Trouble Shooting - Alcad GRF-400 Manual Del Usuario

TROUBLE SHOOTING

Nothing works.
Check the mains voltage in the power supply unit. Check that the
voltage between + and – of the power supply is 17 ±10% Vdc.
Check for the existence of a short circuit and rectify this. Disconnect
the power supply for 1 minute and then reconnect it. If ithe
breakdown continues, disconnect all the power supply + and –
terminals, and check that the voltage between + and – is 21 ±10%
Vdc. If you cannot find the fault, there may be something wrong
with the power supply.
The card holders do not light up.
Check that the voltage between + and – of the power supply that
supplies the audio unit is 17 ±10% Vdc. Check whether the lamp
is burnt out.
You cannot hear any sound on the entrance panel when a call
is made.
Check the connections between the audio unit and the push-
buttons. If you cannot find the fault, there may be something wrong
with the audio unit.
When a call is made, the monitors/telephones ring but
confirmation of the call cannot be heard on the entrance panel.
Check the volume control of the entrance panel audio unit. If you
cannot find the fault, there may be something wrong with the
audio unit.
If it is not possible to call
Check that only one entrance panel has been defined as the main
one. Check wether there is a short-circuit in the connections D1,
D2 from the audio unit to all the devices. If required, check
connections D3, D2 of the equipment in the installation. If you
cannot find the fault, there may be something wrong with the
audio unit.
D I G I TA L V I D E O D O O R E N T R Y S Y S T E M S
If intermittent tones can be heard on the entrance panel when
a call is made.
No monitor/telephone can be heard from the entrance panel.
One monitor/telephone cannot be heard from the entrance
panel.
You cannot hear the entrance panel on any monitor/telephone.
You cannot hear the entrance panel on a monitor/telephone.
The call tone cannot be heard on the telephone: Check that the
handset is not off the hook. Check that the programming switch
of the connection bracket/telephone is in ON position. Check
connections D1 and D2 from the audio unit to all the connection
brackets/telephones. If required, check connections D3, D2 of the
equipment in the installation. If you cannot find the fault, the
telephone, the audio unit or some other equipment in the installation
may have broken down.
Check the volume control on the panel. If you cannot find the fault,
there may be something wrong with the audio unit.
Check the cable connections between the receiver ande the base
of monitor/telephone. Check the hanging-up button on the base
of the monitor/telephone. If you cannot find the fault, there may
be something wrong with the monitor/telephone.
Check the volume control on the monitors/telephones (on the
panel). If you cannot find the fault, there may be something wrong
with the audio unit.
Check the cable connections between the receiver ande the base
of monitor/telephone. Check the hanging-up button on the base
of the monitor/telephone. If you cannot find the fault, there may
be something wrong with the monitor/telephone.