Signal Output
Warn: and fault: messages
CWARN: SIGNAL CHANGED and/or WARN: NO DETECTORS is displayed if a detector previously assigned to a particular signal channel is found to be absent; for example, if the signal board for a given detector should fail or be removed for service.
CFAULT: INET CPU is displayed if the processor (and/or its associated circuitry) for HP 5890 INET operations should fail.
HP 5890 diagnostics generating the above message displays are active at all times in normal operation. The next group appears only if a problem is found to exist at HP 5890 power•on:
CRemaining FAULT: INET messages are displayed if problems are diagnosed in INET circuitry.
CFAULT: ATTN1 TEST and/or FAULT: DAC1 TEST occur if problems are diagnosed in signal path circuitry for a particular signal channel (channel 1, in the example displays).
In general, if signal problems are suspected, power to the HP 5890 may be turned off, and then on again to perform internal self•testing. Appropriate message displays occur if problems are found to exist.
Note: In case multiple problems exist simultaneously, press
CLEAR
to
roll through NOT READY and/or FAULT: displays.
Note that, with exception of WARN: OVEN SHUT OFF, 
CLEAR
erases any
displayed WARN: message.
For WARN: messages, the instrument remains operational, except for
the function indicated by the message: the message is erased upon pressing any instrument function key (e.g., 
OVEN TEMP 
). For FAULT: messages, in addition to the message, the red NOT READY LED blinks: the instrument CANNOT be operated until the problem is corrected.
If a WARN: or FAULT: message occurs in normal operation, try switching power to the instrument off, and then on again. If the problem recurs when power is restored, service procedures are indicated.
93