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Samsung SF700AT Service Manual

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SERVICE
FACSIMILE
FACSIMILE
SF700AT
Manual
7. Electrical Parts List
9. PCB Diagrams
10. Block Diagram
11. Wiring Diagram
12. Schematic Diagrams
CONTENTS

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Summary of Contents for Samsung SF700AT

  • Page 1: Table Of Contents

    FACSIMILE SF700AT SERVICE Manual FACSIMILE CONTENTS 1. Precautions 2. Specification 3. Operating Instructions 4. Disassembly and Reassembly 5. Circuit Description 6. Troubleshooting 7. Electrical Parts List 8. Exploded Views and Parts List 9. PCB Diagrams 10. Block Diagram 11. Wiring Diagram...
  • Page 2 ELECTRONICS Samsung Electronics Co.,Ltd. APR. 1998. Printed in Korea. JF68-60A...

  • Page 3: Precautions

    6. Observe the original lead dress, especially near sharp edges, AC, and high voltage power supplies. Always inspect for pinched, out-of- place, or frayed wiring. Do not change the spacing between components and the printed circuit board. SF700AT...
  • Page 4 There could be a danger of explosion should not be opened, crushed, or burned for and subsequent operator injury and/or disposal. equipment damage if incorrectly installed. 2. Be sure to replace the battery with the same or equivalent type recommended by the manufacturer. SF700AT...

  • Page 5: Specification

    B4/A4 x 30 m, core 12.7 mm diametre Effective Recording Width 252 mm Recording Method Thermal recording with solid state Thermal Printing Head Resolution Horizontal 203 pels/in (8 dots/mm) Vertical Super Fine 3.85 lines/mm Fine 7.7 lines/mm Standard 15.4 lines/mm SF700AT...
  • Page 6 10 memory dial (power on) Power Requirement Check Power Label attached near the power outlet °F (10 °C to 35 °C) Temperature 50 to 95 Relative Humidity 20 to 80 % RH (Non-Condensing) Dimension 305 X 116 X 243 mm Weight 3.9 Kg SF700AT...

  • Page 7: Operating Instructions

    Select the number of rings the machine allows before it answers a call in automatic receiving Choose YES to turn on this feature. The LCD mode. display asks to enter the telephone number you want to be transferred. Choose NO to turn off the feature. SF700AT...
  • Page 8 0 and -15 dBm in 1 dB steps using the control fail to recognize a double digit code. panel keypad. Accuracy is + 0 /-3 dBm. Enter the characters you want to use, then press START. SF700AT...
  • Page 9 This feature allows you to change the recall time. BUSY TONE DETECTION LEVEL While checking tone in ANS/FAX mode, If any signal which is great than set level is detected for a few seconds the machine will disconnect the line. SF700AT...

  • Page 10: Test Mode

    Erases contents of RAM. When memory is cleared, DTMF TEST the machine returns to default settings. The machine tests its DTMF (Dual Tone Multi Frequency). When you press any key on the keypad, including and #, you will hear the corresponding key tone. SF700AT...
  • Page 11 HELP LIST RECEPTION JOURNAL This report illustrates the machine's basic functions and commands. Use as a quick reference Shows information about faxes received. guide. TELEPHONE NUMBER LIST Lists all numbers stored in the machine's one- touch and speed dialling memory. SF700AT...

  • Page 12: Lcd Display

    POST-MESSAGE ERROR: problem occurred during phase D of session LINE ERROR: machine cannot connect or has lost connection with the remote machine Additional messages, not shown above, will appear in the transmission and reception journals printed in service mode. SF700AT...

  • Page 13: Disassembly And Reassembly

    2. Remove the the six screws. 3. Remove the Main Chassis. Figure 4-1 4-2 Main PBA and LIU PBA 1. Loosen the six screws fastening the base. 2. Unplug the connector from the PBAs 3. Remove the MAIN PBA and LIU PBA. Figure 4-2 SF700AT...

  • Page 14: Top Cover

    1. Loosen the six screws fastening the base. 2. Remove the Sensor PBA and Power. Figure 4-3 4-4 Top Cover 1. Open the operation panel and RX-Cover. Loosen the three screws fastening the top cover. Lift the top cover carefully. Figure 4-4 SF700AT...

