3
4. NO VOICE ON SYSTEM:
Check volume control
potentiometer(s) on NH209TTA speaker/microphone
(in both directions; up and down). Check speaker/
microphone connections at entry station. Connect a
single handset to system wiring only, to test voice
operation. If voice is working, amplifier and entry
speaker/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
operating voltage of door opener so it matches 12VAC
output from NH209TTA system amplifier. Check wir-
ing (and gauge) to door opener, from amplifier/power
supply. When using a magnetic type lock or other 'fail-
safe' type door strike, or other voltage door strike, you
should use a reversing/specialty relay, such as our model
#PK407A for each entrance door strike or door lock.
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 VH309B PC
board and adjust as needed from approx. 0 to 180
seconds. Calibration is not exact, so please check timing
after re-adjusting.
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. Temporarily switch monitor PC board (VH309B)
with one from a functioning location.
9. VIDEO PICTURE POOR QUALITY:
Make sure
KBS-1 is installed as close to entry camera as possible.
Make sure there is a 100 ohm (model RC0100/4) end-
of-line resistor across terminals 'Y' and 'Z' at the end of
each video/data riser/line.
PLEASE NOTE: It is normal for the KBS-1 unit
to get very warm, when operating. Please take
care not to touch any warm or hot components
with your bare hands! If these checkpoints fail
to indicate the problem, there may be an equip-
ment or wiring fault. Please contact the factory
or a qualified service representative for addi-
tional assistance.
VH30ANC 'NOCOAX' TYPE MONITOR
COMPONENT LISTING
TYPICAL REPLACEMENT PARTS
and COMPONENTS
Model# VCU309:
Power Supply unit. One (1) required
for each 30 (or less) monitors. Requires 1- model
T2440 (24VAC/40VA) plug-in transformer.
Model# VBV-4:
Four (4) output Video Distributor. One
(1) required for each four (4) (or less) video data
outputs to monitor risers/lines. Requires 1- model
NG20 (15VDC) DC power supply unit for each
VBV-4.
Model# NH209TTA:
Entry Speaker/Microphoneunit.
One (1) required for the building entry. Requires 1-
model T1240 (12VAC/40VA) plug-in transformer.
Model# KBS-1:
Coaxial to digital video converter.
Converts standard NTSC format coaxial video signal
to data, to send on conventional wiring. Requires 1-
model NGC20 (15VDC) DC power supply unit.
NOTE:
on STR™ type video door stations the cam-
era is also powered by this same NGC20 power
supply on terminal 'B' and 'O' (+ and - respectively).
On other types of video door stations, the cameras are
provided with a separate camera power supply (see
page 8).
Not
Used*
* This button is used on other systems and does not apply to
this multi-resident type configuration.
Contrast
Brightness
Vertical Hold
