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4 - Turn-On Checkout
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Runtime Error Messages
Appendix C lists other error messages that may appear at runtime. Some of these messages will also
appear on the front panel when the Prot key is pressed. To clear the error, you must remove the condition
that caused the error and then press the Prot Clear key.
Table 4-2. Runtime Error Messages
Error Description
Overvoltage an overvoltage condition has occurred
Overcurrent an overcurrent condition has occurred
Overtemperature an overtemperature condition has occurred
Remote inhibit a remote inhibit signal has been applied to the RI input
+ sense open a positive sense or load lead is open
- sense open a negative sense or load lead is open
+/- sense open a positive and negative sense or load lead is open
sense open incorrect voltage reading on the sense leads, the unit may need to be
recalibrated
If the front panel display shows OVLD , this indicates that the output voltage or current is beyond the
range of the meter readback circuit. If this is the case, check that the setting of the output compensation is
correct for the phone you are testing. If the front panel display indicates -- -- -- -- -- , an GPIB
measurement is in progress.
Line Fuse
If the dc source appears "dead" with a blank display and the fan not running, check your ac mains to be
certain line voltage is being supplied to the dc source. If the ac mains is normal, the internal line fuse may
be defective.
Refer to Appendix E and follow the procedure described in the appendix for accessing and replacing the
line fuse located inside the unit. Do not change any of the line voltage connections.
NOTE: If the dc source has a defective fuse, replace it only once. If it fails again, the dc source
requires service.