Samsung RS257BABB Service Guide - Page 53

Diagnostics 11-8) If CoolSelect ZoneTM isn't operated normally (RS2556, RS2578) 1) If the lamp of CoolSelect ZoneTM is not lit. Start Is the connector of NO CoolSelect ZoneTM inserted correctly in the fridge? YES Reinsert the connector; troubleshoot Is the connector of main NO a bad contact. PCB (CN51) inserted correctly? Where the Panel key isn' t selected: YES Is the connector of CoolSelect ZoneTM panel PCB inserted ? YES Is lighting operated normally when the exchange of CoolSelect ZoneTM panel PCB? NO YES Reinsert the connector in the main PCB. Reinsert the connector; troubleshoot a bad contact. NO 1.Check the wires of CoolSelect ZoneTM- check the disconnection of wire, short between wires. 2. Check the Lighting Circuit of CoolSelect ZoneTM panel in the main PCB for Short/Open. 3. Check the main PCB of CoolSelect ZoneTM assembly for Short; the state of wire assembly between the panel and main PCB. Panel PCB has trouble for itself. 2) Where the Panel PCB key isn't selected: - The basic method is applied to check - if you fail in troubleshooting after above the execution, then NO Aren't a key or more pressed continuously? YES Isn't the PCB system still operated by separation? NO � Refer to 8-7) CoolSelect Zone TM, Panel Circuit and measure the wave form. YES Is lighting operated normally after the exchange of panel-PCB? NO Is a periodical wave form outputted from the main PCB IC5,IC4? YES YES NO 1. Check the wires of CoolSelect ZoneTM - check the disconnection of wire, short between wires. 2. Check Short/Open the Lighting Circuit section of CoolSelect ZoneTM panel in the main PCB from. 3. Check the inside main PCB of CoolSelect ZoneTM ass'y for Short; the state of wire assembly between main PCB. Reassemble the PCB ass'y/Enforce the cancellation of pressed keys Reassemble the PCB asswmbly and Enforce the cancellation of pressed keys Panel PCB has trouble for itself. 1. Replace the main PCB. 2. Check the wires of CoolSelect ZoneTM panel for Short. 53