Metrohm 751 GPD Titrino - Manual (Page 196)

4.2. Diagnosis
751 GPD Titrino
193
4.2 Diagnosis
4.2.1 General
The GPD Titrino 751 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 im-
proper connections and operation with non-Metrohm instruments.
It is 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 in-
strument. 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 (page 3) and program number (see configuration,
page 8) and specify possible error displays..
4.2.2 Procedure
• The diagnostic steps must be performed in sequence and compared with the reactions of
the 751 GPD Titrino (indented). In the "yes" case, continue with the next instruction.
• If the instrument does not show the expected reaction ("no" case), the appropriate dia-
gnostic step must be repeated to exclude an operating error. With repeated wrong reacti-
ons, however, there is a strong possibility that a malfunction exists.
• The diagnostic steps allow re-entry into the test routine for repetition if the following dis-
play appears:
diagnose press key 0...9
If the instrument is in a subprogram of the diagnostic routine: Press <Clear>.
If need be, switch the power off then on again after a few seconds. At the same time press
key <9> until the above display appears.
• If <Clear> has been pressed during the display of 'diagnose press key 0...9', the instrument
returns to the user program.
• Error display: An error is shown in the display as follows:
error XX
error number
• If a fault causes the burette drive to stick at the top or bottom end of the cylinder, see pa-
ge 205, point 4.4