ORDER NO. KM79911336C3 PARSONAL FACSIMILE KX-FT21RS (Russia) © 1999 Kyushu Matsushita Electric Co., Ltd. All rights reserved. Unauthorized copying and distribution is a violation of law.
KX-FT21RS CONTENTS Page Page 3 6.10. EXT. TEL 133 1.1. SAFETY PRECAUTIONS 3 6.11. OPERATION PANEL 135 1.2. INSULATION RESISTANCE TEST 3 6.12. POWER SUPPLY BOARD SECTION 137 1.3. FOR SERVICE TECHNICIANS 3 7 FOR THE SCHEMATIC DIAGRAMS 140 1.4. BATTERY CAUTION 3 8 PRINTED CIRCUIT BOARD 141 1.5. AC CAUTION 4 1.6. PERSONAL SAFETY PRECAUTIONS 5 1.7. FEATURES 6 1.8. SPECIFICATIONS 7 1.9. OPTIONAL ACCESSORIES 7 1.10. CCITT No. 1 TEST CHART 8 1 INTRODUCTION 1.11.
KX-FT21RS 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. 4. After servicing, be sure to restore the lead dress, insulation barriers, insulation papers, shields, etc. 5.
KX-FT21RS 1.5. AC CAUTION For safety, before closing the lower cabinet, please make sure of the following precautions.
KX-FT21RS 1.6. 1.6.1. PERSONAL SAFETY PRECAUTIONS 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. A gear rotates the two rollers. Be careful not to touch them with your hands, especially when the unit is operating. 1.6.2.
KX-FT21RS 1.7.
KX-FT21RS 1.8. SPECIFICATIONS Applicable Lines: Document Size: Public Switched Telephone Network Max. 216 mm (8 1/2”) in width Effective Scanning Width: Recording Paper Size: Effective Printing Width: Transmission Time*: Max. 600 mm (23 5/8”) in length 208mm (8 3/16”) 216 mm max. 30 m (8 1/2”×98”) roll 208 mm (8 3/16”) Approx. 15 s/page (Original mode)** Scanning Density: Approx. 30 s/page (G3 Normal mode) Horizontal: 8 pels/mm (203 pels/inch) Vertical: 3.85 lines/mm (98 lines/inch)—STANDARD mode 7.
KX-FT21RS 1.10. CCITT No.
KX-FT21RS 1.11. LOCATION OF CONTROLS 1.11.1. OVERVIEW 1.11.2.
KX-FT21RS 1.12. CONNECTIONS NOTE When you operate this products, the power outlet should be near the product and easily accessible.
KX-FT21RS 1.13. INSTALLATION 1.13.1. INSTALLING THE RECORDING PAPER 1 Open the cover by pressing the cover open button and install the recording paper roll. correct incorrect Cover open button If the paper is secured with glue or tape, cut approximately 15 cm (6 inches) from the beginning. 2 Pull the leading edge of the paper approximately 10 cm (4 inches) out of the unit. Make sure that there is no slack in the paper roll. 3 Close the cover securely by pushing down on both ends.
KX-FT21RS 1.13.3. SETTING YOUR LOGO The logo can be your company, division or name. 1 Press MENU . Display: SYSTEM SET UP 1 / 2 2 Press # , then 0 3 Press 4 Enter your logo, up to 30 characters, by using the dial keypad. See the next page for details. 2 . YOUR LOGO START/COPY/SET . LOGO= MENU STOP (Delete) START/COPY/SET Example: Bill 1. Press 2 twice. LOGO=B Cursor 2. Press 4 six times. LOGO=Bi 3. Press 5 six times. LOGO=Bil 4.
KX-FT21RS 1.13.4. To select characters with the dial keypad Pressing the dial keys will select a character as shown below. 1.13.5. Documents you can send Note: Remove clips, staples or other similar fastening objects. Check that ink, paste or correction fluid has dried. Do not send the following types of documents. Use copies for fax transmission.
KX-FT21RS 1.14. MAINTENANCE ITEMS AND COMPONENT LOCATIONS 1.14.1. 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. If the equipment can be still used, perform copying, self testing or communication testing. 3.
KX-FT21RS 1.14.2.1. MAINTENANCE LIST 1.14.2.2.
KX-FT21RS 1.14.3. MAINTENANCE 1.14.3.1. CLEANING THE DOCUMENT FEEDER UNIT If misfeeding occurs frequently or if dirty patterns or black bands appear on a copied or transmitted document, clean the document feeder. 1 Disconnect the power cord and the telephone line cord. 2 Open the cover by pressing the cover open button. 3 Clean the document feeder rollers, sub roller and rubber flap with a cloth moistened with isopropyl rubbing alcohol, and let all parts dry thoroughly.
KX-FT21RS 1.14.3.2. CLEANING THE THERMAL HEAD If dirty patterns or black bands appear on a copied or received document, clean the thermal head. 1 Disconnect the power cord and the telephone line cord. 2 3 Open the cover by pressing the cover open button. 4 Close the cover securely by pushing down on both ends. 5 Connect the power cord and the telephone line cord. Thermal head Clean the thermal head with a cloth moistened with isopropyl rubbing alcohol, and let it dry thoroughly.
KX-FT21RS 2 TROUBLESHOOTING GUIDE 2.1. 2.1.1. TROUBLESHOOTING SUMMARY 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. 2.
KX-FT21RS 2.2. USER RECOVERABLE ERRORS If the unit detects a problem, the following messages will appear on the display. Note: The explanations given in the [ ] are for servicemen only.
