Valcom V-9939C User manual

Issue 1
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V-9939C
MICROPHONE ADAPTER
INTRODUCTION
These instructions provide identification,
installation, connection, operation and
maintenance information for the V-9939C
Microphone Adapter.
The V-9939C is a Microphone Adapter designed
to be used with Valcom paging equipment.
SPECIFICATIONS
Purpose
Provides microphone access to Valcom
one-way amplified speaker assemblies.
Applications
Allows local paging access to a zone of
one-way paging speakers
Allows paging access to stand alone
systems
Refer to Figure 1 for a block diagram of a typical
installation.
Features
Works with most microphones with push to
talk switches
Built in microphone preamplifier
Mounts at microphone location
Provides a set of form "C" contacts
May be connected to a selected zone of a
multi- zone paging system
Connector terminals for all connections
Capacity
Each V-9939C may be connected to one zone of
a paging system.
Dimensions/Weight
8.25" H x 4.50" W x 2.35" D
(20.95cm H x 11.43cm W x 5.97cm D)
0.7lbs. (0.32kg)
Power Requirements
-21.5 to -26VDC filtered "A" Battery, 40mA max.
Environment
Temperature: 0 to 50°C
Humidity: 0 to 85% non-precipitating
Nominal Specifications
Input impedance: Low Z or Hi Z
Output impedance: 600 Ohms
Output level: -10dBm nominal

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SYSTEM DESIGN
Configuration
There are two basic ways the V-9939C
Microphone Adapter may be used:
1. It may be used with a V-1094A and
Valcom one-way amplified speaker
assemblies as a stand alone paging
system.
When using the V-9939C for access to a stand
alone paging system, the following will be
required:
1 V-9939C Microphone Adapter
1-Microphone (push to talk)
1 V-1094A Booster Control
Valcom one-way amplified speaker
assemblies (type determined by job
requirements)
Power Supply (type determined by style and
quantity of speakers - Consult the Valcom
One-Way Paging VSP for more information)
2. By using the V-9939C with a V-2001A
One Zone Page Control you may
automatically disconnect the speakers of
one zone from a multi-zone page
adapter and allow microphone access to
that zone. These configurations will
allow the microphone to override the
telephone access.
NOTE: These will work only on a zone of
ONE-WAY paging.
When using the V-9939C to override an existing
zone of telephone accessed one-way paging, the
following will be required:
1 V-9939C Microphone Adapter
1-Microphone (push to talk)
1 V-2001A One Zone Page Control
OR
An existing Valcom one-way page system
Other configurations are possible. Contact
Technical Support [phone] with
questions on specific applications.
Microphone Requirements
A standard high impedance (50,000 Ohms) or
low impedance balanced (600 Ohms)
microphone may be used. The microphone will
be required to provide a dry contact closure
(push to talk) for page access.
See Figure 3 for connections to Valcom
V-400/450 or V-420 Microphones.
INSTALLATION
These instructions cover the installation
procedures for the Valcom V-9939C and any
associated Valcom equipment. Please consult
practices for other manufacturer's equipment if
any other equipment is being used. Refer to
Figure 2 for location of connections and
designations.
The following sections contain step-by-step
instructions for wiring the V-9939C and
associated Valcom equipment. Place a check
on the appropriate line as the instruction is
completed. The instructions also include tests
along the way to verify connections have been
made correctly. If these steps are followed
exactly, installation of your Valcom system will
go smoothly and quickly. If the results of a test
do not correspond with what is shown, DO NOT
PROCEED UNTIL THE PROBLEM HAS BEEN
CORRECTED.
NOTE: During initial system setup it is
recommended that all volume controls be set
1/2 turn clockwise.
Mounting
Using two #6 ¾ inch wood screws, mount
the unit in a convenient location near the
microphone location
NOTE: DO NOT locate the V-9939C closer
than 18 inches to a power supply or any
equipment that generates electrical noise.
V-9939C V-1094A
Amplified Speaker
s
Power
Supply
FIGURE 1 – BLOCK DIAGRAM OF A TYPICAL INSTALLATION

