Battery Tests; Driving Voltage Tests - Elenco Electronics RCC-7K Assembly And Instruction Manual

Battery Tests

17
Install 4 fresh AA alkaline (or re-chargeable nickel-
cadmium) batteries in the battery cage, observing their
polarity while doing so.
Snap in the battery cover to close it.
Battery Voltage: Using a multimeter set to DC volts,
measure between the front-left and front-right battery
contacts. You should measure about 6V.
Idle Current: Set the ON/OFF switch to OFF. Set your
multimeter to DC amps. Connect your probes between
the left-front battery tab and the red wire from
connection point 3 on the PCB. You should measure a
current of 18 mA ± 8 mA. Check your work if you don't.

Driving Voltage Tests

Set the switch to ON and your multimeter to DC volts.
Connect (-) probe to the front-right battery contact (DC
ground) for all these tests. Activate the transmitter for
forwards/backwards while measuring the voltage at pins
10 & 11 on the AF2311 IC.
Note: You may need to clip a wire from the antenna on the
remote control unit to the antenna solder pad (next to C1),
since the car's antenna is not attached yet.
Pin 10
TX: forward 0 V
TX: backward 3.0 ± 0.5 V
If you don't get these voltages check your receiver and
AF2311 support circuitry. Refer to Theory of Operation as
needed.
Similarly, measure the voltages at the Q6-Q8 and Q5-
Q7 junctions while transmitting commands:
Q6-Q8 junction
TX: forward
TX: backward 6 ± 1 V
If you don't get these voltages check your driving circuit.
Pin 11
3.0 ± 0.5 V
0 V
Q5-Q7 junction
0 V 6 ± 1 V
0 V
Q6-Q8 junction
-22-
Antenna solder pad
Q5-Q7 junction