66251750-EN - V1.0 - 05/06/17
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4000 Series Vandal Resistant Digital GSM - Technical Manual
4000 Series Vandal Resistant Digital GSM Audio Intercom with Proximity
Troubleshooting
SYSTEM CHECKS AND TESTING
The following table can be used to help diagnose any potential issues that may occur during installation and the system checks that
can be carried out to help resolve them.
SYMPTOM
TEST
Interference on the speech.
Check the signal strength
1111SIG?
(if the signal strength is too low the GSM module increases
it’s power to compensate, causing interference with the speech circuits). Try relocating the
antenna or using a more powerful or directional antenna (e.g. high gain antenna).
Ensure the antenna cables are not running close to the power supply cables or the microphone
wires inside the intercom panel.
Try a different SIM card from a different network service provider as they may have better
coverage in that area.
Nothing is shown on the graphical
display and it is not illuminated.
Check the power supply has adequate voltage as described earlier in this manual (refer to
pages 9 and 18).
Try a full reset (refer to page 21)
The digital GSM module may have a fault.
The digital GSM intercom does not
respond to SMS messages.
Check the SIM card has an SMS service centre number stored. This will require putting the
SIM card into a mobile phone to check. Contact the SIM card provider if you are not sure.
Check the number you are sending the message to is correct (the number of the SIM card in
the digital GSM intercom panel).
After sending an SMS message to the digital GSM listen for a single short beep from the
intercom panel. This will indicate that the message was received and understood. If a long
beep is heard it indicates the message was either not understood or the 4 digit master code
was incorrect.
Try resetting the 4 digit master code to 1111 (refer to page 21).
The call keeps dropping out.
Increase the call time
(SPT)
of the digital GSM intercom (refer to the programming flowchart
on page 34 to program via the keypad and page 51 to program by SMS message).
Check the signal strength and if necessary, move or change the antenna or try a different
SIM card provider.
Speech echoes and feeds back.
Try adjusting the mic and speaker volume via the keypad selecting the general settings
menu on the digital GSM intercom (refer to the programming flowchart page 31).
Try adjusting the mic and speaker volume using the programmable settings during a call
(refer to user command table 1 on page 63).
Check the microphone is fitted correctly in the intercom panel and that the mic hole is not
blocked in any way.
ERROR message returned in SMS
when programming or no SMS
returned at all even though a ? was
included at the end of the message
sent.
Check over the message sent again and compare it with the examples in this manual.
Common errors include:
1. Using two apostrophe marks side by side instead of
“
. Note that these look the
same in the message. An easy way to see if this is the problem is to move the cursor
along in the message and if the cursor can get between the two
“
then it is not the
correct character used.
2. Lower case letters instead of upper case. For example using
stn
when
STN
should be used.
