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134
Repairing the Pump
Exchanging the Low Pressure Pump Main Board (LPM Board)
Entering the Type Command
NOTE The main board is physically identical for the isocratic and the quaternary
pump. After the installation of a new mainboard the TYPE (isocratic or
quaternary) of the module is normally automatically detected. The specific
TYPE tells the pump how to configure itself during turn on. In some cases,
especially when a defective mainboard is replaced with an older version of
mainboard, the automatic TYPE detection does not work. When the TYPE of
the exchange main board does not match the pump, a pump configuration
error will occur during pump turn on. This will cause the pump status
indicator to be red. In this case the TYPE of the module has to be entered using
the procedure described in the following sections.
You must change the TYPE of the replacement main board to agree with the
quaternary pump (G1311A). The TYPE can be entered using either the
control module or the ChemStation, see “Entering the Type Command using
the Control Module” on page 134 or “Entering the Type Command using the
ChemStation” on page 135.
Entering the Type Command using the Control Module
1 Connect the control module to the pump.
2 From Views (press F5) select the System screen, then press Tests (F3).
3 Using the up/down arrows, make sure that the quaternary pump is highlighted
and press Enter. The Tests screen for the quaternary pump should now be
displayed.
4 While in the Tests screen, press m.m (m dot m). From the box now displayed,
select the Command line, and press Enter.
5 Into the box labeled Instr, enter the command TYPE G1311A.
6 Letters and numbers are created using the up and down arrows. There must
be a blank space between the word TYPE and the letter G.
NOTE It is important to enter the TYPE command correctly. An incorrect type
command may cause the module to turn on in it's resident mode. In such a
case, re-enter the TYPE command correctly.
7 When the command is entered, press Enter to highlight the complete
command.