CB Svendsen FA-20, Manual

Page: 20 / 26

20
Fast track service manual for FA-20:
1. Control of electricity supply and internal power supplies:
If 230Vac is connected to the FA-20, then you should (within 3 seconds after power on) be
able to se the 3 LED’s in “traffic light” formation (red, yellow, green) inside the FA-20 light
up just to the right of the middle. These 3 LED’s indicates 3 internal voltages 24V, 3.3V and
12V. All 3 LED should all light up constantly. If this is not the case, you will have to check
that there are 230Vac on the terminals and if this is not the case you have to check the
fuse under plastic lid to the right of the connection terminals. The fuse will blow in case of
lightning and other similar influences – and will in some cases protect the FA-20 against
further damage. If normal function cannot be obtained by change of fuse – then the FA-20
should be taken down and sent to service.
2. Control of the GSM connection:
The little green interior LED to the right of the key is controlled only by the GSM/GPRS
modem and tells about the GSM-modems condition:
1. Always OFF: Power error or hit by a bug.
2. One flash per second: Modem is looking for network
Modem is about to turn off / reboot
Modem has a defect/ no SIM-card
(PIN-code active on the SIM-card?)
3. Always ON: GSM/GPRS communication is ongoing.
4. One flash per 3 sec.: GSM-modem is on the GSM-network and
ready.
If there is no power error like in point 1 and the little green internal LED is turned off, then it
is properly an error in the GSM modem and the FA-20 should be taken down and sent to
service. If the little green internal LED on the other hand flashes once per second, then it is
probably a local problem in form of a lack of GSM coverage, defective antenna or SIM-
card, SIM-card with PIN-code on or missing payment. Try with another tested SIM-card or
a different telephone operator or try a wired antenna instead of whip.
Test the communication by sending the FA-20 a regular text SMS containing NNNN
(NNNN is the default password – can be changed by the main station) from a regular
cellular phone. If the FA-20 receives the SMS the FA-20 will answer with a service SMS,
among others containing measured field strength. The field strength should be between –
50dBm (good signal) and –90dBm (weak signal – but typical still usable). By signal weaker
then –90dBm a different mounting place of FA-20 should be considered.
3. Controlling the FA-20 computers operating mode:
If there is no power error, then you can see the FA-20’s computer operation mode on the
big red and the big green LED at the top to the left (visible through the lid). If the red LED is
constantly on and the green LED is constantly off then there is a permanent error condition
and the FA-20 should be dismantled and sent to service. All other conditions of the green
LED and the red LED is described on page 19 in the installation guide and will normally not
mean a need for service.