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Panasonic KX-FC255CX-S Service Manual

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Compact Plain Paper FAX with DECT
KX-FC255CX-S
Silver version
(for Asia and Middle Near East)
© 2006 Matsushita Electric Industrial Co., Ltd.
All rights reserved. Unauthorized copying and distri-
bution is a violation of law.
ORDER NO. KMF0610062CE

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  • Page 1 ORDER NO. KMF0610062CE Compact Plain Paper FAX with DECT KX-FC255CX-S Silver version (for Asia and Middle Near East) © 2006 Matsushita Electric Industrial Co., Ltd. All rights reserved. Unauthorized copying and distri- bution is a violation of law.

  • Page 2: Table Of Contents

    KX-FC255CX-S TABLE OF CONTENTS PAGE PAGE 1 Safety Precautions -----------------------------------------------3 14 Disassembly and Assembly Instructions ------------- 141 1.1. For Service Technicians ----------------------------------3 14.1. General Section ----------------------------------------- 141 1.2. AC Caution---------------------------------------------------3 14.2. Disassembly Flowchart-------------------------------- 142 1.3. Personal Safety Precautions ----------------------------4 14.3. Disassembly Procedure------------------------------- 145 1.4.

  • Page 3: Safety Precautions

    KX-FC255CX-S 1 Safety Precaution 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 4: Personal Safety Precautions

    KX-FC255CX-S 1.3. Personal Safety Precautions 1.3.1. Moving Sections of the Unit Be careful not to let your hair, clothes, fingers, accessories, etc., become caught in any moving sections of the unit. The moving sections of the unit are the rollers and a gear. There is a separation roller and a document feed roller which are rotated by the document feed motor.

  • Page 5: Service Precautions

    KX-FC255CX-S 1.4. Service Precautions 1.4.1. Precautions to Prevent Damage from Static Electricity Electrical charges accumulate on a person. For instance, clothes rubbing together can damage electric elements or change their electrical characteristics. In order to prevent static electricity, touch a metallic part that is grounded to release the static electricity.

  • Page 6: Warning

    KX-FC255CX-S 2 Warning 2.1. 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 con- tains lead. We will use PbF solder when discussing the lead free solder used in our manufacturing process which is made from Tin (Sn), Silver, (Ag), and Copper, (Cu).

  • Page 7: Insulation Resistance Test

    KX-FC255CX-S 2.2. Insulation Resistance Test 1. Unplug the power cord and short the two prongs of the plug with a jumper wire. 2. Turn on the power switch. 3. Measure the resistance value with an ohmmeter between the jumpered AC plug and each exposed metal cabinet part (screw heads, control shafts, bottom frame, etc.).

  • Page 8: Specifications

    KX-FC255CX-S 3 Specifications Any details given in these instructions are subject to change without notice. 3.1. Base Unit Applicable Lines: Public Switched Telephone Network Document Size: Max. 216 mm in width, Max. 600 mm in length Effective Scanning Width: 208 mm A4: 210 mm ×...

  • Page 9: Cordless Handset

    KX-FC255CX-S 3.2. Cordless Handset Standard: DECT (Digital Enhanced Cordless Telecommunications) GAP (Generic Access Profile) Number of Channels: 120 Duplex channels Frequency Range: 1.88 GHz to 1.9 GHz Duplex Procedure: TDMA (Time Division Multiple Access) Channel Spacing: 1,728 kHz Bit Rate:...

  • Page 10: General/Introduction

    KX-A272 DECT repeater ------------------- To ensure the unit operates properly, we recommend the use of a Panasonic replacement film. The ink film is not reusable. Do not rewind and use the ink film again. Maximum capacity of 750mAh. 5 Features...

  • Page 11: Technical Descriptions

    KX-FC255CX-S 6 Technical Descriptions 6.1. Connection Diagram...

  • Page 12: General Block

    KX-FC255CX-S 6.2. General Block The following is an outline of each device IC on the digital board. (Refer to General Block Diagram (P.13).). 1. ASIC (IC10) Composed mainly of an address decoder and a modem control. Controls the general FAX operations.
  • Page 13 KX-FC255CX-S 6.2.1. General Block Diagram...

  • Page 14: Control (Facsimile) Section

    KX-FC255CX-S 6.3. Control (Facsimile) Section 6.3.1. ASIC (IC10) 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 This model uses a Z80 equivalent to the CPU operating KB for the image processing.
  • Page 15 KX-FC255CX-S 6.3.4. Reset Circuit (Watch Dog Timer) The output signal (reset) from pin 2 of the voltage detect IC (IC10) is input to the ASIC (IC10) 114 pin. 1. During a momentary power interruption, a positive reset pulse of 60 msec is generated and the system is reset completely.
  • Page 16 KX-FC255CX-S 6.3.5. 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 IC10 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 17: Facsimile Section

    KX-FC255CX-S 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 IC10. Refer to Block Dia- gram (P.18)
  • Page 18 KX-FC255CX-S 6.4.2. Block Diagram...
  • Page 19 KX-FC255CX-S 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 20 KX-FC255CX-S...
  • Page 21 KX-FC255CX-S 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 138 of IC10 goes to a low level and Q20 are turned ON, pin 34 of IC10 goes to a high level and the transistor Q21 turns on.This applies voltage to the LED array to light it.
  • Page 22 KX-FC255CX-S 6.4.5. 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. 2. Circuit Operation During motor driving, pin 124 of ASIC IC10 becomes a high level, and Q403, Q402 turns ON. As a result, +24V is supplied to the motor coil.
  • Page 23 KX-FC255CX-S When the motor suspends while it is in the receive mode (about 70~80 msec), pin 124 of ASIC IC10 becomes a low level and Q403 turns OFF. Then Q402 also turns OFF, and instead of +24 V, +6 V is supplied through D401 so that the motor is held in place.

  • Page 24: Sensor And Switches

    KX-FC255CX-S 6.5. Sensor and Switches All of the sensor and switches are shown below. Sensor Circuit Location Sensor Sensor or Switch Name Error Message Operation Panel SW351 Document top sensor [REMOVE DOCUMENT] SW352 Document set sensor [CHECK DOCUMENT] Sensor P.C.Board...
  • Page 25 KX-FC255CX-S 6.5.1. Document Top Sensor (SW351) When a document is brought to the read position, the SW turns ON, and the input signal of IC301-6 pin (Operation Board) becomes a low level. When there is no document at the read position, the SW turns OFF, and the input signal of IC301-6 pin (Operation Board) becomes a high level.
  • Page 26 KX-FC255CX-S 6.5.3. Paper Top Sensor (SW1001) When the recording paper is loaded on the print head or the recording paper cover is opened, the paper top sensor SW turns ON, and the input signal of IC10-43 pin (Digital Board) becomes a low level. Usually, the SW turns OFF, and the input signal of IC10-43 pin (Digital Board) becomes a high level.
  • Page 27 KX-FC255CX-S 6.5.5. Film End Sensor (SW1003) When the operation panel cover is closed and a film is set, the SW turns ON, and the input signal of IC10-39 pin (Digital) becomes a low level. When the cover is opened, the SW turns OFF, and the input signal of IC10-39 pin (Digital) becomes a high level.
  • Page 28 KX-FC255CX-S 6.5.7. Hook Switch (SW1501) When the handset is lifted, the switch turns ON, and the signal at pin 19 of IC10 becomes low. When the handset is returned, the switch turns OFF, and the signal at pin 19 of IC10 becomes high.

