Panasonic KX-FPC91 Service Manual
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Panasonic KX-FPC91 Service Manual

Panasonic KX-FPC91 Service Manual

Compact plain paper fax with cordless phone
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Compact Plain Paper FAX with Cordless Phone
KX-FPC91
(for U.S.A.)
© 2000 Kyushu Matsushita Electric Co., Ltd. All
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distribution is a violation of law.
ORDER NO. KMF0004404C1
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  • Page 1 ORDER NO. KMF0004404C1 Compact Plain Paper FAX with Cordless Phone KX-FPC91 (for U.S.A.) © 2000 Kyushu Matsushita Electric Co., Ltd. All rights reserved. Unauthorized copying distribution is a violation of law.

  • Page 2: Table Of Contents

    KX-FPC91 CONTENTS Page Page 1 INTRODUCTION 6.2. GENERAL BLOCK DIAGRAM 1.1. SAFETY PRECAUTIONS 6.3. CONTROL SECTION 1.2. INSULATION RESISTANCE TEST 6.4. FACSIMILE SECTION 1.3. FOR SERVICE TECHNICIANS 6.5. SENSORS AND SWITCHES 1.4. BATTERY CAUTION 6.6. MODEM SECTION 1.5. AC CAUTION 6.7.
  • Page 3 KX-FPC91 14.4. POWER SUPPLY BOARD 14.6. CHARGE BOARD 14.5. HANDSET BOARD...

  • Page 4: Introduction

    KX-FPC91 1 INTRODUCTION 1.1. 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 5: Ac Caution

    KX-FPC91 1.5. 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. 3. Wrap the earth lead around the core 3 times.

  • Page 6: Service Precautions

    KX-FPC91 1.6.2. 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. CAUTION: AC voltage is supplied to the primary side of the power supply unit. Therefore, always unplug the AC power cord before disassembling for service.

  • Page 7: Features

    KX-FPC91 1.8. FEATURES General 900 MHz Cordless · Help function · Fax activation from handset Please refer to 2.1.3 WHEN YOU DON'T KNOW HOW TO · 21 day battery life OPERATE THE UNIT, USE THE HELP FUNCTION.(P.31) · 10-station speed dial to print below features.

  • Page 8: Specifications

    KX-FPC91 1.9. SPECIFICATIONS (Main Unit) Applicable Lines: Public Switched Telephone Network Document Size: Max. 216 mm (8 1/2") in width Max. 600 mm (23 5/8") in length Effective Scanning Width: 208 mm (8 3/16") Recording Paper Size: Letter: 216×279 mm (8 1/2"×11") Legal: 216×356 mm (8 1/2"×14")

  • Page 9: Optional Accessories

    KX-FPC91 1.10. OPTIONAL ACCESSORIES...

  • Page 10: Test Chart

    KX-FPC91 1.11. TEST CHART 1.11.1. ITU-T No.1 TEST CHART...
  • Page 11 KX-FPC91 1.11.2. ITU-T No.2 TEST CHART...

  • Page 12: Location Of Controls

    KX-FPC91 1.12. LOCATION OF CONTROLS 1.12.1. OVERVIEW Note: · The document will be ejected from the front of the unit. Install the unit on a desk or floor with a smooth surface and do not place anything in front of the unit.
  • Page 13 KX-FPC91 1.12.2. CONTROL PANEL...
  • Page 14 KX-FPC91 1.12.3. HANDSET...

  • Page 15: Connections

    KX-FPC91 1.13. CONNECTIONS 1. Connect the telephone line cord. 2. Connect the power cord. · When the power is turned on for the first time, the unit will print some basic information. Note: · For additional equipment protection, we recommend the use of a surge protector. The following types are available;...

  • Page 16: Installation

    KX-FPC91 1.14. INSTALLATION 1.14.1. 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. · Use the unit within the following ranges of temperature and humidity.

  • Page 17: Installing The Paper Tray

    KX-FPC91 1.14.2. INSTALLING THE PAPER TRAY Insert one tab on the paper tray into one slot on the back of the unit ) and then insert the other tab into the other slot ( Note: · Do not place the unit in areas where the paper tray may be obstructed by a wall, etc.

  • Page 18: Installing The Recording Paper

    KX-FPC91 1.14.3. INSTALLING THE RECORDING PAPER Letter* or legal** size recording paper can be loaded. The unit can hold up to 50 sheets of 60 g/m to 75 g/m (16 lb. to 20lb.) paper or 30 sheets of 90 g/m (24 lb.) paper.
  • Page 19 KX-FPC91 1.14.4. ADDING PAPER TO THE PAPER TRAY Pull the cassette open lever forward and remove all of the installed paper. Add paper to the removed paper and straighten. Fan the stack of paper. Pull the tension bar forward and hold open while inserting the paper.

  • Page 20: Setting Your Logo

    KX-FPC91 1.14.6. SETTING YOUR LOGO The logo can be your company, division or name. Press Display: Press , then Press Enter your logo, up to 30 characters, by using the dial keypad. Example: Bill a. Press twice. b. Press six times.
  • Page 21 KX-FPC91 1.14.7. TO SELECT CHARACTERS WITH THE DIAL KEYPAD 1.14.8. TO SELECT CHARACTERS USING THE JOG DIAL Instead of pressing the dial keys, you can select characters using the JOG DIAL. Rotate unit the desired character is displayed. Press to move the cursor to the next space.

  • Page 22: Replacing The Film Cartridge

    KX-FPC91 1.14.9. REPLACING THE FILM CARTRIDGE When the unit runs out of ink film, the following message will be displayed. Display: Install a new ink film. The following ink films are available for replacement. Each roll prints about 150 letter size pages.
  • Page 23 KX-FPC91 Remove the stoppers and tags from the new ink film. Find the “T” shaped gear (blue). Insert the blue core of the front ink film roll into the right slot of the unit ( ). Insert the “T” shaped gear (blue) into the...

  • Page 24: Replacing The Handset Battery

    KX-FPC91 1.14.10. REPLACING THE HANDSET BATTERY If the RECHARGE indicator flashes after being fully charged, replace the battery with a new Panasonic rechargeable battery Model No. KX-A36. To prevent memory loss, replace the battery within 3 minutes. Press down on the arrow and slide the handset cover.
  • Page 25 KX-FPC91 1.14.11. BATTERY LIFE If your Panasonic battery is fully charged, the battery life will last as follows. While in use Up to about 8 hours (on conversation) While not in use Up to about 21 days (stand-by/off the main unit) Note: ·...

  • Page 26: Maintenance Items And Component Locations

    KX-FPC91 1.15. MAINTENANCE ITEMS AND COMPONENT LOCATIONS 1.15.1. OUTLINE MAINTENANCE AND REPAIRS ARE PERFORMED USING THE FOLLOWING STEPS. 1. Periodic maintenance Inspect the equipment periodically and if necessary, clean any contaminated parts. 2. Check for breakdowns Look for problems and consider how they arose.
  • Page 27 KX-FPC91 1.15.2. MAINTENANCE CHECK ITEMS/COMPONENT LOCATIONS...
  • Page 28 KX-FPC91 1.15.2.1. 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 1.15.3 thoroughly. MAINTENANCE(P.29). Platen Roller If the platen is dirty, clean it with a damp cloth then dry —...
  • Page 29 KX-FPC91 1.15.3. MAINTENANCE 1.15.3.1. CLEANING THE DOCUMENT FEEDER UNIT If misfeeding occurs frequently or if dirty patterns or bands appear on a transmitted document or on the original of a copied document, clean the document feeder. 1. Disconnect the power cord and the telephone line cord.
  • Page 30 KX-FPC91 1.15.3.3. CLEANING THE PICKUP ROLLER Refer to 4.10 HOW TO REMOVE THE PICKUP ROLLER.(P.138) 1.15.4. CHARGE CONTACTS Clean the charge contacts with a dry soft cloth once a month, or the battery may not charge properly.

