Ac Power Light; Touchpad Volume Control; Charging Voltage Adjustment (Factory Set); Clock Speed Adjustment (Factory Set) - Regency 4720 Installation Manual

Regency ® Model 4720 Control/Communicator Installation Manual (P/N 150476, Rev. A)

AC Power Light

3.6
The green AC power light is on whenever AC power is present, the DC power switch is in the ON position
and all fuses are intact.

Touchpad Volume Control

3.7
The touchpad volume control is a potentiometer which controls the volume of the trouble alert and
annunciator tones at the internal speakers. Rotate the control clockwise to increase the volume.

Charging Voltage Adjustment (Factory Set)

3.8
This is used to adjust the voltage level that charges the back up battery. This potentiometer is adjusted at the
factory. Do NOT attempt to adjust the potentiometer in the field as it may result in damage to the battery.

Clock Speed Adjustment (Factory Set)

3.9
Used to adjust the accuracy of the real-time clock. This adjustment is made at the factory.

Cable Connectors

3.10
Model 4660C Series Touchpad Connector—Troubleshooting (P1)
3.10.1
The PLC connector is a 4-pin connector that is used to connect the Model 4660 series touchpads for
troubleshooting.
The following table lists the four (4) pins and shows which terminal each connects to on the Model
4660C/4660R touchpad
.

Status Connector (P2)

3.10.2
The Status connector is a 5-pin connector used to connect the Model 4180 Status Display Module to
the Model 4720.

Phone Line Monitor Connector (P5)

3.10.3
This 12-pin connector is used to mount the Model 4175 Dual Phone Line Monitor Module onto the
Model 4720 printed circuit board.

Intercom Module Connector (P6)

3.10.4
This 12-pin connector is used to connect the Model 4140 Intercom Module ICOM connector to the
Model 4720 printed circuit board. The 7369 Listen-in Module can also be connected here, if the
Model 4140 is not used.

Expansion Connectors (P3 and P4)

3.11
The Expansion Bus connectors are used to connect any two (2) of the models listed below. The Models
4110 - 4150 also have two (2) connectors, allowing them to be daisy-chained together. Expansion bus
wiring should not exceed four (4) feet in length and must be run in conduit.
PLC Connector (4-pin)
1
2
3
4
4600B/C/R Touchpad
1
2
3
4
12
Revised 10/98