This system had two parts, a controller board, usually located in or by the automation and the dimmer board(s) located in a small rectangular box near your breaker panel...the controller was connected by just a pair of wires for each channel. The two rocker switches were actually a two-step thing. The left one, brought the lights down to mid, the right one brings them down to dim. To bring the lights back to mid you push up on the right one...to go back to bright, you push up on the left one.
It was kinda a hokey system but in 15 years and a dozen or so dimmers, I have had 0 failures of any kind.
I believe a company called EDLO or somthing to that effect took over the RAVEN stuff until ED retired.
Steve
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"Old projectionists never die, they just changeover!"
Orient your board with the terminals at the bottom. You should see 5 trim pots (single turn). They are grouped such that there are three across nearly in the middle of the board and two are in vertical orientation in the upper right section.
The three across are (from left to right) "stage dim", "stage bright", and "factory balance." The stage dim and bright levels speak for themselves (there is interaction between stage and house levels). The factory balance control is set such that the lights don't shimmer/flicker and sets the range of the dimming circuit.
This leaves the two pots in vertical orientation, the upper one is the "stage speed" , the lower one is the "house speed."
In addition to the previously mentioned rocker switches (previous post) there are supposed to be two external controls (single turn pots) to set "house half" level and "house dim" level.
Steve
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"Old projectionists never die, they just changeover!"