LiftMaster 61LM Owners Manual - Page 136

TRANSMITTER: MODELS 50C & 51C INSTRUCTIONS The code in Chamberlain Radio Controls can be easily set or changed. Choose your own code by changing position of switches numbered 1 through 8 on the code switch block. Changing the position of only one switch makes an entirely different code. The original transmitter is preset at the same coded signal as the receiver. The code in any NEW transmitters must be set to match the code in the original transmitters and the receiver. PROCEDURE: With visor clip off, remove screw in original an and new transmitters as shown in Figure 1. Carefully turn cases over (push button sides up). Remove case tops as shown in Figure 2. CAUTION: DO NOT MOVE CIRCUIT BOARD COMPONENTS. Place transmitter circuit boards side by side as shown in Figure 3. Set the code switches in the new transmitter to match those in the original transmitter. Use a pen or screwdriver to slide the switches. CHANGING YOUR CODE IN RECEIVER AND TRANSMITTER(S) DISCONNECT POWER TO OPENER BEFORE CHANGING THE CODE IN THE RECEIVER. The receiver is located on the back panel of the opener chassis. The code switch block is shown in Figure 4.IF YOU CHANGE THE CODE IN YOUR RECEIVER, ALSO CHANGE THE CODE IN YOUR TRANSMITTER(S). PROCEDURE: Hold transmitter circuit board alongside receiver code switch block as shown. To change the code, slide one or more receiver code switches to a plus, (0) or minus position. Set code switches in the transmitter(s) to match the new receiver code. IMPORTANT NOTE: Code settings must be exactly the same in the receiver, transmitter and all additional transmitters used to operate the door. please keep this instruction manual for future reference. 114A966 Printed in Mexico