Samsung SF11OT Servise Manual
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Samsung SF11OT Servise Manual

Samsung SF11OT Servise Manual

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FACSIMILE

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Summary of Contents for Samsung SF11OT

  • Page 1 FACSIMILE...
  • Page 2 1 Precautions Follow these safety, l-l Safety Precautions Be sure that all built-in protective devices are Product Safety Notice: in place. Restore any missing protective Some electrical and mechanical parts have shields. special safety-related characteristics which might not be obvious from visual inspection. Make sure there are no cabinet openings These safety features and the protection they through which people- particularly children-...

  • Page 3: Esd Precautions

    Precautions Use only an solder removal device. Certain semiconductor devices can be easily “anti-static” solder removal devices not classified as damaged by static electricity. Such components are Some “anti-static” can generate electrical charges commonly called “Electrostatically Sensitive (ES) sufficient to damage ESDs. Devices”, or ESDs.

  • Page 4: Specification

    2 Specification Parameter Specification Max. Document Size Min. Document Thickness Horizontal Scan Line Length Vertical Effective Scanning Width Horizontal Flat-bed scanning using CIS Scanning Method Vertical Stepping motor Horizontal Standard: Resolution Vertical Fine: Super Fine: 15.4 lines/mm (392 lines/in) Parameter Specification Coding Scheme Recording Paper Size...
  • Page 5 Specifications Parameter Specification Communication Facility Public Switched Telephone Network (PSTN) Direct Line Coupling Transmission Speed Modem Carrier Frequency bps) Control Sianal 0 dBm to - 15 dBm +O.O I-3 dBm, adjustable in 1 dB steps Output Level Input Sensitivity 0 dBm to - 43 dBm and -5 dBm to -48 dBm Input &...
  • Page 6 In service mode (tech) mode, the technician can check the machine and perform various test to isolate the cause of a malfunction. To enter service mode, press MENU, #, 1,9,3,4 in sequence, and ‘TECH’ will be displayed in the LCD to confirm that the machine has entered service (tech) mode.

  • Page 7: Call Monitoring

    Operating Instructions CALL TRANSFERRING REMOTE PASSWORD This feature allows the fax to transfer You can change the three-character password used machine to access your machine from a remote phone. The incoming caller’s message to a specified remote password is preset to “#139#” (pound one three location.
  • Page 8 Operating Instructions RECEPTION LEVEL RING ON CHECK TIME Reception level may be too low due to cable losses. The machine must receive a ring signal with a If set to -43 dBm, reception sensitivity will be specified active time from a telephone exchange in between 0 and -43 dBm.

  • Page 9: Test Mode

    Operating instructions Test mode is used to test machine functions. To enter test mode, press MENU, 0, START/COPY buttons in sequence. You can print a TPH test pattern and check the heating element of TPH with this test pattern. Figure 3-1 is a sample test pattern.
  • Page 10 Operating Instructions ROM TEST MODEM TEST The modem will send various transmit signals on Tests machine ROM (Read Only Memory). The result and the software version appear in the LCD the telephone line. You can check the following: in the following format: tones: 1100 Hz, 1650 Hz, 1850 Hz, 2100 Hz MEMORY CLEAR Erases contents of RAM.
  • Page 11 Operating Instructions occurs: In user mode, the LCD shows the remote machine’s TTI number, communication type, In user mode, the display shows one of the (send or receive), and page number. following reasons: PAPER JAM, SEND ERROR, or RECEIVE ERROR. In service mode, the display shows the communication type, abbreviations for the CCITT In service mode, the display shows all error...

  • Page 12: Disassembly And Reassembly

    Note: Make sure power is OFF, and unplug the power cord from the wall outlet. Disconnect the handset cord modular plug from the machine. Remove the two rubber dummies from the holes and loosen the two screws. Push the upper cover in the direction of arrow to remove.
  • Page 13 Disassembly instruction Loosen the six screws fastening the top cover. Carefully lift the top cover as shown in the direction of the arrow. Figure 4-3 Disconnect the harnesses from the Main PBA. Loosen two screws fastening the Main PBA. Disconnect the harnesses from the LIU PBA. Remove the OPE unit from the base unit.

