Panasonic KX-FT901CX-B Service Manual
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Panasonic KX-FT901CX-B Service Manual

Panasonic KX-FT901CX-B Service Manual

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IMPORTANT INFORMATION ABOUT LEAD FREE, (PbF), SOLDERING
If lead free solder was used in the manufacture of this product the printed circuit boards will be marked PbF.
Standard leaded, (Pb), solder can be used as usual on boards without the PbF mark.
When this mark does appear, please read and follow the special instructions described in this manual on the use of PbF and how
it might be permissible to use Pb solder during service and repair work.
KX-FT901CX-B
KX-FT903CX-B
KX-FT901CX-W
KX-FT903CX-W
KX-FT901CX-S
KX-FT903CX-S
(Black Version)
(White Version)
(Silver Version)
(for Asia and Middle Near East )
© 2004 Panasonic Communications Co., Ltd. All
rights
reserved.
distribution is a violation of law.
ORDER NO. KMF0405779C3
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  • Page 1 When this mark does appear, please read and follow the special instructions described in this manual on the use of PbF and how it might be permissible to use Pb solder during service and repair work. © 2004 Panasonic Communications Co., Ltd. All rights reserved.

  • Page 2: Table Of Contents

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S CONTENTS Page Page 1 INTRODUCTION 7.5. TROUBLESHOOTING DETAILS 1.1. ABOUT LEAD FREE SOLDER (PbF: Pb free) 8 CIRCUIT OPERATIONS 1.2. SAFETY PRECAUTIONS 8.1. CONNECTION DIAGRAM 1.3. INSULATION RESISTANCE TEST 8.2.

  • Page 3: Introduction

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 1 INTRODUCTION 1.1. ABOUT LEAD FREE SOLDER (PbF: Pb free) Note: In the information below, Pb, the symbol for lead in the periodic table of elements, will refer to standard solder or solder that contains lead.
  • Page 4 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 1.1.2. HOW TO RECOGNIZE THAT Pb FREE SOLDER IS USED P.C.Boards marked as “PbF” use Pb Free solder. (See the figure below.) Pb Free is not used the Power Supply Board of this unit.

  • Page 5: Safety Precautions

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 1.2. SAFETY PRECAUTIONS 1. Before servicing, unplug the AC power cord to prevent an electric shock. 2. When replacing parts, use only the manufacturer´s recommended components. 3. Check the condition of the power cord. Replace if wear or damage is evident.

  • Page 6: Ac Caution

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 1.6. AC CAUTION For safety, before closing the lower cabinet, please make sure of the following precautions. 1. The earth lead is fixed with the screw. 2. The AC connector is connected properly.

  • Page 7: Service Precautions

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 1.7.2. LIVE ELECTRICAL SECTIONS All the electrical sections of the unit supplied with AC power by the AC power cord are live. Never disassemble the unit for service with the AC power supply plugged in.

  • Page 8: Features And Specifications

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 2 FEATURES AND SPECIFICATIONS 2.1. FEATURES General · Help function Display: − − − − HOW TO SET UP − − − − DIRECTORY − − − − AUTO ANSWER −...

  • Page 9: Specifications

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 2.3. SPECIFICATIONS Applicable Lines: Public Switched Telephone Network Document Size: Max. 216 mm in width Max. 600 mm in length Effective Scanning Width: 208 mm Recording Paper Size: 216 mm × max. 30 m roll...

  • Page 10: Installation

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 3 INSTALLATION 3.1. LOCATION OF CONTROLS 3.1.1. FRONT VIEW (1) Speaker (2) Document guides (3) Document feeder tray (4) Paper stacker (KX-FT903CX ONLY) The paper stacker may not be shown in all illustrations in this operating instructions.

  • Page 11: Control Panel

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 3.1.2. CONTROL PANEL programming. (1) [TONE] · To change from pulse to tone temporarily during dialling · To navigate to the next operation. when your line has rotary pulse services..

  • Page 12: Connections

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 3.2. CONNECTIONS (1) Handset cord. (2) Telephone line cord. (3) Power cord (220-240 V, 50/60 Hz). (4) Paper stacker (KX-FT903CX ONLY) (5) [EXT] jack (6) Extension telephone (not included) Caution: ·...

  • Page 13: Installation

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 3.3. INSTALLATION 3.3.1. INSTALLATION SPACE The space required to install the unit is shown below. The dimensions given are necessary for the unit to operate efficiently. Note: · Avoid excessive heat or humidity.

  • Page 14: Recording Paper

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 3.3.3. RECORDING PAPER Open the cover by pressing the cover open button ( Close the cover securely by pushing down on. KX-FT901CX Install the recording paper. Tear off the excess paper by pulling it towards you.
  • Page 15 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 3.3.4. DOCUMENTS THE UNIT CAN FEED Note: · Remove chips, staples or other similar fasteners. · Do not send the following types of documents. (Use the scanner glass for fax transmission.) —...