  • Page 31: Troubleshooting Guide

    KX-FPC91 2 TROUBLESHOOTING GUIDE 2.1. TROUBLESHOOTING SUMMARY 2.1.1. TROUBLESHOOTING After confirming the problem by asking the user, troubleshoot according to the instructions and observe the following precautions. 2.1.2. 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 32: User Recoverable Errors

    KX-FPC91 2.2. USER RECOVERABLE ERRORS If the unit detects a problem, one or more of the following messages will appear on the display. Note: The explanations given in the [ ] are for servicemen only. CROSS REFERENCE: 2.2.1 DOCUMENT JAMS(P.33) 2.2.2 RECORDING PAPER JAMS(P.34)

  • Page 33: Document Jams

    KX-FPC91 CROSS REFERENCE: 2.2.1 DOCUMENT JAMS(P.33) 2.2.2 RECORDING PAPER JAMS(P.34) Note: The explanations given in the [ ] are for servicemen only. 2.2.1. DOCUMENT JAMS If the unit does not release the document during feeding, remove the jammed document as follows.

  • Page 34: Recording Paper Jams

    KX-FPC91 2.2.2. RECORDING PAPER JAMS If the unit does not eject any recording paper during reception or copying, the recording paper has jammed and the display will show the following massage. When paper has jammed under the film cartridge Display: Remove the jammed paper as follows.
  • Page 35 KX-FPC91 If the ink film is slack, tighten it by winding the gears. Close the back cover securely by pushing down on the dotted area at both ends ( Close the front cover securely (...

  • Page 36: Troubleshooting Details

    KX-FPC91 2.3. TROUBLESHOOTING DETAILS 2.3.1. OUTLINE Troubleshooting is for recovering quality and reliability by determining the broken component and replacing, adjusting or cleaning it as required. First, determine the problem then decide the troubleshooting method. If you have difficulty finding the broken part, determine which board is broken.
  • Page 37 KX-FPC91 2.3.3. TROUBLESHOOTING ITEMS TABLE CROSS REFERENCE: 2.3.4 ADF (Auto Document Feed) SECTION(P.39) 2.3.5 COMMUNICATION SECTION(P.52) 2.3.7 ANALOG BOARD SECTION(P.80) 2.3.9 OPERATION PANEL SECTION(P.87) 2.3.10 SENSOR SECTION(P.88) 2.3.13 CORDLESS SECTION( P.92)
  • Page 38 KX-FPC91 2.3.3.1. SIMPLE CHECK LIST CROSS REFERENCE: 2.5 TEST FUNCTIONS(P.113)
  • Page 39 KX-FPC91 2.3.4. ADF (Auto Document Feed) SECTION 2.3.4.1. NO DOCUMENT FEED CROSS REFERENCE: 2.3.6 DIGITAL BOARD SECTION(P.71) 2.3.8 POWER SUPPLY BOARD SECTION(P.84) 2.3.10 SENSOR SECTION(P.88) 2.5 TEST FUNCTIONS(P.113) 3 ADJUSTMENTS(P.120) 4 DISASSEMBLY INSTRUCTIONS(P.128) 6.4.5 STEPPING MOTOR DRIVE CIRCUIT(P.162) Note: When using thin paper etc., sometimes the document will not feed. Refer to 3.1 ADJUSTING THE FEEDER...

  • Page 40: Document Jam

    KX-FPC91 2.3.4.2. DOCUMENT JAM CROSS REFERENCE: 2.3.10 SENSOR SECTION(P.88) 4 DISASSEMBLY INSTRUCTIONS(P.128)
  • Page 41 KX-FPC91 2.3.4.3. MULTIPLE FEED · When using thick paper etc., sometimes the document will not be fed. Refer to 3.1 ADJUSTING THE FEEDER PRESSURE(P.120). Fig. B CROSS REFERENCE: 1.15.3 MAINTENANCE(P.29) 3 ADJUSTMENTS(P.120) 4 DISASSEMBLY INSTRUCTIONS(P.128) Note: When confirming if the characters are extended or distorted, or if the feed problem is occurred, use this test chart format...
  • Page 42 KX-FPC91 2.3.4.4. SKEW * We recommend making a copy of the Fig. B document in 2.3.4.3 MULTIPLE FEED (P.41) and using it. CROSS REFERENCE: 1.15.2 MAINTENANCE CHECK ITEMS/COMPONENT LOCATIONS(P.27) 2.3.4 ADF (Auto Document Feed) SECTION(P.39) 2.3.4.3 MULTIPLE FEED(P.41) 4 DISASSEMBLY INSTRUCTIONS(P.128)
  • Page 43 KX-FPC91 2.3.4.5. THE RECORDING PAPER DOES NOT FEED * We recommend making a copy of the Fig. B document in 2.3.4.3 MULTIPLE FEED (P.41)and using it. CROSS REFERENCE: 1.14.3 INSTALLING THE RECORDING PAPER(P.18) 2.3.6 DIGITAL BOARD SECTION(P.71) 2.3.8 POWER SUPPLY BOARD SECTION(P.84) 2.3.10 SENSOR SECTION(P.88)

  • Page 44: Paper Jam

    KX-FPC91 2.3.4.6. PAPER JAM CROSS REFERENCE: 2.3.10 SENSOR SECTION(P.88) 2.5 TEST FUNCTIONS(P.113) 4 DISASSEMBLY INSTRUCTIONS(P.128) 6.5 SENSORS AND SWITCHES(P.172)
  • Page 45 KX-FPC91 2.3.4.7. MULTIPLE FEED AND SKEW CROSS REFERENCE: 4 DISASSEMBLY INSTRUCTIONS(P.128) 9.2.1 BACK COVER SECTION(P.214) 2.3.4.8. THE SENT FAX DATA IS SKEWED * We recommend making a copy of the Fig. B document in 2.3.4.3 MULTIPLE FEED(P.41) and using it.
  • Page 46 KX-FPC91 2.3.4.10. RECEIVED OR COPIED DATA IS EXPANDED * We recommend making a copy of the Fig. B document in 2.3.4.3 MULTIPLE FEED(P.41) and using it. CROSS REFERENCE: 4 DISASSEMBLY INSTRUCTIONS(P.128)
  • Page 47 KX-FPC91 2.3.4.11. A BLANK PAGE IS COPIED * We recommend making a copy of the Fig. B document in 2.3.4.3 MULTIPLE FEED (P.41) and using it. CROSS REFERENCE: 2.3.4.12 A BLANK PAGE IS RECEIVED(P.49) 2.5 TEST FUNCTIONS(P.113) 4 DISASSEMBLY INSTRUCTIONS(P.128)
  • Page 48 KX-FPC91 Fig. C...
  • Page 49 KX-FPC91 2.3.4.12. A BLANK PAGE IS RECEIVED CROSS REFERENCE: 2.3.4.11 A BLANK PAGE IS COPIED(P.47) 2.3.7 ANALOG BOARD SECTION(P.80) 2.5 TEST FUNCTIONS(P.113) 2.3.4.13. BLACK OR WHITE VERTICAL LINE * We recommend making a copy of the Fig. B document in 2.3.4.3 MULTIPLE FEED (P.41) and using it.
  • Page 50 KX-FPC91 2.3.4.14. BLACK OR WHITE LATERAL LINE ON PRINT OUT * We recommend making a copy of the Fig. B document in 2.3.4.3 MULTIPLE FEED(P.41) and using it. CROSS REFERENCE: 2.3.4.11 A BLANK PAGE IS COPIED(P.47) 2.3.6 DIGITAL BOARD SECTION(P.71) 2.5 TEST FUNCTIONS(P.113)
  • Page 51 KX-FPC91 2.3.4.15. AN ABNORMAL IMAGE IS PRINTED * We recommend making a copy of the Fig. B document in 2.3.4.3 MULTIPLE FEED (P.41) and using it. CROSS REFERENCE: 2.3.7 ANALOG BOARD SECTION(P.80) 2.5 TEST FUNCTIONS(P.113) 4 DISASSEMBLY INSTRUCTIONS(P.128)
  • Page 52 KX-FPC91 2.3.5. COMMUNICATION SECTION Find the problem in the table shown below, and refer to the corresponding troubleshooting procedure in 2.3.5.1 DEFECTIVE FACSIMILE SECTION(P.53). Symptom Content Possible cause The paper is not fed properly when faxing. Troubleshooting Problem with the feeding (Nor in the copy mode.)
  • Page 53 KX-FPC91 2.3.5.1. DEFECTIVE FACSIMILE SECTION 2.3.5.1.1. TRANSMIT PROBLEM CROSS REFERENCE: 1.15.3 MAINTENANCE(P.29) 2.3.4 ADF (Auto Document Feed) SECTION(P.39) 2.3.9 OPERATION PANEL SECTION(P.87)
  • Page 54 KX-FPC91 2.3.5.1.2. SOMETIME THERE IS A TRANSMIT PROBLEM Note: "596: Transmit level set" represents a service code. (Refer to 2.4.4 SERVICE FUNCTION TABLE(P.101).)
  • Page 55 KX-FPC91 2.3.5.1.3. RECEIVE PROBLEM First confirm whether the recording paper is installed properly or not before starting troubleshooting. (Refer to "Remarks".) Note: "596: Transmit level set" represents a service code. (Refer to 2.4.4 SERVICE FUNCTION TABLE(P.101).) Remarks: Regarding the reception problem, we have investigated the conceivable causes in the flow chart except for the software-related errors.
  • Page 56 KX-FPC91 2.3.5.1.4. THE UNIT CAN COPY, BUT CANNOT TRANSMIT/RECEIVE CROSS REFERENCE: 2.3.7 ANALOG BOARD SECTION(P.80) 2.5 TEST FUNCTIONS(P.113) 2.3.5.1.5. THE UNIT CAN COPY, BUT CANNOT EITHER TRANSMIT/RECEIVE LONG DISTANCE OR INTERNATIONL COMMUNICATIONS The following two causes can be considered for this symptom.
  • Page 57 KX-FPC91 (Cause and Countermeasure) As shown in the chart above, the total handshaking time must be reduced, but because of the long distance connection and linking of several stations, the line connection time cannot be reduced. Accordingly, the following countermeasures should be tried.
  • Page 58 KX-FPC91 (Cause C) This model is FAX1 and the other party is FAX2. For transmission from this model to FAX2, FAX2 executes automatic reception and transmits a CED signal (2100 Hz) followed by a DIS signal. As the echo cancelers stops as described in cause B, the echo of the DIS signal returns to FAX2. On the other hand, this model detects the DIS signal and transmits a DCS signal.
  • Page 59 KX-FPC91 2.3.5.1.7. HOW TO OUTPUT THE JOURNAL REPORT 1. Press the MENU button two times. 2. Rotate JOG DIAL until the “ JOURNAL REPORT ” is displayed. 3. Press the SET button. 4. The report prints out. Error code table:...
  • Page 60 KX-FPC91...
  • Page 61 KX-FPC91 CROSS REFERENCE: 2.5 TEST FUNCTIONS(P.113)
  • Page 62 KX-FPC91 CROSS REFERENCE: 2.5 TEST FUNCTIONS(P.113)
  • Page 63 KX-FPC91 CROSS REFERENCE: 2.5 TEST FUNCTIONS(P.113)
  • Page 64 KX-FPC91 CROSS REFERENCE: 2.5 TEST FUNCTIONS(P.113)
  • Page 65 KX-FPC91...
  • Page 66 KX-FPC91...
  • Page 67 KX-FPC91 CROSS REFERENCE: 2.5 TEST FUNCTIONS(P.113)