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V-9939C
SWITCH POWER (+) POWER (-) MIC SHIELD LO Z2 GND OUT LO Z1 HI Z
R8
Control
Volume
RING
STATIONARY BREAK MAKE
TIP
} 24 VDC
Power Connections
___ 1. Unplug power supply.
___ 2. Connect -24VDC "A" battery (may be
referred to as "-" or "talk battery") from
power supply to one of the PWR
terminals on the V-9939C.
___3. Connect -24VDC Ground ("A" ground,
"+" or "talk" ground) from power supply
to the other power terminal. This GND
should be properly grounded to an earth
ground to alleviate hum on the system.
Connecting Arrangements
NOTE: Place a check by the Arrangement
being used and proceed to the Figure
indicated for step-by-step instructions.
___1. Stand alone page system: Proceed to
Figure 3.
___2. Override an individual zone using a
V-2001A: Proceed to Figure 4.
Figure 2 - Location and Connection
Designations
WIRING INSTRUCTIONS (For Figure 3)
Place a check by each step as it is completed:
___1. Mount the V-1094A near the V-9939C or
at the main frame.
___2. Connect Tip of the V-9939C to Tip of the
V-1094A input.
___3. Connect Ring of the V-9939C to Ring of
the V-1094A input.
___4. Connect Tip of the V-1094A output to
the Tip side of all the one-way amplified
speaker assemblies.
___5. Connect Ring of the V-1094A output to
the Ring side of all the speakers.
___6. Connect the microphone:
___a. Connect the audio common lead
shield from the microphone to the MC
terminal of the V-9939C.
___b. Connect the other microphone audio
lead to HZ if using a high impedance
microphone; if using a low impedance
balanced microphone, connect (+)
lead to LZ1 and the (-) lead to LZ2.
___c. Connect one side of the microphone
push to talk switch to the V-9939C SW
terminal.
___d. Connect the other side of the push to
talk switch to the GND OUT terminal.
___7. Connect -24VDC from the power supply
to the -24VDC terminal of the V-1094A.
___8. Connect Ground (+) of the power supply
to the Ground terminal of the V-1094A.
___9. Connect -24VDC from the power supply
to the -24VDC terminal (or the white
lead) of each speaker assembly.
___10. Connect Ground of the power supply to
the Ground terminal (or the black lead)
of each speaker assembly.
___11. Plug in the power supply.
___12. Volume adjustment:
___ a. Set the V-1094A volume control to 5.
___ b. Verify all speaker controls are set at
1/2.
___ c. Speak through the microphone and
adjust the V-1094A for the proper
system level.
___ d. Speak through the microphone and
adjust the individual speakers to the
required levels.

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BREAK
VALCOM
MICROPHONEADAPTER
MICROPHONEADAPTER
VALCOM
BREAK
V-420
MICROPHONE
SHIELDED
CABLE
*
WHITE (+)
BLACK(-)
SHIELD
GREEN
RED
POWER (-24VDC) HI Z LO Z1 POWER (GND) MIC SHIELD LO Z2 SWITCH GND OUT
STATIONARY
V-9939C
V-400
and
V-450
MICROPHONE
CABLE
SHIELDED
*
GND OUT MIC SHIELD POWER (GND) POWER (-24VDC)
STATIONARY
BLACK(-)
WHITE
GREEN
SHIELD
RED(+)
HI Z LO Z1 LO Z2 SWITCH
V-9939C
(+)
(-)
MAKE
TIP RING
-24 +
V-1094A
OUTPUT
INPUT
VP-624D
MAKE
TIP RING
(-)
(+)
-24 +
OUTPUT
V-1094A
INPUT
VP-624D
*NOTE: V-400/450 and V-420 Microphones are wired differently. See correct diagram above.
FIGURE 3 – STAND ALONE PAGE SYSTEM

