Printed in the U.S.A.
ZF300370 Rev C
Fax Back Doc # 695
Due to the dynamic nature of the product design, the information contained in this document is subject to change without notice. Viking
Electronics, its affiliates and/or subsidiaries assume no responsibility for errors and/or omissions contained in this information. Revisions of
this document or new editions of it may be issued to incorporate such changes.
Product Support Line...(715) 386-8666 Fax Back Line...(715) 386-4345
A. Headsets
Connect the receive pair (typically the inside pair) of an Electronic or Digital phone handset jack, using the special
“T” adapter provided, to the red and green wires of a modular telephone jack assembly as shown below. Connect
the 12V DC power supply to the yellow and black wires. When audio going to the handset or headset is detected,
the VR-1A will flash to show others that you are on the phone.
Installation/Applications
B. Electronic and Digital Phones
Connect the speaker leads of an Electronic or Digital phone to the red and green and connect the 12V DC power
supply to yellow and black using a modular telephone jack assembly as shown below. The speaker may be
disconnected if a resistor of equal value is substituted. The VR-1A will flash to indicate ringing.
C. Analog Phones
Connect tip and ring to the green and red and connect the 12V DC power supply to yellow and black using a
modular telephone jack assembly as shown below. The VR-1A will flash to indicate ringing, light steady when the
phone is off hook, follow the cadence of 90 to 125V message waiting voltage and gives a “stutter” flash if message
waiting “stutter” dial tone is detected.
Yellow
Black
120V AC
VR-1A
Telephone jack assembly
Radio Shack part # 279-355
or Suttle part # SE-625A4
Yellow
Black
Green
Red
“T” adapter
Standard Analog Phone
120V AC
VR-1A
(Cord not included)
Telephone jack assembly
Radio Shack part # 279-355
or Suttle part # SE-625A4
Yellow
Black
“T” adapter to handset
jack on phone
Headset
Electronic/Digital Phone
120V AC
VR-1A
Green
Red
(Cord not included)
Telephone jack assembly
Radio Shack part # 279-355
or Suttle part # SE-625A4
Internal view of a
typical key set
telephone
Green
Red
(Cord not included)
Adjust the sensitivity with the trim
pot if necessary. Turn clockwise
to increase sensitivity.
Adjust the sensitivity with the trim
pot if necessary. Turn clockwise
to increase sensitivity.
“Stutter” dial tone detection may
require adjusting sensitivity.
Start with the trim pot in the
center position.
