5.4
Section 5.3 Detailed repair procedures.
Section 5.4 Servicing procedures for Servomex sampling systems.
5.1 DIAGNOSTIC FLOW CHARTS
The purpose of these diagnostic flow charts is to assist in locating analyser faults. They cannot
include every potential fault but they will enable the identification of a sub-assembly which requires
replacement.
Fault finding on 500m separation systems which have an Interface unit is slightly different. If the
display of the Control unit shows flashing hyphens it indicates that data is not being received from
the Interface unit. To assist in fault finding it is possible to remove the complete door assembly
from the Control unit and fit it to the Interface unit, (In safe areas only). The Interface unit then
works as a Control unit and it can be tested as a normal analyser.
Part numbers of printed circuit boards on some older analysers may differ to those mentioned in
these flow charts.
01100 916A replaces 01100 916
01100 918C and 01100 918D replaces 01100 918A, 01100918B and 01100 915
01100 925B replaces 01100 905 and 01100 905A
01100 936 replaces 01100 906 and 01100926
01100 927 replaces 01100 907
01100 939 replaces 01100 909
01101 902 replaces 01100 902
With the exception of the microprocessor board (01100918C and 01100918D) the later boards are
compatible with the earlier boards and may be used as direct replacements for these.
See Section 6.7 for full information on interchangeability of boards and software.
Note that some of the boards have a suffix letter after the part number (ie. 01100925B), this
indicates that a small change has been made to the board, it does not mean that they cannot be
interchanged.
The flow charts can be used for the earlier analysers if the above part numbers are substituted.
5.1.1 Initialisation of Tests (Restart)
Before proceeding with the flow charts in the event of a malfunction of the analyser first restart
the instrument by switching the electrical power off and on. Then follow the diagnostic flow charts
starting at 1.
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