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

3 947137

Valcom, Inc. warrants its products to be free from defects in materials and w orkmanship under conditions of normal use and

VALCOM LIMITED WARRANTY

service for a period of one year from the date of shipment. The obligation under this warranty shall be limited to the
replacement, repair or refund of any such defective device within the warranty period, provided that:

1. inspection by Valcom, Inc. indicates the validity of the claim,

2. the defect is not the result of damage, misuse, or negligence after the original shipment,

3. the product has not been altered in any way or repaired by others and that factory sealed units are
unopened (A service charge plus parts and labor will be applied to units defaced or phy sically
damaged),

4. freight charges for the return of products to Valcom are prepaid,

5. all units 'out of warranty' are subject to a service charge. The service charge will cover minor
repairs (major repairs will be subject to additional charges for parts and labor).

This warranty is i n lieu of and excludes all other warranti es, expressed or implied, and in no event shall Valcom, Inc.
be liable for any anticipated profits, consequential damages, loss of time or ot h er losses incurred by the bu yer in
connection with the purchase, operation or use of the product.

This warranty specifically excludes damage incurred in shipment in the event a product is received in damaged condition, the
carrier should be notified immediately. Claims for such damage should be filed with the carrier involved in accordance with
the F.O.B. point.

Headquarters: In Canada:

Valcom, Inc. CMX Corporation

1111 Industry Avenue 35 Van Kirk Drive #11 and 12

Roanoke, VA 24013 Brampton, Ontario L7A 1A5

Phone: [phone] Phone: [phone]

FAX: [phone] FAX: [phone]

AB

AG

RING

INHIBIT

BB

BG

PC

TIP

BATTER Y

FEED

HANDSFREE

CIRCUIT

POW ER
SUPPLY

TO N E
GEN.

TO N E

DECODER

K20

K19

COM PUTER

MEMORY

DETECTOR

K18

K18

K21

MICRO-

&

&

DIAL

PULSE

K17

K16

K16

K17

K15

K14

K1

K2

K21

K10

K12

K1

K5

K6

K9

SPK O U T

SPK CO M

S IG IN 1

STA10

STA 11

STA 28

STA 29

STA 30

STA 31

STA 8

STA 9

S IG IN 2

LAM P
LAM P SU P.

V-136RTHF SIM PLIFIED SCH EM A TIC

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TABLE 1

TROUBLESHOOTING CHART

PROBLEM CORRECTIVE ACTION

No side tone Check “A” Battery connections, polarity, and voltage.

No dial tone Check optio n switch 1. Check “B” battery connections, polarity and voltage.

No lamps Check lamp supply voltage and input. Verify that grounds are common at

power supply.

No audible signal at station dialed Check signal voltage at supply and frame locations. Verify that bells and

buzzers are common at power supply.

Double signaling Check option switch 2.
Continuous signaling -

stations 10-29
stations 30-39,

0, 5-9

Check option switch 3.
Check option switch 4.

Alert tone but no voice page at
station

No volume to speaker Check phone to speaker volume control.

No volume to phone Check speaker to phone volume control.

Hum heard at phone Check wiring to speaker.

No speaker cancel Verify ground present at phone side of at least (2) 10K ohm resistors.

R.F. Interference NOTE: The following solutions are listed in order of priority. Not all steps

Check option switches 3 and 4.

Check * for audio present at tip, ring input BL/W, W/BL pair.
Check * for audio at signaled speaker pair at 66B block.
Check * for audio at input of speaker.

Check wiring to talkback speaker.
Remove all connections to inhibit pin and verify problem.

Possible magnetic interference from power supply - relocate unit 12” - 18”
away.
Check for noisy “A” battery.

may be necessary to eliminate or reduce R.F. Interference.