  • Page 16: Setting Your Logo

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 3.3.5. SETTING YOUR LOGO The logo can be your company, division or name. To enter your logo Example: “BI LL” 1. Press [2] 2 times. 2. Press [4] 3 times.
  • Page 17 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 3.3.5.1. TO SELECT CHARACTERS WITH THE DIAL KEYPAD Pressing the dial keys will select a character as shown below. To select characters using Instead of pressing the dial keys, you can select characters using 1.

  • Page 18: Maintenance

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 4 MAINTENANCE 4.1. MAINTENANCE ITEMS AND COMPONENT LOCATIONS 4.1.1. OUTLINE MAINTENANCE AND REPAIRS ARE PERFORMED USING THE FOLLOWING STEPS. 1. Periodic maintenance Inspect the equipment periodically and if necessary, clean any contaminated parts.
  • Page 19 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 4.1.2.1. MAINTENANCE LIST OPERATION CHECK REMARKS Document Path Remove any foreign matter such as paper. — Rollers If the roller is dirty, clean it with a damp cloth then dry Refer to DOCUMENT FEEDER (P.21).

  • Page 20: Jams

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 4.2. JAMS 4.2.1. RECORDING PAPER JAMS When the recording paper has jammed in the unit The display will show the following. Open the cover by pressing the cover open button ( Install the recording paper and close the cover securely by pushing down on both sides.

  • Page 21: Cleaning

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 4.2.2. DOCUMENT JAMS - SENDING 4.3. CLEANING Open the cover by pressing the cover open button ( ) and 4.3.1. DOCUMENT FEEDER remove the jammed document carefully ( Clean the document feeder when: - Documents frequently misfeed.

  • Page 22: Thermal Head

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 4.3.2. THERMAL HEAD If smudges or black/white lines appear on a copied/received document, check whether there is dust on the thermal head and head cover. Clean them to remove the dust.

  • Page 23: Disassembly Instructions

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 5 DISASSEMBLY INSTRUCTIONS 5.1. DISASSEMBLY FLOW CHART 5.1.1. UPPER CABINET SECTION CROSS REFERENCE: A-1 : HOW TO REMOVE THE PAPER STACKER (KX-FT903 ONLY) (P.25) A-2 : HOW TO REMOVE THE OPERATION PANEL BLOCK (P.26) A-3 : HOW TO REMOVE THE OPERATION BOARD AND LCD (P.27)

  • Page 24: Lower Cabinet Section

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 5.1.2. LOWER CABINET SECTION CROSS REFERENCE: A-1 : HOW TO REMOVE THE PAPER STACKER (KX-FT903 ONLY) (P.25) A-2 : HOW TO REMOVE THE OPERATION PANEL BLOCK (P.26) B-1 : HOW TO REMOVE THE BOTTOM FRAME (P.31) B-2 : HOW TO REMOVE THE HANDSET CRADLE CABINET AND SPEAKER (P.32)

  • Page 25: Disassembly Instructions

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 6 DISASSEMBLY INSTRUCTIONS 6.1. HOW TO REMOVE THE PAPER STACKER (KX-FT903 ONLY)

  • Page 26: How To Remove The Operation Panel Block

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 6.2. HOW TO REMOVE THE OPERATION PANEL BLOCK...

  • Page 27: How To Remove The Operation Board And Lcd

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 6.3. HOW TO REMOVE THE OPERATION BOARD AND LCD...

  • Page 28: How To Remove The Image Sensor

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 6.4. HOW TO REMOVE THE IMAGE SENSOR...

  • Page 29: How To Remove The Thermal Head And Cutter Unit

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 6.5. HOW TO REMOVE THE THERMAL HEAD AND CUTTER UNIT...

  • Page 30: How To Remove The Document Tray

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 6.6. HOW TO REMOVE THE DOCUMENT TRAY...

  • Page 31: How To Remove The Bottom Frame

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 6.7. HOW TO REMOVE THE BOTTOM FRAME...

  • Page 32: How To Remove The Handset Cradle Cabinet And Speaker

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 6.8. HOW TO REMOVE THE HANDSET CRADLE CABINET AND SPEAKER...

  • Page 33: How To Remove The Digital, Analog And Power Supply Board And Ac Inlet

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 6.9. HOW TO REMOVE THE DIGITAL, ANALOG AND POWER SUPPLY BOARD AND AC INLET...

  • Page 34: How To Remove The Rollers

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 6.10. HOW TO REMOVE THE ROLLERS...

  • Page 35: How To Remove The Motor Block

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 6.11. HOW TO REMOVE THE MOTOR BLOCK...
  • Page 36 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S CROSS REFERENCE: HOW TO REMOVE THE THERMAL HEAD AND CUTTER UNIT (P.29)
  • Page 37 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S...

  • Page 38: Installation Position Of The Lead Wires

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 6.12. INSTALLATION POSITION OF THE LEAD WIRES...

  • Page 39: Installation Of Thermal Head And Analog Board

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 6.13. INSTALLATION OF THERMAL HEAD AND ANALOG BOARD...

  • Page 40: Troubleshooting Guide

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7 TROUBLESHOOTING GUIDE 7.1. TROUBLESHOOTING SUMMARY 7.1.1. TROUBLESHOOTING After confirming the problem by asking the user, troubleshoot according to the instructions and observe the following precautions. 7.1.2. PRECAUTIONS 1. If there is a problem with the print quality or the paper feed, first check if the installation space and the print paper meets the specifications, the paper selection lever/paper thickness lever is set correctly, and the paper is set correctly without any slack.