  • Page 15: Rear Cover

    1. Loosen the four screws fastening the rear cover. 2. Remove the Rear Cover. Figure 4-5 4-6 RX Cover 1. Hold the wire spring as shown in figure 4-6. 1. Remove the bushing. 3. Lift RX cover assembly, while pulling in the direction of arrow. Figure 4-6 SF700AT...
  • Page 16 1. Hold the bushing as shown in figure 4-7. Remove the roller assembly from the bushing with screwdriver. 2. Lift roller assembly, while pulling in the direction of arrow. Figure 4-7 4-8 CIS 1. Lift the CIS assembly. 2. Unplug the connector. Figure 4-8 SF700AT...
  • Page 17 1. Loosen the three screws. 2. Lift the OPE assembly. Figure 4-9 4-10 Cutter Assembly 1. Loosen the two screws fastening the Base. 2. Remove the cover cutter. 3. Loosen the two screws fastening the Base. 4. Lift the cutter. Figure 4-10 SF700AT...
  • Page 18 Disassembly and Reassembly 4-11 TX, RX Motor 1. Loosen the two screws fastening the Base. (Rx motor assÕy) TX Motor assÕy RX Motor assÕy 2. Loosen the two screws fastening the Base. (Tx motor assÕy) Figure 4-11 SF700AT...

  • Page 19: Circuit Description

    CS2n - CS4n 00FD00 00FDFF CS4n 00FDC0 CS1n 00FC00 Available CS3n 00FD80 CS2n Internal 0FFFFF 00FD00 Memory CS0n 00FBFF 00E000 Reserved 000000 00FBE0 Shading Inversion 00FBD0 DBCMC Buffer 00FBC0 Dither Table 00FB80 Reserved 00E000 Figure 5-1: XFC-B Memory Map SF700AT...
  • Page 20 SENSORS A0~A16 THADI IFC(XFC-B) /RD/WR MOTOR D0~D7 SM 0~3 A0~A4 DRIVER MOTOR POS MODEM /MCS (MOTOR) /MIRQ SYSCLK /PWRDWN /RESET START /BATRST SCLK VIDCTL1 SCANNER CONTROL GENERAL PURPOSE PROCESSING I/ 0 +Vref -Vref Figure 5-2: XFC-B Hardware Interface Signals SF700AT...

