Micromass Quattro Ultima, User Manual

Page: 209 / 227

Once the rate has been measured and set, a note should be made of the back
pressure readout on the pump, as fluctuation of this reading can indicate
problems with the solvent flow.
For APcI a higher than normal back pressure readout on the HPLC pump can imply
that, after a long period of use, the filter pad requires replacement.
General Loss of Performance
Should the preceding checks fail to reveal the source of the problem proceed as
follows:
Check that the source and probe voltage readbacks vary with tune page settings.
If any of these voltages are absent check that the source and hexapole transfer
lens assembly have been correctly reassembled.
Further investigation, which require the services of a qualified service engineer,
should be left to Micromass personnel.
Maintenance and Fault Finding
Page 209
Quattro Ultima
User's Guide