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E
In Case of Trouble
Introduction
The Agilent E4370A MCCD has a built-in self test capability which is performed at power-on.
Additionally a more complete self test can be done by executing the cfSelftest; function or running self
test from the Agilent MCCD User Interface. This selftest capability provides an effective diagnostic tools
to isolate problems for rapid repair. Refer to chapter 5 under Selftest for more information.
CAUTION: Make sure that no cells are connected when running a user-initiated self test to avoid
potentially hazardous voltages from appearing across any cells during the testing process.
Fault LEDs (see Figure 1-2)
If any of the Fault LEDs on the front of an Agilent E4370A/E4374A MCCD System are on, it indicates
that there is a fault associated either with the mainframe or a charge/discharger card. Before replacing the
card or mainframe, follow the procedures outlined in the following table.
Table E-1. Fault Indicators
Agilent E4370A FAULT
External
Indicates an external fault such as
External digital fault signal,
External power fail shutdown signal,
High power bus voltage after power on,
Low power bus voltage after power-on.
Overtemperature.
To clear the light, first remove the condition that caused the fault. Then either cycle power to
the unit, send a Protect Clear API programming command, or press Protect Clear on the
Agilent MCCD User Interface to clear the fault register.
Internal
Indicates an internal hardware fault such as
Selftest failure.
Calibration error.
Hardware error.
If the Internal LED is lit without any fault LEDs on the Agilent E4374A
Charger/Discharger cards being lit, it indicates that the Agilent E4370A MCCD mainframe
is defective. Return the unit for service.
If a fault LED is lit on a charger/discharger card, turn the mainframe off and replace the
defective card by loosening its thumbscrews and pulling the card out of its slot.
If you replace a defective card and the Internal LED is still lit on the mainframe, the
mainframe is probably defective. Return the unit for service.