Panasonic KX-TD7895 - Digital Spread Spedtrum... Service Manual Download Page 14

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8. Remove the Main Board from the Front Cabinet.

5. ADJUSTMENTS (HANDSET)

5.1. EQUIPMENT

1. Radio tester : Marconi Model 2295A or later.

2. DC Power Supply, capable of 3.9V DC supply at 2A.

3. Audio Cable : BNC end to alligator clip end.

4. Soldering Iron, solder, and various tools.

5. AC voltmeter : Available Read out range is -40dBm to 0dBm.

5.2. ADJUSTMENT PREPARATIONS

Refer to Handset Reference Drawing for connection and test point locations.

1. Unscrew both 2 screws from rear cabinet.

2. Remove the rear cabinet from front cabinet.

3. Connect DC power supply (3.9V) to main board (test point VBAT

Summary of Contents for KX-TD7895 - Digital Spread Spedtrum...

Page 1: ...ORDER NO KMS0101535C1 F5 WIRELESS PHONE KX TD7895 for U S A SPECIFICATIONS 2001 Kyushu Matsushita Electric Co Ltd All rights reserved Unauthorized copying and distribution is a violation of law...

Page 2: ...TECHNICIANS ICs and LSIs are vulnerable to static electricity When replacing the following precautions will help prevent recurring malfunctions 1 Cover the plastic parts boxes with aluminum foil 2 Gr...

Page 3: ...3 2 CONNECTIONS OF HANDSET...

Page 4: ...3 3 BASE UNIT...

Page 5: ...4 DISASSEMBLY INSTRUCTIONS 4 1 BASE UNIT...

Page 6: ...1 Remove the four screws A and remove the Bottom Cabinet...

Page 7: ...2 Remove the Main Board from the Top Cabinet 3 Remove the two screws B and remove the RF Unit from the Main Board...

Page 8: ...move the screw C and remove the Antenna from the Top Cabinet Remove the Panel LED and the Button Locate from the Top Cabinet 4 2 HANDSET 1 Remove the Battery Cover sliding it in the direction of the a...

Page 9: ...2 Take the Battery out of the Rear Cabinet after disconnecting the Connector...

Page 10: ...3 Remove two Screws D from the Rear Cabinet...

Page 11: ...ten the Top hook after unfastening Both side hooks to Front Cabinet from Rear Cabinet CAUTION If you open the front cabinet too far the Top hook may snap 5 Remove three Terminal Plates from the Rear C...

Page 12: ...6 Remove the Antenna from the Front Cabinet after removing the Screw E...

Page 13: ...7 Remove the RF unit from the Main Board...

Page 14: ...Cable BNC end to alligator clip end 4 Soldering Iron solder and various tools 5 AC voltmeter Available Read out range is 40dBm to 0dBm 5 2 ADJUSTMENT PREPARATIONS Refer to Handset Reference Drawing fo...

Page 15: ...le to serial port of PC Dsub 9pins connector 3 Start up the Procomm plus and use the script file file name TD7895 WAX 4 Please use Following Commands Test Start Request Commands I O Setting Request Co...

Page 16: ...peaker Output Level Test point SP to 28dBm by VR301 6 CPU DATA 6 1 BASE UNIT IC107 CPU Pin Description I O High High Z Low 1 RES I NORMAL RESET 2 XTAL I 3 EXTAL O 4 MD1 I NORMAL 5 MD0 I 6 NMI I NORMAL...

Page 17: ...SE I NORMAL 33 Not USE I NORMAL 34 Not USE I NORMAL 35 Not USE I NORMAL 36 Not USE I NORMAL 37 Not USE I NORMAL 38 AVSS GND 39 LPR TX O 40 CONT I 41 LPR CLK O 42 LPR RESET O 43 ACK RX I 44 ACK TX O 45...