  • Page 29: Modem Section

    KX-FC255CX-S 6.6. Modem Section 6.6.1. Function The unit uses a 1 chip modem (IC3) 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 30 KX-FC255CX-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. 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 31 KX-FC255CX-S 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 32 KX-FC255CX-S Bit No. DIS/DTC 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 0,1,0,0 V.27 ter 4800 bit/s, V.27 ter 1,0,0,0 V.29 9600 bit/s, V.29 1,1,0,0 V.27 ter and V.29 7200 bit/s, V.29...
  • Page 33 KX-FC255CX-S Bit No. DIS/DTC Extend field Extend field R8×15.4 lines/mm R8×15.4 lines/mm 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": neritic based resolution "1": inch based resolution...
  • Page 34 KX-FC255CX-S b. Redundancy Compression Process Coding Mode This unit uses one-dimensional MH format.
  • Page 35 KX-FC255CX-S 6.6.2. Modem Circuit Operation The modem (IC3) has all the hardware satisfying the CCITT standards mentioned previously. When the ASIC IC10 (61) is brought to a low level, the modem (IC3) is chip-selected and the resistors inside IC are selected by the select signals from ASIC (IC10) ADR0-ADR4.

  • Page 36: Ncu Section

    KX-FC255CX-S 6.7. NCU Section General 6.7.1. It is composed of bell detection circuit, pulse dial circuit, line amplifier, sidetone circuits. 6.7.2. Bell Detection Circuit 1. Circuit Operation The signal waveform for each point is indicated below. The signal (low level section) input to pin 10 of BBIC IC4 on the digital board.
  • Page 37 KX-FC255CX-S 6.7.6. Calling Line Identification Circuit 1. Function This unit is compatible with the Caller ID service offered by your local telephone company. To use this feature, you must sub- scribe to a Caller ID service. The data for the caller ID from the telephone exchange is sent during the interval between the first and second rings of the bell signal.

  • Page 38: Its (Integrated Telephone System) And Monitor Section

    KX-FC255CX-S 6.8. ITS (Integrated Telephone System) and Monitor Section 6.8.1. Speakerphone Circuit Function This circuit controls the automatic switching of the transmitted and received signals, to and from the telephone line, when the unit is used in the hands-free mode.

  • Page 39: Transmitter / Receiver (Cordless)

    KX-FC255CX-S 6.9. Transmitter / Receiver (Cordless) Base Unit and Cordless Handset mainly consist of RF Module and DECT BBIC. Base Unit and Cordless Handset transmit/receive voice signal and data signal through the antenna on carrier frequency. 6.9.1. Transmitter Block The voice signal input from the TEL LINE interface goes to RF Module (IC28) through DECT BBIC (IC4).

  • Page 40: Operation Board Section

    (IC301) and ASIC (IC10: on the DIGITAL BOARD). The key matrix table is shown below. LCD MODULE CN302 ASIC KSL0~4 CN206 CN301 GATE ARRAY IC10 IC301 KEYS KIN0~7 MATRIX XLED9, 10 LED2 AUTO ANSWER DOCUMENT TOP SENSOR DOCUMENT SET SENSOR DIGITAL BOARD OPERATION BOARD KX-FC255CX-S : OPERATION BOARD BLOCK DIAGRAM...

  • Page 41: Lcd Section

    KX-FC255CX-S 6.11. 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. R310, R311 and R312 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 42: Power Supply Board Section

    KX-FC255CX-S 6.12. Power Supply Board Section This power supply board uses the switching regulator method. Block Diagram Input Input Rectifier Circuit C106 Output Circuit Surge Circuit D110 Absorber Converter Circuit Circuit R104 A-B Voltage Wave Form Q101 Kick-on Surge Voltage...
  • Page 43 KX-FC255CX-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 44 KX-FC255CX-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 tran- sistor.

  • Page 45: Cordless Handset

    CIRCUIT CONTACTS CHARGE DETECT Q4,Q5,Q9 10.368 CHARGE(-) EEPROM BATTERY ON SWITCH VBAT1 SWITCHED BATTERY SUPPLY TERMINAL DC/DC-SWITCH 2.5V 4.0V 2.5V ROWS 1,12,40,76 1.8V 1.8V KEYPAD 27,28,34,35,36,74 COLUMNS RESET BBIC LCD-BACK LIGHT KEY-BACK LIGHT Ringer LED KX-FC255CX-S: CORDLESS HANDSET BLOCK DIAGRAM...
  • Page 46 KX-FC255CX-S 6.13.2. Circuit Operation (Cordless Handset) 6.13.2.1. Outline Handset consists of the following ICs as shown in Block Diagram (P.45). • DECT BBIC (Base Band IC): IC1 - All data signals (forming/analyzing ACK or CMD signal) - All interfaces (ex: Key, Detector Circuit, Charge, DC/DC Converter, EEPROM, LCD) •...

  • Page 47: Location Of Controls And Components

    KX-FC255CX-S 7 Location of Controls and Components 7.1. Overview 7.1.1. Base Unit 7.1.2. Cordless Handset (1) Charge indicator Ringer indicator Message indicator (2) Receiver (3) Microphone (4) Headset socket (5) Speaker (1) Document guides (2) Paper tray (3) Metal recording paper guide...

  • Page 48: Control Panel

    KX-FC255CX-S 7.2. Control Panel 7.2.1. Base Unit (17) [TONE] • To change from pulse to tone temporarily during dialling when your line has rotary pulse service. You can also use tone dial service by changing feature #13 on Program Mode Table (P.98).
  • Page 49 KX-FC255CX-S Display Icons Menu Icons When in standby mode, pressing the middle soft key reveals the cordless handset’s main menu. From here you can access various features and settings. Soft Keys The cordless handset features 3 soft keys. By pressing a soft key, you can select the feature or operation indicated by the soft key icon shown directly above it.

  • Page 50: Installation Instructions

    KX-FC255CX-S 8 Installation Instructions 8.1. Installation Space 8.2. Connections The space required to install the unit is shown below. Important: • The unit will not function when there is a power failure. The dimensions given are necessary for the unit to operate effi- To make calls in emergency situations, you should con- ciently.

  • Page 51: Battery Charge

    • The charger can be mounted on the wall, if required. set is placed on the charger. Caution: • USE ONLY WITH the included Panasonic AC adaptor. Note: • The AC adaptor must remain connected at all times. (It • To ensure the battery charges properly, clean the charge is normal for the adaptor to feel warm during use.)

  • Page 52: Installing The Ink Film

    KX-FC255CX-S 8.4. Installing the Ink film • Make sure the blue gear ( ) and white gear ( ) are installed as shown. The included film roll is a starter ink film. 1. Open the front cover. 2. Release the back cover by pushing the green button ( 5.

  • Page 53: Installing The Paper Tray

    KX-FC255CX-S 8.5. Installing the Paper Tray Correct Pull up the metal recording paper guide ( ), then install the paper tray ( Incorrect 6. Close the back cover securely by pushing down on the • Make sure the arrows on the paper tray and the unit match.

  • Page 54: Installing The Recording Paper

    KX-FC255CX-S 8.6. Installing the Recording Paper Document requirements The unit can hold up to 20 sheets of 64 g/m to 80 g/m paper. 1. Fan the paper to prevent paper jams. 2. Insert the paper gently, print-side down ( • Do not force the paper into the paper tray.

  • Page 55: Battery Installation / Replacement

    Optional Accessories (P.10). that it appears on the top of each page sent. • When replacing batteries, we recommend using the Panasonic rechargeable batteries noted on Optional Accessories (P.10). • Wipe the battery ends ( ) with a dry cloth.

  • Page 56: Cordless Handset Programming

    KX-FC255CX-S 9.2. Cordless Handset Programming 9.2.1. Cordless Handset Features...
  • Page 57 KX-FC255CX-S Note: Refer to Program Mode Table (P.98).

  • Page 58: Test Mode

    KX-FC255CX-S 10 Test Mode 10.1. Facsimile Section The codes listed below can be used to perform simple checks for 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. To do this, you set the Service mode (Refer to Operation (P.61).) first, then operate the below test items.
  • Page 59 KX-FC255CX-S 10.1.1. Button Code Table Code Button Name Code Code Button Name NO INPUT GREETING RECORD ---- STOP MEMO FAX START GREETING CHECK COPY ERASE SP-PHONE PLAY BACK LOCATOR / INTERCOM MUTE AUTO ANSWER MENU PRINT REPORT [+] VOLUME [—] VOLUME...
  • Page 60 KX-FC255CX-S 10.1.2. Print Test Pattern 1. Platen roller 3. Thermal head 1 dot 2. Left margin / Top margin 4. Use this test pattern to confirm the torque limiter for Ink film and platen roller timing.

