Sur-Gard SG-DV4420, Manual

Page: 15 / 23

15
PROBLEM, SYMPTOMS
Questions to ask yourself when doing
troubleshooting:
n
New installation?
n
Existing installation that was working?
n
Communication failed under what
circumstances? (during power failure,
after work done on building or system)
n
Intermittent problem?
SOLUTION, ACTION
1. Verify the Tx and Rx led indicators on the panel:
RX: Should flash with polling at fairly steady rate.
If inactive, check that the panel is otherwise
functioning, check the watch dog led, and items
2 through 4 below, then contact the telephone
company to be sure that leg is “ON”.
TX: Flashes each time panel answers polling, longer
burst for alarms, restores, openings, closings,
etc... The Interval between flashes depends on
the number of subscribers polled. When an alarm
triggered, check if there is only one transmission
(burst). Often needing two or more attempts to
communicate is a sign of network problems.
2. Verify 24V
DC
supply to the F1/F2 modem subset. It should
be between 24 and 26VDC. If more than one panel is
connected to the same modem, negatives of the panel 24
volts modem power supplies must be connected together.
3. Verify the connections between the panel and the F1/F2
subset. Check the cable, the jacks, 24VDC power and
serial connections if more than 1 control is connected to
the same F1/F2 subset. Try your spare modular cable.
NOTE: If the cable length to the subset is longer
than 50 feet, you must use low capacitance shielded
cable for the serial connections and extra, heavy
gauge wires for the 24V
DC
.
4. Verify the options settings on the F1/F2 subset. (don’t
change them - just look and advise the telephone
company of any discrepancies!) There are 3 dip switch
units of 6 switches each inside, behind the magnetically
attached faceplate. #1 is adjusted by the telephone
company for levels. On #2, switches 2, 3, 5, 7, and 8
must be in the “ON” position. FOR #3, all switches must
be “OFF”.
5. Test the operation of the panel with a SG-DVT1 tester. If
working correctly, switch modes on the SG-DVT1 and test
communication through the F1/F2 subset and panel’s
modular cable.
TROUBLE SHOOTING