Installation
System PCAs
d. Disconnect the plug-in screw terminals from the board connectors. If the
connector is tight, brace the board with your hand, taking care not to touch
the circuit or components, and pull firmly but carefully. Lay the cables and
connectors back over the edge of the housing so they will not be in the way
when lifting the unit out of the housing.
2. Change the detector-transmitter electronics of the integrated unit.
a. To remove the ISIO, Main CPU or Power Supply PCA
i. Detach any cabling and gently pull the PCA from its connection port.
ii. Insert the new PCA into the connection port.
iii. Reattach any cabling.
b. To remove the IBP PCA
i. Remove the ISIO, Main CPU and Power Supply PCAs by detaching any
cabling and gently pulling the PCAs from their connection ports.
ii. Detach any cabling and remove the four retaining screws holding the IBP
PCA to the card cage.
iii. Remove the IBP PCA by sliding it out parallel to the LVDN_Preamp
PCA.
iv. Slide the new IBP PCA board in, insert the retaining screws and reconnect
any cabling from the old board to the new PCA.
v. Reinsert the ISIO, Main CPU and Power Supply PCAs into their
connection ports and reattach any cabling.
c. To remove the LvDn_Preamp PCA
i. Remove the bolts in the card cage located to the left and right of the
photomultiplier tube.
d. Gently pull the photomultiplier tube straight out to disconnect the pins
attached to the LvDn _Preamp PCA.
i. Detach any cabling from the PCA.
ii. Remove and replace the LvDn _Preamp PCA.
iii. Reattach any cabling and the photomultiplier tube to the PCA.
iv. Insert the two screws/bolts.
3. Reinstall the two screws previously removed from the card cage to secure it into
the housing.
4. Reconnect the plug-in screw terminals to the board connectors, and replace the
housing access cover.
5. Apply power to the unit.
3-6 DensityPRO Installation Manual Thermo Scientific
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