  • Page 68: Remote Programming

    KX-FPC91 2.3.5.2. 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 69 KX-FPC91 2.3.5.2.2. PROGRAM MODE TABLE Code Function Set Value Default Remote Setting Set date and time mm/dd/yy hh:mm Jan/01/00 Your logo --------- None Your telephone number --------- None Transmission report mode 1:Error / 2:ON / 3:OFF Error FAX ring count 1 to 5 rings (for ext.
  • Page 70 KX-FPC91 Code Function Set Value Default Remote Setting Power on film feed 1:ON / 2:OFF CNG detect time for friendly reception 1:10s / 2:20s / 3:30s T1 timer 1:35s / 2:60s T4 timer 00~99 × 100ms Sensor & VOX test...

  • Page 71: Digital Board Section

    KX-FPC91 2.3.6. DIGITAL BOARD SECTION When the unit fails to boot up the system, take the troubleshooting procedures very carefully. It may have a serious problem. The symptom: No response when the power is turned on. (No LCD display, and keys are not accepted.) The first step is to check the power source.
  • Page 72 KX-FPC91 2.3.6.1. DIGITAL BLOCK DIAGRAM You also need to check the signal lines listed here [List 1] when the unit fails to boot up the system. Those signal lines should remain normal. Other signal lines are not directly related to that failure even if they have faults or troubles.
  • Page 73 KX-FPC91 NG Wave pattern (Refer to NG EXAMPLE)
  • Page 74 KX-FPC91 Normal Wave Patterns Remarks: When you use an oscilloscope to judge whether a signal to be same order as in [List 1]. (If the ASIC fails to access the ROM, tested is normal or NG, perform the signal check in exactly the the ASIC cannot access SRAM or DRAM normally.)
  • Page 75 KX-FPC91 I/O and Pin No. Diagram...
  • Page 76 KX-FPC91 After the power is turned on, the ASIC initializes and checks each IC. The ROM, SRAM, and modem are checked. If initialization fails for the ICs , the system will not boot up. In this case, please find the cause as follows.
  • Page 77 KX-FPC91 CROSS REFERENCE: 2.3.6.3 CHECK THE STATUS OF THE DIGITAL BOARD(P.79) Other NG example while the power is ON and the LCD displays the following.
  • Page 78 KX-FPC91 2.3.6.2. NG EXAMPLE...
  • Page 79 KX-FPC91 2.3.6.3. CHECK THE STATUS OF THE DIGITAL BOARD...
  • Page 80 KX-FPC91 2.3.7. ANALOG BOARD SECTION This chapter provides the testing procedures required for the analog parts. A signal route to be tested is determined depending upon purposes. For example, the handset TX route begins at the handset microphone and the signal is output to the telephone line.
  • Page 81 KX-FPC91...
  • Page 82 KX-FPC91 2.3.7.2. DEFECTIVE ITS (Integrated Telephone System) SECTION 1. No handset transmission / reception and No monitor reception Perform a signal test in the ITS or the NCU section and locate a defective point (where the signal disappears) on each route...
  • Page 83 KX-FPC91 4. No tone dialing CROSS REFERENCE: 2.3.7.1 CHECK SHEET(P.80) 2.3.7.3. DETECTIVE TAM INTERFACE SECTION 1. The FAX turns on, but does not arrive through TAM. CROSS REFERENCE: 6.10.2 CIRCUIT OPERATION(P.189) 2. A FAX is received, but won´t switch from TAM to FAX.

  • Page 84: Power Supply Board Section

    KX-FPC91 2.3.8. POWER SUPPLY BOARD SECTION 2.3.8.1. 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 85 KX-FPC91 2.3.8.2. TOROUBLESHOOTING FLOW CHART...
  • Page 86 KX-FPC91 2.3.8.3. 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 87 KX-FPC91 2.3.9. OPERATION PANEL SECTION 2.3.9.1. NO KEY OPERATION CROSS REFERENCE: 2.5 TEST FUNCTIONS(P.113) 2.3.9.2. NO LCD INDICATION CROSS REFERENCE: 2.5 TEST FUNCTIONS(P.113)
  • Page 88 KX-FPC91 2.3.10. SENSOR SECTION Refer to 6.5 SENSORS AND SWITCHES(P.172) for the circuit descriptions. The Test Function makes the sensor circuit check easier. (Refer to 2.5 TEST FUNCTIONS(P.113).) For example, as for "COVER OPEN SENSOR", "CO" is turned ON/OFF on the display when you open or close the front cover.
  • Page 89 KX-FPC91 2.3.10.4. CHECK THE PAPER TOP SENSER (PS501)......"PAPER JAMMED" 2.3.11. CIS (Contact Image Sensor) SECTION Refer to 6.4.4 SCANNING BLOCK(P.161). CROSS REFERENCE: 2.5 TEST FUNCTIONS(P.113)
  • Page 90 KX-FPC91...
  • Page 91 KX-FPC91 2.3.12. THERMAL HEAD SECTION Refer to 6.4.3 THERMAL HEAD(P.159).
  • Page 92 KX-FPC91 2.3.13. CORDLESS SECTION 2.3.13.1. BATTERY WON´T CHARGE (Base Unit) 2.3.13.2. BATTERY WON´T CHARGE (Handset)
  • Page 93 KX-FPC91 2.3.13.3. NO VOICE RECEPTION Note: When checking the RF UNIT, refer to 2.3.14 HOW TO CHECK THE RF UNIT(P.97).
  • Page 94 KX-FPC91 2.3.13.4. NO VOICE TRANSMISSION...
  • Page 95 KX-FPC91 2.3.13.5. NO LINK (Handset TX) 2.3.13.6. NO LINK (Handset RX)
  • Page 96 KX-FPC91 2.3.13.7. NO LINK (Base Unit RX) 2.3.13.8. NO LINK (Base Unit TX)
  • Page 97 KX-FPC91 2.3.14. HOW TO CHECK THE RF UNIT Factory supply only assembled RF unit for base unit and Handset. (Factory does not supply each parts on RF Unit.) 2.3.14.1. HANDSET 1. Warm up the Marconi Radio Tester for at least 30 minutes to allow internal crystal oscillation to become stable.
  • Page 98 KX-FPC91 2.3.14.5. SQUELCH CHECK: 1. Connect scope probe (X1) lead to TP-SQ, negative to TP-VSS and BNC end to scope. 2. Set scope to the following condition: TIME/DIV = 1 msec, VOLT/DIV = 1 V 3. Set RF GEN LEVEL to +5 dBµV(+11dBµVemf). Check scope voltage is LOW.

