Komatsu 830E Shop Manual page 156

1. Electric shock can cause serious or fatal injury. Only qualified electrical maintenance per-
sonnel should perform electrical testing. Use caution during test procedures to protect per-
sonnel from injury. All potential testing should be considered hazardous and proper
precautions are necessary.
2. General Electric DOES NOT recommend removing control cards or panel connectors prior to
welding. When welding on a truck, connect the welder's ground cable directly to, or as close
as possible to the part being welded. Welder cables should not be placed near truck system
power cables or wiring harnesses.
3. Any time one of the plug-in circuit cards must be removed or reinstalled, be certain that the
control power switch is "Off". Wear a properly grounded wrist strap when removing a card to
prevent damage caused by static electricity. After card removal, place in a static proof bag or
container.
4. Extreme care should be exercised to prevent damage to the various semi- conductor devices
and low impedance circuits under test. When using an ohmmeter to check diodes, transis-
tors and low power conductors, care must be used when using the ohms x 1 scale. Excessive
current can damage the meter. When using the Hi-pot tester or megger, disconnect the 104
pin connectors CNA, CNB, CND and CNE located at the top of the 17FL275 panel. Refer to the
GE publication "VEHICLE TEST INSTRUCTIONS FOR OHV STATEX III SYSTEMS" for addi-
tional instructions.
5. Do not make open circuit voltage checks in propulsion mode.
6. Parking brakes and service brakes have to be released for some tests. When this occurs,
make sure wheels are blocked.
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