  • Page 41: User Recoverable Errors

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.2. USER RECOVERABLE ERRORS If the unit detects a problem, one or more of the following messages will appear on the display. The explanations given in the [ ] are for servicemen only.

  • Page 42: Programming And Lists

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.3. PROGRAMMING AND LISTS The programming functions are used to program the various features and functions of the machine, and to test the machine. Programming can be done in both the on-hook and off-hook conditions. This facilitates communication between the user and the service while programming the machine.
  • Page 43 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.3.3. SERVICE FUNCTION TABLE Code Function Set Value Effective Range Default Remarks Setting the pause time 001~600 X 100 msec 001~600 Selects the pause time in 100 msec steps.
  • Page 44 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S Code Function Set Value Effective Range Default Remarks Setting the overseas DIS 1: Detects on the 1st 1, 2 Sets the recognition format of the DIS signal. detection time.2: Detects on the 1:Detects the first DIS signal sent from the 2nd time.

  • Page 45: Test Functions

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.4. TEST FUNCTIONS Test Mode Type of Mode Code Function Operation after code input PRINT TEST Service Mode “8” “5” Prints a test patten and checks the thermal head for abnormalities (missing dots, etc), and also checks the operation of the reception motor.(Refer to JOURNAL 3...

  • Page 46: Dtmf Single Tone Transmit Selection

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.4.1. DTMF SINGLE TONE TRANSMIT SELECTION When set to ON (=1), the 12 keys and transmission When set to OFF (=2), the 12 keys and transmission frequencies are as shown.

  • Page 47: Remote Programming

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.4.4. REMOTE PROGRAMMING If, after the call is connected, the customer describes the situation and it is determined that the problem can be corrected by making parameter changes, this function makes it possible to change parameters such as the user code and service code from another fax (using DTMF tones).
  • Page 48 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.4.4.2. PROGRAM MODE TABLE Code Function Set Value Default Remote setting Set the date and time mm/dd/yy AM/PM --------- Your logo --------- --------- Your fax number --------- --------- Print transmission report...
  • Page 49 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S Code Function Set Value Default Remote setting Friendly reception CNG detection select 1:10S/2:20S/3:30S T1 timer 1:35 sec/2:60 sec 35 sec T4 timer 00~99 X 100ms Sensor check Press "START".
  • Page 50 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.4.5. USER MODE (The list below is an example of the SYSTEM SETUP LIST the unit prints out.) 7.4.5.1. KX-FT901CX-B/W/S Note: The above values are the default values.
  • Page 51 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.4.5.2. KX-FT903CX-B/W/S Note: The above values are the default values.
  • Page 52 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.4.6. SERVICE MODE SETTINGS (Example of a printed out list) 7.4.6.1. KX-FT901CX-B/W/S...
  • Page 53 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.4.6.2. KX-FT903CX-B/W/S...

  • Page 54: Troubleshooting Details

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.5. TROUBLESHOOTING DETAILS 7.5.1. OUTLINE Troubleshooting guide provides a logical path of deduction to assist in locating a fault and suggests methods of restoring the unit to full working condition. Use the reported symptoms of the fault to determine the best troubleshooting method. Even difficult faults can be tracked to a specific block or area, for example, the "Digital Board"...
  • Page 55 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.5.3. TROUBLESHOOTING ITEMS TABLE FUNCTION SYMPTOM REFERENCE Printing Skewed receiving image See SKEWED RECEIVING IMAGE (P.61) Expanded print See EXPANDER PRINT (WHEN PRINTING) (P.62) Image is distorted See IMAGE IS DISTORTED (WHEN PRINTING) (P.60) Black or White vertical lines appear.
  • Page 56 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.5.4. ADF (AUTO DOCUMENT FEED) SECTION 7.5.4.1. NO DOCUMENT FEED CROSS REFERENCE: DIGITAL BOARD SECTION (P.82) POWER SUPPLY BOARD SECTION (P.96) SENSOR SECTION (P.100) TEST FUNCTIONS (P.45) DISASSEMBLY INSTRUCTIONS (P.25)