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SWITCH
MICROPHONE ADAPTER
V-9939C
VALCOM
Microphone
GND OUT HI Z LO Z2 MIC SHIELD LO Z1 POWER POWER
SHIELD
SHIELDED
CABLE
V-400/450
GREEN
WHITE
BLACK (-)
RED (+)
TIP RING
MAKE BREAK STATIONARY
MUSIC
-24VDC
MUSIC
PAGE +
-24VDC
PPCC
GND
GND
CABLE
CAT 3/5
R40
CLOSURE
MUSIC
PAGE W/O
PAGE +
RING
UNA
-24VDC
PC
GND
PAGE RING
TONES
CLOSURE
MUSIC
PAGE TIP
SW4
SW2
UNA
CLOCK
V-2001A
FEED
BATTERY
OFF
R2
MUSIC
SW1 ON
RING
AND
OVR
TIP
PAGE
RING
TIP
AND
FIGURE 4 – OVERRIDE A SINGLE ZONE WITH A V-2001A
WIRING INSTRUCTIONS (For Figure 4)
Place a check by each step as it is completed:
___ 1. IMPORTANT: Complete installation and
testing of your page control unit and
speakers before adding the microphone
adapter.
___ 2. Mount the V-2001A near the microphone
adapter.
___ 3. Connect Tip of the V-9939C to PAGE
TIP.
___ 4. Connect Ring of the V-9939C to PAGE
RING.
___ 5. Connect the GND of the V-2001A to
terminal STATIONARY on the
microphone.
___ 6. Connect the PPCC of the V-2001A to
terminal MAKE of the microphone
adapter.
___ 7. Disconnect Tip of the audio pair to the
speakers on the zone being overridden
from the Page Control unit and connect
it to the PAGE + MUSIC of the V-2001A.
___ 8. Disconnect Ring of the audio pair to the
speakers from the Page Control unit and
connect it to the PAGE + MUSIC of the
V-2001A.
____9. Connect the MUSIC INPUT of the
V-2001A to one side of the output pair
from the page control unit for the zone
to be overridden.
___10. Connect the MUSIC INPUT of the
V-2001A to the other side of the output
pair from the page unit for the zone
being used.
___11. Connect the microphone:
___a. Connect the audio common lead
shield of the microphone to the MC
terminal of the V-9939C.
___b. Connect the other microphone audio
lead to HZ if using high impedance
microphone; if using a low impedance
balanced microphone, connect (+)
lead to LZ1 and the (-) lead to LZ2.
___c. Connect one side of the microphone
push to talk switch to the V-9939C SW
terminal.
___d. Connect the other side of the push to
talk switch to the GND OUT terminal.
___12. Connect -24VDC filtered talk battery
from the V-2001A to the power of the
V-9939C.
___13. Connect Ground (+) of the V-2001A to
the power of the V-9939C.
___14. Volume adjustment:
___a. Speak through the microphone and
adjust the V-9939C volume control
adjustment for the proper page level.

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OPERATION
Circuit Description
The V-9939C Microphone Adapter input is for
both high impedance and balanced low
impedance microphones. It also has input for a
push to talk contact closure. When the closure is
applied, a high gain pre-amplifier is turned on
and the output relay is activated. The unit will
stay active until the contact closure is removed.
TECHNICAL ASSISTANCE
When trouble is reported, verify that power is
being supplied to the unit and there are no
broken connections. Check voltages for proper
polarity on the cross connect block.
Table 1 identifies symptoms of some possible
problems with solutions. If a spare unit is
available, continue to troubleshoot by
substituting the spare unit for the suspected
defective unit.
Assistance in troubleshooting is available from
the factory. When calling, you should have a
VOM, a test set available and call from the job
site. Call [phone] and press 1 for
Technical Support or visit our website at
http://www.valcom.com.
The V-9939C is not field repairable. Valcom
equipment contains no user serviceable
parts inside. Valcom, Inc. maintains service
facilities in Roanoke, VA. Should repairs be
necessary, attach a tag to the unit clearly stating
your company name, address, phone number
and 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
TABLE 1 - TROUBLESHOOTING CHART
SYMPTOM
1. No relay operation in V-9939C
when microphone talk button is
pressed.
2. Relay operation but no output.
3. Audio from V-9939C but not from
V-1094A.
4. No output from V-2001A.
5. Output from V-9939C and
V-1094A or V-2001A but not
from speakers.
SOLUTION
Check for -24VDC at V-9939C across the PWR terminals. Verify
connection from microphone to terminals SW and GND OUT (refer to the
Installation section).
Verify connections from microphone to MC and HZ or LZ terminals. Turn
volume control up (clockwise).
Verify Tip and Ring connections from V-9939C to V-1094A. Verify proper
voltage and polarity at -24VDC and GND terminals of V-1094A. Turn up
volume at V-1094A.
Recheck all connections per Figure 4. Make sure the V-2001A passes the
power test in Figure 4, step 16.
Verify proper voltage and polarity to speakers. Verify audio connections to
speakers. Verify speakers are Valcom one-way amplified speaker
assemblies.
VALCOM LIMITED WARRANTY
Valcom, Inc. warrants its products only to the original purchaser, for its own use, to be free from defects in materials and workmanship under conditions of
normal use and service for a period of one year from the date of shipment. This Limited Warranty obligation 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 physically 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 Limited Warranty is in lieu of and excludes all other warranties, expressed or implied and in no event shall Valcom, Inc. be liable for any
anticipated profits, consequential damages, loss of time or other losses incurred by the buyer in connection with the purchase, operation,
maintenance, installation, removal or use of the product. The maximum liability of Valcom under this warranty is limited to the purchase price of the
specific Product covered by the warranty.
Disclaimer. Except for the Limited Warranty provided herein, the product is provided “as-is” without any warranty of any kind whatsoever including, without
limitation, any WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.
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:
Valcom, Inc.
5614 Hollins Road Roanoke, VA 24019-5056
Phone: [phone] FAX: [phone]