Inside the Type 146 Unit
Chapter Three: Overview
72
How To Configure the Control Board to Drive Different Valves
1. Be sure the power cord is disconnected.
Warning
The 146 unit has lethal voltages inside. To avoid the danger
of electrical shock, disconnect the power line
before opening
the unit.
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 on a board 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 on a board positioned in slot 5.
7. Remove the shorting jumpers that are currently placed on and jumper packs numbered
JP1 through JP5.
Short jumper packs JP1 and JP4
for 154 valve configuration
Short jumper packs JP3
and JP5 for 148 and 248
valve configuration
Figure 20: Jumper Placement on the Control Board
8. Place the shorting jumpers on JP1 and JP4 (for a Type 154 valve) or place the jumpers
on JP3 and JP5 (for Type 148 or 248 valves).
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