Simplex 4010 Service Manual page 19

Power Supply Troubles,
Type
Positive Earth Ground
(Fault condition between
Power
Supply
Negative Earth Ground
Points
(Fault condition between 0V
Expansion Power Supply
Power
Supply
Points
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Continued
Table 2-2. Power Supply Troubles (continued)
Trouble Message
+24 V and Earth)
and Earth)
Battery
Possible Causes / Troubleshooting
Run the Earth Fault search diagnostic. If the results of the Earth Fault
search do not isolate the source of the fault, try the following:
• Disable each NAC one at a time, checking each time to see if the
fault clears.
•
Disconnect the AUX power from the panel. Check to see if the fault
clears.
•
Disconnect the N2 communications from the panel. Check to see if
the fault clears.
If the fault is intermittent, use the Earth Fault Latch, located in the
Function menu, to silence the fault until the intermittent problem can be
isolated and fixed. Note: After fixing the problem, you will need to
perform a system reset to clear the Earth Fault Latch.
If a negative ground is isolated to the dual RS-232 card and one port of
this card attaches to a DC-powered printer and the other port connects
to an AC-powered CRT, upgrade 565-810 to Revision A1 or greater.
You can also remove jumpers P17 and P18 from this card, if ground
detection is not required.
Check the connection of the wires running from the battery to the
expansion power supply, as shown in the illustration below.
- +
2 1
2-5
+ - +
RED BLACK
BLACK
RED
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