  • Page 57: Document Jam

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.5.4.2. DOCUMENT JAM CROSS REFERENCE: SENSOR SECTION (P.100) DISASSEMBLY INSTRUCTIONS (P.25)
  • Page 58 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.5.4.3. MULTIPLE FEED When using thick paper etc., If the document will not feed. CROSS REFERENCE: DISASSEMBLY INSTRUCTIONS (P.25)
  • Page 59 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.5.4.4. SKEW CROSS REFERENCE: DISASSEMBLY INSTRUCTIONS (P.25)
  • Page 60 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.5.4.5. IMAGE IS DISTORTED (WHEN PRINTING) CROSS REFERENCE: READ SECTION (P.100) THERMAL HEAD SECTION (P.102) TEST FUNCTIONS (P.45) DISASSEMBLY INSTRUCTIONS (P.25)
  • Page 61 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.5.4.6. BLACK OR WHITE VERTICAL LINES APPEAR CROSS REFERENCE: DIGITAL BOARD SECTION (P.82) TEST FUNCTIONS (P.45) 7.5.4.7. SKEWED RECEIVING IMAGE...
  • Page 62 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.5.4.8. EXPANDER PRINT (WHEN PRINTING) CROSS REFERENCE: DISASSEMBLY INSTRUCTIONS (P.25) 7.5.4.9. WHEN COPYING OR PRINTING, AN ABNORMAL SOUND IS HEARD FROM THE UNIT...
  • Page 63 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S CROSS REFERENCE: DISASSEMBLY INSTRUCTIONS (P.25) 7.5.5. COMMUNICATION SECTION Find the problem in the table shown below, and refer to the corresponding troubleshooting procedure in DEFECTIVE FACSIMILE SECTION (P.64). Symptom...
  • Page 64 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.5.5.1. DEFECTIVE FACSIMILE SECTION 7.5.5.1.1. TRANSMIT PROBLEM CROSS REFERENCE: ADF (AUTO DOCUMENT FEED) SECTION (P.56) OPERATION BOARD SECTION (P.99)
  • Page 65 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.5.5.1.2. SOMETIMES THERE IS A TRANSMIT PROBLEM...

  • Page 66: Reception Problem

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.5.5.1.3. RECEPTION PROBLEM Confirm the following before starting troubleshooting. Is the recording paper installed properly? There is the receiving problem when sometimes the below errors may be occurred. OUT OF PAPER CHHECK COVER UNIT OVERHEATED (If it doesn´t return automatically, COVER OPEN, etc., reset the unit.)
  • Page 67 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.5.5.1.4. THE UNIT CAN COPY, BUT CANNOT TRANSMIT/RECEIVE...
  • Page 68 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.5.5.1.5. UNIT CAN COPY, BUT CANNOT TRANSMIT/RECEIVE LONG DISTANCE OR INTERNATIONAL COMMUNICATIONS The following 2 causes can be considered for this. Cause 1: The other party is executing automatic dialling, the call has been received by this unit, and the CED or DIS signal response time is too long.
  • Page 69 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S (Causes and Countermeasures) Countermeasure Side Echo Communication Problem Example Countermeasure Service Code Sending side Some time is needed to compare the level Add a dummy signal to the beginning...
  • Page 70 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S Fig. c (Countermeasure by Changing the Interval Between CED and DIS) Fig. d (C3ountemeasure by Ignoring the 1st DIS) <TX side signal> <RX side signal> <Countermeasure> 2nd / 3rd DCS / Training &...
  • Page 71 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.5.5.1.7. HOW TO OUTPUT THE JOURNAL REPORT: 1. Press repeatedly until the following is displayed. 2. Press 3. Press until the “ JOURNAL REPORT ” is displayed. 4. The report is printed out.
  • Page 72 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S Countermeasure...
  • Page 73 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S...
  • Page 74 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S...
  • Page 75 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S...
  • Page 76 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S...
  • Page 77 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S...
  • Page 78 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S...
  • Page 79 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S...
  • Page 80 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.5.6. OTHER [HISTORY] Display Function DATA Date and time which are set by a user for the first time after purchase. TIME is the expiration from the first power on after purchase.
  • Page 81 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.5.7.1. JOURNAL 3 Descriptions: 1. ENCODE Compression Code: MH/MR 2. MSLT MSLT means Minimum Scan Line Time. Used only at the factory. 3. RESOLUTION (RESOL) Indicates the resolution of the communication. If multiple pages are transmitted or received, it indicates the last page´s resolution.

