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Panasonic KX-TD7685 Service Manual

Dect6.0 portable station
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DECT6.0 Portable Station
KX-TD7685
(for U.S.A.)
© 2008 Panasonic Communications Co., Ltd. All
rights reserved. Unauthorized copying and distribu-
tion is a violation of law.
ORDER NO. KMS0802461CE
F19

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Summary of Contents for Panasonic KX-TD7685

  • Page 1 ORDER NO. KMS0802461CE DECT6.0 Portable Station KX-TD7685 (for U.S.A.) © 2008 Panasonic Communications Co., Ltd. All rights reserved. Unauthorized copying and distribu- tion is a violation of law.

  • Page 2: Table Of Contents

    KX-TD7685 TABLE OF CONTENTS PAGE PAGE 1 Safety Precautions -----------------------------------------------3 10 Disassembly and Assembly Instructions -------------- 40 1.1. For Service Technicians ----------------------------------3 10.1. Handset ---------------------------------------------------- 40 1.2. Caution--------------------------------------------------------3 10.2. Charger----------------------------------------------------- 42 1.3. Battery Caution ---------------------------------------------3 11 Measurements and Adjustments -------------------------- 43 2 Warning --------------------------------------------------------------3 11.1.

  • Page 3: Safety Precautions

    KX-TD7685 1 Safety Precautions 1.1. For Service Technicians • Repair service shall be provided in accordance with repair technology information such as service manual so as to pre- vent fires, injury or electric shock, which can be caused by improper repair work.

  • Page 4: Specifications

    KX-TD7685 2.1.1. Suggested PbF Solder There are several types of PbF solder available commercially. While this product is manufactured using Tin, Silver, and Copper, (Sn+Ag+Cu), you can also use Tin and Copper, (Sn+Cu), or Tin, Zinc, and Bismuth, (Sn+Zn+Bi). Please check the manufac turer's specific instructions for the melting points of their products and any precautions for using their product with other materials.

  • Page 5: Technical Descriptions

    KX-TD7685 4 Technical Descriptions 4.1. Block Diagram (Handset)

  • Page 6: Circuit Operation (Handset)

    KX-TD7685 4.2. Circuit Operation (Handset) 4.2.1. Outline Handset consists of the following ICs as shown in 4.1. Block Diagram (Handset). •BBIC (Base Band IC): IC201 -All data signals (forming/analyzing ACK or CMD signal) -All interfaces (ex: Key, Detector Circuit, Charge, LCD) Include EEPROM and Flash memory EEPROM stores the temporary operating parameters (for RF, etc.)
  • Page 7 KX-TD7685 4.2.3. Charge Circuit (Include Charger) When charging the handset on the charger, Q1 of charger is turned on and battery charging starts, the charge current is as fol- lows; DC+(6.5V) → L1 → Q1 → R3 → JT1(Charger) → JT101(Handset) → L101 → Q101→ D102→ L104 → BATTERY+ ... Battery ...
  • Page 8 KX-TD7685 4.2.6. RX Audio Path Receiver Burst data is input from RF Module (IC601) to pin 17 (RXDA) of IC201. In IC201, the burst data is converted to ADPCM, then to analog signal, and sent from pin 68 (LSR+) and pin 69 (LSR-) to the receiver.
  • Page 9 KX-TD7685 4.2.7. LCD Circuit The LCD is controlled by 3 control signal (SCL1, P2-1, P3-7) and SERIAL data (SDA1) of IC201. 4.2.8. LED Circuit BBIC (IC201) controls each LED through MIDI (IC301). Type of LED LED ON LED OFF IC301...
  • Page 10 KX-TD7685 4.2.9. Ringer Circuit During ringing, a signal is sent from pin 10 and pin 11 of IC301 to a monitor speaker through speaker Amplifier IC (IC401). At this time, BBIC (IC201) makes pin 1 of IC401 from low to high.

  • Page 11: Location Of Controls And Components

    KX-TD7685 5 Location of Controls and Components 5.1. Handset...
  • Page 12 KX-TD7685...

  • Page 13: Installation Instructions

    KX-TD7685 6 Installation Instructions 6.1. Connection and Setting 6.1.1. Charger Connection • The AC adaptor should be connected to a vertically oriented or floor-mounted AC outlet. Do not connect the AC adaptor to a ceiling-mounted AC outlet, as the weight of the adaptor may cause it to become disconnected.
  • Page 14 2. Press the notch on the cover firmly and slide it as indicated by the arrow. 3. Open the cover and replace the battery. 4. Close the cover and charge the handset. Please use a Panasonic batteries with the service part number N4HHGMB00005 or HHR-P103.