  • Page 14: Main Frame

    Disassembly Instruction Loosen the seven screws fastening the OPE unit. Carefully lift the OPE cover in the direction of the arrow as shown. Figure 4-5 Loosen the screw fastening the power supply and earth harness. Loosen the five screws fastening the main frame assembly.
  • Page 15 Disassembly Instruction Loosen the six screws fastening the LIU PBA and Power Supply unit. Lift the LIU PBA and Power Supply unit. Figure 4-7...

  • Page 16: Circuit Description

    The main circuit board consists of memory, MODEM, TX- and RX-related circuitry, TAD, and the Integrated Facsimile Controller (IFC), which includes the CPU and I/O device drivers and controls the system. This circuit consists of the data and address bus, real time clock (RTC), image sensor, motor driver controller, Thermal Print head controller, IFC including I/O port, and system reset circuit.

  • Page 17: System Clock

    Circuit Description The 6 MHz internal clock frequency is generated by dividing the 12 MHz system clock from with TSTCLK high, and an internal wait state MODEM by two inside the MODEM. occurs in the TSTCLK (6 MHz). These signals are sent to the /RD and /WR ports of RAM , ROM, and the MODEM in order to read or write data when a chip select line is active.

  • Page 18: Print Control

    Circuit Description minutes, seconds, year, month, and day. A battery maintains operation when power is off. This circuit receives clock pulses from an external 6 B I T 1 co=6~~~ co=6k[z SECONDS BUSY FLAG CLEAR BUSY FLAG 4 BIT 5 BIT MONTHS YEARS LEAP YEAR...
  • Page 19 Circuit Description voltage to the comparator with the thermistor input voltage (THDI), which originates as an output signal from the TPH. It then supplies the The ADC is composed of a 6 bit DAC, comparator, proper strobe pulse to the TPH. The thermistor filter, and 9 bit up/down counter.
  • Page 20 Circuit Description Communication A Synchronous/ Asynchronous Receiver/Transmitter (SART) controls serial data transmission between the main circuit board and the operator panel. CPU Bus Band Gen (8x) Figure 5-7: SART Block Diagram...

  • Page 21: Image Sensor

    Circuit Description compensates for shading distortion according to the CIS characteristics. The wave format from the The shading wave is formed by scanning the white image processor, and then processed in B/W or roller prior to a document. The slice level is intermediate mode.
  • Page 22 Circuit Description Processing to compensate for CIS shading distortion is controlled with MUXA ‘low’ and To process the B/W input signal, maximum ‘high, and MUXB ‘low’. For half-tone, MUXA is input signal are controlled by calibrating MUXA ‘low’, and MUXB is ‘high’. and MUXB in the high state for the maximum level, and setting them to earth for the minimum level.
  • Page 23 Circuit Description ACTIVE STATE (L) ACTIVE STATE (H) SPEAKER DISABLE SPEAKERENABLE RING DETECT MODEM TX PATH MODE DETECT SENSOR OPEN MODE DETECT SENSOR CLOSE GPO 3 GPO 4 MOTOR PHASE A GPO 5 MOTOR PHASE B GPO 6 MOTOR PHASE - A GPO 7 MOTOR PHASE - B...

  • Page 24: Power Monitor

    Circuit Description The SFllOT performs sending, receiving, and The key click consists of an 800 Hz tone of 20 ms printing functions utilising a single 24 volt motor. duration. This motor has a 150 ohm winding resistance. Three drive strobe pulses operate the motor. and serves to reset the MODEM, UART.
  • Page 25 Circuit Description System memory consists of 64kB ROM and 32kB RAM. Ail of RAM is backed up. ROM and RAM are selected by chip select lines, and data is accessed by the units position of the byte. These circuits control signal transmission between the internal MODEM and the LIU or a remote MODEM. The R96DFXL MODEM is a single-chip fax-MODEM having features to detect and generate DTMF tones.
  • Page 26 Circuit Description This circuitry controls transmission of analog In receive mode, analog signals from the LIU signals from the MODEM. Output voltage from board are transferred to RX IN through the BPF the MODEM is buffered through the LIU board and smoothing filter.

  • Page 27: Ring Detect

    Circuit Description The LIU (Line Interface Unit) interfaces the MODEM and telephone to the telephone line. The FAX and telephone portions of the LIU are active with machine power on. When machine power is off, only the telephone circuitry operates, powered by telephone line voltage. The FAX portion of LIU consists of the interface between MODEM and telephone line, and the circuits for DC loop feeding, DP signal, loop current, and ring detect.

