Thomas & Betts Corporation RC3901T ユーザーズマニュアル

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Libra Wireless Door Chime with Light 
Instructions for Model No. RC3920 
 
IMPORTANT NOTICE – This device complies with Part 15 of the FCC Rules.  Operation is subject to 
the following two conditions: (1) this device may not cause harmful interference, and (2) this device 
must accept any interference received, including interference that may cause undesired operation. 
 
Enclosed you will find: 
• 
 Pushbutton Transmitter (RC3901T) 
• 
 Door Chime (RC3923R) 
• 
 Door Chime wall hanging bracket (including  screws and wall plugs for mounting) 
• 
 Adhesive pad and screws for mounting the Transmitter 
 
Tools/supplies needed: 
• 
 2 (C size) alkaline batteries for the Door Chime.  We recommend that only long -life            
alkaline batteries are used (e.g. Duracell or Energizer).  This product will not work 
with NiCd rechargeable batteries. 
• 
 A small flathead screwdriver 
• 
 A Phillips crosshead screwdriver 
 
Installation 
 
Note:  Positioning the transmitter or Door Chime on or near metal structures or other metallic 
objects or doorframes may reduce the transmission range. 
 
Pushbutton Transmitter 
You can attach the transmitter directly onto your doorframe using the adhesive pad.  Make 
sure the surface on which it is to be placed is clean and dry.  Alternatively open the front 
cover using a flathead screwdriver (Illustration 1) and mount using the screws provided (See 
Illustration 2), ensuring that the rubber grommets remain in place. 
 
To ensure weatherproofing is maintained, always mount the Transmitter in the upright 
position shown in Illustration 2 and replace the front cover securely. 
 
When the Transmitter button is pressed, the Indicator Light (A on Illustration 1) will 
illuminate to show that the Transmitter is working.  When it does not illuminate, the battery 
needs to be replaced.  Use a CR2032 Lithium Coin Cell battery, inserting it as shown in 
Illustration 3. 
 
Door Chime Receiver 
Remove the battery compartment cover and insert the two (C size) alkaline batteries as 
shown in Illustration 4.