  • Page 82: Digital Board Section

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.5.8. DIGITAL BOARD SECTION One of most difficult problems to deal with is when the system will not boot up. The symptom: No response when the power is turned on. (No LCD display, keys are not accepted.) Note: 1.
  • Page 83 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.5.8.1. DIGITAL BLOCK DIAGRAM The signal lines that must be normal for the system to boot up For signal lines other than these, even if they malfunction they are listed here [List 1].
  • Page 84 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S...
  • Page 85 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S Normal Wave Patterns Remarks: When you use an oscilloscope to judge whether a signal to be tested is normal or NG, perform the signal check in exactly the same order as in [List 1]. (If the ASIC fails to access the ROM, the ASIC cannot access SRAM normally.) The digital circuit actually operates according to the timing combinations of these signals.
  • Page 86 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S Note: Simply check the output level and make sure if the IC repeatedly outputs the signal at between 3.3V (H) and 0V (L). I/O and Pin No. Diagram...
  • Page 87 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S...
  • Page 88 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S After the power is turned on, the ASIC (CPU) initializes and checks each IC. The ROM, SRAM, and Modem are checked. If initialization fails for the ICs, the system will not boot up.
  • Page 89 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.5.8.2. FLASH MEMORY (IC6) If the unit is working correctly but the TAM fanction can not work, you should check the Flash Memory.
  • Page 90 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.5.8.3. NG EXAMPLE...
  • Page 91 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.5.8.4. CHECK THE STATUS OF THE DIGITAL BOARD First, please check voltages and oscillation whether they are correct as follows.
  • Page 92 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S...
  • Page 93 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.5.9. ANALOG BOARD SECTION The analog parts check is actually different from the digital parts check. The signal route is determined by the purpose of the check. For example, the handset TX route begins from the handset microphone and is output in the telephone line. In this route, it is mainly an analog signal.
  • Page 94 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S Note: { }: Inside the digital board [ ]: Inside the operation board...
  • Page 95 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.5.9.2. DEFECTIVE ITS (INTEGRATED TELEPHONE SYSTEM) SECTION...
  • Page 96 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.5.10. POWER SUPPLY BOARD SECTION 1. Key components for troubleshooting Check the following parts first: F101, D101-D104, C106, Q101, PC101 and IC101. This comes from our experience with experimental tests. For example: power supply and lightning surge voltage test, withstanding voltage test, intentional short circuit test, etc.
  • Page 97 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 2. Troubleshooting Flow Chart...
  • Page 98 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 3. Broken parts repair details (D101, D102, D103, D104) Check for a short-circuit in terminal 4. If D101, D102, D103 and D104 are short-circuits, F101 will melt (open). In this case, replace all of the parts (D101, D102, D103, D104, F101).
  • Page 99 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.5.11. OPERATION BOARD SECTION 7.5.11.1. NO KEY OPERATION CROSS REFERENCE: TEST FUNCTIONS (P.45) 7.5.11.2. NO LCD INDICATION CROSS REFERENCE: TEST FUNCTIONS (P.45)
  • Page 100 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.5.12. SENSOR SECTION Refer to 6.5. SENSORS AND SWITCHES for the circuit descriptions. 7.5.12.1. CHECK THE DOCUMENT SENSOR (PS1)...."CHECK DOCUMENT" 7.5.12.2. CHECK THE READ POSITION (SW44)...."REMOVE DOCUMENT" 7.5.13. READ SECTION...
  • Page 101 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S CROSS REFERENCE: TEST FUNCTIONS (P.45)
  • Page 102 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 7.5.14. THERMAL HEAD SECTION Refer to THERMAL HEAD (P.115). CROSS REFERENCE: SUPERVISION CIRCUIT FOR THE THERMAL HEAD TEMPERATURE (P.112) THERMAL HEAD (P.115)

  • Page 103: Circuit Operations

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 8 CIRCUIT OPERATIONS 8.1. CONNECTION DIAGRAM...

  • Page 104: General Block Diagram

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 8.2. GENERAL BLOCK DIAGRAM The control section will be explained as shown in the block diagram. 1. ASIC (IC1) Composed mainly of an address decoder, modem control section, CPU and RTC.
  • Page 105 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 8.2.1. GENERAL BLOCK DIAGRAM...

  • Page 106: Control Section

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 8.3. CONTROL SECTION 8.3.1. BLOCK DIAGRAM...
  • Page 107 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 8.3.2. ASIC (IC1) This custom IC is used for general FAX operations. 1. CPU This model uses a Z80 equivalent CPU operating at 8MHz. Many of the peripheral functions are handled by custom designed LSIs. As a result, the CPU only needs to process the result.
  • Page 108 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S SIGNAL POWER SUPPLIED DESCRIPTION VOLTAGE TONE2 3.3V TONE OUTPUT VOLUREF 3.3V ANALOG REF VOLTAGE VOLUOUT 3.3V VOLUME OUTPUT VOLUIN 3.3V VOLUME INPUT XNMI 3.3V HIGH FIXED FMEMDO/IOP 3.3V OUTPUT PORT (CIS ON) VDD (3.3V)
  • Page 109 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S SIGNAL POWER SUPPLIED DESCRIPTION VOLTAGE ADR12 3.3V CPU ADDRESS 12 RBA0 3.3V ROM/RAM BANK ADDRESS 0 RBA1 3.3V ROM/RAM BANK ADDRESS 1 RBA2 3.3V ROM/RAM BANK ADDRESS 2 RBA3 3.3V...
  • Page 110 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 8.3.3. ROM (IC2) This 512 KB ROM (OTPROM or MASKROM) has 32 KB of common area and bank area (BK4~BK 63). The capacity of each bank is 8 KB.
  • Page 111 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 8.3.6. SRAM and RTC BACK UP CIRCUIT 1. Function This unit has a lithium battery (BAT1) which works for the RAM (IC4) and Real Time Clock (RTC, Integrated into ASIC:IC1).
  • Page 112 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 8.3.7. SUPERVISION CIRCUIT FOR THE THERMAL HEAD TEMPERATURE 1. Function The thermistor changes the resistor according to the temperature and uses the thermistor´s characteristics. The output of pin 139 of IC1 becomes a low level.

