Valcom V-136RTHF Service Manual

V-136RTHF

36 ZONE TALKBACK INTERCOM/

PAGE CONTROL UNIT

GENERAL

The V-136RTHF is a single-path dial select
microcomputer controlled intercom and page control
unit used with a 1A2 key system or a PABX trunk
port to provide 36 zones of handsfree talkback
paging.

The V-136RTHF control unit has received an FCC
type KX registration; designed to be used with FCC
registered Key Telephone Systems. In accordance
with FCC rules with applicable tariffs, this Paging
Unit may only be installed with the authorization of
the host system. Installations may be made by
Valcom, Inc., an authorized agent of the same,
equipment manufacturers, telephone companies,
registered telephone refurbishers, and those qualified
for installation of FCC register ed systems under FCC
Rules Section 68.215. The FCC Registration
Number, BAF9I7-69358-KX-N, will be listed in the
affidavits filed with the telephone company; it will
also be recorded in the system log kept by installation
and maintenance personnel. The local telephone
company is to be notified when this intercom unit is
installed.

SPECIFICATIONS

Features

• 36 zone

• Dial tone

• Ringback tone

• Single or double signaling

• Combination rotary/tone

• Last number diale d rering

• Dial/rering tone mute

• Mixed bell and buzzer operation

• Mixed one-way page and bell or buzzer

operation

• Mixed two-way (handsfree) page and bell or

buzzer operation

• 36 station one-way page (using one-way

amplified speakers)

• All call (requires V-1134 and reduces number of

zones to 34)

VSP-V-136RTHF

Issue 6

• Can be used with a variety of Valcom 45 ohm

talkback speakers and paging horns

Numbering Plan

• The dialing codes are 0, 5 - 39.

Additional Equipment Required

• Valcom -24 Vdc power supply (1A2 type power

supply for buzzers)

• Twisted pair cross-connect wire

• 22-24 AWG power wire or cable, and

• Volt-ohm-milliammeter

Dimensions/Weight

• 7.1"H x 5.9"W x 2.1"D

(18.03cm H x 14.99cm W x 5.33cm D)

• 3.5 lbs. (1.6 Kg)

Power Requirements

Voltage Working Limits Current

Talk Battery -21.5 to –26 Vdc 90 mA
Signal Battery -21.5 to –26 Vdc 500 mA
Lamp Battery 9 to 11 Vac 45 mA per lamp

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Electrical Characteristics

Parameter Working Limits
Input Imp. T and R 600 ohm (incl. inst.)

Max. Cable Le ngt h:
One Way Page 5000 feet
Talkback Page 800 feet

Dial Pulses 8-12 PPS

60-40 Break ratio " 10%

Tone Signals
Standard DTMF

Frequency
Detect 40MS
Interdigital Time 40M S

Environmental
Temperature 0o to 50o C
Humidity 0 to 85%

Non-precipitating

For off-hook speaker cancel circuit, each ICM "A"
lead must be connected through a 1 0K 1/4W 5%
resistor to the inhibit input (W/GR) (Refer to Figures
2 and 3). When "called" station or any other party
goes off-hook, t he presence o f t wo resistance grounds
cancels or turns off speaker. "Handsfree" mode can
only be restored by terminating call and redialing
station.

Mounting

Mount the V-136RTHF on a 7" KTU mounting, relay
rack or on a wall. (The presence of a large
"magnetic" field induced by some power supplies
may cause a loud 60 cycle hum on talk paths. To
clear or reduce hum, mount control unit at least 12"
from power supply).

Connections

Fasten a 25 pair cable to the unit and terminate all
leads on a 66 type block per Figure 1, 2 or 3.
CAUTION: Do not attempt to wire one group (10-29
or 0, 5-9, 30-39) for both bell/buzzer and voice page.

INSTALLATION

Precautions

All precautions have been taken at the factory to
insure that the equipment functions properly when
installed correctly. Please observe the following
precautions before applying power to the equipment
or the equipment may be damaged and the warranty
voided.
a. Unplug the key system power supply before

connecting any wires or cables from the
intercom connecting block. With power
ON, accidental bridging of two terminals
with a wiring tool may damage electronic
circuits.

b. Do not locate the control unit more than five

feet from the power supply.

c. Do not use a lamp tester to check signals in

the control unit. Use a voltmeter. A lamp
tester when first applied, is a short circuit to
electronic circuits.

d. Do not apply power to the control unit until

all connections have been double-checked.

