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Repairing the Pump
Exchanging the Low Pressure Pump Main Board (LPM Board)
WARNING The RFI spring plate sitting on the board connectors is very sharp! Be
careful, not to cut yourself, when removing it from the old board an
sliding it onto the new board.
6 In most cases the RFI spring plate (Radio Frequency Interference spring plate,
prevents radio emissions from the instrument to ambient) remains on the
interface connectors of the board. Carefully remove the spring plate from the
old board and slide it onto the new board before installing the board in the
pump (the RFI spring plate is NOT part of an exchange board).
NOTE If you have to exchange other parts also, continue with that work, first.
7 On the new board check the switch setting of address switch S1, see “Setting
the 8-bit Configuration Switch” on page 223.
NOTE An incorrect switch setting (e.g., TEST/BOOT) may cause the pump to turn
into a basic mode (yellow or red flashing status light). In such a case turn off
the pump, re-set the address switches, and turn on the pump again.
8 Install the new board and reconnect the connectors. Make sure that the board
is fitted correctly in the board recess holes at the rear panel.
9 Refit the connector screws, and reconnect all connectors. Ensure the
connectors are seated securely.
10 Replace foam and top covers, see “Replacing the Top Cover and Foam” on
page 156.
11 Reinstall the pump in the stack. Reconnect all cables. Turn on the quaternary
pump. If pump status indicator turns red continue with the section “Entering
the Type Command”, otherwhise continue with “Entering the Serial Number”
on page 135.