  • Page 99: Programming And Lists

    KX-FPC91 2.4. PROGRAMMING AND LISTS The programming functions are used to program the various features and functions of the machine, and to test the machine. This facilitates communication between the user and the service man while programming the unit. 2.4.1.
  • Page 100 KX-FPC91 2.4.3. USER MODE (The list below is an example of the SYSTEM SETUP LIST the unit prints out.) Note: The above values are the default values.
  • Page 101 KX-FPC91 2.4.4. SERVICE FUNCTION TABLE Code Function Set Value Effective Default Remarks Range Pause time set X 100 msec 001~600 ---------- Flash time X 10 ms 01~99 ---------- Dial speed select 1:10 pps 2:20 1, 2 ---------- VOX sense 1:High 2:Low...
  • Page 102 KX-FPC91 Code Function Set Value Effective Default Remarks Range Overseas DIS detection select 1:detects at 1, 2 See Symptom/Countermeasure Table for long the 1st time distance and international calls in 2.3.5.1.5 THE 2:detects at UNIT CAN COPY, BUT CANNOT EITHER...
  • Page 103 KX-FPC91 2.4.5. SERVICE MODE SETTINGS (Example of a printed out list) Note: The above values are the default values.
  • Page 104 KX-FPC91 2.4.6. HISTORY Note: See the following descriptions of this report. Item No. (1) ~ (49) are corresponding to the listed items in 2.4.6.1 DESCRIPTIONS OF THE HISTORY REPORT(P.105).
  • Page 105 KX-FPC91 2.4.6.1. DESCRIPTIONS OF THE HISTORY REPORT (1) ROM VERSION EPROM version (2) SUM EPROM internal data calculation. (3) YOUR LOGO The user logo recorded in the unit. If it is not recorded, NONE will be displayed. (4) YOUR TELEPHONE NUMBER The user telephone number recorded in the unit.
  • Page 106 KX-FPC91 (25) NUM(BER OF RECORDING MESSAGE The number of messages recorded in TAM. (26) NUMBER OF PC SCAN The number of times multifunction was used for the Scanner. (The number of pages scanned. If the unit does not have a PC interface, NONE will be printed.)
  • Page 107 KX-FPC91 (49) ENGINE VERSION Engine Control CPU Version.
  • Page 108 KX-FPC91 2.4.7. SPECIAL SERVICE JOURNAL REPORTS Journal 2 and Journal 3 shown below, which are special journals giving the additional detailed information about the latest 30 communications, can be printed by Service Code 881 or 882. Remote printing function for the journal reports (JOURNAL, JOURNAL 2 and JOURNAL 3) is also available for service technicians.
  • Page 109 KX-FPC91 2.4.7.1. JOURNAL 2 Refer to JOURNAL 2 in 2.4.7.3 PRINTOUT EXAMPLE(P.111). Journal 2 displays the additional detailed information about the last 30 communications. Descriptions: (1) RCV. MODE Indicates which receive mode the unit was in when the unit received a fax message.
  • Page 110 KX-FPC91 2.4.7.2. JOURNAL 3 Refer to JOURNAL 3 in 2.4.7.3 PRINTOUT EXAMPLE(P.111). Descriptions: (6) ENCODE Compression Code: MH/MR (7) MSLT MSLT means Minimum Scan Line Time. Used only at the factory. (8) EQM EQM means Eye Quality Monitor. Used only at the factory.
  • Page 111 KX-FPC91 2.4.7.3. PRINTOUT EXAMPLE...
  • Page 112 KX-FPC91...

  • Page 113: Test Functions

    KX-FPC91 2.5. TEST FUNCTIONS The codes listed below can be used to perform simple checks of some of the unit’s functions. When complaints are received from customers, they provide an effective tool for identifying the locations and causes of malfunctions.

  • Page 114: Dtmf Single Tone Transmit Selection

    KX-FPC91 Note: The numbers in the boxes (XXX) indicate the keys to be input for the various test modes. CROSS REFERENCE: 3.2 CORDLESS(P.121) 6.5 SENSORS AND SWITCHES(P.172) 2.5.1. DTMF SINGLE TONE TRANSMIT SELECTION Note: After performing this check, do not forget to turn the setting off.

  • Page 115: Button Code Table

    KX-FPC91 2.5.2. BUTTON CODE TABLE Note: These codes (00, 01) are only for the data in the History Report.
  • Page 116 KX-FPC91 2.5.3. PRINT TEST PATTERN 1. Platen roller (Reference pattern)
  • Page 117 KX-FPC91 2. Left margin/Top margin (Reference pattern)
  • Page 118 KX-FPC91 3. Thermal head 1 dot (Reference pattern)
  • Page 119 KX-FPC91 4. Use this test pattern to confirm the torque limiter for Ink film and platen roller timing. (Reference pattern)

  • Page 120: Adjustments

    KX-FPC91 3 ADJUSTMENTS 3.1. ADJUSTING THE FEEDER PRESSURE If misfeeding of a document such as multiple feeding or no feeding occurs frequently, try to adjust the feeder pressure by following the steps below. 1. Open the front cover by pulling up the center part.

  • Page 121: Cordless

    1. Radio Tester : Marconi Model 2295A or later. 2. 4.5 digit Digital Multimeter : B&K Model 2833 or compatible. 3. Oscilloscope, single or dual channel : Panasonic VP-5512P100 or compatible. 4. Telephone Analyzer : B&K Model 1050 or compatible.
  • Page 122 KX-FPC91 3.2.3.3. ADJUSTMENT PREPARATION Please perform the following steps to prepare the ANALOG BOARD for the Adjustment procedure. 1. Power ON and press MENU and then #, 9, 0, 0, 0, , 9, 5, 8 buttons.."TEST MODE" [Cordless Test] appears on the machine´s LCD display.
  • Page 123 KX-FPC91 3.2.3.4. ADJUSTMENT PROCEDURE Once aligned, please reassemble the base unit. Also take off the back of the PORTABLE HANDSET and unsolder the MIC lead short wire if you previously installed it.
  • Page 124 KX-FPC91 RF COAXIAL CABLE Osilloscope (ANALOG BOARD)
  • Page 125 KX-FPC91 3.2.4. HANDSET 3. Apply power to the HANDSET, and press TALK key. 4. Press 5, 8 and 0 keys at the same time. 3.2.4.1. PREPARATION 5. You should hear the HANDSET beep. Release the 3 keys. Please perform the following steps to prepare the HANDSET If you do not hear a beep, remove the power from the for alignment.
  • Page 126 KX-FPC91 Once aligned, please perform the following procedure. 1. Disconnect all equipment and solder connections. Use solder wick to clean up any solder you added. 2. Install the keypad membrane on top of the HANDSET keys. 3. Install the HANDSET P.C.Board.

  • Page 127: Handset Reference Drawing

    KX-FPC91 3.2.4.5. HANDSET REFERENCE DRAWING TP-GND High frequency cable TP-ANT RF UNIT VRfrq Isolation TP-SP Capacitor Item (A) Audio cable Positive lead TP-VSS (−) TP-VSS (−) TP-VDD (+) TP-VDD (+) Isolation TP-MIC Capacitor Item (C) Audio cable Positive lead...