Limit runs to talkback speakers to not more
than 800 feet. Do not split pairs.

Make all grounds common at power supply.

Limit audio runs to one-way speakers to not more
than 5000 feet. Limit power runs to one-way
speakers to maximum recommended for the particular
speaker type.

Bell/Buzzer Connections
a. When using 10-29 for bell/buzzer signaling,

connect audible battery (BR/V) to S1 IN
(V/O).

b. When using 0, 5-9, and 30-39 for bell/buzzer

signaling, connect audible battery to S2 IN
(O/V).

c. Connect bell/buzzer return leads to audible

ground from power supply.

Voice Page Connections
a. When using 10-29 for voice page, connect

speaker out (V/G) to S1 IN (V/O).

b. When using 0, 5-9 and 30-39 for voice page,

connect speaker out (V/G) to S 2 IN (O/V).

c. Connect speaker return leads to speaker

common (G/V).

Programming

Refer to Figure 1 for programming options.

OPERATION

To make a voice page, go off-hook and di al the
number of the desired zone or station. Dial tone will
be broken after the first number is dialed. A one
second ringback tone will indicate the called zone is
being signaled. After the tone, proceed with the page.
The called party may answer handsfree. If the
speaker cancel circuit is wired (refer to Installation),
when called party goes off hook, the speaker will be
turned off.

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To rering the same station, press the "*" button. The
station will be signaled as long as the * button is held.
To rering usi ng rotary dial, dial "1" . The station will
be signaled for one second each time a "1" is dialed.

To achieve ma ximum performance fr om thi s system,
the user should receive the following operating
instructions:
a. The calling party should speak directly into

telephone mouthpiece and avoid speaking
too softly.

b. The called party must wait (approximately

1/2 second) before responding to the calling
party.

CIRCUIT DESCRIPTION

General Method of Operation

This unit provides dial intercom access provisions to
appropriately interface with the telephone system
being used. A two-way amplifier conditions the
speech from the telephone system tip and ring, and
provides a low impedance, low level output to the
desired speaker via conventional telephone wiring,
i.e., house cable or station wire.

Detailed Description

When station user lifts handset to make an ICM page,
the switchhook contacts in the telephone close the tip
and ring to form a loop which returns battery back to
turn on transistor Q1. Transistor Q1 operates relay
and logic circuit to return dial tone and lamp battery
to telephone set. Logic circuit receives dialing
information and operates relays and/or circuitry to
supply splash tone and a two-way voice connection
for station selected. When called or any other party
goes off-hook on ICM path, the presence of two
resistance grounds cancels or turns off speakers if
inhibit resistors are wired. "Handsfree mode" can
only be restored by terminating call and redialing
station.

TECHNICAL ASSISTANCE

When trouble is reported, verify that:

• All telephone sets are in proper working order

• Power is being supplied to the unit

• There are no broken connections at the

connecting block

• The conductors of color-coded cables are

terminated in the proper order
If trouble still exists, additional checks should be
made using the follo wing equipment:

• Voltmeter

• Tone-dial single-line instrument (for tone-dial

systems)

• Telephone Test Set

• Clip leads

Test lamps must not be used to check voltages. They
can damage electronic circuits. A telephone test set
should not be used to check voltages; the results will
be misleading.

Before proceeding further, check the voltages at the
connecting block. An undetected blown fuse or low
voltage will cause improper control operation. DC
voltage measurements are made with respect to (+)
ground.

If a spare unit is available, continue to troubleshoot by
substituting the spare unit for the suspected unit. If the
trouble has not been located, refer to Table 1. Identify
the symptoms and perform the corrective actions
indicated. After all the suggested tests have been
performed, the trouble still exists, telephone Valcom,
Inc. at [phone] and ask for Technical Support,
or call [phone] for Valcom 24-hour Automated
Support or visit our website at
http://www.valcom.com.

Valcom equipment is not field repairable. Valcom,
Inc. maintains service facilities in Roanoke, VA.
Should repairs be necessary, attach a tag to the unit
clearly stating company name, address, phone
number, contact person, and the nature of the
problem. Send the unit to:

Valcom, Inc.

Repair and Return Dept.

5614 Hollins Road

Roanoke, VA 24019-5056

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