  • Page 21: Print Control

    PDAT. STB0 - STB3 enable TPH printing in four sequential intervals. Print Print PrintLine (MSINT Cary-out) Sh D Sh C Sh D Sh C Shift Data Shift Clk STB0 STB1 2 DotClk Delays 2 DotClk Delays STB2 5 DotClk Delays STB3 Figure 5-4: Printer Timing SF700AT...
  • Page 22 Figure 5-5: Thermal ADC Block Diagram THD1 Rt (T) Thermal printhead thermistor Ground Approximate values of R28 and R29 can be calculated from the following formulas: R28=0.25*[R29*rT(T1)]/[R29+Rt(T1)] R29=[15Rt(T1)*Rt(T2)]/[Rt(T1)-16Rt(T2)] where T1=minimum temperature, T2=maximum temperature. Figure 5-6: THDI/Thermal Printer Head Connection Circuit SF700AT...
  • Page 23 Receiver/Transmitter (SART) controls serial data transmission between the main circuit and the operator panel. CPU Bus SclkCtrlLo SclkCtrlHi SartlRQ Band Gen (8x) SCLK Tx/Rx Control IRQ control SARTCmd RxShift Reg (SARTData) RxBuffer (SARTData) TxShift Reg Internal Register Figure 5-7: SART Block Diagram SF700AT...
  • Page 24 Inversion Table Enabled (ShTblEnb) Buffer IF (DMA Channel 1) Scan Data Shading Enabled (ShadeEnb) Bi-level B4 to A4 Edge Enhancement Enabled (EdgeEnhEnb) Reduction Dynamic Background and Contrast Control Enabled (DBCCEnb) Primary Paths Secondary (optional) Paths Figure 5-8: Scanner Image Processing Block Diagram SF700AT...
  • Page 25 The CIS driver clock frequency is 500 kHz. A low clock and taking B4 paper size into consideration. duty cycle of 50% is used to lengthen the charging 500 KHZ (L:DUTY 50 %) CLOCK 1 LINE Figure 5-10: CIS Driver Clock Timing SF700AT...
  • Page 26 RX Motor Phase A OFF GP01/PM1 RX Motor Phase B ON RX Motor Phase B OFF GP02.PM2 /PMA RX Motor Phase -A ON RX Motor Phase -A OFF GP03/PM3 /PMB RX Motor Phase -B ON (ONLY 0) RX Motor Phase -B OFF SF700AT...
  • Page 27 The key click consists of an 800 Hz tone of 20 ms receiving, and printing functions utilising a two 24 duration. volt motor. These motor has a winding resistance of 120 ohm. /RESET drives MODEM /POIR and serves to reset the MODEM. /MIRQ is the MODEM interrupt signal. SF700AT...
  • Page 28 BATTERY POWER RESET configuration, and is connected to PFC through a 10k pull-up resistor. When battery power (V ) is applied to IFC the first time, V current results in /BATRST going 'low', causing a reset to occur. 5-10 SF700AT...
  • Page 29 GP 13 N.C. GP 16 /PJAM (ONLY I) PAPER JAM GP 17 (ONLY I) GP 19 DIAL_MODE_IN DP DIALING MODE (ONLY I) DTMF DIALING MODE GP 20 N.C. (ONLY I) GP 21 N.C. (ONLY I) Table 5-14: I/O Port SF700AT 5-11...
  • Page 30 CODEC 1 are stored in the voice memory (U21) through the DSPG DRAM controller. +5V is supplied for the voice memory through VBT when power is on. When power is off, +5V is supplied from the battery. 9V Lithum battery is used for backup battery. 5-12 SF700AT...
  • Page 31 ¥ BD2: telephone line polarity matching (This Gain is amplified by U16: 4051 circuit) ¥ VAR2, 3: 82V voltage regulator ¥ R44, R45: Vgs bias voltage regulator ¥ C39: voltage stabilization ¥ R46: DC resistance adjustment. ¥ K2: dial pulse generator SF700AT 5-13...
  • Page 32 ¥ Pulse M/B ratio is set by U2 pin 6. =33:66, and V =40:60. ¥ Optical coupler U6 inhibits manual dial when +5V is applied to pin 1 by carthing Q1 base, driving U2 pin 5 high. This prohibits manual dialling during FAX auto-dial. 5-14 SF700AT...
  • Page 33 ¥ LCD drive signals are U1 P20~P27, P33~P35 pins. ¥ Machine status LED drive signals are U1 P00~P02, P04~P06 pins. Main mic Input 16 x 1 lines Circuit MICOM Z-8601 Key Matrix UART Reset Connector LEDs Figure 5-13 OPE Block Diagram SF700AT 5-15...
  • Page 34 Circuit Description MEMO 5-16 SF700AT...