KX-FT21RS 2.2.1. Document Jam If the unit does not release the document during feeding, remove the jammed document as follows. 1 Open the cover by pressing the cover open 2 3 Remove the jammed document carefully. button. Close the cover securely by pushing down on both ends. Note: • Do not pull out the jammed paper forcibly. before opening the cover.
KX-FT21RS 2.3. 2.3.1. TROUBLESHOOTING DETAILS OUTLINE Troubleshooting guide provides a logical path of deduction to assist in locating a fault and suggests methods of restoring the unit to full working condition. Use the reported symptoms of the fault to determine the best troubleshooting method. Even difficult faults can be tracked to a specific block or area, for example, the "Digital Board" or "Image Sensor".
KX-FT21RS 2.3.3.
KX-FT21RS 2.3.4.
KX-FT21RS 2.3.4.1. ADF (Auto Document Feed) Section 1.
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KX-FT21RS 3. Multiple feed When using thick paper etc., If the document will not feed. Refer to 3.1. ADJUSTING THE FEED PRESSURE.
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KX-FT21RS 6. Black or white vertical lines appear 7.
KX-FT21RS 8. Expander print (When printing) 9.
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KX-FT21RS 2.3.4.2. Communication Section Find the problem in the table shown below, and refer to the corresponding troubleshooting procedure in 2.3.4.2.1. Defective facsimile section.
KX-FT21RS 2.3.4.2.1. Defective facsimile section 1.
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KX-FT21RS 3. Reception problem Confirm the following before starting troubleshooting. Is the recording paper installed properly? There is the receiving problem when sometimes the below errors may be occurred. OUT OF PAPER CHECK COVER Unit OVERHEATED (If it doesn´t return automatically, COVER OPEN, etc., reset the unit.) CHECK DOCUMENT PAPER JAM Please refer to 2.2. User Recoverable Errors for the above items. Also, when a hardware deformity occurs, please check each sensor.
KX-FT21RS 4.
KX-FT21RS 5. Unit can copy, but cannot transmit/receive long distance or international communications The following 2 causes can be considered for this. Cause 1: The other party is executing automatic dialling, the call has been received by this unit, and the CED or DIS signal response time is too long. (In most cases, this unit detects the CNG signal and can respond to the CED or DIS.
KX-FT21RS (Causes and Countermeasures) (Cause A) When a training signal is transmitted from FAX1 during the communication procedure at the time of transmission from FAX1 toFAX2, there is a delay until the echo canceler operates. S1 is closed so that a part of the head of the training signal may dropout. Normal reception by FAX2 may not be possible, and transmission may not be started. (Countermeasure A) When the international line mode is ON in the service mode (code No.
KX-FT21RS 6. The unit can copy, but the transmission and reception image is incorrect (Long distance or international communication operation) This depends widely on the transmission and reception capability of the other FAX unit and the line conditions. The countermeasures for this unit are shown below. Transmission Operation: Set the transmitting speed to 4800BPS (service mode: code No. 717) or select the overseas mode.
KX-FT21RS 7.
KX-FT21RS TX=TRANSMISSION RX=RECEPTION Most fax communication problems can be resolved by the following steps. a. Change the transmit level. (Service code: 596, refer to 2.4.4. Service Function Table.) b. Change the TX speed/RX speed. (Service code: 717/718, refer to 2.4.4. Service Function Table.) If the problem remains, see the next page.
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KX-FT21RS 2.3.4.2.2. 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). Therefore, travel to the customer´s location is not required. However, it is not possible to change all the parameters remotely (2. Program mode table).
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KX-FT21RS Code Function 994 Transmit journal report 996 Journal 3 999 Transmit service list Set Value 1: START 1: START 1: START Default ------------------------- Remote setting OK OK OK OK : Can set the value by the remote programming feature or print a list. NG : Cannot set the value. Note: Note: Refer to 2.4.4. SERVICE FUNCTION TABLE for descriptions of the individual codes. For example, the "004 Transmission report mode" set value "1:ERROR/2:ON/3:OFF" number corresponds to the number dialled.
KX-FT21RS 2.3.4.3. Digital Board Section One of most difficult problems to deal with is when the system will not boot up. The symptom: No response when the power is turned on. (No LCD display, keys are not accepted.) Then first thing to do is check the power source, If there is no problem with the power supply unit, then there is a problem with the digital unit (main board). As there are many potential causes in this case (ASIC, etc.), it may be difficult to specify what you should check first.
2.3.4.3.1. ROM (IC2) SRAM (IC3) ANALOG FRONT END (IC5) ANALOG SW (IC6) A0-17 A0-17 TO ANALOG D0-7 D0-7 RD RD WR TO CIS CIS-CTL CLK, SIG 24V XWDERR TO THERMAL HEAD D0-7 A0-17 ASIC IC1 TH ON HEAD-CTL Q13 H/S RX VOL SP KSTART,KLATCH,KSCLK,KTXD,KRXD,KIN0,KIN1,KIN2,KIN3 RS,E 32.768KHz 24MHz (IC7) 5V RESET BACK UP TO ANALOG TO OPE PANEL STBI-2,THLAT THCLK,THDAT (IC4) RX RXIN H/S TX XRESETI 55 +5V LED ON RD IC7 WR +24V TX TXOUT 20.
KX-FT21RS The signal lines that must be normal for the system to boot up are listed here [List 1]. For signal lines other than these, even if they malfunction they do not directly affect booting up the system.
