Metrohm 750 Autosampler - Manual (Page 48)

4.4 Error messages
750 Autosampler
45
Malfunctioning injection valve
If samples are only injected sometimes or not injected at all the injec-
tion valve of the 733 IC Separation Center must be checked. This is
done by carrying out several injections with the 750 Autosampler while
keeping the valve under observation. If the valve rotates perfectly but
still no sample is injected then either a leak or a blockage is present
(further procedure see chap. 4.3.1).
If the valve does not rotate proceed as follows: first check whether one
of the two pilot lamps of the <FILL> or <INJECT> keys of the 733 IC
Separation Center is lit up. Then check whether both plugs of
6.2128.100 connection cable between the 750 Autosampler and the IC
Separation Center are properly plugged in and that electrical contact is
made. Then trigger several injections by the 750 Autosampler and ob-
serve the valve. If the valve does not rotate, remove 6.2128.100 con-
nection cable to the 733 IC Separation Center and operate the injection
valve manually by means of the <FILL> and <INJECT> keys. Please
inform Metrohm service if the valve can only be rotated with these keys
or not rotated at all.
4.4 Error messages
There are two categories of error messages that the 750 Autosampler
can display. Entry errors are errors usually caused by the user making
an illegal keyboard entry or selection. These errors are identified by a
flashing "
ERROR
" message, displayed on the top line of the display.
System error messages occur after a mechanical fault has been de-
tected in the instrument. Service is usually indicated when a system
error occurs. If the Autosampler is being operated under remote com-
puter control by the RS232 interface, the error message will be sent in
the form of a coded number.
4.4.1 Entry error messages
"A Method is NOT currently running"
The method status display was requested (from the method
menu), but there is no method running.
"Cannot delete a Method that is currently running"
An attempt was made to delete a method while that method
was running.