  • Page 61: Service Mode

    KX-FC255CX-S 11 Service Mode 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. 11.1. Base Unit 11.1.1.
  • Page 62 KX-FC255CX-S 11.1.1.3. Service Function Table Code Function Set Value Effective Default Remarks Range Pause time set 1: 3s (Short) 1, 2 ---------- 2: 5s (Long) VOX sense 1:High 2:Low 1, 2 When the TAM (or EXT TAM) does not stop recording the ICM because noise is detected on the telephone line, change this setting to "LOW".
  • Page 63 KX-FC255CX-S Code Function Set Value Effective Default Remarks Range FAX auto redial time disconnection X second 001~999 Sets the FAX redial interval during FAX communica- time set tion. CNG transmit select 1:OFF Lets you select the CNG output during FAX transmis- 2:ALL sion.
  • Page 64 KX-FC255CX-S 11.1.1.4. Memory Clear Specification Execute Service Mode #550 when you want to reset the all setting data keeping the user information. Execute Service Mode #710 to clear the user information in case that Main Unit is recycled. Note: • Please restart a power supply after clearing a memory.

  • Page 65: Handset

    KX-FC255CX-S 11.2. Handset...
  • Page 66 KX-FC255CX-S Frequently Used Items (Cordless Handset) ex.) Items (*2) Address Default Data New Data Possible Adjusted Possible Adjusted Remarks Value MAX (hex) Value MIN (hex) Sending level 00 06 Adjusted value Given value (*3) Receiving level 00 07 Adjusted value...

  • Page 67: The Example Of The Printed List

    KX-FC255CX-S 11.3. The Example of the Printed List 11.3.1. User Mode Note: The above values are the default values.
  • Page 68 KX-FC255CX-S 11.3.2. Service Mode Settings Note: The above values are the default values.
  • Page 69 KX-FC255CX-S 11.3.3. History Note: See the following descriptions of this report. Item No. (1) ~ (44) are corresponding to the listed items in Descriptions of the History Report (P.70).
  • Page 70 KX-FC255CX-S 11.3.3.1. Descriptions of the History Report (1) SOFTWARE VERSION (22) NUMBER OF RECEIVE FLASH ROM version The number of pages received. (2) SUM (23) NUMBER OF SENDING FLASH ROM internal data calculation. The number of pages sent. (3) YOUR LOGO (24) NUMBER OF CALLER ID The user logo recorded in the unit.

  • Page 71: Troubleshooting Guide

    KX-FC255CX-S 12 Troubleshooting Guide 12.1. Troubleshooting Summary After confirming the problem by asking the user, troubleshoot according to the instructions and observe the following precautions. 12.1.1. 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 72: Error Messages-Display

    KX-FC255CX-S 12.2. Error Messages-Display 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. 12.2.1. Base Unit • The back cover is open. Close the back cover firmly.
  • Page 73 —Add 2 pauses at the end of the telephone number or dial manually. • Please use genuine Panasonic replacement film. • The unit is too hot. Stop using the unit for a while and let the (Refer to Optional Accessories (P.10).) unit cool down.
  • Page 74 KX-FC255CX-S 12.2.2. Cordless Handset • Erase unnecessary messages. • Recording was too short. Try again. • Phonebook copy failed. Confirm the destination unit is in standby mode and try again. • The destination unit’s phonebook memory is full. Erase the unnecessary phonebook items from the destination unit and try again.

  • Page 75: Error Messages-Report

    KX-FC255CX-S 12.3. Error Messages-Report 12.3.1. Journal Report If a problem occurs during fax transmission or reception, one of the following messages will be printed on the sending and jour- nal reports. How to output the Journal Report 1. Press [PRINT REPORT].
  • Page 76 KX-FC255CX-S Countermeasure...
  • Page 77 KX-FC255CX-S REFERENCE: Test Mode (P.58)
  • Page 78 KX-FC255CX-S REFERENCE: Test Mode (P.58)
  • Page 79 KX-FC255CX-S REFERENCE: Test Mode (P.58)
  • Page 80 KX-FC255CX-S REFERENCE: Test Mode (P.58)
  • Page 81 KX-FC255CX-S...
  • Page 82 KX-FC255CX-S REFERENCE: Test Mode (P.58)
  • Page 83 KX-FC255CX-S REFERENCE: Test Mode (P.58)
  • Page 84 KX-FC255CX-S 12.3.2. Special Service Journal Reports Journal 2 and Journal 3 shown below, which are special journals giving the additional detailed information about the latest 35 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 85 KX-FC255CX-S 12.3.2.1. Journal 2 Refer to JOURNAL 2 in Printout Example (P.86). Journal 2 displays the additional detailed information about the last 35 communications. Descriptions: (1) RCV. MODE Indicates which receive mode the unit was in when the unit received a fax message.
  • Page 86 KX-FC255CX-S 12.3.2.2. Journal 3 Refer to JOURNAL 3 in Printout Example (P.86). Descriptions: (6) ENCODE (9) ERROR LINE(RX) Compression Code: MH/MR When an error occurs while receiving a fax, this shows the number of error lines. (7) MSLT MSLT means Minimum Scan Line Time. Used only at the (10) MAKER CODE factory.
  • Page 87 KX-FC255CX-S...
  • Page 88 KX-FC255CX-S 12.3.3. Communication Section Find the problem in the table shown below, and refer to the corresponding troubleshooting procedure in Defective Facsimile Section (P.89). Symptom Reference Content Possible cause 1 The paper is not fed properly when faxing. Problem with the feeding mech- Transmit Problem P.89...
  • Page 89 KX-FC255CX-S 12.3.3.1. Defective Facsimile Section 12.3.3.1.1. Transmit Problem REFERENCE: (*1): Operation Panel Section (P.128) (*2): ADF (Auto Document Feed) Section (P.103) (*3): Maintenace (P.184) (*4): How to Remove the Gear Block and Separation Roller (P.151) (*5): How to Remove the Operation Board, MIC Board and LCD (P.160)
  • Page 90 KX-FC255CX-S 12.3.3.1.2. Sometime There is a Transmit Problem Note: "596: Transmit level set" represents a service code. (Refer to Service Function Table (P.62).)
  • Page 91 KX-FC255CX-S 12.3.3.1.3. 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 Service Function Table (P.62).) • #06 : Refer to for Program Mode Table (P.98) Fax ring count.
  • Page 92 KX-FC255CX-S 12.3.3.1.4. The Unit can copy, but cannot Transmit / Receive REFERENCE: (*1): Test Mode (P.58) (*2): Analog Board Section (P.123)
  • Page 93 KX-FC255CX-S 12.3.3.1.5. The unit can copy, but cannot either transmit/receive long distance or interna- tional communications The following two causes can be considered for this symptom. Cause 1: The other party is executing automatic dialing, the call has been received by this unit, and the CED or DIS signal response time is too long.
  • Page 94 KX-FC255CX-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 of Service code (521) of the receiving and sending signals for the the training signal.
  • Page 95 KX-FC255CX-S Fig. c (Countermeasure by Changing the Interval Between CED and DIS) Fig. d (Countermeasure by Ignoring the 1st DIS) <TX side signal> <RX side signal> <Countermeasure> 2nd / 3rd DCS / Training & delayed CFR / FTT at TX side 2nd / 3rd EOP / EOM / MPS &...
  • Page 96 KX-FC255CX-S 12.3.3.1.7. How To Record Fax Signal by Using PC Recording FAX signal is one of the useful analysis measures to solve communication problems. The way of recording easily by using PC is shown as follows. 1. Equipment • 1 jig Parts No.

