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Model 360E Instruction Manual TROUBLESHOOTING & REPAIR PROCEDURES
11. TROUBLESHOOTING & REPAIR PROCEDURES
This contains a variety of methods for identifying the source of performance problems with the analyzer. Also
included in this are procedures that are used in repairing the instrument.
CAUTION
The operations outlined in this chapter are to be performed by qualified maintenance
personnel only.
CAUTION
Risk of electrical shock. Disconnect power before performing the following
operations.
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 CPU and I
2
C buses are running, and if
the sync/demodulator and relay board are 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
points on the relay board.
4. SUSPECT A LEAK FIRST! Data from Teledyne Instruments’ service department indicates that 50% of
all problems are eventually traced to leaks in the pneumatic connections and gas lines of the analyzer
itself, the source of zero air, span gases or sample gas delivery system.
Check for gas flow problems such as clogged or blocked internal/external gas lines, damaged seals,
punctured gas lines, a damaged pump diaphragm, etc.
5. Follow the procedures defined in Section 11.5 for confirming that the analyzer’s basic components are
working (power supplies, CPU, relay board, sync/demod board, keypad, GFC wheel motor, etc.). See
Figure 3-3 for general layout of components and sub-assemblies in the analyzer. See the wiring
Interconnect Drawing and Interconnect List, documents 04216 and 04217.
05232 Rev B3 191