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General Troubleshooting & Repair of the M400E Analyzer M400E Ozone Analyzer Operator’s Manual
5. Follow the procedures defined in Section 3.5.4 to confirm that the analyzer’s vital functions are working
(power supplies, CPU, relay PCA, keyboard, PMT cooler, etc.).
See Figure 3-1 or the general layout of components and sub-assemblies in the analyzer.
See the wiring interconnect diagram and interconnect list in Appendix D.
13.1.1. FAULT DIAGNOSIS WITH WARNING MESSAGES
The most common and/or serious instrument failures will result in a warning message being displayed on the
front panel. Table 13-1 lists warning messages, along with their meaning and recommended corrective action.
It should be n
oted that if more than two or three warning messages occur at the same time, it is often an
indication that some fundamental sub-system (power supply, relay PCA, motherboard) has failed rather than
indication of the specific failures referenced by the warnings. In this case, it is recommended that proper
operation of power supplies (See Section 13.7.2), the relay PCA (See Section13.7.5), and the motherboard (See
Sec
tion13.7.7) be confirmed before addressing the specific warning messages.
The M40
0E will alert the user that a Warning Message is active by displaying the keypad label MSG on the Front
Panel. In this case, the Front panel display will look something like the following:
STANDBY SYSTEM RESET
TEST CAL MSG CLR SETUP
The analy
zer will also alert the user via the Serial I/O COM port(s) and cause the FAULT LED on the front panel
to blink.
To view or clear the various warning messages press:
Suppresses the
warning messages
Press CLR to clear the current
message.
If more than one warning is
active, the next message will take
its place.
Once the last warning has
been cleared, the
ACT CAL
function returns will be
displayed in the analyzer’s
main
MESSAGE FIELD.
NOTE:
If a warning message persists after
several attempts to clear it, the message
may indicate a real problem and not an
artifact of the warm-up period
SAMPLE SYSTEM RESET
TEST CAL MSG CLR SETUP
SAMPLE SYSTEM RESET
TEST CAL MSG CLR SETUP
SAMPLE SYSTEM RESET
TEST CAL MSG CLR SETUP
SYSTEM SYSTEM RESET
TEST CLR SETUP
MSG returns the active
warnings to the message
field.
STANDBY RANGE=500.0 PPB
TEST CAL MSG SETUP
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