  • Page 97: Remote Programming

    KX-FC255CX-S 12.4. 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 98 KX-FC255CX-S 12.4.2. Program Mode Table Code Function Set Value Default Remote Set- ting Set date and time dd/mm/yy hh:mm 01/Jan/2006 Your logo --------- None Your FAX number --------- None Print sending report 1:ERROR / 2:ON / 3:OFF ERROR FAX ring count...
  • Page 99 KX-FC255CX-S Code Function Set Value Default Remote Set- ting Break % select 1: 61% / 2: 67% ITS auto redial time set 00~99 ITS auto redial line disconnection time set 001~999sec 065sec Remote turn-on ring number 00~99 FAX auto redial time set...

  • Page 100: Troubleshooting Details

    KX-FC255CX-S 12.5. Troubleshooting Details 12.5.1. Outline Troubleshooting is for recovering quality and reliability by determining the broken component and replacing, adjusting or clean- ing 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 101 KX-FC255CX-S 12.5.3. Troubleshooting Items Table ITEM SYMPTOM REFERENCE The document does not feed. No Document Feed P.103 (Auto Document Feeder) Document jam Document Jam P.104 Multiple feed Multiple Document Feed P.105 Skew Document Skew P.106 Recording paper feed The recording paper does not feed.
  • Page 102 KX-FC255CX-S 12.5.3.1. Simple Check List SERIAL NO. DATE FUNCTION JUDGEMENT REFERENCE FAX operation Transmission OK / NG Receiving OK / NG Copy operation OK / NG Telephone operation Handset transceiver / receiver OK / NG SP-PHONE sound OK / NG...
  • Page 103 KX-FC255CX-S 12.5.4. ADF (Auto Document Feed) Section 12.5.4.1. No Document Feed REFERENCE: (*1): How to Remove the Separation Holder and Exit Roller (P.161) (*2): Installation Position of the Lead Wires (P.162) (*3): How to Remove the Gear Block and Separation Roller (P.151) (*4): Test Mode (P.58)
  • Page 104 KX-FC255CX-S 12.5.4.2. Document Jam REFERENCE: (*1): Disassembly and Assembly Instructions (P.141) (*2): Test Mode (P.58) (*3): How to Remove the Separation Holder and Exit Roller (P.161) (*4): Sensor Section (P.129)
  • Page 105 KX-FC255CX-S 12.5.4.3. Multiple Document Feed • When using thick paper etc., sometimes the document will not be fed. (*1) REFERENCE: (*1): Installing the Recording Paper (P.54) (*2): How to Remove the Gear Block and Separation Roller (P.151) (*3): Disassembly and Assembly Instructions (P.141) (*4): How to Remove the Separation Holder and Exit Roller (P.161)
  • Page 106 KX-FC255CX-S 12.5.4.4. Document Skew REFERENCE: (*1): Maintenance Check Items/Component Locations (P.184) (*2): Disassembly and Assembly Instructions (P.141) (*3): How to Remove the Image Sensor (CIS) (P.145) (*4): Overview (P.47) (*5): We recommend making a copy of the test chart in Test Chart (P.204) and using it.
  • Page 107 KX-FC255CX-S 12.5.4.5. The Recording Paper does not Feed REFERENCE: (*1): Installing the Recording Paper (P.54) (*2): How to Remove the Pickup Roller and Antenna (P.158) (*3): Power Supply Board Section (P.125) (*4): Test Mode (P.58) (*5): How to Remove the P.C. Boards and Speaker (P.149) (*6): How to Remove the Gears, Motors and Arms of the Gear Block (P.152)
  • Page 108 KX-FC255CX-S 12.5.4.6. Paper Jam REFERENCE: (*1): Jams (P.193) (*2): Maintenance Check Items/Component Locations (P.184) (*3): Disassembly and Assembly Instructions(P.141) (*4): Test Mode (P.58) (*5): Sensor and Switches (P.24) (*6): How to Remove the Pickup Roller and Antenna (P.158)
  • Page 109 KX-FC255CX-S 12.5.4.7. Recording Paper Multiple Feed and Skew REFERENCE: (*1): How to Remove the Platen Roller and Lock Lever (P.156) (*2): How to Remove the Pickup Roller and Antenna (P.158) 12.5.4.8. The Sent Fax Data is Skewed REFERENCE: (*1): We recommend making a copy of the test chart in Test Chart (P.204) and using it.
  • Page 110 KX-FC255CX-S 12.5.4.10. Received or Copied Data is Expanded REFERENCE: (*1): Document feeder/recording paper feeder/scanner glass cleaning (P.195) (*2): Disassembly and Assembly Instructions (P.141) (*3): How to Remove the Separation Holder and Exit Roller (P.161) (*4): We recommend making a copy of the test chart in Test Chart (P.204) and using it.
  • Page 111 KX-FC255CX-S 12.5.4.11. A Blank Page is Copied REFERENCE: (*1): Test Mode (P.58) (*2): Thermal Head (P.19) (*3): How to Remove the Thermal Head (P.146) (*4): We recommend making a copy of the test chart in Test Chart (P.204) and using it.
  • Page 112 KX-FC255CX-S...
  • Page 113 KX-FC255CX-S 12.5.4.12. A Blank Page is Received REFERENCE: (*1): Test Mode (P.58) (*2): Check Sheet for Signal Route (P.123) (*3): A Blank Page is Copied (P.111) 12.5.4.13. Black or White Vertical Line REFERENCE: (*1): We recommend making a copy of the test chart in Test Chart (P.204) and using it.
  • Page 114 KX-FC255CX-S 12.5.4.14. Black or White Lateral Line on Print Out REFERENCE: (*1): Test Mode (P.58) (*2): How to Remove the Gears, Motors and Arms of the Gear Block (P.152) (*3): Installation Position of the Lead Wires (P.162) (*4): Disassembly and Assembly Instructions (P.141) (*5): We recommend making a copy of the test chart in Test Chart (P.204) and using it.
  • Page 115 KX-FC255CX-S 12.5.4.15. An Abnormal Image is Printed REFERENCE: (*1): Test Mode (P.58) (*2): Check Sheet for Signal Route (P.123) (*3): How to Remove the Thermal Head (P.146) (*4): We recommend making a copy of the test chart in Test Chart (P.204) and using it.
  • Page 116 KX-FC255CX-S 12.5.5. 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 117 KX-FC255CX-S 12.5.5.1. 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 118 KX-FC255CX-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 FLASH ROM, the ASIC cannot access DRAM normally.) The digital circuit actually operates according to the timing combinations of these signals.
  • Page 119 KX-FC255CX-S I/O and Pin No. Diagram...
  • Page 120 KX-FC255CX-S After the power is turned on, the ASIC initializes and checks each IC. The ROM, DRAM, 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 121 KX-FC255CX-S Other NG example while the power is ON and the LCD displays the following.
  • Page 122 KX-FC255CX-S 12.5.5.2. NG Example...
  • Page 123 KX-FC255CX-S 12.5.6. 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 124 KX-FC255CX-S 12.5.6.2. Defective fax NCU section 1. No Speakerphone and no monitor reception Perform a signal test in the FAX NCU section and locate a defective point (where the signal disappears) on each route between the microphone and the telephone line (sending), or between the telephone line and the speaker (receiving). Check the compo- nents at that point.
  • Page 125 KX-FC255CX-S 12.5.7. Power Supply Board Section 12.5.7.1. Key Components for Troubleshooting Check the following parts first: F101, D101-D104, C106, Q101and 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 126 KX-FC255CX-S 12.5.7.2. Troubleshooting Flow Chart...
  • Page 127 KX-FC255CX-S 12.5.7.3. 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 128 KX-FC255CX-S 12.5.8. Operation Panel Section 12.5.8.1. No Key Operation REFERENCE: (*1): Test Mode (P.58) 12.5.8.2. No LCD Indication REFERENCE: (*1): Test Mode (P.58) (*2): How to Remove the Operation Board, MIC Board and LCD (P.160)
  • Page 129 KX-FC255CX-S 12.5.9. Sensor Section Refer to Sensor and Switches (P.24) for the circuit descriptions. The Test Function makes the sensor circuit check easier. (Refer to Test Mode (P.58).) For example, as for "FILM END/COVER OPEN SENSOR", "CO" is turned ON/OFF on the display when you open or close the cover.
  • Page 130 KX-FC255CX-S 12.5.9.5. Check the Film End Sensor (SW1003)......"CHECK FILM" 12.5.9.6. Check the Motor Position Sensor (SW1004)......"CALL SERVICE 2" 12.5.9.7. Check the Hook Switch (SW1501)
  • Page 131 KX-FC255CX-S 12.5.10. CIS (Contact Image Sensor) Section Note: • (*1): Test Mode (P.58) • (*2): Digital Board (PCB1) (P.219) • Refer to Block Diagram(P.18).
  • Page 132 KX-FC255CX-S 12.5.11. Thermal Head Section Note: Refer to Thermal Head (P.19).
  • Page 133 KX-FC255CX-S 12.5.12. Cordless Section 12.5.12.1. Check Power (Cordless Handset) Cross Reference: Power Supply Circuit/Reset Circuit (P.46) 12.5.12.2. Check Battery Charge (Cordless Handset) Cross Reference: Check Power (Cordless Handset) (P.133) Charge Circuit (P.46) 12.5.12.3. Check Battery Charge (Charger Unit) Cross Reference:...
  • Page 134 KX-FC255CX-S 12.5.12.4. Check Link (Cordless Handset) Cross Reference: Power Supply Circuit/Reset Circuit (P.46) Check Point (Cordless Handset) (P.137) Note: (*1) Refer to Troubleshooting by Symptom (Cordless Handset) (P.137).
  • Page 135 KX-FC255CX-S Cross Reference: Check Point (Cordless Handset) (P.137) 12.5.12.5. Check Cordless Handset Transmission Cross Reference: Check Sheet for Signal Route (P.123) 12.5.12.6. Check Cordless Handset Reception Cross Reference: How to Check the Cordless Handset Speaker or Receiver (P.183). Check Sheet for Signal Route (P.123)
  • Page 136 KX-FC255CX-S 12.5.12.7. Bell Reception (Cordless Handset) Cross Reference: Check Link (Cordless Handset) (P.134) How to Check the Cordless Handset Speaker or Receiver (P.183)
  • Page 137 KX-FC255CX-S 12.5.13. Troubleshooting by Symptom (Cordless Handset) If your unit has below symptoms, follow the instructions in remedy column. Remedies depend on whether you have DECT tester (*1) or not. Note: (*1) A general repair is possible even if you don’t have the DECT tester because it is for confirming the levels, such as Acoustic level in detail.
  • Page 138 KX-FC255CX-S Items Check Procedure Check or Point Replace Parts (G)* Charge Detection (OFF) 1. Stop supplying 3.5V to TP20(+) and TP21(-). IC1, Q4, Q5, Check 2. Execute the command “Backloff” then “charge”. Q9, D6, L4, L5, 3. Confirm that the returned value is 00 (hex).
  • Page 139 KX-FC255CX-S Items Check Procedure Check or Point Replace Parts Timing Confirmation Follow steps 1 to 3 of (K). IC1, IC4, C66, 4.Confirm that the Timing accuracy is < ± 2.0ppm. C58, C57, C50, C53, C52, R52, C60, C61 (Q)* RSSI Level Confirmation Follow steps 1 to 3 of (K).