  • Page 113: Facsimile Section

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 8.4. FACSIMILE SECTION 8.4.1. IMAGE DATA FLOW DURING FACSIMILE OPERATION COPY (Fine, Super-Fine, Half Tone) 1. Line information is read by CIS, via route (1), and is input to IC1.
  • Page 114 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 8.4.2. BLOCK DIAGRAM...
  • Page 115 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 8.4.3. THERMAL HEAD 1. Function This unit utilizes state of the art thermal printer technology. The recording paper (roll paper) is chemically processed. When the thermal head contacts this paper it emits heat momentarily, and black dots (appearing like points) are printed on the paper.
  • Page 116 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S...
  • Page 117 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 8.4.4. SCANNING BLOCK The scanning block of this device consists of a control circuit and a contact image sensor made up of a celfoc lens array, an LED array, and photoelectric conversion elements.
  • Page 118 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 8.4.5. STEPPING MOTOR DRIVE CIRCUIT 1. Function One individual stepping motor is used for transmission and reception. It feeds the document or recording paper synchronized for reading or printing.

  • Page 119: Gear Section

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 8.4.6. GEAR SECTION This section shows how the motor-driven gear mechanism works in the main operations: FAX transmission, FAX reception the motor and copying. 8.4.6.1. MODE SELECTION When the motor attached to the Drive Motor Gear rotates counterclockwise (CCW), Swing Gear A engages the CAM and the CAM turns counterclockwise to select a mode.
  • Page 120 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 8.4.6.2. MODE OPERATION Once a mode is selected, the Drive Motor Gear rotates clockwise (CW) and then the Swing Gear A-1 controls the mode operation. A: Transmit mode Swing Gear A-1 engages G6 and conveys its drive power to the Separation Roller Gear for pre-feeding documents.
  • Page 121 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 8.4.6.3.2. SCANNING CROSS REFERENCE: SENSOR SECTION (P.100) 8.4.6.3.3. PRINTING Note: See 6.5. SENSERS AND SWITCHES.
  • Page 122 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 8.4.6.3.4. COPYING CROSS REFERENCE: SENSOR SECTION (P.100)

  • Page 123: Sensors And Switches

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 8.5. SENSORS AND SWITCHES All of the sensors and switches are shown below. Sensor Circuit Sensor Sensor or Switch Name Message Error Location DIGITAL Motor Position [CALL SERVICE 2]...
  • Page 124 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 8.5.1. MOTOR POSITION SENSOR This sensor is a detection switch for recording the position of the CAM. Digital Board Signal (IC1-119 Pin) Home position Low level Other High level 8.5.2.
  • Page 125 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 8.5.4. HOOK SWITCH (SW2) When the handset is lifted, the switch turns ON, and the signal at pin 43 of IC1 becomes low. When the handset is returned, the switch turns OFF, and the signal at pin 43 of IC1 becomes high.
  • Page 126 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 8.5.6. DOCUMENT TOP SW (SW44) When a document is brought to the read position, the SW becomes ON, and the input signal of IC1-16 pin (Operation) becomes a low level. When there is no document at the read position, the SW becomes OFF, and the input signal of IC1-16 pin (Operation) becomes a high level.

  • Page 127: Modem Section

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 8.6. MODEM SECTION 8.6.1. FUNCTION The unit uses a 1 chip modem (IC5), enabling it to act as an interface between the control section for FAX sending and receiving, and the telephone line. During a sending operation, the digital image signals are modulated and sent to the telephone line.
  • Page 128 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 3. Facsimile Call Time Series As shown in the following diagram, the facsimile call time series is divided into five phases. Phase A : Call setting Call setting can be manual/automatic.
  • Page 129 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 6. Explanation of Technology a. G3 Communication Signals (T. 30 Binary Process) For G3 facsimile communication, this is the procedure for exchanging control signals between the sending and receiving machines both before and after transmission of image signals.
  • Page 130 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S (Example) Bit No. DIS/DTC Transmitter - T.2 operation Receiver - T.2 operation Receiver - T.2 operation T.2 IOC = 176 T.2 IOC = 176 Transmitter - T.3 operation Receiver - T.3 operation Receiver - T.3 operation...
  • Page 131 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S Bit No. DIS/DTC Standard setting Recording width capability 1216 picture elements along Middle 1216 elements of 1728 picture elements scan line length of 151 ± mm 1% Recording width capability 864 picture elements along Middle 864 elements of 1728 picture elements scan line length of 107 ±...
  • Page 132 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S b. Redundancy Compression Process Coding Mode This unit uses one-dimensional MH format.
  • Page 133 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 8.6.2. MODEM CIRCUIT OPERATION The modem (IC5) has all the hardware satisfying the ITU-T standards mentioned previously. When the ASIC IC1 (61) is brought to a low level, the modem (IC5) is chip-selected and the resistors inside IC are selected by the select signals from ASIC (IC1) ADR0-ADR4.

  • Page 134: Analog Unit Block Diagram

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 8.7. ANALOG UNIT BLOCK DIAGRAM...

  • Page 135: Ncu Section

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 8.8. NCU SECTION 8.8.1. GENERAL This section is the interface between the telephone line. It is composed of bell detection circuit, pulse dialing circuit, CPC detection circuit, line amplifier, sidetone circuits and Remote FAX activation circuit.
  • Page 136 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 8.8.5. LINE AMPLIFIER AND SIDE TONE CIRCUITS 1. Circuit Operation The reception signal received as output from line transformer T1 is given as input to C17, R13, C11, R16, IC3(6-7) and IC3(2).

