Special Precautions
2200 SRM 1357
Special Precautions
DISCHARGING THE CAPACITORS
WARNING
The capacitor in the transistor controller can
hold an electrical charge after the battery is
disconnected. To prevent electrical shock and
personal injury, discharge the capacitor before
inspecting or repairing any component. Wear
safety glasses. Make certain the battery has
been disconnected. DO NOT use a screwdriver
to discharge the traction motor controller.
WARNING
To avoid personal injury and prevent electrical
shock, perform the following steps before per-
forming any troubleshooting or adjustments,
and connecting or disconnecting a handset or
PC.
CAUTION
To avoid controller damage, always disconnect
the battery. Discharge the capacitor and never
put power to the controller with any power
wire disconnected. Never short any controller
terminal or motor terminal to battery. Make
sure to use proper procedures when servicing
the controller.
1.
Move the truck to a safe, level area. Turn the
key switch to the OFF position and disconnect
the battery.
2.
Remove the drive unit compartment cover to ac-
cess the drive unit compartment.
3.
Discharge the capacitors in the controllers by
connecting a 200-ohm, 2-watt resistor across the
controller’s B+ and B
terminals. See Figure 5.
DO NOT short across the motor controller ter-
minals with a screwdriver or jumper wire.
4.
Remove the 200-ohm, 2-watt resistor before re-
connecting the battery.
1.
CONTROLLER
2.
POSITIVE CONNECTION
3.
INSULATED JUMPER WIRES
4.
200-OHM, 2-WATT RESISTOR
5.
NEGATIVE CONNECTION
Figure 5. Discharging Controller
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