  • Page 140: Service Fixture & Tools

    KX-FC255CX-S 13 Service Fixture & Tools...

  • Page 141: Disassembly And Assembly Instructions

    KX-FC255CX-S 14 Disassembly and Assembly Instructions Please remove the Paper Support, Paper Tray and Ink Film before disassembling. 14.1. General Section...

  • Page 142: Disassembly Flowchart

    KX-FC255CX-S 14.2. Disassembly Flowchart 14.2.1. Upper Cabinet Section REFERENCE: A-1: How to Remove the Image Sensor (CIS) (P.145) A-2: How to Remove the Thermal Head (P.146) 14.2.2. Lower Cabinet Section REFERENCE: B-1: How to Remove the Bottom Frame (P.148) B-2: How to Remove the P.C. Boards and Speaker (P.149) B-3: How to Remove the Power Supply Board and AC Cord (P.150)
  • Page 143 KX-FC255CX-S 14.2.3. Back Cover Section REFERENCE: C-1: How to Remove the Back Cover (P.155) C-2: How to Remove the Platen Roller and Lock Lever (P.156) C-3: How to Remove the Pickup Roller and Antenna (P.158) 14.2.4. Operation Panel Section REFERENCE: D-1: How to Remove the Operation Panel (P.159)
  • Page 144 KX-FC255CX-S 14.2.5. Cordless Handset Section REFERENCE: E-1: How to Remove the Cordless Handset Board (P.168) 14.2.6. Charger Section REFERENCE: F-1: How to Remove the Charger Board (P.170)

  • Page 145: Disassembly Procedure

    KX-FC255CX-S 14.3. Disassembly Procedure 14.3.1. How to Remove the Image Sensor (CIS)
  • Page 146 KX-FC255CX-S 14.3.2. How to Remove the Thermal Head...
  • Page 147 KX-FC255CX-S...
  • Page 148 KX-FC255CX-S 14.3.3. How to Remove the Bottom Frame...
  • Page 149 KX-FC255CX-S 14.3.4. How to Remove the P.C. Boards and Speaker...
  • Page 150 KX-FC255CX-S 14.3.5. How to Remove the Power Supply Board and AC Cord...
  • Page 151 KX-FC255CX-S 14.3.6. How to Remove the Gear Block and Separation Roller...
  • Page 152 KX-FC255CX-S 14.3.7. How to Remove the Gears, Motors and Arms of the Gear Block...
  • Page 153 KX-FC255CX-S...
  • Page 154 KX-FC255CX-S 14.3.8. How to Remove the Cradle and Hook Switch Board...
  • Page 155 KX-FC255CX-S 14.3.9. How to Remove the Back Cover...
  • Page 156 KX-FC255CX-S 14.3.10. How to Remove the Platen Roller and Lock Lever...
  • Page 157 KX-FC255CX-S...
  • Page 158 KX-FC255CX-S 14.3.11. How to Remove the Pickup Roller and Antenna...
  • Page 159 KX-FC255CX-S 14.3.12. How to Remove the Operation Panel...
  • Page 160 KX-FC255CX-S 14.3.13. How to Remove the Operation Board, MIC Board and LCD...
  • Page 161 KX-FC255CX-S 14.3.14. How to Remove the Separation Holder and Exit Roller...
  • Page 162 KX-FC255CX-S 14.3.15. Installation Position of the Lead Wires 14.3.15.1. Lower Section...
  • Page 163 KX-FC255CX-S...
  • Page 164 KX-FC255CX-S...
  • Page 165 KX-FC255CX-S...
  • Page 166 KX-FC255CX-S 14.3.15.2. Operation Panel Section...
  • Page 167 KX-FC255CX-S 14.3.15.3. Back Cover Section...
  • Page 168 KX-FC255CX-S 14.3.16. How to Remove the Cordless Handset Board...
  • Page 169 KX-FC255CX-S 14.3.16.1. Fix the LCD to the Cordless Handset Board...
  • Page 170 KX-FC255CX-S 14.3.17. How to Remove the Charger Board...

  • Page 171: Measurements And Adjustments

    KX-FC255CX-S 15 Measurements and Adjustments 15.1. Cordless Base Section (Digital Board) Adjustment When you have replaced EEPROM or BBIC or X’tal, adjustment is necessary. This supplement will explain further details for adjustment. 15.1.1. Equipment Required Note: *: If you have the JIG Cable for FC245 series (TCD500 1.
  • Page 172 KX-FC255CX-S 15.1.2.2. Batch Files Settings Note: • “****” varies depending on the country. • See the Command (P.172) for frequently used commands. 15.1.2.3. Command command function and how to use readid read ID number of Base unit writeid ** ** ** ** **...
  • Page 173 KX-FC255CX-S 15.1.3.2. In Case of BBIC Replacement When you replace BBIC, you need to adjust Frequency and Voltage. --> Refer to Frequency and Voltage Adjustment (P.173). 15.1.3.3. In Case of X’tal (X5) Replacement When you replace X’tal, you need to adjust Frequency. --> Refer to Frequency Adjustment (P.173).
  • Page 174 KX-FC255CX-S 15.1.4.3. Voltage Adjustment Note: • “****” varies depending on the country. • When you write new value to the EEPROM, it is necessary to turn the power off and then power on again. After power on again, Board works with new value you wrote.

