Note On Intermittents

If circuit No. 685 were intermittently grounded, Code B123 could be stored. Manipulate circuit No. 685 while observing BI01 display with dimmer at a low setting. If short occurs, value will switch from "HIGH" to "LOW".

Also check BD42 display. Cycle panel dimming control from minimum to maximum. If BD42 display does not range between 2-98 percent, or never reads more than 75 percent, replace left switch assembly.

Fig 1: Code B123, Flow Chart Panel Lamp Switch Circuit