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KX-FT21RS For these reasons and the software sequence to boot up the unit, if you use an oscilloscope to judge whether a signal is OK or NG, you must check in the same order as in [List 1]. (If the ASIC (CPU) failed to access the ROM, the ASIC cannot access the SRAM or DRAM normally.) The digital circuit actually operates according to the timing combinations of these signals. So, if the timing of these signals is even slightly off, the circuit will not operate normally.
KX-FT21RS After the power is turned on, the ASIC (CPU) initializes and checks each IC. The ROM, SRAM, and Modem are checked. If initialization fails for the ICs, the system will not boot up.
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KX-FT21RS 2.3.4.3.2. Check the Status of the Digital Board Put the unit in the test mode and check the voltage at lands A, B, C and D.
KX-FT21RS 2.3.4.4. Analog Board Section The analog parts check is actually different than the digital parts check. The signal route is determined by the purpose of the check. For example, the handset TX route begins from the handset microphone and is output in the telephone line. In this route, it is mainly an analog signal. Tracing the signal can be done easily using an oscilloscope. Each route is shown on the Check Sheet here.
KX-FT21RS 1.
KX-FT21RS 2.3.4.5. Power Supply Board Section 1. Key components for troubleshooting Check the following parts first: F101, D101-D104, C106, Q101, PC101 and IC101. This comes from our experience with experimental tests. For example: power supply and lightning surge voltage test, with standing voltage test, intentional short circuit test, etc.
KX-FT21RS 2.
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KX-FT21RS 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-circuited, F101 will melt (open). In this case, replace all of the parts (D101, D102, D103, D104, F101). (Q101) The worst case of Q101 is a short-circuit between the Drain and Gate because damage expands to the peripheral circuit of Q101. This is due to a very high voltage through the Gate circuit which is composed of R107, R109, D106 and IC101.
KX-FT21RS 2.3.4.6. Operation Board Section 1. No key operation 2.
KX-FT21RS 2.3.4.7. Sensor Section Refer to 6.5. SENSORS AND SWITCHES for the circuit descriptions. 1. Check the document sensor (PS1)................."REMOVE DOCUMENT" 2. Check the read position (PS2).................
KX-FT21RS 2.3.4.8. Read Section Refer to 6.4.4. SCANNING BLOCK.
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KX-FT21RS 2.3.4.9. Thermal Head Section Refer to 6.4.3. THERMAL HEAD.
KX-FT21RS 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. Programming can be done in both the on-hook and off-hook conditions. This facilitates communication between the user and the service while programming the machine. 2.4.1. OPERATION There are 2 basic categories of programming functions, the User Mode and the Service Mode.
KX-FT21RS 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.
KX-FT21RS 2.4.4.
KX-FT21RS Code Function 718 Receive speed select 719 Set Value 1:9600BPS 2:7200BPS 3:4800BPS 4:2400BPS 1:ON 2:OFF Effective Range 1~4 Default 9600 BPS Remarks Adjusts the speed to start training during FAX reception. 1, 2 ON 1:ON 2:OFF 1, 2 ON 1, 2 ON Sets the ringer switch off when a call is received in the TEL/FAX mode. Selects the tone detection for pauses in dialing. Selects the tone detection mode after redialing. Selects the CNG detection time of friendly reception.
KX-FT21RS 2.4.6.
KX-FT21RS 2.5.
KX-FT21RS 2.5.1. DTMF SIGNAL TONE TRANSMIT SELECTION Note: After performing this check, do not forget to turn the setting off. Otherwise, dialing using DTMF will not be possible. 2.5.2. BUTTON CODE TABLE Note: These codes (00, 01) are only for the data in the History Report. 2.5.3.
KX-FT21RS 2.6. JOURNAL 3 Descriptions: 1. ENCODE Compression Code: MH/MR 2. MSLT MSLT means Minimum Scan Line Time. Used only at the factory. 3. RESOLUTION Indicates the resolution of the communication. If multiple pages are transmitted or received, it indicates the last page´s resolution. If there is a communication error, “?” is displayed. 4. RCV-TRIG. (CNT.) Indicates the trigger that causes the unit to switch to the fax receive mode. The available options are listed in JOURNAL 2 in 2.6.1.
KX-FT21RS 2.6.1.
KX-FT21RS 3 ADJUSTMENTS 3.1. ADJUSTING THE FEED PRESSURE If no feeding or multiple feeding occurs frequently, adjust the feeder pressure. 1. Open the front lid by pressing the front lid open. 2. Shift the position of the lever using an instrument with a pointed end, such as paper clip. Right: When documents do not feed. Center: Standard position (pre-selected) Left: When documents multiple feed. 3. Close the front lid by gently pressing down on both ends.
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KX-FT21RS 5 HOW TO REPLACE THE FLAT PACKAGE IC If you do not have the special tools (for example: SPOT HEATER) to remove the SPOT HEATER´S Flat IC, if you have solder (large amount), a soldering iron, and a cutter knife, you can easily remove the ICs even if there are more than 100 pins. 5.1. PREPARATION · SOLDER Sparkle Solder 115A-1, 115B-1 OR Almit Solder KR-19, KR-19RMA · Soldering iron Recommended power consumption is between 30 W to 40 W.
KX-FT21RS 5.3. FLAT PACKAGE IC INSTALLATION PROCEDURE 5.4.