  • Page 128: Disassembly Instructions

    KX-FPC91 4 DISASSEMBLY INSTRUCTIONS 4.1. HOW TO REMOVE THE BOTTOM FRAME...

  • Page 129: How To Remove The Operation Panel Block

    KX-FPC91 4.2. HOW TO REMOVE THE OPERATION PANEL BLOCK...

  • Page 130: How To Remove The Operation Board And Lcd

    KX-FPC91 4.3. HOW TO REMOVE THE OPERATION BOARD AND LCD...

  • Page 131: How To Remove The Analog, Digital, And Power Boards, Ac Inlet And Antenna

    KX-FPC91 4.4. HOW TO REMOVE THE ANALOG, DIGITAL, AND POWER BOARDS, AC INLET AND ANTENNA...

  • Page 132: How To Remove The Motor Block

    KX-FPC91 4.5. HOW TO REMOVE THE MOTOR BLOCK...
  • Page 133 KX-FPC91...

  • Page 134: How To Remove The Separation Roller

    KX-FPC91 4.6. HOW TO REMOVE THE SEPARATION ROLLER...

  • Page 135: How To Remove The Image Sensor (Cis)

    KX-FPC91 4.7. HOW TO REMOVE THE IMAGE SENSOR (CIS)

  • Page 136: How To Remove The Termal Head

    KX-FPC91 4.8. HOW TO REMOVE THE TERMAL HEAD...

  • Page 137: How To Remove The Platen Roller, Back

    KX-FPC91 4.9. HOW TO REMOVE THE PLATEN ROLLER, BACK COVER...

  • Page 138: How To Remove The Pickup Roller

    KX-FPC91 4.10. HOW TO REMOVE THE PICKUP ROLLER...

  • Page 139: How To Remove The Cassette Plate

    KX-FPC91 4.11. HOW TO REMOVE THE CASSETTE PLATE...

  • Page 140: How To Remove The Document Tray

    KX-FPC91 4.12. HOW TO REMOVE THE DOCUMENT TRAY...

  • Page 141: Installation Position Of The Lead Wires

    KX-FPC91 4.13. INSTALLATION POSITION OF THE LEAD WIRES...

  • Page 142: How To Replace The Flat Package Ic

    KX-FPC91 5 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 143: Flat Package Ic Installation Procedure

    KX-FPC91 5.3. 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. 2. Apply flux to all pins of the FLAT PACKAGE IC.

  • Page 144: Circuit Operations

    KX-FPC91 6 CIRCUIT OPERATIONS 6.1. CONNECTION DIAGRAM...

  • Page 145: General Block Diagram

    KX-FPC91 6.2. GENERAL BLOCK DIAGRAM The following is an outline of each device IC on the digital board. (Refer to 6.2.1 GENERAL BLOCK DIAGRAM(P.146).). 1. ASIC (IC501) Composed mainly of an address decoder and a modem control. Controls the general FAX operations.
  • Page 146 KX-FPC91 6.2.1. GENERAL BLOCK DIAGRAM CROSS REFERENCE: 6.7.1 ANALOG UNIT BLOCK DIAGRAM(P.184)

  • Page 147: Control Section

    CN503 SI CLK CIS LED ON IC501 ASIC CN506 ADR [15:13] +24V, +5V, PG, DG RBA [5:0] POWER ADR [12:0] DB [7:0] SUPPLY CN505 THDAT, THCLK, THLAT STB1, STB2 THERMAL IC502 ROM IC503 DRAM IC504 SRAM IC505 MODEM +24V HEAD IC506 D [7:0] D [7:0]...
  • Page 148 KX-FPC91 6.3.2. MEMORY MAP...
  • Page 149 KX-FPC91 6.3.3. ASIC (IC501) This custom IC is used for the general FAX operations. 6. IMAGE DATA RAM: 1. CPU: This memory is programmed into the ASIC and uses 8 KB for the image processing. (See Fig. A.*) This model uses a Z80 equivalent to the CPU operating at 8 MHz.
  • Page 150 KX-FPC91 6.3.4. ROM (IC502) This 512KB ROM (EPROM or MASKROM) carries a common area of 32KB and bank areas which each have 8KB (BK4~BK63). The addresses from 0000H to 7FFFH are for the common area and from 8000H to 9FFFH are for the bank areas.
  • Page 151 KX-FPC91 Descriptions of Pin Distribution (IC501) SIGNAL POWER SUPPLIED VOLTAGE DESCRIPTION AIN1 3.3V CCD IMAGE SIGNAL INPUT AIN2 3.3V THERMISTOR TEMPERATURE WATCH INPUT AIN3 3.3V ----------- AMON 3.3V ANALOG SIGNAL MONITOR TERMINAL VSSB POWER SOURCE (ANALOG GND) VDDB 3.3V POWER SOURCE (ANALOG +3.3V) VDD(3.3V/B)
  • Page 152 KX-FPC91 SIGNAL POWER SUPPLIED VOLTAGE DESCRIPTION XOUT 3.3V SYSTEM CLOCK (24MHz) 3.3V SYSTEM CLOCK (24MHz) POWER SOURCE (GND) VDD (5V) POWER SOURCE (+5V) XTEST 24MHz CLOCK CPUCLK NOT USED TEST1 HIGH FIXED TEST2 HIGH FIXED TEST3 HIGH FIXED TEST4 HIGH FIXED...
  • Page 153 KX-FPC91 SIGNAL POWER SUPPLIED VOLTAGE DESCRIPTION XORESET RESET OUTPUT VDD (5V) POWER SOURCE (+5V) POWER SOURCE (GND) XRESETI RESET INPUT WDERR WATCHED ERROR OUTPUT SIGNAL XRSTSWI INPUT PORT (MPOS) XRSTSWO OUTPUT PORT (VOLIN SEL2) XRESETO NOT USED THERMAL HEAD POWER ON/OFF CONTROL...
  • Page 154 KX-FPC91 6.3.7. RESET CIRCUIT (WATCH DOG TIMER) The output signal from pin 1 of the voltage detect IC (IC507) is input to the ASIC (IC501) 136 pin. Then the output signal from pin 109 of the ASIC (IC501) resets the ASIC.
  • Page 155 KX-FPC91 6.3.8. SRAM AND RTC BACKUP CIRCUIT 1. Function This unit has a lithium battery (BAT501) which works for the SRAM (IC504) and Real Time Clock IC (RTC: inside IC501). The user parameters for autodial numbers, the system setup data and others are stored in the SRAM (IC504).
  • Page 156 KX-FPC91 6.3.9. 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 169 of IC501 becomes a low level. Then when it becomes a high level, it triggers point A In point C, according to the voltage output time, the thermal head´s temperature is detected.

  • Page 157: Facsimile Section

    KX-FPC91 6.4. FACSIMILE SECTION 6.4.1. IMAGE DATA FLOW DURING FACSIMILE OPERATION Copy (Fine, Super-Fine, Half Tone) 1. Line information is read by CIS (to be used as the reference white level) via route1, and is input to IC501. Refer to 6.4.2 BLOCK DIAGRAM(P.158)
  • Page 158 KX-FPC91 6.4.2. BLOCK DIAGRAM...

  • Page 159: Thermal Head

    KX-FPC91 6.4.3. THERMAL HEAD 1. Function This unit utilizes the state of the art thermal printer technology. The ink film is chemically processed. The ink film is comprised of two parts: an ink layer and a base film. When the thermal head contacts this ink film, it emits heat momentarily, and the ink layer is melted and transferred to the paper.
  • Page 160 KX-FPC91...
  • Page 161 KX-FPC91 6.4.4. 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. When an original document is inserted and the start button pressed, pin 20 of IC501 goes to a high level and the transistor Q512 turns on.This applies voltage to the LED array to light it.
  • Page 162 KX-FPC91 6.4.5. STEPPING MOTOR DRIVE CIRCUIT 1. Function The stepping motor works for both transmission and reception. 2. Motor During motor driving, pin 163 of ASIC IC501 becomes a high level, and Q503, Q501 turns ON. As a result, +24V is supplied to the motor coil.
  • Page 163 KX-FPC91 When the motor suspends while it is in the receive mode (about 70~80 msec), pin 163 of ASIC IC501 becomes a low level and Q503 turns OFF. Then Q501 also turns OFF, and instead of +24 V, +5 V is supplied through D501 so that the motor is held in place.