  • Page 137: Its (Integrated Telephone System) And Monitor Section

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 8.9. ITS (INTEGRATED TELEPHONE SYSTEM) AND MONITOR SECTION 8.9.1. GENERAL The general ITS operation is performed by the modem IC5. The alarm tone, the key tone, the calling tone and the beep are output from the ASIC IC1 (digital board).
  • Page 138 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 8.10.2. CIRCUIT DIAGRAM...

  • Page 139: Operation Board Section

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 8.11. OPERATION BOARD SECTION The unit consists of an LCD (Liquid crystal display), KEYs and LED (light-emitting diode). They are controlled by the Gate Array (IC1) and ASIC (IC1: on the DIGITAL BOARD). The key matrix table is shown below.

  • Page 140: Lcd Section

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 8.12. LCD SECTION The Gate Array (IC1) works only for writing the ASCII code from data bus (D4-D7). V0 is supplied for the crystal drive. R13 and R14 are density control resistors. Consequently, in this unit, the timing (positive clock) is generated by the LCD interface circuitry in the gate array (IC1).

  • Page 141: Power Supply Board Section

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 8.13. POWER SUPPLY BOARD SECTION This power supply board uses the switching regulator method. [Input Circuit] The input current goes into the input rectifier circuit through the filter circuit. The filter circuit decreases the noise voltage and the noise electric field strength.
  • Page 142 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S The following is an overview of how the power supply unit is controlled. The control method of this power supply unit is pulse width modulation. When Q is ON, the energy is charged in the transfer primary coil according to E .
  • Page 143 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S [Surge Absorber Circuit] This circuit is for absorbing surge voltage generated by the transformer. [Control Circuit and Detecting Circuit] The control circuit amplifies the output with increased voltage detected in the error detecting circuit. Then it drives the main transistor.

  • Page 144: Reference Material Data

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 9 REFERENCE MATERIAL DATA 9.1. TERMINAL GUIDE OF THE ICs TRANSISTORS AND DIODES...

  • Page 145: How To Replace The Flat Package Ic

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 9.2. HOW TO REPLACE THE FLAT PACKAGE IC Even if you do not have the special tools (for example, a spot heater) to remove the Flat IC, with some solder (large amount), a soldering iron and a cutter knife, you can easily remove the ICs that have more than 100 pins.

  • Page 146: Flat Package Ic Installation Procedure

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 9.2.3. FLAT PACKAGE IC INSTALLATION PROCEDURE 1. Temporarily fix the FLAT PACKAGE IC, soldering the two marked pins. *Check the accuracy of the IC setting with the corresponding soldering foil.

  • Page 147: Test Chart

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 9.3. TEST CHART 9.3.1. ITU-T No.1 TEST CHART...
  • Page 148 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 9.3.2. ITU-T No.2 TEST CHART...

  • Page 149: Fixtures And Tools

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 10 FIXTURES AND TOOLS...

  • Page 150: Cabinet, Mechanical

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 11 CABINET, MECHANICAL 11.1. OPERATION PANEL SECTION...

  • Page 151: Upper Cabinet Section

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 11.2. UPPER CABINET SECTION...

  • Page 152: Lower Cabinet

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 11.3. LOWER CABINET CROSS REFERENCE: MOTOR SECTION (P.153)

  • Page 153: Motor Section

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 11.4. MOTOR SECTION 11.4.1. KX-FT901CX-B/W/S...
  • Page 154 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 11.4.2. KX-FT903CX-B/W/S...

  • Page 155: Actual Size Of Screws

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 11.5. ACTUAL SIZE OF SCREWS...

  • Page 156: Accessories And Packing Materials

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 12 ACCESSORIES AND PACKING MATERIALS...

  • Page 157: Replacement Parts List

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 13 REPLACEMENT PARTS LIST 1. RTL (Retention Time Limited) Ref. Part No. Part Name & Description Remarks Note: PFGG1209Y2 GRILLE,OPERATION PANEL (KX- PS-HB FT901/903CX-W) The marking (RTL) indicates that the Retention Time is...
  • Page 158 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S Ref. Part No. Part Name & Description Remarks 13.1.4. MOTOR SECTION PFKV1026Y1 COVER,CUTTER(KX-FT903CX-B) PS-HB Ref. Part No. Part Name & Description Remarks PFKV1095Z2 COVER,CUTTER(KX-FT901CX-W) PS-HB PFKV1026Y3 COVER,CUTTER(KX-FT903CX-W) PS-HB PFMH1084Z...

  • Page 159: Digital Board Parts

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks PFZE1210Z-C GIFT BOX ASS´Y (KX-FT903CX-W) EXB38V101JV RESISTOR ARRAY PFZE1215Z-C GIFT BOX ASS´Y (KX-FT901CX-S)
  • Page 160 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks ERJ3GEYJ101 ECUV1E104ZFV ERJ3GEYJ471 ECUV1E104ZFV ERJ3GEYJ101 ECUV1C104KBV ERJ3GEYJ101 ECUV1H102KBV 0.001 ERJ3GEYJ102 ECUV1H150JCV ERJ3GEY0R00 ECUV1E104ZFV...
  • Page 161 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks PFWIFT903CX IC (ROM) ERJ3GEYJ101 PFVII5510011 ERJ3GEYJ101 C3BBHC000330 ERJ3GEYJ101 PFVIR676812 ERJ3GEYJ101 C3FBKC000108 ERJ3GEY0R00 PFVIT2003APS...

