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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.

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