6 947476
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 (540) 563-2000 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: (540) 563-2000 FAX: (540) 362-9800
