Samsung SCX-5312F Service Manual

Also see for Office Master SCX-5312F: Manual Driver manual Driver guide Product guide Manual Del Usuario

Contents

TroubleshootingSamsung Electronics 4-174-6-2 FAX(only SCX-5312F)4-6-2-1 FAX/TELEPHONE PrecautionsPROBLEM ITEMS TO BE CHECKED. HOW TO SOLVETEL LINE CANNOT BEENGAGED(NO DIAL TONE)• When you press “ OHD” key:a) Check line cord connection.b) Check MAIN LIU harness, and CN1(LIU PBA).c )Check relay operation of LIU PBA :Is the control signal of CN20-7(main) low?a) insert it correctly into the connectionjack called “line”.b) Replace defective parts.c) Replace main PBA IF the control signalof CN20-7(main) is high.Replace LIU PBA if high but phone linecannot be connected.Cannot MF dial • Check CN20 (main PBA), MAIN-LIUharness, and CN1 (LIU PBA)• Replace defective parts.MF dial is possible butnot DP dial.• Check DP control signal of CN20-11 ofMAIN PBA and the circuit around R15. U6and Q2 of Liu PBA.• Replace LIU PBA.Defective fax transmis-sion• Check CN20 (main PBA), MAIN LIUharness, and CN1(LIU PBA).• Is the external phone hooked off?• Check ‘hook off’ : Refer to ‘TEL LINECANNOT BE ENGAGED’ above.• Check the control signals of CN20-11.• Check transmission path : Check output ofCN20-3.4 and T2-4(LIU PBA).• Check reception path : Check output CN1-1 (LIU PBA) and input of CN20-1(main PBA).• Replace defective parts.• Replace LIU PBA if low.• Refer to ‘TEL LINE CANNOT BEENGAGED’ above.• Replace main PBA, if the signals of CN8-11 (MAIN PBA) is low.• Replace main PBA, if abnormal.• Replace LIU PBA if CN1-1(LIU PBA) is notconfirmed.Replace main PBA if CN20-1(MAIN PBA)is not confirmed.Defective automatic faxreception• Is the ring checked?Check ring pattern at CN1-9 (LIU PBA).• Refer to ‘Defective Transmission.’• Replace LIU PBA if it cannot be checked.• Refer to ‘Defective Transmission’.