  • Page 175: Adjustment Standard (Base Unit)

    KX-FC255CX-S 15.2. Adjustment Standard (Base Unit) 15.2.1. Component View FC: Frequency Counter MM: Multi Meter TX, RX, GND RFCLK C283 24Va C341 R356 R359 C340 C343 C662 +3.0Va C339 R353 1.8V_A SPIDO R354 R351 C338 C353 C337 J116 R350 J115...
  • Page 176 KX-FC255CX-S 15.2.2. Bottom view R367 R368 R301 R58 R70 C366 C278 C363 R303 R369 R337 C276 R336 C368 C362 C401 R311 C292 R631 R361 R632 R273 PFUP1584Z R233 DECT-CH ADJUST C113 C117 C402 R242 C123 C227 R630 R626 IC29 +3.0V...

  • Page 177: Adjustment Standard (Charger Unit)

    KX-FC255CX-S 15.3. Adjustment Standard (Charger Unit) When connecting the Simulator Equipments for checking, please refer to below. 15.3.1. Flow Solder Side View Digital DC POWER Volt 6.5V Meter 12Ω/2W BLACK for_ PQLV30045ZA PQUP11413Z Note: (A) is referred to Check Point (Charge Unit) (P.139)

  • Page 178: The Setting Method Of Jig (Cordless Handset)

    KX-FC255CX-S 15.4. The Setting Method of JIG (Cordless Handset) 15.4.1. Preparation 15.4.1.1. Equipment Required • DECT tester: Rohde & Schwarz, CMD 60 is recommended. • Frequency counter: it must be precise to be able to measure 1Hz (precision; ±4ppm). Hewlett Packard, 53131A is recommended.
  • Page 179 KX-FC255CX-S 15.4.2.2. Batch Files Setting Note: • “****” varies depending on the country. • See the Commands (P.179) for frequently used commands. 15.4.2.2.1. Commands Command name Function Example rdeeprom Read the data of FLASH Type “rdeeprom 00 00 FF”, and the data from address “00 00”...

  • Page 180: Adjustment Standard (Cordless Handset)

    KX-FC255CX-S 15.5. Adjustment Standard (Cordless Handset) When connecting the Simulator Equipments for checking, please refer to below. 15.5.1. Component View CLK_G REV+ REV_TEST1 REV_TEST2 R106 REV- C115 R107 SP_TEST2 SP_TEST1 C102 C101 C110 C100 VDD3 POWER VDD4 VDD1 R109 VDD2...

  • Page 181: Things To Do After Replacing Ic

    KX-FC255CX-S 15.6. Things to Do after Replacing IC Cautions: Since this page is common to each country, it may not apply to some models in your country. The contents below are the mini- mum adjustments required for operation. 15.6.1. Base Unit Before doing the following adjustment, be sure to do PC Setting (P.171) in Cordless Base Section (Digital Board) Adjust-...

  • Page 182: Rf Specification

    KX-FC255CX-S 15.7. RF Specification 15.7.1. Base Unit Item Value TX Power 20 dBm ~ 25 dBm Modulation -350 ~ -400/+320 ~ +370 kHz/div Frequency Offset -45 kHz ~ +45 kHz Frequency Drift < ± 30 kHz / ms RX Sensitivity <...

  • Page 183: How To Check The Cordless Handset Speaker Or Receiver

    KX-FC255CX-S 15.8. How to Check the Cordless Handset Speaker or Receiver 1. Prepare the digital voltmeter, and set the selector knob to ohm meter. 2. Put the probes at the speaker terminals as shown below. 15.9. Frequency Table (MHz) BASE UNIT...

  • Page 184: Maintenance

    KX-FC255CX-S 16 Maintenace 16.1. Maintenance Items and Component Locations 16.1.1. Outline Maintenance and repairs are reformed using the following steps. 1. Periodic maintenance 4. Determine causes Inspect the equipment periodically and if necessary, clean Determine the causes of the equipment problem by trouble- any contaminated parts.
  • Page 185 KX-FC255CX-S 16.1.2.1. 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 thor- Refer to Document feeder/recording paper oughly. feeder/scanner glass cleaning (P.195).

  • Page 186: Gear Section

    KX-FC255CX-S 16.2. 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 187 KX-FC255CX-S 16.2.2. Mode Operation Once a mode is selected, the Drive Motor Gear rotates counterclockwise (CCW) and then the controlling positions of Swing Gears A, B and C, D, E determine which gears convey their drive power in each mode. See “Sensor Location” in Sensor and Switches (P.24).
  • Page 188 KX-FC255CX-S C. Assist mode (See Fig. C.): The Swing Gear D engages with the next gear to drive Pickup Roller. The Swing Gear B engages with the next gear to drive Platen Roller gear and Ribbon Drive Gear. The Swing Gear C engages with the next gear to drive Paper Exit Roller Gear.
  • Page 189 KX-FC255CX-S E. Copy mode (See Fig. E.): “Copy mode” = “Transmit mode“ + “Receive mode“ The Swing Gear A engages with the next gear to drive Document Separation Roller and Document Exit Roller. The Swing Gear B engages with the next gear to drive Platen Roller gear and Ribbon Drive Gear.
  • Page 190 KX-FC255CX-S 16.2.3. Mechanical Movements in the Main Operations (transmitting documents, receiving faxes and copying) 16.2.3.1. Idle Status Note: • See “Sensor Locations” in Sensor and Switches (P.24). • CW..clockwise • CCW..counterclockwise...
  • Page 191 KX-FC255CX-S 16.2.3.2. Transmitting Documents 16.2.3.3. Receiving Fax REFERENCE: Sensor Section (P.129). Note: See “Sensor Locations” in Sensor and Switches (P.24).
  • Page 192 KX-FC255CX-S 16.2.3.4. Copying Note: See “Sensor Locations” in Sensor and Switches (P.24). REFERENCE: Sensor Section (P.129)

  • Page 193: Jams

    KX-FC255CX-S 16.3. Jams 3. Turn the gear of the blue core ( ) in the direction of the arrow until the ink film is tight ( ) and at least one layer 16.3.1. Recording Paper Jams of ink film is wrapped around the blue core ( 16.3.1.1.
  • Page 194 KX-FC255CX-S 16.3.2. Document Jams 4. Close the back cover securely by pushing down on the dotted area at both ends ( ), then close the front cover 1. Open the front cover. Remove the jammed document securely ( carefully ( 5.

  • Page 195: Cleaning

    KX-FC255CX-S 16.4. Cleaning Caution: • Do not use paper products, such as paper towels or tissues. 16.4.1. Document feeder/recording paper feeder/scanner glass cleaning Clean the document feeder/recording paper feeder/scanner glass when: — Documents or recording paper frequently misfeed. — Smudges or black/white lines appear on the original docu- ment when sending or copying.
  • Page 196 KX-FC255CX-S 16.4.2. Thermal Head Cleaning Caution: • To prevent a malfunction due to static electricity, do If smudges or black/white lines appear on a copied/received not use a dry cloth and do not touch the thermal document, check whether there is dust on the thermal head.

  • Page 197: Miscellaneous

    KX-FC255CX-S 17 Miscellaneous 17.1. Terminal Guide of the ICs, Transistors and Diodes 17.1.1. Digital Board 17.1.2. Analog Board...
  • Page 198 KX-FC255CX-S 17.1.3. Operation Board / Microphone Board 17.1.4. Power Supply Board 17.1.5. Interface Board...
  • Page 199 KX-FC255CX-S 17.1.6. Cordless Handset Board...