  • Page 15: Test Mode

    KX-TD7685 7 Test Mode 7.1. Required Equipment 1. Personal Computer with serial port. 2. RS-232C cable for Handset (PSZZ1TD7896M). 3. Maintenance software for PC (PSZZ3TD7896M). 7.2. Initial Setting 1. Connect the handset with your PC with the RS-232C cable. 2. Copy the Maintenance software (FlashProgram.exe) from Floppy Disk to your PC and double click the FlashProgram.exe to...

  • Page 16: Command Reference

    KX-TD7685 3. Set communication environment Click “Config” and configure as follows: Click “OK”. Selected items will be stored. 7.3. Command Reference 7.3.1. Select From Command Menu - Example of Operation - 1. Click [test command] tag.
  • Page 17 KX-TD7685 2. Click [ Command menu ] button and select the command that you want execute. (in case of test command "EPW") 3. Set parameters if necessary.
  • Page 18 KX-TD7685 4. Click [send] button. Maintenance Window is generated, and transmitted command and parameters are displayed. Then receive data from the Handset is displayed. - Operation of each test command - A) Test Command "VDD control (VDD)" 1.Click [Command menu] button.
  • Page 19 KX-TD7685 D) Test Command "AD1" 1.Click [Command menu] button. 2.Point [battery]. 3.Click [VBAT1 read (AD1)]. 4.Click [Send] button. (if returned value is "OK", It succeeded. ) E) Test Command "loopback mode (PP)" 1.Click [Command menu] button. 2.Point [RF]. 3.Point [test mode].
  • Page 20 KX-TD7685 J) Test Command "PS ID read(IDR)" 1.Click [Command menu] button. 2.Point [others]. 3.Click [PS ID read (IDR)]. 4.Click [Send] button. (Returned value is ID of Handset.) K)Test Command "software version (VER)" 1.Click [Command menu] button. 2.Point [others]. 3.Click [software version (VER)].
  • Page 21 KX-TD7685 7.3.2. Input The Command Directly Menu - Example of Operation - 1. Click [test command] tag. 2. Input the command and parameter (if necessary) directly to the [command] box. (Don't set parameter to the [parameter] box. ) (in case of test command "WB2") 3.
  • Page 22 KX-TD7685 Note: When you overwrite the command used last time and input a new command, it is no problem though parameter of old command remains. - Operation of each test command - A) Test Command "WB2" 1.Input the command and one parameter directly to the [command] box.
  • Page 23 KX-TD7685 H) Test Command "LDC" 1. Input the command and one parameter ("0"(Normal Mode) / "1"(Not enter low duty cycle Mode) ) directly to the [command] box. (Example : LDC 1) 2.Click [Send] button. (if returned value is "OK", It succeeded.) I) Test Command "LOP"...

  • Page 24: Service Mode

    KX-TD7685 8 Service Mode 8.1. Software Upload 8.1.1. Required Equipment 1. Personal Computer with serial port. 2. RS232C cable for Handset (PSZZ1TD7896M) 3. Maintenance software for PC (PSZZ3TD7896M) 8.1.2. Before Uploading Step1 Run "FlashProgram.exe". Then, following screen appears.
  • Page 25 KX-TD7685 Step2 Set communication environment Click "Config" and configure as follows: Click "OK". Selected items will be stored. 8.1.3. How To Upload Step 3 Connect Handset and PC with the RS-232C cable. Caution: COM port on PC should match with the one selected in Step 2.
  • Page 26 This operation will not turn the power of target to ON. If the target's power turns on, check following items. Then try again from Step 1. (A) Check the connection of "PC" and "KX-TD7685 Handset" with RS-232C cable. (B) Check Configuration. (Refer to Step 2.)
  • Page 27 KX-TD7685 5-4. Click "Download". Then start communicating PC with the target. Don't release the "POWER" key in this step. If the "POWER key is released, uploading will be failed. 5-5.Communication check "OK" If communication check result is OK, "CRC ok" will be displayed.
  • Page 28 KX-TD7685 5-6.Uploading Start After several seconds, "Flash Program Start" will be displayed. You can release the "POWER" key in this step. 5-7.After uploading completion After uploading is completed, "Download finished successfully!" will be displayed. Click "OK", and disconnect the RS-232C cable.