  • Page 164: Gear Section

    KX-FPC91 6.4.6. GEAR SECTION This model provides a motor-driven gear mechanism for transmitting/copying documents and printing fax data. In this chapter, you will see how the gears work to select and operate a mode and how the gear section, sensors and rollers mechanically work during the main operations (FAX transmission, FAX reception and Copy).
  • Page 165 KX-FPC91 6.4.6.2. MODE OPERATION Once a mode is selected, the Drive Motor Gear rotates clockwise (CW) and then the controlling positions of Swing Gears A, B and C determine which gears convey their drive power in each mode. A. Transmit mode (See Fig. A.) : Swing Gear A engages Gear E and conveys its power to the Separation Roller Gear through Gear G and sets the Separation Roller for feeding documents.
  • Page 166 KX-FPC91 B. Paper-Pickup mode (See Fig. B) : Swing Gear C engages Gear H and provides its power to the Pick up Roller Gear and Platen Idler Gear and Pick up Idler Gear. The Gear drive as follows: Swing Arm C→engaging→Gear H→Platen Idler Gear→Pick up Idler Gear→Pickup roller Gear. The Pickup Roller picks up and pre-feeds a recording paper until the recording paper pushes up the Paper Top sensor* lever.
  • Page 167 KX-FPC91 C. Receive mode (See Fig. C.) : After paper pick up mode, Swing Gear B engages Gear C and conveys its power to the Platen Roller Gear and Ink Ribbon Drive Gear through Platen Drive Gear. Then, the Platen Roller feeds recording paper for printing the received data.
  • Page 168 KX-FPC91 D. Copy mode (See Fig. D.) : Documents pre-feeding →Transmit mode go → Recording paper feeding → Pick up mode go. Next Swing Gear A and B engages Gear E and Gear C respectively and conveys these power to the Separation Roller Gear and the Platen Roller Gear.
  • Page 169 KX-FPC91 6.4.6.3. MECHANICAL MOVEMENTS IN THE MAIN OPERATIONS (transmitting documents, receiving faxes and copying) 6.4.6.3.1. IDLE STATUS Note: See “Sensor Locations” in 6.5 SENSORS AND SWITCHES(P.172).
  • Page 170 KX-FPC91 6.4.6.3.2. TRANSMITTING DOCUMENTS CROSS REFERENCE: 2.3.10 SENSOR SECTION(P.88). 6.4.6.3.3. RECEIVING FAX Note: See “Sensor Locations” in 6.5 SENSORS AND SWITCHES(P.172).
  • Page 171 KX-FPC91 6.4.6.3.4. COPYING Note: See “Sensor Locations” in 6.5 SENSORS AND SWITCHES(P.172). CROSS REFERENCE: 2.3.10 SENSOR SECTION(P.88)

  • Page 172: Sensors And Switches

    KX-FPC91 6.5. SENSORS AND SWITCHES All of the sensor and switches are shown below. Sensor Circuit Sensor Sensor or Switch Name Message Error Location Operation Panel SW352 Document set SW [CHECK DOCUMENT] SW353 Document top SW [REMOVE DOCUMENT] Digital PCB...
  • Page 173 KX-FPC91 1. [Document top SW (SW353)] When a document is brought to the read position, the SW becomes ON, and the input signal of IC301-16 pin (Operation) becomes a low level. When there is no document at the read position, the SW becomes OFF, and the input signal of IC301-16 pin (Operation) becomes a high level.
  • Page 174 KX-FPC91 3. [Cover Open/Film End SW (SW501)] When the operation panel cover is closed and a film is set, the SW becomes ON, and the input signal of IC501-130 pin (Digital) becomes a low level. When the cover is opened, the SW becomes OFF, and the input signal of IC501-43 pin (Digital) becomes a high level.
  • Page 175 KX-FPC91 5. [Motor Position Sensor (SW102)] This sensor is a detection switch for recording the position of the CAM. Signal (IC501-81 pin) Home position Low level Other High level...

  • Page 176: Modem Section

    KX-FPC91 6.6. MODEM SECTION 6.6.1. FUNCTION The unit uses a 1 chip modem (IC505) that serves as an interface between the control section for FAX transmission and reception and the telephone line. During a transmitting operation, the digital image signals are modulated and sent to the telephone line.
  • Page 177 KX-FPC91 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. Phase B : Pre-message procedure Phase B is a pre-processing procedure and sequence for confirming the status of the terminal, transmission route, etc., and for terminal control.
  • Page 178 KX-FPC91 6. Explanation of Communication and Compression 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 179 KX-FPC91 Bit No. DIS/DTC Reserved for future T.3 operation features. Transmitter --- T.4 operation Receiver --- T.4 operation Receiver --- T.4 operation 11, 12, 13, 14 Data signaling rate Data signaling rate 0, 0, 0, 0 V.27 ter fall back mode 2400 bit/s, V.27 ter...
  • Page 180 KX-FPC91 Bit No. DIS/DTC 300×300 pels/25.4 mm 300×300 pels/25.4 mm R16×15.4 lines/mm and/or 400×400 pels/25.4 mm R16×15.4 lines/mm and/or 400×400 pels/25.4 mm Inch based resolution preferred Resolution type selection "0" : neuritic based resolution "1" : inch based resolution Metric based resolution preferred Don’t care...
  • Page 181 KX-FPC91 b. Redundancy Compression Process Coding Mode This unit uses one-dimensional MH format.
  • Page 182 KX-FPC91 6.6.2. MODEM CIRCUIT OPERATION The modem (IC505) has all the hardware satisfying the ITU-T standards mentioned previously. When the ASIC IC501 (61) is brought to a low level, the modem (IC505) is chip-selected and the resistors inside IC are selected by the select signals from ASIC (IC501) ADR0-ADR4(pin 83~87).

  • Page 183: Description Of Block Diagram In Analog Section

    KX-FPC91 6.7. DESCRIPTION OF BLOCK DIAGRAM IN ANALOG SECTION 1. Function The analog section serves as an interface between the telephone line. The digital board (IC505) for transmission and reception of FAX signals, switches between the digital board (IC505) and other sections by means of a multiplexer in the NCU section.
  • Page 184 KX-FPC91 6.7.1. ANALOG UNIT BLOCK DIAGRAM...

  • Page 185: Ncu Section

    KX-FPC91 6.8. NCU SECTION 6.8.1. GENERAL This section is the interface between the telephone line and external telephone. It is composed of an EXT. TEL line relay (RL101), bell detection circuit, pulse dial circuit, TAM interface circuit, line amplifier and sidetone circuits and a multiplexer.
  • Page 186 KX-FPC91 6.8.5. LINE AMPLIFIER AND SIDE TONE CIRCUIT 1. Circuit Operation The reception signal output from the line transformer T101 is input to pin (2) of IC101 via C111, R111 and then the signal is amplified at pin (1) of IC101 and sent to the reception system at 10dB.

  • Page 187: Its (Integrated Telephone System) And Monitor

    KX-FPC91 6.9. ITS (Integrated Telephone System) AND MONITOR SECTION 6.9.1. GENERAL During the monitor operation, the speaker output passes through the power amplifier (IC102) [Analog board]. The DTMF signal is output from the modem (IC505: digital board). The alarm tone, the key tone, bell tone, and beep are output from gate array IC501 (digital board).

  • Page 188: Tam Interface Section

    KX-FPC91 6.10. TAM INTERFACE SECTION 6.10.1. FUNCTION If EXT. TAM is selected in the Receive mode, the unit receives documents for FAX calls or the external TAM records a voice message automatically. To switch between the answering machine and facsimile in the EXT. TAM Mode.
  • Page 189 KX-FPC91 6.10.2. CIRCUIT OPERATION The TAM INTERFACE circuit consists of an EXT. TAM HOOK detection circuit, CNG signal from the other party’s detection circuit, VOX detection circuit (to judge sound/no-sound) and RL101 (to separate EXT. TAM). 1. EXT. TAM HOOK detection circuit A bell is received at EXT.

  • Page 190: Operation Board Section

    KX-FPC91 6.11. OPERATION BOARD SECTION The unit consists of a LCD (Liquid crystal display), KEYs and LEDs (light-emitting diodes). They are controlled by the Gate Array (IC301) and ASIC (IC501: on the DIGITAL BOARD). (Fig.-a) The key matrix table is shown below.