KX-FT21RS 6 CIRCUIT OPERATIONS CONNECTION DIAGRAM 1 2 3 4 5 6 7 8 +24V +24V +24V GND GND GND +5V NC 1 2 3 4 5 COM LATCH STB1 GND VDD 1 2 3 4 5 6 TH CLOCK GND STR2 SI COM MOTOR A B NA NB CO CN1 1 2 3 4 5 6 7 8 CN4 1 2 3 4 5 6 7 8 9 10 11 CN3 1 2 3 4 5 CN5 1 2 SENSOR 1 2 3 4 5 CIS 6 7 8 9 10 V.LED G.
KX-FT21RS 6.2. GENERAL BLOCK DIAGRAM The control section will be explained as shown in the block diagram. 1. ASIC (IC1) Composed mainly of an address decoder, modem control section, CPU and RTC. Controls the general FAX operations. Controls the operation panel I/F. Controls the thermal head I/F and CIS I/F. Executes image processing. Monitors the H/S volume. I/O ports 2. ROM (IC2) Contains all of the program instructions for unit operations. 3.
6.2.1. OPERATION PANEL POWER SUPPLY REG +24V LCD SELE CTOR +5V SENSOR KEY MATRIX DIGITAL BOARD MOS SW 5V +24V +5V REG 3.3V +5V SRAM 256k ROM 1M CODEC RESET I/O CIS 99 THERMAL HEAD +24V ANALOG BOARD PRINTER CONTROL OSC CPU I/F OP PANEL I/F ANA LOG SW SENSOR MODEM MOTOR I/F RTC EXT.
D0-7 D0-7 RD RD WR CIS-CTL CLK, SIG 24V XWDERR TO THERMAL HEAD D0-7 ASIC IC1 TH ON HEAD-CTL Q13 H/S RX VOL SP TO OPE PANEL KSTART,KLATCH,KSCLK,KTXD,KRXD,KIN0,KIN1,KIN2,KIN3 RS,E STBI-2,THLAT THCLK,THDAT 32.768KHz 24MHz (IC7) 5V (IC4) RX RXIN H/S TX XRESETI TO CIS A0-17 100 +5V LED ON RD IC7 WR +24V TX TXOUT 20.
KX-FT21RS 6.3.2. ASIC (IC1) This custom IC is used for general FAX operations. 1. CPU This model uses a Z80 equivalent CPU operating at 6MHz. Many of the peripheral functions are handled by custom designed LSIS. As a result, the CPU only needs to process the result. 2. RTC Real time clock. 3. DECODER Decodes the address. 4. MODEM Execute modulation and demodulation for the FAX. 5. ROM/RAM I/F Controls the SELECT signal of ROM or RAM and bank switching. 6. CIS I/F Controls document reading. 7.
KX-FT21RS Pin 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 Pin Name IRDATXD/IOP81 IRDARXD/IOP80 TXD/IOP30 RXD/IOP31 XRTS/IOP32 XCTS/IOP33 XDSR/IOP34 DCD/IOP35 XDTR/IOP36 RI/CLK/IOP37 IOP90 IOP91 VSS IOP92 IOP93 IOP94 IOP95 3.
KX-FT21RS Pin 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 Pin Name Buffer Power supply TEST3 3.3V XOUT 3.3V XIN 3.3V VSS 3.3V TEST4 3.3V XHSTWR/IOP41 3.3V XOPRBE/MUX/OP53 3.3V XRAS/IOP42 3.3V XCAS1/IOP43 3.3V XCAS2/IOP44 3.3V DB3 3.3V DB2 3.3V DB4 3.3V DB1 3.3V DB5 3.3V DB0 3.3V DB6 3.
KX-FT21RS Pin 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 Pin Name STB2 STB3 STB4 THDAT VSS MULT3/5 THCLK THLAT STBNP 3.3V TXD2/IOP RXD2/IOP RTS2/IOP CTS2/IOP DSR2/IOP DCD2/IOP DTR2/IOP RI2/IOP XRSTSWI/IP83 KEYIN0 KEYIN1 KEYIN2 KEYIN3 KEYIN4 KEYIN5 OPLED VSS 3.
KX-FT21RS 6.3.3. ROM (IC2) This 128 KB ROM (OTPROM or MASKROM) has 32 KB of common area and bank area (BK4~BK15). The capacity of each bank is 8 KB. The addresses of the common area are from 0000H to 7FFFH, and addresses 8000H to 9FFFH are for the bank area. 6.3.4. RAM (IC3) This 32 KB RAM has 8 KB of common area and bank area (BK0, BK1). The capacity of each bank is 12 KB. The addresses of the common area are from D000H to EFFFH, and addresses A000H to CFFFH are for the bank area. 6.3.5.
KX-FT21RS 6.3.6. SRAM and RTC BACK UP CIRCUIT 1. Function This unit has a lithium battery (BAT1) which works for the RAM (IC3) and Real Time Clock (RTC, Integrated into ASIC:IC1). The user parameter for auto dial numbers, the transmission ID, the system setup date and so on are stored in the RAM (IC3). The RTC continues functioning, even when the power switch is OFF, backed up by a lithium battery. 2. Circuit Operation When the power is turned ON, power is supplied RAM (IC3) and RTC (IC1).
KX-FT21RS 6.3.7. SUPERVISION CIRCUIT FOR THE THERMAL HEAD TEMPERATURE 1. Function The thermistor changes the resistor according to the temperature and uses the thermistor´s characteristics. The output of pin 193 of IC1 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.