  • Page 29: Troubleshooting Guide

    KX-TD7685 9 Troubleshooting Guide Note: When you find the suspected parts, check the soldering and resolder or replace the parts if it is necessary. 9.1. Power Trouble (Handset) 9.1.1. Power Does Not Go On Cross Reference: •Adjustment should be done if IC201(BBIC) is replaced. Refer to 9.11.1 When Replacing IC201 (BBIC).

  • Page 30: Battery Charge Trouble (Handset)

    KX-TD7685 9.1.2. No Display On The LCD Cross Reference: • Adjustment should be done if IC201(BBIC) is replaced. Refer to 9.11.1 When Replacing IC201 (BBIC). • Adjustment should be done if LCD unit is replaced. Refer to Section 11.1.6.Adjustment for LCD Contrast 9.2.
  • Page 31 KX-TD7685 9.2.2. Charge Off Cross Reference: •Adjustment should be done if IC201(BBIC) is replaced. Refer to 9.11.1 When Replacing IC201 (BBIC).

  • Page 32: Led Trouble (Handset)

    KX-TD7685 9.3. LED Trouble (Handset) 9.3.1. Key Back-Light And LCD Back-Light Cross Reference: •Adjustment should be done if IC201(BBIC) is replaced. Refer to 9.11.1 When Replacing IC201 (BBIC). 9.3.2. Charging And Ringing LED Cross Reference: •Adjustment should be done if IC201(BBIC) is replaced. Refer to 9.11.1 When Replacing IC201 (BBIC).

  • Page 33: Vibrator Trouble (Handset)

    KX-TD7685 9.4. Vibrator Trouble (Handset) Cross Reference: •Adjustment should be done if IC201(BBIC) is replaced. Refer to 9.11.1 When Replacing IC201 (BBIC). 9.5. Ringer Trouble (Handset) Cross Reference: •Adjustment should be done if IC201(BBIC) is replaced. Refer to 9.11.1 When Replacing IC201 (BBIC).

  • Page 34: Key Click Sound Trouble (Handset)

    KX-TD7685 9.6. Key Click Sound Trouble (Handset) Cross Reference: •Adjustment should be done if IC201(BBIC) is replaced. Refer to 9.11.1 When Replacing IC201 (BBIC).

  • Page 35: No Link Trouble

    KX-TD7685 9.7. No Link Trouble Cross Reference: •Adjustment should be done if IC201(BBIC) or Main Board is replaced. Refer to 9.11 Things to Do After Replacing Main Board / BBIC.

  • Page 36: No Voice Transmission

    KX-TD7685 9.8. No Voice Transmission Cross Reference: •Adjustment should be done if IC201(BBIC) is replaced. Refer to 9.11.1 When Replacing IC201 (BBIC).

  • Page 37: No Voice Reception

    KX-TD7685 9.9. No Voice Reception 9.9.1. Talk Mode Cross Reference: •Adjustment should be done if IC201(BBIC) is replaced. Refer to 9.11.1 When Replacing IC201 (BBIC).

  • Page 38: Password Trouble

    KX-TD7685 9.9.2. Speakerphone Mode Cross Reference: •Adjustment should be done if IC201(BBIC) is replaced. Refer to 9.11.1 When Replacing IC201 (BBIC). 9.10. Password Trouble 9.10.1. User Password is forgotten. Test command "PWC"(Refer to Section 7.3.2. (K) ) set user password to "1234".

  • Page 39: Things To Do After Replacing Main Board / Bbic

    KX-TD7685 9.11. Things to Do After Replacing Main Board / BBIC 9.11.1. When Replacing IC201 (BBIC) (1) Software upload (Refer to Section 8.1.) (2) Initialize (Refer to Section 7.3.1. (L) ) (3) Adjustment for 1.8V (Refer to Section 11.1.3.) (4) Adjustment for RF Clock (Refer to Section 11.1.4.) (5) Adjustment for Battery Low Detection (Refer to Section 11.1.5.)

  • Page 40: Disassembly And Assembly Instructions

    KX-TD7685 10 Disassembly and Assembly Instructions 10.1. Handset 1. Remove the Battery Cover sliding it in the direction of the arrow. 2. Take the Battery out of the Rear Cabinet. 3. Remove two Screws (A) from the Rear Cabinet. 4. Unfasten the Front Cabinet / Rear Cabinet after rotating in the...
  • Page 41 KX-TD7685 5. Remove three Screws (B), and the Charge Terminal (R)/(L) from the Front Cabinet. 6. Remove the Main Board from the Front Cabinet. Caution: Remove/insert the FFC of LCD according to the illustration.

