MKS 146C - The LED

Chapter Three: Overview Dis
p
la
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less 146 Unit
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The LED
The LED on a displayless 146 unit indicates the status of the unit. When a displayless 146 unit
is powered on, the LED condition is as follows:
1. The LED turns red, then changes to green within a few seconds.
This indicates that all systems are operating properly.
2. The LED turns red and stays red.
This indicates a power up problem is detected. The error code can be displayed or
queried through RS-232 communications.
A. Turn power to the displayless unit off and then on again.
If only one non-fatal error condition was detected, the LED turns red and
changes to green within a few seconds.
If more than one non-fatal error condition was detected (such as codes C11, E4,
or E10), the LED remains lit. The error code can be displayed or queried
through RS-232 communications.
B. Cycle the power a few more times to allow the unit to cycle through the non-
fatal error conditions.
3. After cycling power to the 146 unit several times, the LED still remains red.
This indicates a fatal error condition (such as E2, E3, E12) is detected. The error code
can be displayed or queried through RS-232 communications (if it is still operating).
Note
If querying the error code through RS-232 communications, use the
power up status command, described in the
RS-232 Communications
chapter.
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