Inside the Type 146 Unit
Chapter Three: Overview
60
Configuring the Dual Thermocouple Board as Single Channel Board
The Thermocouple 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 Thermocouple 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 Thermocouple board.
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