KX-FT21RS 6.3.8. LED ARRAY(CIS) The LED ARRAY will light during transmission and copying as a light source to recognize document characters, patterns, or graphics on a document. It is also possible to light the LED ARRAY in the test mode.
KX-FT21RS 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, via route (1), and is input to IC1. 2. In IC1, the data is adjusted to a suitable level for A/D conversion in the Analog Signal Processing Section, and via route (2) it is input to A/D conversion (8 bit). After finishing A/D conversion, the data is input to the Image Processing Section via route (3).
KX-FT21RS 6.4.2. Block Diagram SYSTEM BUS IC1 A (2) (1) D IC3 CONTACT IMAGE SENSOR (3) ANALOG SIGNAL PROCESSING SECTION (12) RAM IMAGE (11) PROCESSING SECTION IC2 (7) ROM CPU (4) (13) (5) (10) (6) RAM (14) (15) (8) MODEM (9) Analog Front/End IC5 (AFE) P/S CONVERTER NCU TEL.
KX-FT21RS 6.4.3. THERMAL HEAD 1. Function This unit utilizes state of the art thermal printer technology. The recording paper (roll paper) is chemically processed. When the thermal head contacts this paper it emits heat momentarily, and black dots (appearing like points) are printed on the paper. If this continues, letters and/or diagrams appear, and the original document is reproduced. 2.
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KX-FT21RS 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 is inserted and the start button pressed, pin 154 of IC1 goes to a high level and the transistor inside IC7 turns on. This applies voltage to the LED array to light it.
KX-FT21RS 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 drive, gate array IC1 pin 153 becomes a high level, and Q14 and Q7 go ON as a result. +24 V is supplied to the motor coil. Stepping pulses are output from gate array IC1, causing driver IC7 to go ON.
KX-FT21RS 6.4.6. GEAR SECTION This section shows how the motor-driven gear mechanism works in the main operations: FAX transmission, FAX reception the motor and copying. 6.4.6.1. Mode Selection When the motor attached to the Drive Motor Gear rotates counterclockwise (CCW), Swing Gear A-2 engages the CAM and the CAM turns counterclockwise to select a mode. (See Fig. A.) There are three mode options controlled by the Switch: A: Transmitmode, B: Receive mode and C: Copy mode. In Fig.
KX-FT21RS 6.4.6.2. Mode Operation Once a mode is selected, the Drive Motor Gear rotates clockwise (CW) and then the Swing Gear A-1 controls the mode operation. A: Transmit mode Swing Gear A-1 engages G6 and conveys its drive power to the Separation Roller Gear for pre-feeding documents. B: Receive mode Swing Gear B engages G8 and conveys its drive power to the Platen Roller Gear for printing the received data.
KX-FT21RS 6.4.6.3.2. Scanning 6.4.6.3.3. Printing Note: See 6.5. SENSERS AND SWITCHES.
KX-FT21RS 6.4.6.3.4.
KX-FT21RS 6.5. SENSORS AND SWITCHES All of the sensor and switches are shown below.
KX-FT21RS 6.5.1. Motor Position Sensor This sensor is a detection switch for recording the position of the CAM. Digital Board Home position Other 6.5.2. Signal (IC1-174 Pin) Low level High level Recording Paper Sensor (SW201) When there is no recording paper, the plate is separated from the switch lever and the switch turns off. Pin 9 of CN102 (Analog board) becomes a high level. When there is recording paper, the plate pushes the switch lever and the switch turns ON.
KX-FT21RS 6.5.3. Read Position Sensor (PS2) When a document is brought to the read position, the shelter plate passes the sensor light, the photo transistor becomes ON, and the input signal of the CN2-3 pin (Operation) becomes a low level. When there is no document at the read position, the shelter plate closes the sensor light, the photo transistor becomes OFF, and the input signal of the CN2-3 pin (Operation) becomes a high level. (When checking this sensor, CN1-8 pin, 2pin becomes low level).
KX-FT21RS 6.6. MODEM SECTION 6.6.1. FUNCTION The unit uses a 1 chip modem (IC1), enabling it to act as an interface between the control section for FAX sending and receiving, and the telephone line. During a sending operation, the digital image signals are modulated and sent to the telephone line. During a receiving operation, the analog image signals which are received via the telephone line are demodulated and converted into digital image signals.
KX-FT21RS Phase D is the procedure for confirming that the message is completed and received. For continuous transmission, phase B or phase C are repeated for transmission. Phase E : Call retrieval Phase E is the procedure for call retrieval, that is for circuit disconnection. 4. Concerning Transmission Time Transmission Time = Control Time + Image Transmission Time + Hold Time Transmission time consists of the following.
KX-FT21RS Explanation of Signals Control signals are comprised mainly of 8-bit identification signals and of the data signals added to them. Data signals are added to DIS and DCS signals. Signal.....DIS (Digital Identification Signal) Identification Signal Format.....00000001 Function: Notifies the capacity of the receiving unit. The added data signals are as follows. (Example) Bit No. 1 2 3 4 5 6 7 8 9 10 11, 12 (0, 0) (0, 1) (1, 0) (1, 1) 13 14 15 16 DIS/DTC Transmitter - T.2 operation Receiver - T.
KX-FT21RS Bit No.
KX-FT21RS Note 2 - Standard facsimile units conforming to T.3 must have the following capability: Index of cooperation (IOC)=264. Note 3 - Standard facsimile units conforming to T.4 must have the following capability: Paper length=297 mm. Signal Training 2 Image Signal RTC (Return to Control) ——————— Refer to the next page.