Page 18: ...XD I 64 BBIC_TXD O 65 LCD CNT0 O NORMAL RESET 66 LCD CNT1 O 67 LCD CNT2 O NORMAL WRITE 68 LCD CNT3 O NORMAL CHIP SELECT 69 LCD DAT4 O 70 LCD DAT5 O 71 LCD DAT6 O 72 LCD DAT7 O 73 VSS GND 74 EEPOROM_CS...

Page 19: ...14 32 768kHz IN I 15 KEY OUT5 O STROBE ON 16 KEY OUT4 O STROBE ON 17 KEY OUT3 O STROBE ON 18 KEY OUT2 O STROBE ON 19 KEY OUT1 O STROBE ON 20 KEY OUT0 O STROBE ON 21 KEY IN1 I KEY ON 22 KEY IN2 I KEY O...

Page 20: ...34 CHARGE I ON OFF...

Page 21: ...OFF ON 50 F3_LED_R O OFF ON 51 F3_LED_G O OFF ON 52 F2_LED_R O OFF ON 53 F2_LED_G O OFF ON 54 F1_LED_R O OFF ON 55 F1_LED_G O OFF ON 56 VSS GND 57 CHARGE_LED_R O OFF ON 58 CHARGE_LED_G O OFF ON 59 BB...

Page 22: ...Pin Description I O High High Z Low 75 EEPROM_SCK O 76 EEPROM_SI O 77 EEPROM_SO I 78 EXT_TXD O 79 EXT_RXD I 80 EXT_CLK I 6 3 RF UNIT IC501 PRL...

Page 23: ...6 4 RF UNIT FREQUENCY TABLE...

Page 24: ...nit is supplied from IC251 and Q261 The Power for the Analog Circuit is supplied from Q101 The Power for the Main Board Reset and Power Down Circuit are supplied from IC110 7 1 2 BELL DETECTOR CIRCUIT...

Page 25: ...urrent flows through Q100 Q108 R180 The pulse signal is generated when the IC105 41 is repeatedly turned ON OFF 7 1 4 RECEIVED VOICE SIGNAL PATH The analog input signal from the telephone line is chan...

Page 26: ...l is output from the IC105 23 and sent to the line 7 1 7 LINK MODE AND HOOK Normally the line mute is controlled by LPR IC105 When wearing the headset it is controlled by CPU IC107 in the auto answer...

Page 27: ...T FUNCTION The data communication circuit serves the following function in the EMSS mode Information exchanger between the EMSS and Base Unit key input information as well as data for the LED control...

Page 28: ...Reception The data from the EMSS is received via the H and L line along the path shown below H L Line D104 T100 R114 Q106 IC104 6 IC105 37 2 Transmission The data to the Base Unit is transmitted along...

Page 29: ...voltage is 3 0V 8 1 2 RINGER CIRCUIT When the Ring signal is received with the power switch of the handset ON the ringer is activated When the ring signal is received IC307 45 and IC307 46 are set Hig...

Page 30: ...is changed to a digital signal And sent to the Base Unit 8 1 5 RESET CIRCUIT The IC304 monitors the battery voltage It becomes High when the battery voltage is over 3 2V Setting the Power SW SW300 to...

Page 31: ...HG CONT L CHARGE STOP 9 CIRCUIT OPERATION CHARGER IC602 amplifies the terminal voltages of R631 to R634 generated by the charge current about 10 times then supplies them to IC601 5 IC601 controls the...

Page 32: ...10 TROUBLESHOOTING GUIDE 10 1 NO VOICE RECEPTION 10 2 NO VOICE TRANSMISSION...

Page 33: ...10 3 NO LINK BASE UNIT...

Page 34: ...F DIAGNOSIS ERROR BASE UNIT If you see the blinking of Power LED red in intervals of 1 second when you connect the AC adaptor to Base Unit Self Diagnosis error is detected by CPU The errors are occurr...

