Samsung RS257BABB Service Guide - Page 45
Diagnostics
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11. Diagnostics 11-1) If power is not ON Caution! At the power of main PCB, the 115V power and a high-voltage over DC 170V occur. Please take care of yourself on repair and measurement. To check the main PCB, please apply descriptions of operation and references in the manual. Start - Check the connections of main PCB. - Check the connections between upper hinge and CABI-door. - Check the connections between door and panel PCB. Is 115V AC fuse down? YES Is power 115V NO both terminals of CN10? Is fuse on main PCB down? YES Is DC 170V impressed to both NO terminals of BD1? Top S/W 233Y NO Is the voltage impressed DC 5.8V between C and S ? Is 12V impressed to both NO terminals of C102? NO Is the load such as relay normal? Is normal the load, such as NO relay? NO Is there any PCB soldering, short or broken? NO Normal Check the exchange of fuse and disconnection cause. Check the assembly and connection of electric wires. Exchange fuse 115V 2A? Check the PCB pattern and replace BD1. Replace PCB assembly. 1) Replace D104 (D5S6M). 2) Replace PCB assembly. Replace REG1(KA7805) 1) Check the assembly of electric wires and troubleshoot. 2) Replace the panel PCB. 1) Replace the corresponding relay. 2) Check lead wire for contact. Replace PCB assembly. 45