11 
Switching on for the first time 
1.1. Charging the transmitter battery (maximum charge current 1 A) 
First connect the charge lead (Order No. 12 5023) to the battery charger, then 
connect the charge lead to the transmitter. 
Charging the battery – important: 
•• Automatic battery fuse 
The battery of your PROFI CAR features an integral thermal fuse which protects the 
battery from excessive currents if a short-circuit should occur. 
This transmitter must be used with a genuine MULTIPLEX battery 
fitted with this type of fuse! 
!! 
If a short-circuit occurs and the fuse trips, the fuse element will reset itself about 
1 minute after the fault is corrected, and the unit will then work again normally. 
•• Charging the battery - note: 
If you charge at the standard (slow) rate, no restrictions apply.   
If you fast-charge the battery using a charger with automatic termination, the charge 
current must not exceed 600 mA. Exceeding this rate may cause the thermal fuse to 
trip, and the charge process will be interrupted prematurely. 
1.2. Charging the receiver battery 
Observe the manufacturer’s notes on charging, as printed on the battery. 
Do not exceed the stated charge currents! 
1.3. Fitting the transmitter crystal 
Transmitter crystals have a blue sleeve and bear the code letter „S“ before the 
channel number. Ensure that the transmitter and receiver crystals are on the same 
channel. 
Plug the transmitter crystal into the RF module (see picture on page 2). 
Please be very careful when handling crystals: 
v  Don’t drop them 
v  Don’t force a crystal into its socket 
v  Protect them from vibration in use and in storage 
1.4. Adjusting the trigger loop 
You can adjust the trigger loop to suit your finger size by loosening the screw in the 
trigger. 
CAUTION: don’t over-tighten the screw after making the adjustment, as this could 
loosen the nut pressed into the other side!