KX-FT21RS b. Redundancy Compression Process Coding Mode This unit uses one-dimensional MH format.
KX-FT21RS 6.6.2. MODEM CIRCUIT OPERATION The ASIC (IC1) has all the hardware satisfying the ITU-T standards mentioned previously. The modem is included in IC1. The signal communicates with the TEL line through the analog front end IC (IC5) of digital/analog, analog/digital convertor. The modem in IC1 is operated using the 20.736 MHz (x2) clock. 1.
6.7.
KX-FT21RS 6.8. 6.8.1. NCU SECTION GENERAL This section is the interface between the telephone line and external telephone. It is composed of an EXT. TEL Line relay (RLY1), bell detection circuit, EXT TEL selection circuit, pulse dialing circuit, line amplifier, sidetone circuits and multiplexer. 6.8.2. Line Relay (RLY1) 1. Circuit Operation Normally, this relay switches to the external telephone side (Break) and switches to the open side (make) when the unit starts facsimile communication.
KX-FT21RS 6.8.5. LINE AMPLIFIER AND SIDE TONE CIRCUITS 1. Circuit Operation The reception signal received as output from line transformer T101 is given as input to R104, C107, R112, and IC101 (8). Then it is input to the reception system at an amplifier gain of 5.9 dB from pin (7). The transmission signal is input from CN202 pin (1), and output to the TEL line through C106, R103, R102 and T101. Without a side tone circuit, the transmission signal would return to the reception amplifier via C106.
KX-FT21RS 6.9. 6.9.1. ITS (Integrated telephone System) and MONITOR SECTION GENERAL During the monitor operation, the speaker output passes through the power amplifier (IC102) [Analog board]. The DTMF signal is output from the modem (IC1: digital board). The alarm tone, the key tone, bell tone, and beep are output from gate array IC1 (digital board). During a pulse dial operation, the monitor tone is output from gate array IC1. 6.9.2. MONITOR CIRCUIT 1.
KX-FT21RS 6.10. EXT. TEL EXT. TEL JACK is provided for the external TEL connection. Connect the telephone to the EXT. TEL JACK. Because the unit (FT21) has the priority, EXT. TEL is disconnected when the unit is OFF-HOOK. 1. EXT. TEL DC LOOP (Signal Path) b → POS1 → LF1 → RLY1 (3) → RLY1 (2) → L5 → EXT.TEL → L6 → RLY1 (7) → RLY1 (6) → LF1 → F1 → a 2. REMOTE RECEIVING This is the parallel connection DTMF signal for the TEL or EXT. TEL mode between T and R.
7 C107 R104 R112 6 R102 R110 C111 R107 R103 C113 R109 R108 C105 R105 IC101 5 R111 C127 IC103 RELAY C112 10 R106 5 R13 T101 +5VD C9 RLY1 6 7 4 2 Q7 LF1 3 b SA2 RLY1 BREAK C117 Analog Board LINERX 10 CN102 RELAY Q3 Q2 R117 10 CN9 To A 3 C126 1 4 2 C116 T102 C14 L5 R116 IC103 R16 Digital Board C43 11 POS1 +24VD D4 1 Analog Front End (IC5) a LINETX A IC6 CN1 F1 SA1 PC1 C106 11 D1 Q4 C8 R12 CN2 a L6 b R18 C13 10 R33 C12 MTX ENB BELL 134 R19 PC5
KX-FT21RS 6.11. OPERATION PANEL The unit consists of an LCD (Liquid crystal display), KEYs, photo interrupters (sensor), and analog switches (for key scan). The key scan (analog switch control, reading), sensor detection (sensor control, reading) and LCD control are all controlled by I/O of ASIC (IC1) on the digital board. Fig. a 6.11.1. KEY SCAN When CN1(8) (OPSEL) is "H", the analog switch (IC1) is available. The "KLATCH", "KSCLK" and "KTXD" control the analog switch (IC1) to read at KIN0~3.
KX-FT21RS 6.11.2. SENSOR DETECTION When CN1(8) (OPSEL) is "L", the detection of the document sensor and read start position sensor are available. 6.11.3. LCD CONTROL "KTXD", "KSCLK", "KLATCH" and "KSTART" are sent as D4~D7 to control the LCD.
KX-FT21RS 6.12. 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. [Rectifier Circuit] The input current is rectified by D101,D102,D103 and D104 and charges C106 to make DC voltage. Then it supplies power to the converter circuit.
KX-FT21RS 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 Q1 is ON, the energy is charged in the transformer primary coil according to E1. When Q1 is OFF, the energy is output from the secondary transformer as follows. L → D1 → Load → L Then the power is supplied to the Load. When Q1 is ON, power is not output from the secondary side.
KX-FT21RS [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. In this power supply, the duty ratio is defined by changing the ON period of the main transistor. This is shown as follows.
KX-FT21RS 7 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.
KX-FT21RS 8 PRINTED CIRCUIT BOARD 104 157 R1 C49 CN10 R118 R57 C56 R46 1 R62 IC9 C27 R60 R58 1 IC6 8 C55 R89 C83 R91 R90 C82 141 Q10 14 PFUP1183ZA C67 C60 C53 R44 8 7 C63 C45 5 C84 PIN1 4 R117 R107 R106 R28 R110 R94 C62 R35 C57 F2 Q12 C42 R109 R108 C40 C15 L17 10 R97 R93 J4 IC4 CN8 2 R95 X1 62 R40 R96 9 2 C23 R6 R99 C20 R7 1 R4 C18 CN6 CN5 6 L8 1 R56 C24 C11 C4 63 8 10 C79 L9 5 C85 L14 R8 C54 C61 R53 C6 L13 1 IC8 R29 1 2
KX-FT21RS PRINTED CIRCUIT BOARD (DIGITAL BOARD): BOTTOM VIEW 8 1 C37 J6 J5 Q13 J7 5 R19 4 8.2.