  • Page 191: Lcd Section

    KX-FPC91 6.12. LCD SECTION The Gate Array (IC301) works only for writing the ASCII code from the data bus (D4~D7). V0 is supplied for the crystal drive. R303(R377) and R305(R379) are density control resistors. Consequently, in this unit, the timing (positive clock) is generated by the LCD interface circuitry in the gate array (IC301).

  • Page 192: Power Supply Board Section

    KX-FPC91 6.13. 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 193 KX-FPC91 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 194 KX-FPC91 [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 195: Cordless Section

    KX-FPC91 6.14. CORDLESS SECTION 6.14.1. CHARGE CIRCUIT Ultra charge (150 mA) of maximum 4 hours is started soon after the Handset is placed on the base unit. Then it changes to normal charge (60 mA on the average) of 10 hours. Finally the mode changes to trickle charge (18 mA) to prevent overcharging.

  • Page 196: Rx Data Circuit

    KX-FPC91 6.14.3. LINE RECEIVING SIGNAL The Audio signal is input to CN101 of pin 13 from Digital board. IC103 comprises an amplifier, limiter, mute circuit, compander, and LPF. It performs signal processing. The audio signal output from pin 7. At this point (in the talk mode), the DTMF tones, pulse dial tones, and data transferred between the Handset and base unit is input to the modulator circuit.

  • Page 197: Handset Section

    KX-FPC91 6.15. HANDSET SECTION 6.15.1. BLOCK DIAGRAM The signal flow of the handset is explained in Fig.A. The diagram´s frequency is shown as the first channel´s value. Receiving Route 1. The RF (Radio Frequency) receiving signal modulated into 900MHz band entered from the antenna is separated into a transmitting signal in the duplexer constructed from the band pass filter, etc., and enters the receiving route.
  • Page 198 KX-FPC91...
  • Page 199 KX-FPC91 6.15.2. CONTROL BLOCK...

  • Page 200: Carrier Detection Circuit

    KX-FPC91 6.15.3. CARRIER DETECTION CIRCUIT The handset detects the carrier level (availability of the carrier) from the base unit. The general purposes of it are as follows. 1. To release the standby mode, and detect the availability of the carrier from the base unit.

  • Page 201: Security Code

    KX-FPC91 6.15.4. SECURITY CODE The cordless telephone handset and base unit have individual security codes. If they are not the same, they cannot link mutually. If the handset of your neighbor´s cordless telephone can link with the base unit of your cordless telephone, your neighbor´s telephone bill may be charged to yours.
  • Page 202 KX-FPC91 6.15.6. DATA RECEPTION CIRCUIT The wave detection signal from the RF UNIT has high frequency elements eliminated by a CR filter consisting of R213 and C212. Then it is amplified by DATA Amp1 and, once again, high frequency elements are eliminated by R218 and C216. After this, the signal is amplified by DATA Amp2 and input to pin 25 of the CPU.
  • Page 203 KX-FPC91 6.15.9. RESET/POWER DOWN/BATTERY LOW/ID When the battery is installed in the Handset, the reset circuit consisting of R217 and inside IC201 functions, inputting a reset signal to the CPU. This ensures that the unit will operate normally without the user´s needing to switch the power off and on. When the voltage from the batteries drops to 3.5 V, 3.5 V voltage detector inside IC201 operates and output a battery low signal to the CPU.
  • Page 204 KX-FPC91 6.15.11. CPU DATA(IC901)
  • Page 205 KX-FPC91 6.15.12. EXPLANATION OF CPU DATA COMMUNICATION 6.15.12.1. CALLING 6.15.12.2. TO TERMINATE COMMUNICATION...
  • Page 206 KX-FPC91 6.15.12.3. RINGING After detecting the Ring signal from circuit, Base Unit sends a ring signal DATA (Ring), then the Handset starts ringing. 6.15.12.4. PORTS FOR TRANSMITTING AND RECEIVING OF DATA Handset: transmitting ... 44 Pin receiving ... 25 Pin Base Unit: transmitting ...

  • Page 207: Base Unit

    KX-FPC91 6.15.12.5. WAVEFORM OF DATA USED FOR CORDLESS TRANSMISSION AND RECEPTION The DATA which is transmitted from the Handset to the Base Unit is combination of DATA 0, DATA 1, DATA Delimit, Pre data and End data. The DATA which is transmitted from the Base Unit to the Handset is combination of DATA 0, DATA 1, DATA Delimt, Pre data and End data.

  • Page 208: When Linking

    KX-FPC91 6.15.12.6. WHEN LINKING When LINKing from the Handset (when becoming STBY to TALK), DATA is transmitted in above format. The combined portion of DATA 0 and DATA 1 is transmitted in LINK requesting DATA (40bit) format first. Then, when LINK OK (ACK-OK) DATA (46bit) is returned from the Base Unit, it is sent as LINK from DATA after changing the combination of DATA 0 and DATA 1.
  • Page 209 KX-FPC91 6.15.12.9. FREQUENCY TABLE (MHz)

  • Page 210: Terminal Guide Of The Ic Z S Transistors And Diodes

    KX-FPC91 7 TERMINAL GUIDE OF THE IC´S TRANSISTORS AND DIODES...

  • Page 211: Fixtures And Tools

    KX-FPC91 8 FIXTURES AND TOOLS...

  • Page 212: Cabinet, Mechanical And Electrical Parts Location

    KX-FPC91 9 CABINET, MECHANICAL AND ELECTRICAL PARTS LOCATION 9.1. OPERATION PANEL SECTION...

  • Page 213: Upper Cabinet Section

    KX-FPC91 9.2. UPPER CABINET SECTION...
  • Page 214 KX-FPC91 9.2.1. BACK COVER SECTION 9.2.1.1. BACK COVER 1...
  • Page 215 KX-FPC91 9.2.1.2. BACK COVER 2...

  • Page 216: Lower/P.c.b. Section

    KX-FPC91 9.3. LOWER/P.C.B. SECTION CROSS REFERENCE: 9.1 OPERATION PANEL SECTION(P.212)

  • Page 217: Motor Section

    KX-FPC91 9.4. MOTOR SECTION...

  • Page 218: Handset Section

    KX-FPC91 9.5. HANDSET SECTION...

  • Page 219: Actual Size Of Screws

    KX-FPC91 9.6. ACTUAL SIZE OF SCREWS...

  • Page 220: Accessories And Packing Materials

    KX-FPC91 10 ACCESSORIES AND PACKING MATERIALS...

  • Page 221: Replacement Parts List

    KX-FPC91 11 REPLACEMENT PARTS LIST This replacement parts list is for KX-FPC91 only. Ref. Part No. Part Name & Description Remarks Refer to the simplified manual (cover) for other areas. PFBX1096X1 BUTTON, STOP/VOLUME Notes: PFBX1097V1 BUTTON, FUNCTION PFBX1095X1 BUTTON, DIALER 1.

  • Page 222: Digital Board Parts

    KX-FPC91 Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks PFDG1156Z GEAR, F PFDG1165Y GEAR, PLATE PFHR1183Z ARM, I PFDE1130Y1 LEVER, LOCK PFJQ35S1S15D DC MOTOR PFUS1258Z SPRING, LOCK LEVER PFDG1154Z GEAR, D2 PFHS1029Z...
  • Page 223 KX-FPC91 Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks IC514 AN6383SB (CRYSTAL OSCILLATORS) (TRANSISTORS) X501 PFVCCFS32Z CRYSTAL OSCILLATOR Q501 2SB1322 TRANSISTOR(SI) X502 PFVC2457IZAT CRYSTAL OSCILLATOR Q502 PQVTDTC114EU TRANSISTOR(SI) X503 PFVC32256ZAT CRYSTAL OSCILLATOR...
  • Page 224 KX-FPC91 Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks R544 ERJ3GEYJ222 2.2k R546 ERJ3GEYJ472 4.7k R547 ERJ3EKF1101 (CAPACITORS) R548 ERJ3EKF4701 R549 ERJ3GEYJ104 100k C501 ECUV1H120JCV C502 PQCUV1H473MD 0.047 R550 ERJ3GEYJ101 C504 PQCUV1H104ZF...