  • Page 28: Ringer Circuit

    Circuit Description Current Sense Input). RINGER CIRCUIT When a ringing voltage is sensed on the line, Dial pulses originate at U201 pin 27 (DPn), path. When operating voltage is reached, the which toggles Q205, driving Q201. The resulting oscillator starts and U201 detects the ring intermittent voltage interrupts the telephone frequency.
  • Page 29 Circuit Description Refer to OPE Circuit and Block Diagrams. Signals from the key matrix are delivered to U300 X/Y input pin group @‘l-X). Connector P4 is NPO (No Power Operation) key matrix output. Display from controller is received at U300 pin 5 (TX DATA). LCD drive signals are U300 P2-X pin group, connector pin P2-1 - P2-3.

  • Page 30: Troubleshooting

    Plug in the power cord Load document in Push ‘START Key feeder Call machine from another phone...
  • Page 31 Troubleshooting...

  • Page 32: Check Power Supply

    Troubleshooting Check AC socket Connect as required Notify customer Check Cl2 Voltage Replace Cord Replace Fuse Replace Fuse Check Ul output Check Ul waveform d waveform Replace Ul Remove short...
  • Page 33 Troubleshooting Check Check CON 1 Replace U2 Check PCB Pattern Check CON1 Replace U3 Check PCB Pattern...
  • Page 34 Troubleshooting Check Remove short Replace D4 Check CON1 Check PCB Pattern Replace U4 Remove short Replace D3 Check CON1...
  • Page 35 Troubleshooting Doesn’t output Remove short Electronics...
  • Page 36 Troubleshooting Start Check Replace U3 Voltage detector IC Replace Clock Ul-133 Clock UlO-69 Xl XTAL...
  • Page 37 Troubleshooting Continued...
  • Page 38 Start Replace D-DET PBA See Section 6-2 Replace Ul...
  • Page 39 Troubleshooting Reloading Document Replace Main PBA See Section 6-2 Replace Ul Replace U2 Replace Ul Replace U4...
  • Page 40 Troubleshooting Continued See Section 6-2 Replace CIS...
  • Page 41 Troubleshooting Speaker On Replace main board Replace Mic. Replace U20 Replace speaker...
  • Page 42 Troubleshooting Call machine from other phone...
  • Page 43 Troubleshooting Start Call machine from another phone Replace Ul Replace LIU board...
  • Page 44 Troubleshooting Lift handset from Check hook switch in CONN board Replace main board...
  • Page 45 Troubleshooting machine Call fax Machine to Auto Answer ? Replace: Main Board “Manual Receive...

  • Page 46: No Dial Tone

    Troubleshooting Press check service at Request Telephone Lift Handset Service Check I Replace: Main Board U2 Check/Replace: Hook Switch...
  • Page 47 Troubleshooting Start Dial Receiving Load document Machine...