  • Page 42: Charger

    KX-TD7685 10.2. Charger 1. Remove the two screws (C), and remove the Bottom Cabinet. 2. Remove the Main Board from the Top Cabinet.

  • Page 43: Measurements And Adjustments

    Other: with serial port TOOL RS-232C cable PSZZ1TD7896M Serial cable between PC and KX-TD7685 (Same as cable for TD7896) Maintenance software for PC PSZZ3TD7896M Supplied by Floppy Disk (Same as the software for TD7896) 11.1.2. Preparation 1. Open the battery cover and remove the battery from Handset.
  • Page 44 KX-TD7685 11.1.4. Adjustment for RF Clock 1. Run Test command "RF clock (RFC)". 2. Measure RF clock frequency at test point SYRI by frequency counter. (Refer to 14.1 Printed Circuit Board of Hand- set(Main).) 3. Adjust RF clock within 10,368.000kHz +/- 10Hz by Test command "frequency trimming(SFR)".
  • Page 45 KX-TD7685 11.1.6. Adjustment for LCD Contrast 1. Insert battery in handset. 2. Keep to push "1","0","3","Power"keys simultaneously for 3 seconds or more, and release. Confirm the "Test Mode" is started as shown in Fig 1. 3. Push into the joystick ,and go to menu screen (refer to Fig.2).

  • Page 46: Adjustment For Rf Part (Handset)

    OS: Windows 98, 2000, XP Other: with serial port Tool RS-232C cable PSZZ1TD7896M Serial cable between PC and KX-TD7685 (Same as cable for TD7896) Battery for PS N4HHGMB00005 Same as battery for KX-TD7685 Handset Maintenance software for PC PSZZ3TD7896M Supplied by Floppy Disk 11.2.2.
  • Page 47 KX-TD7685 8. DIGITAL RADIO TESTER CTS60 Configration. 1. PP type “Default PP type edit” QMUX : 03060306 2. RF Modulation Signal : FDECT BUST(FIG31) 3. Carrier No. Offset : -18...
  • Page 48 KX-TD7685 9. DIGITAL RADIO TESTER CTS60 set up. Test Mode Manual GAP Mode Portable Part...
  • Page 49 KX-TD7685 11.2.3. Adjustment for RSSI 1. Connect the co-axial cable of handset to CTS60. 2. Press Start and confirm the configration on the CTS60. Config Synchronisation Dummy Slot Dummy Carrier Traffic Slot Traffic Carrier RF Level -82.0dBm Carrier No. Offset...
  • Page 50 KX-TD7685 11.2.4. Adjustment for Modulation 1. Connect the co-axial cable of handset to CTS60. 2. Press Start and confirm the configration on the CTS60. Config Synchronisation Dummy Slot Dummy Carrier Traffic Slot Traffic Carrier RF Level -73.0dBm Carrier No. Offset...
  • Page 51 KX-TD7685 11.2.5. Check Bit Error Rate 1. Connect the co-axial cable of handset to CTS60. 2. Press Start and confirm the configration on the CTS60. Config Synchronisation Dummy Slot Dummy Carrier Traffic Slot Traffic Carrier RF Level -73.0dBm Carrier No. Offset...
  • Page 52 KX-TD7685 11.2.6. Check Transmitting Power 1. Connect the co-axial cable of handset to CTS60. 2. Press Start and confirm the configration on the CTS60. Config Synchronisation Dummy Slot Dummy Carrier Traffic Slot Traffic Carrier RF Level -73.0dBm Carrier No. Offset...
  • Page 53 KX-TD7685 11.2.7. Check Frequency Offset 1. Connect the co-axial cable of handset to CTS60. 2. Press Start and confirm the configration on the CTS60. Config Synchronisation Dummy Slot Dummy Carrier Traffic Slot Traffic Carrier RF Level -73.0dBm Carrier No. Offset...

  • Page 54: Frequency Table

    KX-TD7685 11.2.8. Re-assembly After The Adjustment / Check 1. Remove the battery connected to Handset. 2. Remove the co-axial cable for radio signal measurement from P.C.B.. 3. Solder the JP601 onto the P.C.B.. 4. Put the cabinet cover back on.

  • Page 55: Miscellaneous

    KX-TD7685 12 Miscellaneous 12.1. Terminal Guide of ICs, Transistors and diodes 12.1.1. Handset 12.1.2. Charger...