  • Page 35: Troubleshooting

    See 6-5 Call machine from Copy OK ? OGM Recording OGM play back ? another phone See 6-6 See 6-7 Manual ICM Recoding ? Auto Answer ? RX OK ? operation ? See 6-8 See 6-9 See 6-10 See 6-11 SF700AT...
  • Page 36 Troubleshooting Hook off using Speaker Dial tone OK ? TX OK ? handset phone call See 6-12 See 6-13 Speakerphone operating ? See 6-14 SF700AT...
  • Page 37 2. Plug in machine good ? supply Measure on the Measure on the +5 V ? CONN board OPE board Check harness OK ? Replace harness Replace OPE board +5 V ? and LCD module Check harness OK ? Replace harness SF700AT...
  • Page 38 LCD module Replace main board 6-3. System Not Initialized Check system reset Start (U1 Pin 131) in Logic 'H' ? Replace OPE board main board Check Vcc from P5-7 to P5-8 ≥ 4.5 V ? See 6-2 Replace main board SF700AT...
  • Page 39 LOADING' loading main board displayed ? Replace Doc Sensor board Document fed ? Replace power +24 V OK ? supply Check motor pulse (P1- 11, 13, 15, 17) in main board OK ? Replace main board Replace motor ass'y SF700AT...
  • Page 40 Document fed ? Press START key Start feeder See 6-4 Check +5V, -12V CIS LED lights OK ? from P5-8, 10 to P5-7, 9 OK ? Replace power Check CIS from supply P4-9 Replace CIS Low ? Replace main board SF700AT...
  • Page 41 Load document in Document fed ? Press START key Start feeder See 6-4 Check motor pulse (P1- CIS LED on ? Copy produced ? 11, 13, 15, 17) in main board See 6-5 Replace motor OK ? ass'y Replace main board SF700AT...
  • Page 42 Troubleshooting Copy quality Copy all black ? Copy all white ? OK ? TPH test OK ? Replace TPH Copy quality Replace main Replace CIS OK ? board SF700AT...
  • Page 43 Speaker On Check Check Replace main Mic signal from signal from board CN3-6, 8? U16-pin4 Check Check signal CONN B'd Replace Mic. signal from from P22-1, 2? U16 pin 4? Check signal from Replace OPE CN14-1, 2? board Replace speaker SF700AT...
  • Page 44 Troubleshooting 6-8. ICM Not Recording Start Call machine Recording Check LIU board from other phone mode ? OK ? ICM Playback ? Replace main Replace LIU board board 6-10 SF700AT...
  • Page 45 Troubleshooting 6-9. Malfunction in Auto Answer Start Call machine from Auto answer ? another phone Check signal on U7 pin3 in LIU board Check Hook switch Replace main OK ? board Replace Hook switch board SF700AT 6-11...
  • Page 46 6-10. Malfunction in Manual Receiving Start Lift handset from fax then press START Machine goes on-line ? Check hook switch in CONN board OK ? Check LIU board OK ? Replace LIU board Replace CONN Replace main board board 6-12 SF700AT...
  • Page 47 Start Call fax machine Auto answer ? Receive data ? See 6-9 Check Tx/Rx signal Check telephone OK ? from CN13-2, CN13- line 4 in main board Test customer Signal OK ? Replace LIU board Replace main board SF700AT 6-13...
  • Page 48 Troubleshooting 6-12. No Dial Tone Lift handset from Start Dial tone OK ? Replace LIU board fax machine Dial tone OK ? Replace CONN board Dial tone OK ? Replace main board 6-14 SF700AT...
  • Page 49 Troubleshooting 6-13. Malfunction in Transmission Start Load document in Call receiving Document fed ? Press START key feeder machine See 6-4 Start transmitting ? Replace LIU board OK ? Replace main board SF700AT 6-15...
  • Page 50 Troubleshooting 6-14. Speakerphone Does Not Work Start Speaker on Dial tone OK ? See 6-12 Check Tx/Rx signal from CN14-1, 2 Replace Main LCD display ? board 6-16 SF700AT...
  • Page 51 Troubleshooting Speaker On Check Check Replace main Mic signal from signal from board CN3-8 CN14-1, 2 Check Check Replace Mic. signal from OPE board CN14-1, 2 Replace OPE board Replace speaker SF700AT 6-17...

