7-8 DIAGNOSTICS
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Help Code
or Error
Message
Description
Possible Causes
and Corrective
Action
HLP 8
RS-232 Interface Serial
Common Error. - High cur-
rent
fl
owing in the ground
connection of the serial
interface between the unit
and the PC. Shows up
only in remote RS-232 op-
eration. Display says HLP
8 for 5 seconds.
Informational display only. No ac-
tion taken on unit operation. Unit
recovers from error condition if
the problem goes away.
Make sure all of the equipment
has adequate grounding.
Hot
Thermal Overload – In-
ternal temperature in the
power supply is too hot.
Power supply is in STAND-
BY.
Leave the power supply turned
on until the Hot message is
cleared.
Make sure there is no blockage of
the vents on the rear panel.
Ambient temperature is too high.
Reduce ambient temperature
below 40°C.
Not Rdy
Not Ready. – Filament
Power Supply is in
STANDBY.
Insuf
fi
cient line voltage. Message
will clear itself when the Auto
Controller receives suf
fi
cient line
voltage.
7.3 Discharge Power Supply
The Discharge Power Supply front panel displays have the additional function
of displaying help codes and error messages. If it becomes necessary to dis-
play a help code or an error message, the Discharge Power Supply may switch
to standby mode, depending on the type of code or message. The front panel
will display “HLP” and a number for the help code. The error messages will be
displayed as one or two abbreviated words. A description of the help codes and
the error messages is given below in table 7-3 along with possible corrective
action that may need to be taken.
Table 7-3. Help codes and error messages for the Discharge Power Supply.
