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Model 400E Ozone Analyzer
Instruction Manual
11. TROUBLESHOOTING & REPAIR
PROCEDURES
This section contains a variety of methods for identifying the source of performance
problems with the analyzer. Also included in this section are procedures that are
used in repairing the instrument.
11.1. General Troubleshooting Hints
The analyzer has been designed so that problems can be rapidly detected,
evaluated and repaired. During operation, the analyzer continuously performs self-
check diagnostics and provides the ability to monitor the key operating parameters
of the instrument without disturbing monitoring operations.
A systematic approach to troubleshooting will generally consist of the following four
steps:
1. Note any WARNING MESSAGES and take corrective action as required.
2. Examine the values of all TEST functions and compare to Factory values. Note
any major deviations from the factory values and take correction action as
required.
3. Use the Internal Electronic Status LED's to determine whether the I
running and the and Relay Board is operating properly. Verify that the DC power
supplies are operating properly by checking the voltage test points on the Relay
Board. Please note that the analyzer's DC power wiring is color-coded and these
colors match the color of the corresponding test point on the relay board.
P/N 04316 Rev: B
The operations outlined in this chapter are to be performed by
qualified maintenance personnel only.
Risk of electrical shock. Disconnect power before performing the
following operations.
TROUBLESHOOTING & REPAIR PROCEDURES
NOTE
CAUTION
2
C bus is
243
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