  • Page 200: How To Replace The Flat Package Ic

    KX-FC255CX-S 17.2. 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 201 KX-FC255CX-S 17.2.3. 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. 2. Apply flux to all pins of the FLAT PACKAGE IC.

  • Page 202: Test Chart

    KX-FC255CX-S 17.3. Test Chart 17.3.1. ITU-T No.1 Test Chart...
  • Page 203 KX-FC255CX-S 17.3.2. ITU-T No.2 Test Chart...
  • Page 204 KX-FC255CX-S 17.3.3. Test Chart...
  • Page 205 KX-FC255CX-S MEMO:...

  • Page 206: Schematic Diagram

    KX-FC255CX-S 18 Schematic Diagram 18.1. Digital Board (PCB1) TO PRINTER...
  • Page 207 KX-FC255CX-S TO ANALOG TO HOOK PCB...
  • Page 208 KX-FC255CX-S...
  • Page 209 KX-FC255CX-S...

  • Page 210: Analog Board (Pcb2)

    KX-FC255CX-S 18.2. Analog Board (PCB2) L112 IC103 C144 IC103 C146 C140 R147 R146 C141 C143 R145 R144 C145 L113 C142 L114 C151 R152 R141 T101 C154 C121 R138 C130 C147 R150 R151 C149 C150 K0.1u R148 R149 C136 50V 4.7u...
  • Page 211 R104 D104 D103 47K 1/2W 5.6V 5.6V Q102 (10) (11) (12) (13) R175 R174 R173 R172 R171 R168 R167 (14) R184 R183 R182 R181 R180 R169 R170 (15) J110 J111 J113 J116 J114 J117 J115 J118 KX-FC255CX-S : Analog Board...

  • Page 212: Operation Board (Pcb3) / Mic Board (Pcb9)

    KX-FC255CX-S 18.3. Operation Board (PCB3) / MIC Board (PCB9)

  • Page 213: Power Supply Board (Pcb4)

    KX-FC255CX-S 18.4. Power Supply Board (PCB4)

  • Page 214: Interface Board (Pcb5)

    KX-FC255CX-S 18.5. Interface Board (PCB5)

  • Page 215: Sensor Board (Pcb6)

    KX-FC255CX-S : Sensor Board 18.7. Film End Sensor Board (PCB7) 18.8. Motor Position Sensor Board (PCB8) FLMDET SW1004 FILM Sensor SW1003 KX-FC255CX-S : Motor Position Sensor Board KX-FC255CX-S : Film End Sensor Board 18.9. Hook Switch Board (PCB10) L1505 CN1502 CN1501 L1501 JJ1501...

  • Page 216: Cordless Handset Board (Pcb100)

    KX-FC255CX-S 18.10. Cordless Handset Board (PCB100) 115kHz Back light OFF: 4.2V (Talk Mode) Back light ON: 3.5V Charge Current VDD3 BATTERY VDD4 2.5V 1.8V +4.2V VDD2 VDD1 5.6n +2.5V +1.8V 5.6k 5.6k TP20 (When on charge) TP21 +1.8V K0.1u +2.5V POWER 3.3k...
  • Page 217 RX DATA 1.5V DC supply to Mic 2.2k TP22 TX-AF K0.1u 3.3k TP23 HEADSET_DET 100k 330p +2.5V Z10u D10p EEPROM REV_TEST1 680k RX-AF (Handset) (10) REV_TEST2 Sp-phone RX Beep SP_TEST1 (11) SP_TEST2 (12) NC: No Components KX-FC255CX-S : Cordless Handset Board...

  • Page 218: Charger Board (Pcb200)

    KX-FC255CX-S 18.11. Charger Board (PCB200) KX-FC255CX-S : Charger Board...

  • Page 219: Printed Circuit Board

    +12VA C668 C168 RBA6 R150 C172 C169 SYSRST R148 2.5VD 24MHz IC10 C124 C158 C142 R132 C152 C159 EYESYNC R118 C160 R109 C146 R110 AIN2 3.3VA R124 R112 C151 Q27 Q11 R111 C154 AIN1 KX-FC255CX-S : Digital Board (Bottom View)
  • Page 220 C174 C660 +4.0V C412 C661 R149 C170 C681 RA13 R209 R188 R114 3.3VDa R204 C330 R628 R203 C678 TEST C206 EYECLK IC17 AMON UCTS 3.3VM URTS R206 2.5VDa R137 AUTO-CH R210 R136 R187 PFUP1584Z KX-FC255CX-S : Digital Board (Component View)

  • Page 221: Analog Board (Pcb2)

    L112 C191 R212 C143 R191 R196 R209 IC105 R199 R202 R213 R207 R205 R208 R193 IC106 R189 R200 R201 R210 C185 C183 R197 R204 R195 C192 C194 R198 C189 C188 C187 R214 R206 R192 KX-FC255CX-S : Analog Board (Bottom View)
  • Page 222 C107 C102 PC104 FLT101 C195 R108 J124 C181 C103 PC102 T101 T102 C180 R104 D111 PFUP1585Z D112 JJ508 JJ1001 JJ514 JJ510 JJ507 PCB-CH R170 D118 C169 JJ1017 JJ518 R168 JJ515 JJ517 JJ516 JJ1012 JJ1016 KX-FC255CX-S : Analog Board (Component View)

  • Page 223: Operation Board (Pcb3) / Mic Board (Pcb9)

    KX-FC255CX-S 19.3. Operation Board (PCB3) / MIC Board (PCB9) PFUP1582Y PFUP1582Z MIC- LED302 MIC+ JJ333 JJ321 JJ320 SW314 SW313 JJ319 JJ318 JJ317 JJ310 JJ304 JJ315 JJ306 JJ314 JJ305 JJ303 JJ302 JJ301...

  • Page 224: Power Supply Board (Pcb4)

    KX-FC255CX-S 19.4. Power Supply Board (PCB4) C102 L103 JP104 D107 R110 JP103 R105 C109 C111 JP105 JP102 L102 D105 L201 D201 C211 JP206 JP205 JP204 C201 R230 C217 JP207 CN202...

  • Page 225: Interface Board (Pcb5)

    KX-FC255CX-S : Interface Board 19.6. Sensor Board (PCB6) 19.7. Film End Sensor Board (PCB7) PFUP1579Z SW1003 BLACK WHITE KX-FC255CX-S : Film End Sensor Board 19.8. Motor Position Sensor Board (PCB8) PFUP1589Z KX-FC255CX-S : Sensor Board KX-FC255CX-S : Motor position Board...

  • Page 226: Hook Switch Board (Pcb10)

    KX-FC255CX-S 19.9. Hook Switch Board (PCB10) (Component View) PFUP1586Z CN1502 SW1501 L1505 CN1501 (Bottom View) KX-FC255CX-S : Hook Switch Board...

  • Page 227: Cordless Handset Board (Pcb100)

    KX-FC255CX-S 19.10. Cordless Handset Board (PCB100) 19.10.1. Component View CLK CLK_G REV_TEST1 REV_TEST2 R106 C115 R107 SP_TEST2 SP_TEST1 C102 C101 C110 C100 VDD3 POWER VDD4 VDD1 R109 VDD2 JTAG C113 BATT+ BATT- TP22 TP23 TP20 TP21 CHARGE+ CHARGE-...
  • Page 228 KX-FC255CX-S 19.10.2. Flow Solder Side View LED10 LED- LED1 R108 C114 C105 C103 C107 R105...

  • Page 229: Charger Board (Pcb200)

    19.11.2. Flow Solder Side View BLACK for_ PQLV30045ZA PQUP11413Z KX-FC255CX-S : Charger Board (Flow Solder Side View) 20 Appendix Information of Schematic Diagram 20.1. For Schematic Diagram Note: 1. DC voltage measurements are taken with an oscilloscope or a tester with a ground.