  • Page 162: Analog Board Parts

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks ERJ3GEYJ104 100K ECUV1E104ZFV ERJ3GEYJ163 ECUV1C104KBV ERJ3GEYJ181 ECUV1C333KBV 0.033 ERJ3GEYJ222 2.2K ECUV1H103KBV 0.01 ERJ3GEYJ472 4.7K...
  • Page 163 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks (JACK AND CONNECTORS) ERJ3GEYJ225 2.2M PQJS16A10Z CONNECTOR,16 PIN ERJ3GEYJ333 PQJJ1TB18Z JACK ERJ3GEYJ683 PFJJ1T006Z...

  • Page 164: Operation Board Parts

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks ECUV1C333KBV 0.033 ECEA0JKA470 (RESISTORS) ECEA1CKA100 ERJ3GEYJ101 ECUV1H103KBV 0.01 ERJ3GEYJ472 4.7K ECEA0JKA470 ERJ3GEYJ331 ECUV1H103KBV 0.01...

  • Page 165: Fixtures And Tools

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks PFZZ5K13Z CONNECTOR, 5P (FUSE) PFZZ12K4Z CONNECTOR,12P F101 PFBA2153-15 FUSE PFZZ2K12Z CONNECTOR,2P PQZZ12K4Z CONNECTOR, 12P...

  • Page 166: Printed Circuit Board

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S...
  • Page 167 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S XTEST...

  • Page 168: Analog Board (Pcb2)

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S FLT3...
  • Page 169 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S...

  • Page 170: Operation Board (Pcb3)

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S...
  • Page 171 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S...

  • Page 172: Power Supply Board (Pcb4)

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S...

  • Page 173: For The Schematic Diagrams

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 15 FOR THE SCHEMATIC DIAGRAMS Note: 1. DC voltage measurements are taken with an oscilloscope or a tester with a ground. 2. The schematic diagrams and circuit board may be modified at any time with the development of new technology.

  • Page 174: Memo

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 16 MEMO...

  • Page 175: Schematic Diagram

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 17 SCHEMATIC DIAGRAM 17.1. DIGITAL BOARD (PCB1) 17.1.1. KX-FT901CX-B/W/S +3.3V/BATIN C114 Z0.1u MOTOR BLOCK +24V 4M ROM 1M SRAM A[0] D[0] RBA[4] RBA[3] A[1] D[1] RBA[2] A[2] D[2] +5VD...
  • Page 176 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S FAX TX CUTTER MODEL ONLY 4M FLASH FAX RX for VOICE A[0] D[0] 20 A0 A[1] 19 A1 D[1] A[2] D[2] 18 A2 +24V1 +5VA A[3] 17 A3 D[3]...
  • Page 177 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 17.1.2. KX-FT903CX-B/W/S +3.3V/BATIN C114 Z0.1u MOTOR BLOCK +24V 4M ROM 1M SRAM A[0] D[0] RBA[4] RBA[3] A[1] D[1] RBA[2] A[2] D[2] +5VD RBA[0] A[3] D[3] 9 A3 A[7] RBA[1]...
  • Page 178 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S CUTTER MODEL ONLY FAX TX 4M FLASH for VOICE FAX RX A[0] D[0] 20 A0 A[1] 19 A1 D[1] A[2] D[2] 18 A2 +24V1 +5VA A[3] 17 A3 D[3]...

  • Page 179: Analog Board (Pcb2)

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S 17.2. ANALOG BOARD (PCB2) +24VA 160K +2.0V J100p R13 75K K0.022u Z0.1u 50V4.7u +12V K0.022u 5.6V 4.7V 220 1/4W 5.6V 120K Immunity countermeasure part 1.6K 2.2M K3300p 5.1K K0.056u...
  • Page 180 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S FAX TX D7 NC FAX RX BEAD 150 2W ZNR1 350V RLY1 POS1 22 1/4W BEAD 2.2K 3000V 6.2K 22K 1/2W BEAD 250V1u BEAD 3.0V 3.0V 15K 1/2W CPC DETECT...

  • Page 181: Operation Board (Pcb3)

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S...

  • Page 182: Power Supply Board (Pcb4)

    KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S...
  • Page 183 KX-FT901CX-B / KX-FT903CX-B / KX-FT901CX-W / KX-FT903CX-W / KX-FT901CX-S / KX-FT903CX-S KXFT901CXB KXFT903CXB KXFT901CXW KXFT903CXW KXFT901CXS KXFT903CXS...

This manual is also suitable for:

Kx-ft903cx-wKx-ft901cx-wKx-ft901cx-sKx-ft903cx-bKx-ft903cx-s

Table of Contents