Chamberlain SENTEX Infinity Series - SYSTEM WIRING AND POWER; Telephone and Processor Board Wiring

Rev C Doc 6001565 Page 5 of 31
PART 4 WIRING
A. TELEPHONE INTERFACE BOARD CONNECTIONS
Telephone Interface Board (SN1100329)
CLICK LEVEL
VR3
SPEAKER
LEVEL
VR4
HANDSET
TB1
PANEL
SPEAKER
J1
CLICK
DETECT
GROUND
1564F3
LINE
OFF HOOK
RING
CLICK LEVEL
Daughter Board (SN1110080)
TELCO LINE
MIC
SENS
PANEL
MIC
LINE BAL 2
LINE BAL 1
Figure 2: Telephone Interface Board Connections
Caution:
To avoid potential damage to the board, remove power to the unit before connecting or
disconnecting the phone line.
1. Connect a two conductor, 18 to 22 AWG cable (Belden Datalene #9501 or equivalent) to
TELCO LINE on the right lower corner of the telephone interface board’s daughter board (see
Figure 2).
2. Connect the other end of this cable to the "tip" and "ring" terminals on the telephone company
jack (polarity is unimportant).