  • Page 230: Cpu Data

    KX-FC255CX-S 20.2. CPU Data 20.2.1. IC4: BBIC (Digital Board) PIN NAME DESCRIPTION PIN STATEMENT ASSIGNMENT Pull up or Reset Connection down state NAME P3[7] General purpose O_HiZ BELL/DCN external 33k pullup to I/O port 3.0V P3[6] General purpose O_HiZ URTS...
  • Page 231 KX-FC255CX-S PIN NAME DESCRIPTION PIN STATEMENT ASSIGNMENT Pull up or Reset Connection down state NAME P0[1] General purpose input Data to pull down voltage convert with I/O port UART R/R ,, 3.3V->3.0V P0[0] General purpose UART DATA selectable I_PU connect to ASIC...
  • Page 232 KX-FC255CX-S PIN NO. SIGNAL RESET STATE FMEMCLK/IOP24 INPUT BBRST FMEMDI/IOP25 INPUT CISON [MODEM GPIO]: 100 PIN NO. SIGNAL RESET STATE GPI2 GPI2 INPUT GPI3 GPI3 INPUT GPI4 GPI4 INPUT GPI5 GPI5 INPUT GPI6 GPI6 INPUT CHK_IN2 GPI7 GPI7 INPUT CHK_IN3...
  • Page 233 KX-FC255CX-S 20.2.3. IC1: BBIC (Cordless Handset Board) Pin No. Description Connection at Normal mode at Reset mode INT1n/P1[1] ROW1 I-PU VDDIO VDDIO LED1/PWM0/P2[0] LCD_BACKLIGHT I-PU LED2/PWM1/P2[1] LCD_CSB I-PU LED3 LED_BIAS/P3[6]/PD6 RF_RESET I-PD SDA1/P2[5] RINGER_LED SCL1/P2[4] INT5n/VDDE/P1[5] LCD_CD/LCD_RS INT2n/P1[2] ROW2 I-PU...
  • Page 234 KX-FC255CX-S Pin No. Description Connection at Normal mode at Reset mode AVD2 AVD2 LSRn/REF LSRn LSRp/REF LSRp MICn MICn VREFm VREFm VBUF VBUF AGND AGND MICp MICp VREFp VREFp P3[0] COL0 I-PD P1[4]/INT4n KEY_LED P1[3]/INT3n ROW3 P2[2]/CLK100 LCD_RESET I-PD AVS_Sence...

  • Page 235: Exploded View And Replacement Parts List

    KX-FC255CX-S 21 Exploded View and Replacement Parts List 21.1. Cabinet, Mechanical and Electrical Parts Location 21.1.1. General Section...
  • Page 236 KX-FC255CX-S 21.1.2. Operation Panel Section...
  • Page 237 KX-FC255CX-S 21.1.3. Upper Cabinet Section...
  • Page 238 KX-FC255CX-S 21.1.4. Back Cover Section...
  • Page 239 KX-FC255CX-S...
  • Page 240 KX-FC255CX-S 21.1.5. Lower Cabinet Section...
  • Page 241 KX-FC255CX-S 21.1.6. Gear Block Section...
  • Page 242 KX-FC255CX-S...
  • Page 243 (*1) This cable is fixed by soldering. Refer to Fix the LCD to the Cordless Handset Board (P.169). (*2) The rechargeable Ni-MH battery (HHR-4EPT, Capacity: up to 750 mAh) is available through sales route of Panasonic. (*3) Attach the spacer (No. 323) to the exact location described above.
  • Page 244 KX-FC255CX-S 21.1.8. Charger Section...
  • Page 245 KX-FC255CX-S 21.1.9. Screws...
  • Page 246 KX-FC255CX-S 21.1.10. Accessories and Packing Materials Note: (*1) for Service Model No. for A13 (BELT CLIP) through sales route of Panasonic is KX-TCA718EX.

  • Page 247: Replacement Parts List

    KX-FC255CX-S 21.2. Replacement Parts List 1. RTL (Retention Time Limited) Ref. Part No. Part Name & Description Remarks Note: PFHR1573Z COVER, SEPARATION HOLDER ABS-HB The marking (RTL) indicates that the Retention Time is PFUS1712Z COIL SPRING limited for this item.
  • Page 248 KX-FC255CX-S Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks PFKV1142Z1 COVER, ROLLER PS-HB PFDR1057Z ROLLER, SUPPORT 21.2.1.6. Cordless Handset Section PFUS1706Z BAR SPRING PFUS1750Z TORSION SPRING PFUS1792Z COIL SPRING PS-HB Ref. Part No.
  • Page 249 KX-FC255CX-S Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks PQKE10456Z1 HANGER, BELT CLIP PC+ABS- K1KA10A00441 CONNECTOR, 10 PIN (for Service) K1KA11A00170 CONNECTOR, 11 PIN CN14 K1KA07A00257 CONNECTOR, 7 PIN PFZE1574Z-M GIFT BOX...
  • Page 250 KX-FC255CX-S Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks R108 ERJ2GEJ102 R351 ERJ2GEJ102 R109 ERJ2GEJ100 R353 ERJ2GEJ472X 4.7k R110 ERJ2GEJ101 R354 ERJ2GEJ102 R111 ERJ2GEJ101 R356 ERJ2GEJ821 R112 ERJ2GEJ100 R357 ERJ2GEJ560X R113 ERJ2GEJ472X 4.7k...
  • Page 251 KX-FC255CX-S Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks ECUE1H100DCQ C227 ECJ0EC1H220J ECJ0EF1C104Z C229 ECJ0EF1C104Z ECJ0EB1H102K 0.001 C247 ECJ0EB1A104K ECJ0EF1C104Z C248 ECJ0EB1H331K 330P ECUV1A105ZFV C273 ECJ0EB1H102K 0.001 ECUV1A105ZFV C274 ECJ0EB1A104K ECJ0EB1H102K 0.001...
  • Page 252 KX-FC255CX-S Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks C613 F2G1V3300012 C614 ECUV1H104ZFV J105 ERJ6GEY0R00 C615 ECJ1VB1C105K J107 ERJ3GEY0R00 C660 ECJ0EF1C104Z J119 ERJ3GEY0R00 C661 ECJ0EF1C104Z J120 ERJ3GEY0R00 C679 ECJ0EB1H102K 0.001 C680 ECJ0EB1H102K 0.001...
  • Page 253 KX-FC255CX-S Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks C305 ECUV1H331JCV 330P (COILS) C306 ECUV1H331JCV 330P PQLQR2M10NJ COIL C307 ECUV1C104ZFV PQLQR2M10NJ COIL C308 ECUV1C104ZFV PQLQR2M10NJ COIL C311 ECUV1C104ZFV C330 ECUV1H103KBV 0.01 (SWITCHES)
  • Page 254 KX-FC255CX-S Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks R101 ERJ8GEYJ105 CN404 K1KA11A00158 CONNECTOR, 11 PIN R102 ERJ8GEYJ105 CN405 K1KA05AA0193 CONNECTOR, 5 PIN R103 ERJ8GEYJ105 CN407 K1KA03A00495 CONNECTOR, 3 PIN R104 ERJ3GEYJ473...
  • Page 255 KX-FC255CX-S 21.2.11. Hook Swicth Board Parts Ref. Part No. Part Name & Description Remarks (CONNECTOR AND JACK) K1MY20BA0112 CONNECTOR Ref. Part No. Part Name & Description Remarks K2HD103D0001 JACK PCB10 PFLP1799MZ HOOK SWITCH BOARD ASS'Y (RTL) (LCR FILTERS) J0JCC0000286 LCR FILTER...
  • Page 256 KX-FC255CX-S Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks F1G1A2240008 0.22 (RESISTORS) PQCUV1A225KB ERDS1VJ100 ECUV1C104KBV ERDS1TJ120 ECJ0EB0J105K ERDS1VJ100 ECUV1A105KBV ERDS1TJ120 ECJ0EB1H102K 0.001 ECJ0EB1A104K 21.2.14. Service Fixture and Tools ECJ0EB1A104K Note: ECJ0EB1A104K • (*4) See Cordless Base Section (Digital Board) Adjust-...

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