  • Page 48: Electrical Parts List

    Capacitor / Resistor tolerance: Description SEC Code Remark Ceramic, Chip, 680 pF, J, 50 V Ceramic, Chip, 680 pF, J, 50 V Ceramic, Chip, 680 pF, I Ceramic, Chip, 680 pF, Ceramic, Chip, 100 pF, J, 50 V Ceramic, Chip, 100 pF, J, 50 V Ceramic, Chip, 680 pF, J, 50 V Ceramic, Chip, 680 pF, J, 50 V Ceramic, Chip, 100 nF, Z, 50 V...
  • Page 49 Electrical Parts List...
  • Page 50 Electrical Parts List Ceramic, Chip, 680 pF, J, 50 V Ceramic, Chip, 100 nF, Z, 50 V Ceramic, Chip, 100 nF, Z, 50 V Ceramic, Chip, 100 nF, Z, 50 V...
  • Page 51 Electrical Parts List Ref. No. Description SEC Code Remark Ceramic, Chip, 100 nF, Z, 50 V Ceramic, Chip, 100 nF, Z, 50 V Ceramic, Chip, 100 nF, Z, 50 V Header, Box, 12 Pin Header, Box, Header, 3 Wall, 10 Pin Header, 3 Wall, 12 Pin Header, 3 Wall, 8 Pin Header, 3 Wall, 6 Pin...
  • Page 52 Electrical Parts List Description Ref. No. SEC Code Remark Audio amp, MC34119 CMOS Logic, 74HC245 CMOS Logic, 74HC32 CMOS Logic, 74HCOO DRAM, 44C1000,lM x 4 bit Chip, 10 kohm, J, l/10 W Chip, 10 kohm, J, l/10 W Chip, 10 kohm, J, l/10 W Chip, Chip, 10 kohm, J, l/10 W Chip,...
  • Page 53 Electrical Parts List Chip, 39 kohm, J, l/10 W Chip, 7.5 kohm, J, l/10 W Chip, 6.2 kohm, J, l/10 W Chip, 1.2 kohm, J, l/low Chip, 330 kohm, J, l/10 W Chip, 330 kohm, J, l/10 W Chip, 220 ohm, J, l/10 W Chip, 1 Mohm, J, l/10 W...
  • Page 55 Description Remark Ref. No. SEC Code Chip, 33 kohm, J, 1 /lO W Chip, 15 kohm, Chip, 220 ohm, J, l/10 W Small Signal, KSAll82, PNP Small Signal, KSC2982, NPN Small Signal, KSC5019, NPN Small Signal, KSAll82, PNP Small Signal, KSAll82, PNP Chip, 0 ohm, Resistor, Chip, 0 ohm, J, l/10 W Crystal, 0.032768M...
  • Page 56 ohm, J, l/8 W Chip, 0 ohm, J, l/8 W I Chip, 22 kohm, T,1/8 W Chip, ohm, J, l/8 W...
  • Page 57 Small Signal, NPN, KSA1182-Y Small Signal, NPN, KSA1182-Y Small Signal, NPN, KSA1182-Y Harness, Wire Connector, Header, 3.Wall,2 Pin Harness, Wire...
  • Page 58 Ref. No. I Description Assembly, HOOK I PCB, Blank, HOOK Switch, Hook, 48 V, 200 mA Connector, Header, 11 Pin I Pl Ref. No. Assembly, D.DET Interrupter Ref. No. 1 Description Assembly, P.EMPTY Switch, Detector Harness, Wire...
  • Page 59 Ref. No. 1 Description ASSEMBLY, HANDSET PCB Diode, Zener, lN4736A Audio, Receiver...
  • Page 60 Electrical Parts List Location No Description Part No Vendor SEC Code Transistor, NPN DIP 8Pin Photo Coupler SHARP Diode-Bridge 1 kV, 1 A, 75 ns PHILIPS Diode-FIX PHILIPS Diode-SW Diode-SW 1 W,27V...
  • Page 61 Electrical Parts List Description Part No Vendor SEC Code PHILIPS ZAP-X, PHILIPS-KOREA Z-CERAMIC Z-CERAMIC CAP-Y, C-CERAMIC C-ELECTROLYTIC C-CERAMIC 1 kV, 100 pF C-CERAMIC C-ELECTROLYTIC C-MYLAR C-MYLAR C-ELECTROLYTIC C-ELECTROLYTIC C-ELECTROLYTIC C-ELECTROLYTIC C-ELECTROLYTIC...
  • Page 62 Electrical Parts List Vendor Location No Description Part No SEC Code C-ELECTROLYTIC C-ELECTROLYTIC C-ELECTROLYTIC C-ELECTROLYTIC C-CERAMIC C-CERAMIC R-VARIABLE MATSUSHITA BECKMAN R-CARBON R-METAL OXIDE R-METAL OXIDE R-METAL OXIDE R-CARBON R-WIRE WOUND 1 w, 0.15 Q, 1% R-CARBON R-METAL OXIDE R-METAL OXIDE R-METAL OXIDE R-CARBON R-CARBON...
  • Page 63 Electrical Parts List Part No Vendor SEC Code Location No Description R-CARBON R-CARBON R-CARBON R-CARBON R-METAL OXIDE 2 W, 820 52‘5 % R-CARBON R-CARBON R-METAL OXIDE R-CARBON FINE COIL FINE COIL COIL FINE FINE BEAD BEAD BEAD Surge Absorber Thermistor Relay, Fuse Glass TRIAD...

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