MKS 146C - Configuring the Dual Channel Pirani;Convection Board as Single Channel Board

Chapter Three: Overview Inside the T
yp
e 146 Unit
51
Configuring the Dual Channel Pirani/Convection Board as Single Channel Board
The Pirani/Convection board can function as a single channel board. MKS will have configured
the board as a single channel board, if you requested it when you placed the order. The board
will be configured for dual channel operation if you did not specify single channel operation. If
you did not request the single channel configuration, but wish to configure the board for single
channel operation, follow these instructions.
Warning
The 146 unit has lethal voltages inside. To avoid the danger
of electrical shock, disconnect the power line
before opening
the unit.
1. Be sure the power cord is disconnected.
2. Disconnect all cables from the 146 unit.
3. Remove the four (4) Phillips screws on the outside corners of the rear panel and the
seven (7) screws from the top cover.
4. Remove the top cover by firmly pulling it towards the back of the unit. Note the
orientation of the cover since the center hole is slightly off center to accommodate a
connector if a board is positioned in slot 5.
5. Carefully turn the unit over so that it is bottom-side up and remove the seven (7) screws.
6. Remove the bottom cover by firmly pulling it towards the back of the unit. Note the
orientation of the cover since the center hole is slightly off center to accommodate a
connector if a board is positioned in slot 5.
7. Remove the Phillips screw that is securing the Pirani/Convection board to the bottom of
the 146 unit.
8. Carefully turn the unit right-side up.
9. Unscrew the two small screws holding the slot cover on the Pirani/Convection board.
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