Videx SENTRY Bedienungsanleitung PDF herunterladen (Seite 30)

PAGE 28 of 29 SENTRY TECHNICAL MANUAL VER1.6

TROUBLE SHOOTING

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 (Floor by floor), testing after

each set to see if the fault has re-appeared.

SYMPTOM TEST

No speech from door panel

Check terminal 2 on the amplifier for continuity back

to the sentry PCB

Check terminal 2 on the handset for continuity back

to the sentry PCB

During a call but before lifting the handset, check the

voltage to the telephone on terminal 2 is 12Vdc.

Trace this voltage from amplifier terminal 2 to the

telephone.

Check the voltage drops to approx. 1Vdc during a

call after the handset is lifted. (If not try another

telephone)

If all else fails try another amplifier at the door station

No speech from handset

Check terminal 1 on the amplifier for continuity back

to the sentry PCB

Check terminal 1 on the handset for continuity back

to the sentry PCB

During a call but before lifting the handset, check the

voltage to the telephone on terminal 1 is 12Vdc.

Trace this voltage from amplifier terminal 1 to the

telephone.

Check the voltage drops to approx. 4Vdc during a

call after the handset is lifted. (If not try another

telephone)

If all else fails try another amplifier at the door station

Handset beeps only once when called

Check the voltage across 3&4 on the door panel

amplifier. During a call this should be 12Vdc

(Supplied from the Sentry PCB)

Handset only rings for 1 second

Check terminal 1 going to the handset for continutity

back to terminal 1 on the door station via the Sentry

PCB.

Phone does not stop ring when handset is

lifted.

Check terminal 2 on handset for continuity back to

the Sentry PCB.

Lock will not operate from telephone

Check terminal P on the telephone for continuity

back to the Sentry PCB.

Check the voltage on terminal 5 of the handset. 5Vdc

in standby dropping to 0V when the release button is

pressed during a call.

Lock operates as soon as the handset is

lifted.

Check for shorts across terminal 5 of the telephones

and other cables.

Check terminal 5 voltage. Should be 5Vdc when the

button is not being pressed (5V is generated by the

Sentry PCB).

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