TROUBLE SHOOTING GUIDE
When trouble shooting a large system, it will be easier to break the system
down to a manageable size. The simplest way to do this is to remove all but
one handset. Doing this, you can confirm the door panel and control cabinet
are free from faults. Once this has been confirmed you can reconnect the
handsets in small sets, testing after each set to see if the fault has
re-appeared.
No speech from door panel : Check terminal 2 on the amplifier for continuity back to the
sentry 1 PCB. Check terminal 2 on the handset for continuity back to the sentry 1 PCB.
During a call but before the handset is lifted, terminal 2 should have a voltage of
approximately 12Vdc. Once th handset is lifted, this voltage should drop to approximately
1Vdc. During standby with no call on the system, terminal 2 should not have a voltage
present.
No speech from handset :
Check terminal 1 on the amplifier for continuity back to the sentry
1 PCB. Check terminal 1 on the handset for continuity back to the sentry 1 PCB. During a call
but before the handset is lifted, terminal 1 should have a voltage of approximately 12Vdc.
Once th handset is lifted, this voltage should drop to approximately 4Vdc. During standby
with no call on the system, terminal 1 should not have a voltage present.
Handset bleeps only once :
Check the voltage across terminals 3 & 4 on the door amplifier.
This voltage will be 12V DC when a call is activated. This voltage should stay the same
throughout the call and return to zero volts once the call ends.
Handset rings for only 1 second :
Check terminal 1 of the amp for continuity back to the
sentry 1 PCB. Check terminal 1 of the handset for continuity back to the sentry 1 PCB.
Phone does not stop ringing when handset is lifted :
Check terminal 2 on handset for
continuity back to the sentry 1 PCB.
Lock will not operate :
Check the relay is activating on the sentry 1 PCB (If it is not, check
terminal 5 on the handset for continuity back to the sentry PCB). Check the voltage across
the release when the relay is activated). Terminal 5(P) on the handsets should have 5Vdc on
at all times except when the lock release button is pressed (during a call to that handset).
Lock operates as soon as the handset is lifted :
There is a short between terminals 5(P)
and 2 on the handset cables or 5(P) is shorted to ground (Check for 5Vdc on 5(P), this
voltage originates at the Sentry 1 PCB).
When any button is pressed nothing happens :
Check the CB connection on the sentry 1
PCB (The voltage on this terminal should be +12V DC). Also check this at the door panel.
The CB voltage should be there when the system is in standby but may not be there during a
call depending on the position of JPR1.
No call tone to the handset (speech and lock ok) :
Check terminal 4(T) on the handset for
continuity back to the sentry 1 PCB. Check Fuse 2 on the Sentry 1 PCB
Hum on the speech lines :
Check the intercom cables are not running close to any high
voltage or mains cables.
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