41www.norcold.com/cda 1200XX/120X-IMXX ModelsRefrigerator Service ManualCONTROLSOptical Control AssemblyThe optical control assembly, located on the front ofthe refrigerator, communicates with the power boardthrough a "foamed in" wire harness (this wire harnessis not connected to the ice maker wire harness).Drilling or puncturing the refrigerator rear panels maycause damage to the wire harness. Controls andrelated features are shown in Figures 40 and 41. Unitswith serial numbers 832170 and lower have controlsshown in Figure 40, and units with serial numbers832170 and higher have the controls shown in Figure41. Two screws hold the optical control assembly intoplace.Replacing Optical Control Assembly1. Turn the refrigerator OFF.2. Remove the two control retaining screws, thenremove the optical control assembly.3. Disconnect the optical control assembly from thewire harness.4. Connect the replacement optical control assemblyto the wire harness.5. Install the optical control assembly on the divider,then install the control retaining screws. Do notovertighten the retaining screws.6. Turn on the refrigerator, then check all of theoptical control assembly functions.Figure 40. Optical control assembly, serial numbers 832170 and lower1 COLD - 9 COLDEST SET TEMP MODE ON / OFFonTEMP SET SwitchPress momentarily to view temperature setting.Press and hold to select a temperature setting.Settings: 1= cold/9= coldest.Two 7-Segmet LED DisplayShows operation mode AUTO, AC, and LP.Shows fault codes and diagnostic information.Shows temperature setting.MODE SwitchPress momentarily to display operating mode.Press and hold to select AUTO, AC or LP ManualMode.Release when desired mode displays.Power SwitchPress momentarily to turn ON refrigerator.Press and release after three seconds toturn OFF refrigerator.TEMP SET SwitchPress momentarily to view temperature setting.Press and hold to select a temperature setting.Settings: 1= cold/9= coldest.Two 7-Segmet LED DisplayShows operation mode AUTO, AC, and LP.Shows fault codes and diagnostic information.MODE SwitchPress momentarily to display operating mode.Press and hold to select AUTO, AC or LP ManualMode.Release when desired mode displays.Power SwitchPress momentarily to turn ON refrigerator.Press and release after three seconds toturn OFF refrigerator.Cold ColdestONOFF MODETEMPSETAC LP GASAUTOFigure 41. Optical control assembly, serial numbers 832171 and higher