  • Page 52: Exploded Views And Parts List

    8. Exploded Views and Parts Lists 8-1. Total Assembly SF700AT...
  • Page 53 ELA-WHITE ROLLER JF96-01225A PMO-COVER REAR JF72-41602A PMO-COVER TOP JF72-41603A ELA HOU-BASE JF96-01282A Boards Excluded PMO-HOLDER ADF JF72-41598A RMO-RUBBER ADF JF73-40518A NPR-SPRING PS ADF JF71-10513A SCREW, TAPTITE, BH, +, B, M3. L8 6003-000015 SCREW, TAPTITE, PH, +, B, M3, L10 6003-000159 SF700AT...
  • Page 54 Exploded Views and Parts Lists 8-2. Ass'y OPE Unit SF700AT...
  • Page 55 MPR-SHEET COLOR(A) JF74-10513A PMO-KEY SET(A) JF72-41592A PMO-KEY ONE TOUCH JF72-41591A PMO-KEY TEL JF72-41587A RMO-RUBBER CON(B) JF73-40520A RMO-ROBBER CON(A) JF73-40519A PBA, SUB KBD-SF700AT JF92-00786B RMO-RUBBER MIC JF73-40501A PMO-FRAME FRONT JF72-41596A MEC-PINCH ROLLER JF75-11005A PMO-FRAME HINGE JF72-41597A MEC-ANTI BRUSH JF75-11001A IPR-PLATE HINGE JF70-10867A SCREW, TAPTITE, PWH, +, B, M2.5, L6...
  • Page 56 Exploded Views and Parts Lists 8-3. Ass'y RX COVER SF700AT...
  • Page 57 JF72-41619A ICT-SPRING LOCK(R) JF70-40572A PRINT HEAD-THERMAL JF47-30068A IPR-GUIDE TPH(R) JF70-10877A PMO-FRAME DECURL JF72-41608A ICT-SHAFT DECURL JF70-40568A SCREW, TAPTITE, PWH, +, B, M3, L6 6003-000264 SCREW, TAPTITE, PH, +, B, M3, L10 6003-000159 SCREW, MACHINE, BH, +, M3, L4 6001-000125 SF700AT...
  • Page 58 Exploded Views and Parts Lists 8-4. PLATEN ROLLER Location No. Description SEC. Code Q'ty Remark PMO-BUSHING WHITE JF72-41609A NPM-BUSHING SHAFT(2) JF71-50514A MEC-PLATEN ROLLER JF75-10779A PMO-GEAR PLATEN JF72-41614A SF700AT...
  • Page 59 Exploded Views and Parts Lists 8-5. ASS’Y WHITE ROLLER Location No. Description SEC. Code Q'ty Remark ELA-WHITE ROLLER JF96-01225A PMO-BUSHING WHITE JF72-41609A MEC-WHITE ROLLER JF75-10781A PMO-GEAR WHITE JF72-41630A SF700AT...
  • Page 60 Exploded Views and Parts Lists 8-6. ASS’Y ADF ROLLER Location No. Description SEC. Code Q'ty Remark ELA-ADF ROLLER JF96-01224B MEC-ADF ROLLER JF75-10780A ICT-SPRING CLUTCH JF70-40561A PMO-SLEEVE ADF(1) JF72-41616A ICT-SHAFT ADF JF70-40569A ICT-PIN JF70-40570A SF700AT...
  • Page 61 Exploded Views and Parts Lists 8-7. Ass'y Base 8-10 SF700AT...
  • Page 62 ELA-MOTOR PLATE TX JF96-01210A PMO-GUIDE ROLL JF72-41613A PMO-HOLDER SPEAKER JF72-41604A PMO-COVER BASE JF72-41601A PMO-BOX BATT JF72-41624A NPR-GROUND PLATE(B) JF71-10517A PBA, SUB OPTIC-SF700AT JF92-00797B SPEAKER 3001-001026 CBF-HARNESS, MAIN-SPK JF39-41047A PMO-ACTUATOR P.SIZE JF72-41612A PBA, SUB OPTIC-SF700AT JF92-00796B SMPS, JUST-V2 JF44-10064A CBF-POWER CORD, 1830 mm...
  • Page 63 Exploded Views and Parts Lists 8-8. Harness 8-12 SF700AT...
  • Page 64 CBF-HARNESS, LIU-OPE JF39-41048A CBF-HARNESS, MAIN-OPE JF39-41045A CBF-HARNESS, MAIN-TPH JF39-41046A CBF-HARNESS, PJAM JF39-41054A MES-AUTO CUTTER JF75-10784A SMPS, JUST-V2 JF44-10064A CALBE-FLAT 3809-001042 CBF-HARNESS, MAIN-BAT JF39-41076A CBF-HARNESS, SCAN/DOC JF39-41043A CBF-HARNESS, P’EMPTY JF39-41044A MOTOR-STEP 3101-001018 MOTOR-STEP 3101-001017 CBF-HARNESS, MAIN-SPK JF39-41047A CBF-HARNESS, MAIN-LIU JF39-41075A SF700AT 8-13...

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