Scantronic 808 Manuale di Installazione Scaricare il pdf (Pagina 32)

32

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Symptom Possible Causes Possible Solution

The ARC is

reporting the

receipt of a

channel 14

alarm.

This is an internal

alarm generated by

the STU to indicate a

battery low condition.

Possible mains failure or faulty battery.

No activity on

the STU, no

LEDs on.

The power is off.

Check for 12V dc at TB3 V+

with respect to TB3 0V

Regular ‘chirps’

are heard (every

2½ to 3 minutes)

whenever the

telephone is in

use.

The NVM has been

programmed for

Private Wire mode

and the STU is

connected to a

normal phone line

(PSTN).

Re-program the NVM for ‘PSTN mode’.

Calls cannot be

made from the

STU phone line.

a) LK1 fitted when

STU is connected to

the PSTN.

b) Incorrect phone

line wiring to the

STU.

c) Faulty wiring at the

redcare block

terminal.

d) Faulty phone line.

a) Remove LK1.

b) Check and correct the wiring.

c) Seek assistance from the ARC.

d) Report the fault to your local BT fault

repair service.

The ARC is

reporting the

receipt of a

channel 15

alarm.

This is an internal

alarm generated by

the STU to indicate a

self test failure.

The STU has detected a fault in its

internal circuitry. Replace the STU.

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