Metrohm 711 Liquino - Manual (Page 156)

6.5 Diagnosis
711 Liquino, Instructions for use 150
6.5 Diagnosis
6.5.1 General
The 711 Liquino is a very precise and reliable control instrument. Its func-
tions can hardly be affected by external mechanical or electrical influ-
ences thanks to its robust construction.
Although it cannot be completely excluded that a defect could occur in the
instrument, there is a greater possibility that malfunctions may be
caused by incorrect operation or handling, or by incorrect connections,
or by operation together with instruments from other manufacturers.
In each case it is advisable to localize the fault by diagnosis; this can be
carried out rapidly and easily. The customer only needs to contact
Metrohm service when a real fault is present in the instrument. In addi-
tion, the results of the specific diagnosis functions allow the customer to
provide the service technician with far more accurate information.
If you have any questions always provide us with the following information:
the manufacturing number on the name plate (see page 3), the program
version (see Configuration, page 69) and any error message which
might be displayed.
Procedure
The diagnosis menu given in Sect. 6.5.2 shows all components for which
detailed instructions (diagnosis steps) exist for checking their functions.
If a possible fault occurs we recommend that you carry out the instructions
given in the relevant diagnosis step or carry out all the diagnosis steps
as a routine check of the instrument.
The Liquino reactions given in the instructions should be compared with
the descriptions in the diagnosis step. If the instrument does not show
the expected reaction ("No" case) then the corresponding diagnosis step
should be repeated in order to exclude an operating error. However, if
wrong reactions occur repeatedly there is a strong possibility that a fault
exists.
Required instruments:
Only necessary when RS232 or Remote are to be checked:
• Test plug 3.496.8510 (to socket ‘"Remote")
• Test plug 3.496.8560 (to socket "RS 232")