Use 12 AWG wire from equipment ground to water pipe ground.
Install a .05 MFD Ceramic disc CAPACITOR on the following terminals.
a. Talk battery to talk ground
b. Signal batte ry to signal ground
c. Tip to ring
d. Across each speaker pair
e. From inhibit lead (if used) to ground

NOTE: Do not apply ground directly to inhibit input.

* Use telephone test set

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NOTES:
1 ) IN H IB IT O P T IO N - T O C A N C E L
SPEAKERS, A 10K 1/4W 5%
R E S IS T O R M U S T B E IN
SERIES W ITH EACH ICM
B U T T O N "A " L E A D .

2) PO W ER SUPPLY -A BAT.
V D C F IL T E R E D T A L K
B A T T E R Y . B B A T . -2 4 V D C
L A M P G N D ., A G N D . A N D B
G N D . M U S T B E C O M M O N A T
P O W E R S U P P L Y .

3) FOR BEST RESULTS USE 45
O HM SPEAKERS.

4) FOR BEST RESULTS SET
SPEAKER-TO-PH O NE VO LUM E
A T L O W E S T A C C E P T A B L E
L E V E L .

VOLUM E

CONTROLS

(REAR VIEW )

SPK-TO-PH O NE
PHO N E-TO-SPK

5 ) O P T IO N P R O G R A M M IN G :

OPTIONS

SW

ON OFF

N O D IA L

1

TO N E

2DOUBLESINGLE

BURST BURST

3 H F :

STA 10­STA 29

4 HF: BUZZER :

STA 30­STA 39,
STA 0­STA 9

OFF

1
2
3
4

DIAL
TO N E

BUZZER:
STA 10­STA 29

STA 30­STA 39,
STA 0­STA 9

ON

ICM KEYS

POW ER SUPPLY

ICM KEYS

ICM KEYS (NO TE 1)

PAGE C O NTRO L

BUZZERS

OR

SPEAKERS

AUDIBLE SIG N AL

HF OUT

POW ER SUPPLY

T
R
LB
L
IN H
PC
S10
S11
S12
S13
S14
S15
S16
S17
S18
S19
S20
S21
S22
S23
S24
S25
S26
S27
S28
S29
S30
S31
S32
S33
S34
S35
S36
S37
S38
S39
S0
S5
S6
S7
S8
S9
S1 IN
S2 IN
SPK O
SPK C
AG
AB
BG
BB

ABC DEF

W/BL
BL/W
W/O
O/W
W/GR
GR/W
W/BR
BR/W
W/S
S/W
R/BL
BL/R
R/O
O/R
R/G
G/R
R/BR
BR/R
R/S
S/R
BK/BL
BL/BK
BK/O
O/BK
BK/G
G/BK
BK/BR
BR/BK
BK/S
S/BK
Y/BL
BL/Y
Y/O
O/Y
Y/G
G/Y
Y/BR
BR/Y
Y/S
S/Y
V/BL
BL/V
V/O
O/V
V/G
G/V
V/BR
BR/V
V/S
S/V

R10
R11
R12
R13
R14
R15
R16
R17
R18
R19
R20
R21
R22
R23
R24
R25
R26
R27
R28
R29
R30
R31
R32
R33
R34
R35
R36
R37
R38
R39
R0
R5
R6
R7
R8
R9

BUZZER

OR

SPEAKER

RETURN

CABLE FROM

CONTROL UNIT SPLIT BLOCK

66B350

FIG URE 1: CO NNECTING BLO CK ARRANG EM ENT V-136RTHF

6 947137

POW ER
SUPPLY

LG

LB

AG

-2 4
AB

BG

TELEPH O N E

SETS

T
R
LG
L
A

Note 1

NOTE 1:
C o n n e c t IC M " A " L e a d fro m
each telephone to a 10K resistor.

10K 1/4W 5%

IC M
"A "
LEADS

INHIBIT
(W /G R )

C onnect other end of resistors
to V -136R TH F inhibit lead.

