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Revision B • 1/03
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4-5
4 Maintenance
POWER SUPPLY
Periodically check that the vent openings on the
power supply chassis are not blocked and that
there is no dust buildup on the vent openings.
Caution:
To reduce the risk of elec-
tric shock, do not open the power
supply. Refer servicing to qualified
service personnel only.
Power Supply Connections
The power supply cable has two connectors:
• The 5-pin connector supplies DC power to
the console.
• The 4-pin connector supplies an Imminent
power shutdown warning to the console.
Both connectors must be attached to the back
of the Legacy and to the power supply. See page
2-4 for additional information about the power
supply connections.
5-pin Connector
Pin Signal
Wire Color
1
+48V
Red
2
+48V
Yellow
3
Shield
Clear
4
+48V Return
Black
5
+48V Return
Blue with Black Stripe
4-pin Connector
Pin Signal
Wire Color
1
Power Supp 1 Collect
Orange
2
Power Supp 1 Emit
Brown
3
Power Supp 2 Collect
Blue
4
Power Supp 2 Emit
Red with Black Stripe
5 4 3 2 1
4 3 2 1
CLOCK AND EVENT TIMER
The Clock and Event Timer assemblies are
mounted in the meter panel.
Clock Troubleshooting
If the clock is not working properly, check that
the supply cable leading to the assembly is installed
correctly. Also check the DIP switches that con-
trol the clock’s operating mode. The clock’s DIP
switches are at the edge of the clock circuit board.
For more information about the clock circuit board
switches and settings, see page 2-5.
Event Timer Troubleshooting
If the Event Timer is not working properly,
check that the cable leading to the assembly is
installed correctly. It plugs into the Meter Switcher
module.
If the tenths of seconds display is not function-
ing as expected, check the DIP switch on the Event
Timer circuit board. For more information about
the Event Timer, see page 2-6.
If the Event Timer is not automatically reset-
ting as expected, check the input modules’ DIP
switches to make sure the Timer Reset switch is
set correctly. For more information about setting
the input module DIP switches, see page 2-19.
BACKUP BATTERIES
A “Keep Alive” voltage is generated by three AA
nickel cadmium (NiCad) batteries (PRE 50-7),
supplied in the tool kit. These batteries supply a
voltage that holds each module’s logic state dur-
ing momentary power outages. This ensures that
the console powers back up in the same state it
was in when power was lost.
These batteries should be replaced yearly to
ensure continuous backup protection. Additional
battery information is given on pages 2-4 & 2-5.
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