Metrohm 788 IC Filtration Sample Processor - Manual (Page 149)

6.4 Diagnosis
788 IC Filtration Sample Processor
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6.4 Diagnosis
6.4.1 General Information
The 788 IC Filtration Sample Processor is a very precise and reliable
control instrument. Thanks to its rugged construction, its functions are
rarely influenced by mechanical or electrical affects.
Although an occasional fault in the instrument can not be excluded
completely, it is certainly much more likely that malfunctions are caused
by wrong operation or handling or by improper connections and opera-
tion with non-Metrohm instruments.
In any case it is advisable to localize the error with the quick and easy-
to-use diagnostic functions. Metrohm Service only needs to be con-
tacted if an actual error is apparent in the instrument. Additionally, the
service technician can be much more precisely informed with the aid of
the results of the specific built-in diagnostic functions.
In inquiries always quote the serial number 38
38 38 38 (see Fig. 2) and program
version (see program , section 4.2.1 "Configuration") and specify possi-
ble error displays.
Procedure
The following test list shows all components for which there are detailed
instructions (diagnostic steps) to check their functionality.
If there is a possible malfunction we recommend following the instruc-
tions of the corresponding diagnosis step or running all the diagnosis
steps as a routine check of the instrument.
The reaction of the 788 IC Filtration Sample Processor to the instruc-
tions should be compared with the description in the diagnosis step. If
the instrument exhibits an unexpected reaction ("no" situation), the di-
agnosis step should be re-run to rule out operating error. Several false
reactions however, indicate a high probability of a disorder.
Components see section
Working memory (RAM) section 6.4.3
Display section 6.4.4
Keyboard section 6.4.5
Remote section 6.4.6
RS 232 section 6.4.7
External Bus section 6.4.8
Beeper section 6.4.9
Rack code section 6.4.10