Page 35: ...error 10 6 SELF DIAGNOSIS ERROR HANDSET If you see the need repair X X means ldigit NO on LCD display of Handset when you turn on the Power Switch Self Diagnosis error is detected by CPU The errors a...

Page 36: ...u 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 IC s even though l...

Page 37: ...all of the IC lead can not been seen at the standard degree fill with large quantities of solder Note If you do not fill with solder and directly cut the IC lead with the cutter stress may build up d...

Page 38: ...PROCEDURE 1 Temporary fix FLAT PACKAGE IC by soldering on two marked pins Check the accuracy of the IC setting with the corresponding soldering foil 2 Apply flux for all pins of FLAT PACKAGE IC 3 Sol...

Page 39: ...12 CABINET AND ELECTRICAL PARTS LOCATION 12 1 BASE UNIT...

Page 40: ...12 2 HANDSET...

Page 41: ...12 3 CHARGER...

Page 42: ...13 ACCESSORIES AND PACKING MATERIALS...

Page 43: ...arking 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...

Page 44: ...y differ from production parts 4 RESISTORS CAPACITORS Unless otherwise specified All resistors are in ohms K 1000 M 1000k All capacitors are in MICRO FARADS F P F Type Wattage of Resistor 14 1 BASE UN...

Page 45: ...I Q105 2SB1218A TRANSISTOR SI Q106 2SC4116 TRANSISTOR SI S Q107 PQVT2N6517CA TRANSISTOR SI S Q108 2SC2120 TRANSISTOR SI S Q109 2SC4116 TRANSISTOR SI S Q115 2SD1819A TRANSISTOR SI Q117 B1GDCFGA0008 TRA...

Page 46: ...CAPACITORS...

Page 47: ...0 1 C126 ECUV1H330JCV 33p C127 PQCUV1C104ZF 0 1 S C128 ECUV1H330JCV 33p C129 ECUV1H330JCV 33p C130 ECUV1H330JCV 33p C131 ECUV1C104KBV 0 1 C132 ECUV1H330JCV 33p C141 ECUV1H472KBV 0 0047 C143 PQCUV1C10...

Page 48: ...4 ECUV1A105ZFV 1 S C205 ECUV1A105ZFV 1 S C212 ECUV1H470JCV 47p C215 PQCUV1C104ZF 0 1 S C216 ECUV1H470JCV 47p C217 ECUV1H470JCV 47p C219 ECUV1H470JCV 47p C220 ECUV1H470JCV 47p C223 PQCUV1C104ZF 0 1 S C...

Page 49: ...J3GEYJ103 10k R152 ERJ3GEYJ224 220k R153 ERJ3GEYJ472 4 7k R154 ERJ3GEYJ105 1M R159 ERJ3GEYJ100 10 R160 ERJ3GEYJ105 1M R161 ERDS2TJ122 1 2k S R165 ERJ3GEYJ102 1k R166 ERJ3GEYJ104 100k R168 ERJ3GEYJ101...

Page 50: ...ERJ3GEY0R00 0 R270 ERJ3GEYJ104 100k R271 ERJ3GEYJ104 100k COILS L100 PQLE106 COIL S L101 PQLE106 COIL S L102 PQLQXF330K COIL S L103 PQLQXF330K COIL S L104 G1D330000001 COIL VARISTORS SA100 PQVDDSS301L...

Page 51: ...ECUV1H220JCV 22p C510 ECUV1H101JCV 100p C511 ECUV1H220JCV 22p C512 ECUV1H223KBV 0 022 S C513 PQCUV1C104ZF 0 1 S C514 ECUV1H220JCV 22p C515 PQCUV1C104ZF 0 1 S C516 ECUV1H101JCV 100p C517 ECUV1H680JCV...

Page 52: ...1 PSYM1031Z1 CABINET FRONT S 102 PSGV1003Z COVER FOR TEL CARD 103 PSGD1058Y CARD TEL 104 PSGP1064Y1 PANEL LCD S 105 PSHE1105Z SPACER FOR PANEL LCD 106 N1CA9GA00002 ANTENNA 107 PSHE1104Z SPACER FOR LCD...

