6
Installation:
___ 1. Disconnect power from V-9937.
___ 2. Plug V-9942, Tone Module, into jack
provided in V-9937.
___ 3. Warble Tone
___ a. Connect pin 11 of V-9937 to one side of
dry contact closure being used to control
the warble tone.
___ b. Connect pin 26 to the other side of the
closure.
___ 4. Single Tone
___ a. Connect pin 12 of the V-9937 to one side
of dry contact closure being used to
control the single tone.
___ b. Connect pin 27 to the other side of the
closure.
___ 5. Referring to Figure 4, set the volume
control on the V-9942 to approximately
1/2.
___ 6. Set the tone select switches (Figure 4) to
determine which outputs will receive tones
(OFF: No tones; ON: Tones).
___ 7. Reapply power to the unit.
___ 8. Testing the Tones
___ a. IMPORTANT: Verify volume controls
have been adjusted.
___ b. Momentarily connect between pins 11 and
26 of the V-9937. A warble tone should
be heard from any speakers connected to
outputs that have the tone select switch
set ON.
___ c. Momentarily connect between pins 12 and
27. A single frequency tone should be
heard from any speakers connected to
outputs that have the tone select switch
on.
___ d. If proper results are not obtained in (b)
and (c), then remove power from the V-
9937; return to the beginning of this
Section and verify all connections.
___ 9. While shorting pins 12 and 27, adjust the
V-9942 volume control to the desired
level.
OPERATION
Circuit Description
The V-9937, One Zone Page Port Adapter, will
interface to most E-KEY or PABX page ports to
provide a single zone of one-way paging with
automatic gain control, pop suppression and
background music cut off. The V-9937 has 3
inputs:
Input 1:
provides talk battery and contains loop
detection circuitry. It is to be accessed from a C.
O. line button on E-Key Systems or a loop trunk
port on PABX's. Signals on this input will go
through the AGC and pop suppression circuits.
Accessing this port will override inputs 2 and 3.
Input 2:
is transformer coupled to the V-9937.
Ground must be applied to pin 3 for this input to
operate (provided from pin 18 through the
telephone system contact closure). When ground
is applied to pin 3, input 3 will be overridden.
Audio on this input will go through the AGC and
pop suppression circuits. Typically this input will
connect to an 8 or 600 Ohm page port.
Input 3:
is transformer coupled to the V-9937 and
is active any time inputs 1 and 2 are not in use.
This input is not affected by AGC or pop
suppression and is typically used as a music input.
The output of the V-9937 is designed to drive
Valcom One-Way Amplified Speaker Assemblies.
Two outputs are provided. Output 1 provides
paging and background music with automatic
music cutoff during a page. Output 2 provides
paging without music for areas where music is not
desired.
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 your problem is listed,
perform the actions indicated. A lineman's test
set, several clip leads, and a VOM may be
necessary to effectively troubleshoot the unit.
If the trouble can not be located, continue to
troubleshoot by substituting a spare unit for the
suspected unit.
Assistance in troubleshooting is available from the
factory. When calling, you should have a VOM
and a test set available and call from the job site.
Call (540) 563-2000 press 1 for Technical 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 your 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
