Alpha Communications VH30AK Installation And Use Instructions Manual - Page 3
Browse online or download pdf Installation And Use Instructions Manual for Intercom System Alpha Communications VH30AK. Alpha Communications VH30AK 8 pages. Video intercom system
Print Pagethe camera to the monitor. Starting at camera, check for
video signal through coax cable, and through (VDU-4)
video distributors (if used). Check for approx. 12VDC
power at each VDU-4 video distributor (if used). Check
coax connector at camera(s) to make sure it is not
shorted or open. Temporarily switch monitor PC board
(VH250P) with one from a functioning location.
4. NO VOICE ON SYSTEM: Check volume control
potentiometer on VCU6 amplifier (in both directions; up
and down). Check terminals 'T', 'O', and 'M' to handsets.
Check speaker/microphone connections at each entry
station. Disconnect terminals 'T', 'O' and 'M' on VCU6
system amplifier, and connect a single handset to those
terminals.Ifvoiceisworking,amplifierandentryspeaker/
microphone are O.K., so check riser wiring. If not
amplifier or speaker/microphone could be faulty. Check
by replacement.
5. UNABLE TO RELEASE DOOR STRIKE: Check
wiring to handset terminals '1' and 'O'. Temporarily
remove door opener wire from terminal '1' and touch to
terminal 'O'. Check operating voltage of door opener
matches output from system amplifier. Check wiring
(and gauge) to door opener, from amplifier/power sup-
ply. When using a magnetic type lock or other 'fail-safe'
type door lock, you should use a reversing relay, such as
our model# PK407A for each entrance.
6. HUM OR BUZZ: Check system wiring installed too
close to power wiring or electrical devices or transform-
ers; check transformer(s) installed too close to control
equipment (should be at least three (3) feet away).
Wiring is being run next to wiring for other systems and/
or devices.
7. MONITORS TIMING OUT TOO QUICKLY:
Check adjusting control potentiometer on VH250P PC
board and adjust as needed from approx. 0 to 180
seconds. Calibration is not exact, so please check timing
after re-adjusting. If that doesn't correct the problem,
check this out; On the VCU6 amplifier/power supply,
there are three (3) sets of (+) and (-) terminals for the
Monitors, marked M1+, M1-, M2+, M2-, M3+, M3-.
The negative (-) terminals are already jumped together
inside the VCU6. Jump the three (3) positive (+)
terminals together, as shown on diagrams.
8. MONITORS DO NOT TIME OUT AT ALL:
Check for shorts and/or grounds on system. Tempo-
rarily switch monitor with one from a functioning loca-
tion. Check that entry station pushbutton is not stuck or
shorted.TemporarilyswitchmonitorPCboard(VH250P)
with one from a functioning location.
PLEASE NOTE: If these checkpoints fail to indicate the
problem, there may be an equipment or wiring fault. Please
contact the factory or a qualified service representative.
VH30AK MONITOR COMPONENT LISTING
Contrast
Brightness
Vertical Hold
* This button is used on other systems and does not apply to
this multi-resident type configuration.
TYPICAL REPLACEMENT PARTS
Model# VCU6: Amplifier/Power Supply unit. One (1)
required for each 30 (or less) monitors.
Model# VDU-4: Four (4) output Video Distributor. One
(1) required for each four (4) (or less) video outputs to
monitor risers/lines.
Model# TU1007A: Multiple Entrance audio switching
adaptor. Used to switch the voice (and door release) to
the calling entrance. One (1) required for 2 entrances,
two (2) required for 3-4 entrances, three (3) required for
5-6 entrances, and four (4) required for 7-8 entrances.
Used on systems with more than one (1) entrance
station.
Model# DPS-2 (TUV2): Multiple Entrance video switch-
ing adaptor. Used (in addition to the TU1007A) to switch
the video to the calling entrance. One (1) required for 2
entrances, two (2) required for 3-4 entrances, three (3)
required for 5-6 entrances, and four (4) required for 7-
8 entrances. Used on systems with more than one (1)
entrance station, where video switching is required.
3
Not
Used*