  • Page 225: Analog Board Parts

    KX-FPC91 Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks C580 ECEA1CKS100 (DIODES) C581 ECUV1H561JCV 560P C582 ECUV1H102KBV 0.001 D101 PFVDDGS1ZB60 DIODE(SI) C583 ECUV1H104ZFV D102 MA4056 DIODE(SI) C584 ECUV1C104KBV D103 MA4056 DIODE(SI) C586 PQCUV1C224KB 0.22...
  • Page 226 KX-FPC91 Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks R178 ERJ3GEYJ333 (THERMISTOR) R179 ERJ3GEYJ822 8.2k POS101 PFRT002 THERMISTOR R184 ERJ3GEYJ153 R185 ERJ3GEYJ153 R186 ERJ3GEYJ473 (PHOTO ELECTRIC TRANSDUCERS) R187 ERJ3GEYJ333 R188 ERJ3GEYJ333 PC101...

  • Page 227: Operation Board Parts

    KX-FPC91 Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks C114 ECUV1C123KBV 0.012 C525 ECUV1H103KBV 0.01 C115 ECUV1H181JCV 180P C526 ECUV1H103KBV 0.01 C116 ECUV1H181JCV 180P C528 ECUV1H104ZFV C117 ECEA1HKS4R7 C119 ECEA1HKS4R7 C122 ECUV1C104KBV 11.4.

  • Page 228: Power Supply Board Parts

    KX-FPC91 Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks (RESISTORS) (COMPONENTS PARTS) R301 ERJ3GEYJ471 R302 ERJ3GEYJ471 L103 EXCELDR35 COMPONENTS PARTS R303 ERJ3GEYJ273 R305 ERJ3GEYJ681 (CONNECTORS) R310 ERJ3GEYJ221 R314 ERJ3GEYJ472 4.7K CN31 PQJP2D98Z...

  • Page 229: Handset Board

    KX-FPC91 Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks C109 ECA1VHG470 E500 PQJM122Z MICROPHONE E501 PQEFBDB111GF BUZZER C119 ECKD3A221KBP 220P E502 PFHX1287Z INSULATOR, RF SHEET C121 ECUV1H472KBN 0.0047 C122 ECUV1C224KBX 0.22 (VARIABLE RESISTORS)

  • Page 230: Charge Board

    KX-FPC91 Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks R254 ERJ3GEYJ222 2.2k C242 ECUV1C104KBV C244 ECUV1H472KBV 0.0047 R260 ERJ3GEYJ104 100k C246 ECUV1H101JCV 100P C247 ECUV1C104KBV R271 ERJ3GEY0R00 R272 ERJ3GEY0R00 C251 ECUV1H822KBV 0.0082...
  • Page 231 KX-FPC91 Ref. Part No. Part Name & Description Remarks PFZZ11K13Z CONNECTOR, 11P PFZZ5K13Z CONNECTOR, 5P PQZZ11K4Z CONNECTOR, 11P PQZZ2K13Z CONNECTOR, 2P PFZZ10K3Z CONNECTOR, 10P EC10 PFZZ17K2Z CONNECTOR, 17P KM79811245C0 BASIC FACSIMILE TECHNIQUE (For training service technicians) Note: Tools and Extension Cords are useful for servicing.

  • Page 232: For The Schematic Diagrams

    KX-FPC91 12 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 233: Printed Circuit Board

    C512 C513 C511 R512 C635 R533 L525 D508 R535 R536 R543 R537 R516 DA501 R538 R518 R539 R540 C546 Q507 R542 R541 R548 R547 R521 R623 R511 R523 C541 R633 C542 C543 R510 R534 C510 R528 R509 C526 R515 R530 C501 R514 R615...

  • Page 234: Digital Board: Component View

    KX-FPC91 13.2. DIGITAL BOARD: COMPONENT VIEW (COMPONENT VIEW) CN506 CN502 CN505 J502 D502 Q511 PS501 R620 R594 R619 R556 C509 L518 F502 IC506 1.25A R506 C565 Q501 IC508 C502 CN510 R513 +24V IC502 R505 IC512 D505 Q503 REF-CH +5VD Q504...

  • Page 235: Analog Board: Bottom View

    C527 L105 L104 JJ132 C207 L101 C206 L102 C204 R204 R207 R202 C200 JJ133 C202 R206 R200 L200 R208 C205 R203 C203 C102 R209 Q103 R205 R201 JJ134 C529 D101 C104 C165 C179 R163 C178 R145 R171 R162 R174 C209 R146 C171 R170...

  • Page 236: Analog Board: Component View

    KX-FPC91 13.4. ANALOG BOARD: COMPONENT VIEW PFUP1202ZA F201:250mA 125V A B C 1 2 3 4 5 6 7 8 9 A B C CN101 CN106 A B C D E F G JJ111 a b c d J202 JJ110...

  • Page 237: Operation Board

    KX-FPC91 13.5. OPERATION BOARD (COMPONENT VIEW) (BOTTOM VIEW) J321 R378 R377 R379 R303 C366 C311 C365 R305 J323 J322 R386 C314 LED301 R310 R318 J304 C310 R319 R311 J333 C361 LED302 C305 R312 C364 J305 J301 R320 J306 C363 C308...

  • Page 238: Power Supply Board

    KX-FPC91 13.6. POWER SUPPLY BOARD (COMPONENT VIEW) (BOTTOM VIEW) SAF989UC CAUTION AC125V 5A C101 C101 F101 F101 AC125V 5A D104 D104 D103 D103 D102 D102 D101 D101 C102 C102 C103 C103 R137 R102 R102 R103 R103 C105 C105 C106 C106...

  • Page 239: Handset Board And Charge Board

    KX-FPC91 13.7. HANDSET BOARD AND CHARGE BOARD (HANDSET BOARD) (COMPONENT VIEW) (CHARGE BOARD) CN651 A B C D L653 1 2 3 4 5 a b c d L652 AUTO L651 (BOTTOM VIEW) D652 D653 D651 Q203 D204 C271 CHARGE...

  • Page 240: Memo

    KX-FPC91 13.8. MEMO...

  • Page 241: Schematic Diagram

    KX-FPC91 14 SCHEMATIC DIAGRAM 14.1. DIGITAL BOARD +5VD C588 Z0.1 +24VF +24V +5VD +5VA NOT USED FAX TX Signal +5VD R616 +5VD IC502 IC503 IC512 FAX RX Signal TO POWER UNIT IC504 +3.3V/BATT +3.3V +5VD A[0] D[0] A[4] D[0] CN506...

  • Page 242: Analog Board

    KX-FPC91 14.2. ANALOG BOARD R115 (Not Used) FAX TX Signal T103 +5VD +5VD JJ115 NC R117 FAX RX Signal JJ120 D101 R118 R111 C111 C164 R101 L101 T101 JJ103 TO LINE 100k K0.1u 50V 4.7u CN102 JJ101 HANDSET, MONITOR C115...

  • Page 243: Operation Board

    KX-FPC91 14.3. OPERATION BOARD TO LCD CN302 TO DIGITAL LCD CONTRAST CN301 1 GND RESET 2 +5VLCD KSCLK 3 V0 KTXD 4 RS KRXD 5 R/W TO COB KLATCH KSTART 7 D0 R301 JOG1 1 JOG1 8 D1 JOG2 R376...
  • Page 244 KX-FPC91 14.4. POWER SUPPLY BOARD Cycle = 12.4 µs T101 Cycle = 12.4 µs TRANS R104 -55V CN301 100K/1 D201 D102 D101 D106 C202 D103 D104 R128 1000p/1K Cycle = 12.4 µs R223 C205 Q101 R105 1/50 C102 0.22/2 270V IC201 0.047...

  • Page 245: Handset Board

    KX-FPC91 14.5. HANDSET BOARD D201 3.9 V D204 L201 CHG(+) TX Signal CN202 RX Signal L202 2 BATT+ CHG(C) 1 BATT- 1kHz TONE 6kHzdivi L203 CHG(-) L204 75 mV 55 mV C269 RXREG TXREG 3.0V C218 K0.01u RESET 36mA RXSWOUT...
  • Page 246 KX-FPC91 14.6. CHARGE BOARD CN651 LED651 R651 HLED L651 CHG(+) L652 CN652 L653 CHG(C) CN653 CHG(-) CN654...
  • Page 247 KX-FPC91 Y(Q) KXFPC91 Printed in Japan...

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