KX-FT21RS PRINTED CIRCUIT BOARD (ANALOG BOARD): COMPONENT VIEW PFUP1182ZA CN102 R23 10 1 10 2 1 C123 C9 PC3 PC2 R16 CN2 R15 R7 C16 R6 D202 CN201 Q4 143 C7 C213 JP5 JP4 CN1 D101 D102 D4 ZNR2 C3 D201 D3 JP30 E C8 Q7 C2 E Q6 JP6 R18 C201 T101 SW202 D6 R21 C11 ZNR1 L6 L5 C12 F1 C15 SA1 POS1 SA2 L1 D5 JP7 R19 C1 C13 JP20 CN101 C122 LF1 L7 D203 C120 R20 L8 C225 C106 C231 PC1 PC5 C230 D2 RLY1 PC4 IC1 T102 JP3 CN202 SW201 R4 1 D103 D1
KX-FT21RS PRINTED CIRCUIT BOARD (ANALOG BOARD): BOTTOM VIEW L203 C233 C5 R207 C216 R220 R216 R219 C232 R215 R208 R12 R13 L201 R221 C217 L204 R9 R101 C101 L3 Q101 C240 R123 C4 R22 R1 R233 R232 C104 C226 8 5 IC102 1 R251 C126 C219 C218 C125 R124 R229 R224 C220 R225 R226 R252 8 D7 R235 R234 R5 R218 C215 C235 C224 J402 J403 C223 R228 144 4 1 IC202 Q2 Q3 R231 C227 R227 R204 5 R211 C211 8 1 C10 R17 C103 R105 R106 R107 R201 4 R2 C229 R115 C115 R230 R111 C113
KX-FT21RS 8.5. PRINTED CIRCUIT BOARD (SWITCHING POWER SUPPLY) (COMPONENT VIEW) (BOTTOM VIEW) CAUTION SRF913EK MITSUMI ELEC. CO., LTD. FOR CONTINUED PROTECTION AGAINST RISK OF FIRE. REPLACE ONLY WITH SAME TYPE CN31 T3.15AH 250V AND RATINGS N L OF FUSE F101 ( F101 ) R101 CN31 T3.
SW28 SW13 SW3 SW29 SW14 R16 SW22 SW24 SW10 J43 SW18 J41 J32 Q1 J37 SW7 SW17 SW2 PS2 J16 PFUP1146Z SW1 J31 J17 SW9 C2 J7 R28 R31 R32 R33 R34 146 C7 C8 J4 R14 R18 R13 J18 R15 R20 16 + RED R17 IC1 J2 C6 BLACK Ð SW15 J8 J28 SW8 SW11 R21 R22 R23 R24 R25 R26 FOR CHECKER R12 1 PFUP1146Z J14 SW16 J24 PS1 J30 AUTO-CH PCB-CH SW26 SW19 SW30 J35 J34 J38 SW12 SW27 SW20 SW5 (COMPONENT VIEW) R11 C9 Q3 R7 J15 R2 9 8 SW23 D1 J23 J39 J29 J40 J20 J21
KX-FT21RS 9 SCHEMATIC DIAGRAM 9.1. SCHEMATIC DIAGRAM (DIGITAL CIRCUIT) CIS LED ARRAY ON: 3.3V OFF: 0V T5 T4 T3 3.3V T2 FAX TX signal 0V FAX RX signal MOTOR ON: 3.3V OFF: 0V PRINTING 23~24V PRINTING 3.
KX-FT21RS 9.2. SCHEMATIC DIAGRAM (ANALOG CIRCUIT) FAX TX FAX RX LINE ON/OFF, DIALPULSE 3.3V 0V FAX RX, TEL TALK 2V BELL DETECT 2.
KX-FT21RS SCHEMATIC DIAGRAM (SWITCHING POWER SUPPLY) 540V Cycle=13ms 12V 1000p/(1KV) 0V T101 TRANS C108 200K/(2W) CN301 R101 R127 C124 1M 1/(2W) 1.8K 0.22 680/(2W) R205 27K 5K 1/(50V) R225 100 3.3K R224 VR201 2.2K R221 2.2K PC101 C205 C201 10K 68 R121 R107 D106 R222 L103 120K 150K R223 IC202 D202 D108 R108 10K 47/(35V) C204 1000/(16V) C203 8 5.
KX-FT21RS 9.4. SCHEMATIC DIAGRAM (OPERATION CIRCUIT) 5V 0V KEY SCAN 0V SENSOR SCAN 5V 5V 0V OV/3.
KX-FT21RS 10 TERMINAL GUIDE OF THE IC´S TRANSISTORS AND DIODES 151
KX-FT21RS 11 FIXTURES AND TOOLS 152
KX-FT21RS 12 CABINET, MECHANICAL AND ELECTRICAL PARTS LOCATION 12.1.
KX-FT21RS 12.2.
KX-FT21RS 12.3. LOWER CABINET/P.C.B.
KX-FT21RS 12.4. MOTOR SECTION Note: Make sure that Gears 1, 2 and 3 are installed face up. (The product number is put on the face.
