Samsung RF195ABRS Service Manual

Contents

51TROUBLESHOOTING4-2-5. If Power is not suppliedCautionAt the power of main PCB, AC input powerand a high voltage over DC170V(325V)areoccurred. Please take care of yourself onrepair and measurement.Check in SMPS partStart- Refer to function and 'reference'parts in the manual whenchecking Main PCBConnect plug again, & check the plugloosening.1) Change FUSE AC 250V 2.0A2) Replace PCB ASS'YCheck the assembly and connection ofwire1) Check PCB PATTERN and replaceBD12) Replace PCB ASS'Y1) Check REG1 (KA7805)2) Replace PCB ASS'Y1) Check & repair the assembly of wire2) Replace Panel PCB1) Check the contact of Lead Wire2) Replace the applicable Relay(Replace PCB Main)1) Solder again2) Replace PCB MainReplace PCB ASS'Y- Check Main PCB connection- Check the connections betweenupper hinge Cabi-Door- Check Door Panel PCB connectionIs plug connected in ?Input Voltage115V ± 15%Is Fuseon the SMPS PCBnormal?Is 115Vapplied to both terminals ofSMPS power VAR1 ?Is DC 170Vapplied to both terminals ofBD101 +,-?Is 12V applied toboth terminal of C111?Is 5Vapplied to both terminal ofC113?DoesPanel PCB operatesnormally?Is the loadsuch as relaynormal?Is there anyPCB soldering, Short, orbreakage?Normal (Recheck)ó Checking method of voltage SMPS input ;VAR1 both terminals, or CN10 both terminalAC power.Common PCB GroundREG1 Heater Sinkó Checking method of DC secondary output voltageREG1 input ; Regulator 7805 input ª Samewih C111 both terminals.DC 12.0V 0.8Vó Checking method of DC secondary output voltageREG1 input ; Regulator 7805 input ª Samewith C113 both terminals.DC 5V 0.5V