Metrohm 709 IC Pump - Manual (Page 40)

4 Notes – Maintenance – Faults
709 IC Pump
32
4.4 Diagnosis
4.4.1 General information
The 709 IC Pump is a very precise and reliable instrument. Thanks to its
rugged construction it is virtually impossible for external mechanical or
electrical influences to have an adverse effect on its functions.
Although the 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 through improper connections and
operation with non-Metrohm instruments.
It is thus advisable in each case to isolate the fault with the rapid and
easy to perform diagnostic tests. The customer thus need not call
Metrohm service until there is a true fault in the instrument. In addition,
with the aid of the numbering in the diagnostic program he can provide
the service engineer with much more accurate information.
In inquiries always quote the manufacturing number 39 of the 709 IC
Pump (see Fig. 2), program version (see section 4.4.2) and specify
possible error messages.
Procedure
The diagnostic steps must be performed in sequence and compared
with the reactions of the 709 IC Pump (indented). In the "yes" case, con-
tinue with the next instruction.
If the instrument does not show the expected reaction ("no" case), the
appropriate diagnostic step must be repeated to exclude an operating
error. With repeated wrong reactions, however, there is a strong possi-
bility that a malfunction exists.
Equipment needed
3.496.8480 Test plug (Necessary only if external required functions
(RS 232) should also be checked).