Page 53: ...ORS Q300 2SB1218A TRANSISTOR SI Q301 2SC4617R TRANSISTOR SI S Q302 UN5216 TRANSISTOR SI Q304 UN5213 TRANSISTOR SI S Q305 B1GBHBEA0003 TRANSISTOR SI Q306 B1ADNF000001 TRANSISTOR SI Q307 PQVTFB1L2Q TRAN...

Page 54: ...K1MN20B00072 CONNECTOR 20P S CN302 K1KA20A00138 CONNECTOR 20P S CN303 PSJS04A62Z CONNECTOR 4P S JK300 PQJJ1J007Z JACK S CAPACITORS C301 ECUV1H330JCV 33p C302 ECUV1H330JCV 33p C303 PQCUV1C104ZF 0 1 S...

Page 55: ...70JCV 47p C364 ECUV1H470JCV 47p C366 ECUV1H470JCV 47p C367 ECUV1H470JCV 47p C368 ECUV1H470JCV 47p C369 PQCUV1C104ZF 0 1 S C370 ERJ3GEY0R00 0 RESISTOR C372 ECUV1H470JCV 47p C373 ECUV1H470JCV 47p C374 E...

Page 56: ...R342 ERJ3GEYJ224 220k R345 ERJ3GEYJ473 47k R346 ERJ3GEYJ822 8 2k R348 ERJ3GEYJ104 100k R349 ERJ3GEYJ104 100k R351 ERJ3GEYJ272 2 7k R352 ERJ3GEYJ105 1M R353 ERJ3GEYJ560 56 R354 ERJ3GEYJ331 330 R356 ERJ...

Page 57: ...JT302 PQJT10090Z BATTERY TERMINAL S SWITCH SW300 ESD165206 SWITCH THERMISTOR TH300 PQRTD0KHJ154 THERMISTOR S VARIABLE RESISTORS VR300 EVM1YSX50B14 SEMI FIXED RESISTOR VR301 EVM1YSX50B54 SEMI FIXED RE...

Page 58: ...H220JCV 22p C515 PQCUV1C104ZF 0 1 S C516 ECUV1H101JCV 100p C517 ECUV1H680JCV 68p C518 ECUV1H120JCV 12p C519 ECUV1H220JCV 22p C520 PQCUV1C104ZF 0 1 S C521 ECST0JY226 22 C522 ECUV1H101JCV 100p C524 ECUV...

Page 59: ...ER TRANSFORMER T501 J2GE00000008 TRANSFORMER CRYSTAL OSCILLATOR X501 H0J240500009 CRYSTAL OSCILLATOR 14 3 CHARGER 14 3 1 CABINET AND ELECTRICAL PARTS Ref No Part No Part Name Description Remarks 201 P...

Page 60: ...2J 0 001 S RESISTORS R601 ERJ3GEYJ1R0 1 Ref No Part No Part Name Description Remarks R602 ERJ3GEYJ1R0 1 R603 ERJ3GEYJ1R0 1 R631 ERJ6ENF1R00 1 S R632 ERJ6ENF1R00 1 S R633 ERJ6ENF1R00 1 S R634 ERJ6ENF1R...

Page 61: ...FT BOX P2 PSPN1124Z ACCESSORY BOX P3 PSPD1147Z CUSHION P4 PQPH89Y PROTECTION COVER FOR BASE UNIT P5 XZB10X25A04 PROTECTION COVER FOR HANDSET P6 XZB15X25A04 PROTECTION COVER FOR CHARGER P7 XZB10X25A02...

Page 62: ...17 2 BASE UNIT RF 17 3 HANDSET MAIN 17 3 1 CONPONENT VIEW 17 3 2 BOTTOM VIEW 17 4 HANDSET RF 17 5 CHARGER BOARD A KXTD7895...

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