Visual Inspection List
Sl No: Area
1 I/O connectors and
cables and AC power
cord
2 Interface cables
3 Circuit boards
4 Ground wires/wiring
5 Fasteners
6 Power source
7 Keypad
8 LCD display
9 Battery pack
TM
MAC 600
2047426-002
Look for:
Fraying or other damage

Bent prongs or pins

Cracked housing

Loose screws in plugs

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 feed through, 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.)
Cuts or cracks in keypad membrane

Illegible labels

Scratched or opaque display filter
Cracked, swollen, or leaky battery pack

enclosure
Debris on battery pack electrical contacts

Revision G