STRAP

M U LT IPLE TO
ALL PHO NES

W/BL
BL/W
W/O
O/W
W/GR
GR/W
W/BR
BR/W
W/S
S/W
R/BL
BL/R
R/O
O/R
R/G
G/R
R/BR
BR/R
R/S
S/R
BK/BL
BL/BK
BK/O
O/BK
BK/G
G/BK
BK/BR
BR/BK
BK/S
S/BK
Y/BL
BL/Y
Y/O
O/Y
Y/G
G/Y
Y/BR
BR/Y
Y/S
S/Y
V/BL
BL/V
V/O
O/V
V/G
G/V
V/BR
BR/V
V/S
S/V

T
R
LB
L
IN H
PC
S10
S11
S12
S13
S14
S15
S16
S17
S18
S19
S20
S21
S22
S23
S24
S25
S26
S27
S28
S29
S30
S31
S32
S33
S34
S35
S36
S37
S38
S39
S0
S5
S6
S7
S8
S9
S 1 IN
S 2 IN
SPK O
SPK C
AG
AB
BG
BB

66B350

SPLIT BLOCK

A

BC D

SPKR AT

EACH

STATIO N

BRID G E

STRAP

E

F

R10
R11
R12
R13
R14
R15
R16
R17
R18
R19
R20
R21
R22
R23
R24
R25
R26
R27
R28
R29
R30
R31
R32
R33
R34
R35
R36
R37
R38
R39
R0
R5
R6

STRAP

R7
R8
R9

-2 4
BB

CABLE FROM

CONTROL UNIT

F IG U R E 2 : C O N N E C T IO N S F O R 3 6 Z O N E H A N D S F R E E T A L K B A C K

7 947137

POW ER
SUPPLY

LG

LB

AG

-2 4
AB

BG

TELEPH O N E

SETS

T
R
LG
L
A

N o te 1

NOTE 1:
C onnect IC M "A" Lead from
each telephone to a 10K resistor.

10K 1/4W 5%

IC M
"A "
LEA D S

C onnect other end of resistors
to V -136R TH F inhibit lead.

AUDIBLE
GROUND

AUDIBLE
SUPPLY

M U LTIP LE TO
ALL PHO N ES

IN H IB IT
(W /G R )

STRAP

W/BL
BL/W
W/O
O/W
W/GR
GR/W
W/BR
BR/W
W/S
S/W
R/BL
BL/R
R/O
O/R
R/G
G/R
R/BR
BR/R
R/S
S/R
BK/BL
BL/BK
BK/O
O/BK
BK/G
G/BK
BK/BR
BR/BK
BK/S
S/BK
Y/BL
BL/Y
Y/O
O/Y
Y/G
G/Y
Y/BR
BR/Y
Y/S
S/Y
V/BL
BL/V
V/O
O/V
V/G
G/V
V/BR
BR/V
V/S
S/V

T
R
LB
L
IN H
PC
S10
S11
S12
S13
S14
S15
S16
S17
S18
S19
S20
S21
S22
S23
S24
S25
S26
S27
S28
S29
S30
S31
S32
S33
S34
S35
S36
S37
S38
S39
S0
S5
S6
S7
S8
S9
S 1 IN
S 2 IN
SPK O
SPK C
AG
AB
BG
BB

66B350

SPLIT BLOCK

A

BC DE

B

B

STRAP

STRAP

BRIDG E

BRIDG E

F

R10
R11
R12
R13
R14
R15
R16
R17
R18
R19
R20
R21
R22
R23
R24
R25
R26
R27
R28
R29
R30
R31
R32
R33
R34
R35
R36
R37
R38
R39
R0
R5
R6

STRAP

R7
R8
R9

-2 4
BB

CABLE FROM

CONTROL UNIT

FIGURE 3: CONNECTIONS FOR 20 ZONE STATIONS OF BELL/
BUZZER AND 16 STATIO NS O F HANDSFREE TALKBACK

8 947137