KX-FT21RS 12.5.
KX-FT21RS 13 ACCESSORIES AND PACKING MATERIALS 158
KX-FT21RS 14 REPLACEMENT PARTS LIST This replacement parts list is for KX-FT21RS only. Refer to the simplified manual (cover) for other areas. Notes: 1. The marking (RTL) indicates that the Retention Time is limited for this item. After the discontinuation of this assembly in production, the item will continue to be available for a specific period of time. The retention period of availability is dependent on the type of assembly, and in accordance with the laws governing parts and product retention.
KX-FT21RS Ref. No. 108 109 Part No. Part Name & Description PFDE1097Z PFUS1214Z LEVER PAPER SENSOR SPRING, EARTH 110 111 112 113 114 KR06TT251508 PQLB1E1 KR06TT251508 PQHR136Z PFHX1340Z FFERRITE CORE FFERRITE CORE FFERRITE CORE CLAMPER BOTTOM PLATE SHEET Remarks (14.1.4.
KX-FT21RS Ref. No. Part No. Part Name & Description Remarks Ref. No. R46 R49 Part No. Part Name & Description ERJ3GEYJ123 ERJ3GEYJ683 12k 68k R51 R52 R53 R54 R56 R57 R58 R59 ERJ3GEYJ153 ERJ3GEYJ224 ERJ3GEYJ154 ERJ3GEYJ105 ERJ3GEYJ123 ERJ3GEYJ224 ERJ3GEYJ472 ERJ3GEYJ334 15k 220k 150k 1M 12k 220k 4.7k 330k R60 R62 R63 R64 R66 R67 R68 R69 ERJ3GEYJ562 ERJ3GEYJ393 ERJ3GEYJ821 ERDS1TJ222 ERJ3GEYJ563 ERJ3GEY0R00 ERJ3GEY0R00 ERJ3GEYJ101 5.6k 39k 820 2.
KX-FT21RS Ref. No. C1 C2 C3 C4 C6 C8 Part No. Part Name & Description Remarks ECUV1H104ZFV ECUV1H104ZFV ECUV1H104ZFV ECUV1C104KBV ECUV1H104ZFV ECUV1H104ZFV 0.1 0.1 0.1 0.1 0.1 0.1 S S S C10 C11 C12 C13 C14 C15 C17 C18 ECUV1H104ZFV ECUV1H104ZFV ECUV1H104ZFV ECUV1H100DCV ECUV1H150JCV ECUV1H102KBV ECUV1H104ZFV ECUV1H103KBV 0.1 0.1 0.1 10P 15P 0.001 0.1 0.01 S S S C20 C21 C24 C26 C27 C28 C29 ECUV1H104ZFV ECUV1H104ZFV ECEA1CK101 ECUV1H104ZFV PQCUV1C224KB ECUV1H104ZFV ECUV1H100DCV 0.1 0.1 100 0.1 0.
KX-FT21RS Ref. No. Part No. Part Name & Description Remarks Ref. No. R107 R108 R109 Part No. Part Name & Description ERJ3GEYJ623 ERJ3GEYJ121 ERJ3GEYJ122 62k 120 1.2k R110 R111 R112 R113 R114 R115 R116 R117 R118 R119 ERJ3GEY0R00 ERJ3GEYJ823 ERJ3GEY0R00 ERJ3GEYJ823 ERJ3GEYJ222 ERJ3GEYJ223 ERJ3GEYJ223 ERJ3GEYJ333 ERJ3GEYJ114 ERJ3GEYJ154 0 82k 0 82k 2.
KX-FT21RS Ref. No. C114 C115 C116 C117 Part No. Part Name & Description Remarks ECUV1C104KBV ECUV1H332KBV ECUV1H103KBV ECUV1H102KBV 0.1 0.0033 0.01 0.001 C120 C121 C122 C125 C126 C127 ECEA1CK101 ECUV1H102KBV ECEA1HKS4R7 ECUV1C104KBV ECUV1C104KBV PQCUV1C474KB 100 0.001 4.7 0.1 0.1 0.47 S C201 C202 C203 C204 C205 C206 C207 C208 C209 ECEA1EK470 ECUV1H103KBV ECUV1H103KBV ECUV1H103KBV ECEA1CKS100 ECUV1C104KBV ECUV1C104KBV ECUV1H471JCV ECUV1H472KBV 47 0.01 0.01 0.01 10 0.1 0.1 470P 0.
KX-FT21RS Ref. No. SW26 SW27 SW28 SW29 Part No. Part Name & Description EVQ11Y05B EVQ11Y05B EVQ11Y05B EVQ11Y05B SPECIAL SPECIAL SPECIAL SPECIAL SW30 EVQ11Y05B SPECIAL SWITCH Remarks SWITCH SWITCH SWITCH SWITCH 14.5. POWER SUPPLY BOARD PARTS Ref. No. PCB5 Part No. PFLP1227EZL Part Name & Description PFVIFA5317P AN1431T PFVITA7805F POWER SUPPLY BOARD ASS´Y (RTL) IC IC IC Part No.
KX-FT21RS Ref. No. Part No. Part Name & Description Remarks (OTHERS) T101 TH101 ETS29AK428AC PFRRT09L8R2F TRANSFORMER THERMISTOR S 14.6. FIXTURES AND TOOLS Ref. No. EC1 EC2 EC3 EC4 EC5 EC6 EC7 EC8 EC9 EC10 Part No.