  • Page 56: How To Replace A Flat Package Ic

    KX-TD7685 12.2. How To Replace a 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 sol- dering iron and a cutter knife, you can easily remove the ICs that have more than 100 pins.
  • Page 57 KX-TD7685 MEMO...

  • Page 58: Schematic Diagram

    KX-TD7685 13 Schematic Diagram 13.1. Handset...
  • Page 59 KX-TD7685...
  • Page 60 KX-TD7685...
  • Page 61 KX-TD7685...

  • Page 62: Charger

    KX-TD7685 13.2. Charger M0.1U 16V 100U Z0.1U...

  • Page 63: Printed Circuit Board

    SW53 SW12 SW22 C211 C418 C123 C109 C110 D102 D311 D310 (5V) Q103 D304 C114 D103 Q102 C102 R417 CN301 SW13 SW03 SW23 C423 (1.8V) R101 R412 C452 R118 C103 SW33 SW43 CN403 Terminals KX-TD7685 BOTTOM VIEW KX-TD7685 COMPONENT VIEW...

  • Page 64: Charger Board

    KX-TD7685 14.2. Charger Board PSUP1645Z KX-TD7685 COMPONENT VIEW PSUP1645Z KX-TD7685 BOTTOM VIEW...

  • Page 65: Appendix Information Of Schematic Diagram

    KX-TD7685 15 Appendix Information of Schematic Diagram Note: 1. DC voltage measurements are taken with an oscilloscope or a tester with a ground. 2. The schematic diagrams and circuit board may be modified at any time with the development of new technology.

  • Page 66: Exploded View And Replacement Parts List

    KX-TD7685 16 Exploded View and Replacement Parts List 16.1. CPU Data 16.1.1. IC201 (BBIC) Terminal Name I/O Setting Pull-up/down Pro- Contents of Control Remark cessing P3[7]/PD7 LCD_A0 P3[1]/PD1 RXDSG RF Timing control signal P3[5]/PD5 SP AMP ON/OFF control signal 1: IC401 ON...
  • Page 67 KX-TD7685 Terminal Name I/O Setting Pull-up/down Pro- Contents of Control Remark cessing VDDE/INT5n/P1[5] COL0 For Key detect SCL2/P3[0] Not in use (pull up) SDA2 Not in use (pull up) Ground 1.8V supply for core P2[0]/PWM0/SPIDI PWM0 Key click sound P2[1]/PWM1/SPICLK...
  • Page 68 KX-TD7685 16.1.2. IC301 (MIDI) Terminal Name I/O Setting Pull-up/down Contents of Control Remark Processing Interrupt request output 1: IRQ to IC201 IFSEL Connect to GND 0: serial interface mode SYNC Not in use (open) AVDD 2.7V supply TESTA Not in use (GND)

  • Page 69: Cabinet And Electrical Parts Location

    KX-TD7685 16.2. Cabinet and Electrical Parts Location 16.2.1. Handset...
  • Page 70 KX-TD7685 16.2.2. Charger...

  • Page 71: Accessories And Packing Materials

    KX-TD7685 16.3. Accessories and Packing Materials...

  • Page 72: Replacement Parts List

    KX-TD7685 16.4. Replacement Parts List Ref. Part No. Part Name & Description Remarks Note: PQJT10204Z TERMINAL (L) 1. RTL (Retention Time Limited) PSHG1287Z RUBBER SPACER PSHR1364Z SPEAKER HOLDER ABS-94HB The “RTL” marking indicates that its Retention Time is L0AD02A00010 SPEAKER Limited.
  • Page 73 KX-TD7685 Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks D309 B3AEB0000061 DIODE(SI) C424 F1J0J2260002 D310 B3AEB0000061 DIODE(SI) C425 F1J0J2260002 D311 B3AEB0000061 DIODE(SI) C426 ECUV1H100DCV D402 B0JCDD000002 DIODE(SI) C428 ECUE1H070DCQ D403 MA8047 DIODE(SI)
  • Page 74 KX-TD7685 16.4.2.2. Main Board Parts (Charger) Ref. Part No. Part Name & Description Remarks Ref. Part No. Part Name & Description Remarks R301 ERJ2GEYJ121 R302 ERJ2GEJ470 PCB200 PSWPD7684MCH PC BOARD W/COMPONENT R304 D0HD270JA002 R306 PQ4R10XJ121 (TRANSISTORS) R307 PQ4R10XJ391 2SD21330SA TRANSISTOR(SI)

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