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Toshiba FT-3808BK Service Manual

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Teléfonos
Precauciones de seguridad
Controles de operación
FT-3808BK
Procedimiento de ajuste
Diagramas a bloques
Diagramas esquemáticos
Consejos para localización de fallas
Tablas de frecuencias
Tablas de voltajes en transistores e ICs
Identificación de terminales en semiconductores
Localización de partes eléctricas
Diagramas de alambrado
Vistas explotadas y lista de partes eléctricas
Lista de componentes
Lista de partes de empaque
Especificaciones

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Summary of Contents for Toshiba FT-3808BK

  • Page 1 Teléfonos Precauciones de seguridad Controles de operación FT-3808BK Procedimiento de ajuste Diagramas a bloques Diagramas esquemáticos Consejos para localización de fallas Tablas de frecuencias Tablas de voltajes en transistores e ICs Identificación de terminales en semiconductores Localización de partes eléctricas Diagramas de alambrado Vistas explotadas y lista de partes eléctricas...
  • Page 2 FILE NO. 2B0-9805 SERVICE MANUAL CORDLESS TELEPHONE FT-3808BK PRINTED IN CHINA, JUNE,1999...

  • Page 3: Table Of Contents

    SPECIFICATIONS ---------------------------------------------------------------------------------5 5 SAFETY PRECAUTIONS Before returning any TOSHIBA FT-3808BK to the customer, a safety check of the entire instrument should be made. The service technician must be sure that no protective device built into the instrument by the manufacturer has become defective or inadvertently degraded during servicing.

  • Page 4: Operating Controls

    OPERATING CONTROLS MAIN FEATURES ON HANDSET 1. Helical Antenna - Durable high -gain helical antenna. 2. TALK / FLASH Key & Indicator - Places the handset into talk mode when used away from the base unit/Access Services such as Call Waiting and Call Forwarding . The indicator lights when the handset is in talk mode. 3.
  • Page 5 DC 9V TEL.LINE REAR SIDE OF BASE UNIT BACK SIDE OF BASE UNIT SPEED DIAL INDEX MAIN FEATURES ON BASE UNIT 1. Phone Cord Jack -Plugs one end of the telephone line cord into standard RJ11C telephone line jack and the other end into this jack for connecting the base unit to the telephone line.

  • Page 6: Alignment Procedure

    ALIGNMENT PROCEDURE Perform the alignment of the Handset & Base using the test mode described below: 1. Test mode for Handset unit: 1.1 Connecting the 3.6VDC power supply to the battery contact. 1.2 Pressing the “#” and “3” keys at the same time, both “IN_USE LED” and “LOW_ BATT LED”...
  • Page 7 3. Handset unit : 3.1 Test equipment required and connection. Digital Voltmeter RX -Loop-V TX-Loop-V RX-Audio Audio MIC IN / Handset unit Generator RX Audio (RF & Audio Board) VTVM TX Audio / REC + Batt. Frequency 3.6V Counter 3.2 Preparation from alignment Place the H/S Board into test mode, disconnect microphone wire at H/S Board and set the volume to “L”...
  • Page 10 4. Base unit : 4.1 Test Equipment required and connection. AC Power supply : 120V 50Hz Digital Voltmeter RX -Loop-V TX-Loop-V RX-Audio Audio Quad-Tune / Base unit Pin3 of BT1/ Generator Pin3 of BT1 (RF & Audio Board) Tx Audio VTVM TX Audio / REC + 9V DC IN...

  • Page 13: Block Diagram

    B L O C K D I A G R A M Base Unit Audio Block Diagram Tx Filter Summing Amp Tx Mute Tx-Audio C o m p r e s s o r Speech Network Rx Mute Expandor Rx-Audio Pre-amp Tx Filter TA31103F...
  • Page 14 RF module Block Diagram SAW FILTER 2 POLE CERAMIC Ist Rx AMP 2nd Rx AMP MIXER IF AMP 10,7 MHz CERAMIC 10.7MHz CERAMIC V-Tune Rx-AUDIO Rx L.O. RX DATA TX L.O. 2 POLE CERAMIC V-Tune RSSI DUAL PRESCALER SYNTHESIZER 1 GHz LOW PASS TX O.P AMP V-Tune...

  • Page 17: Troubleshooting Hints

    TROUBLESHOOTING HINTS 1. The bell does not ring. When the PAGE SW of the See 2, The bell does not ring base is pressed, does the ringer & page does not ring. on the handset ring? When the TEL SG is joined By using voltmeter check with the base to made bell BU8 is defective.
  • Page 18 2. The bell does not ring & page does not ring. Can the base and Check whether the base & By using voltmeter, check the base & handset be connected. handset RX and TX-Loop-V handset PLL circuit (B/HU2 and are OK. surrounding circuit of B/HU2) By using voltmeter, check Check the base TX Power...
  • Page 19 3. The Base and handset can’t connect. Check whether the Check whether the handset By using voltmeter, check the base & handset and the base and the base RX, TX-Loop- handset PLL circuit (B/HU2 and unit are connected. are OK. surrounding circuit of B/HU2) By using voltmeter, check Check the base TX Power...
  • Page 20 4. Can’t make a phone call (pulse) Can the base and handset be See 3, the base and handset connected ? can’t connect. By using voltmeter, check While in Talk Mode press base BU7. dial key of the handset, can pulse feedback be heard from the handset receiver.
  • Page 21 6.Voice can’t be transmitted to other party. At the MIC of the handset, Check the handset MIC does the bias voltage exist. sensitivity. Check the handset TX AF Check the base RX TEL- circuit (around PIN1-11 of Line out. HU7 and HU5C). Check the base RX RF Check the base RX circuit and mixer circuit...
  • Page 22 7. The voice of the caller can’t be heard (incoming call). Check the RX IF circuit ( HU1 and surrounding circuit Check the handset receiver of HU1 ) and RX AF circuit ( HU7 and surrounding output. circuit of HU7 ) Check the handset RX RF Check the handset RX Receiver of handset is...

  • Page 23: Frequency Chart

    FREQUENCY CHART Channel NO. Handset TX Handset RX RX LO RX LO Base RX Base TX Handset Base 925.05 902.3 913.0 914.35 925.35 902.6 913.3 914.65 925.65 902.9 913.6 914.95 925.95 903.2 913.9 915.25 926.25 903.5 914.2 915.55 926.55 903.8 914.5 915.85 926.85...

  • Page 24: Ic And Transistor Voltage Chart

    IC AND TRANSISTOR VOLTAGE CHART HANDSET UNIT UNIT: V HU1 (MC13156) HU2 (TB31202FN) HU3( LSC442349DW) Standby Talk Standby Talk Standby Talk 1.65 2.06 3.00 3.00 2.80 2.78 2.98 3.00 2.49 2.78 2.52 2.48 3.03 1.81 3.02 3.02 2.84 3.02 3.02 2.49 1.63 3.02...
  • Page 25 HU5(LM324D) HU7(TA31103F) HU11 (LP29531MX) Standby Talk Standby Talk Standby Talk 1.26 3.02 0.52 1.21 1.01 1.02 1.11 3.03 3.04 3.03 3.03 1.08 1.15 1.17 1.28 1.36 1.36 1.22 1.22 1.27 3.00 3.01 1.77 0.84 0.08 0.64 1.09 1.27 1.09 1.28 1.08 1.36 2.98...
  • Page 26 HQ1(2SC4083) HQ2(2SC4227) HQ4(2SC4226) Standby Talk Standby Talk Standby Talk 2.36 2.54 2.37 0.78 0.79 0.76 HQ5 (MMBT3904) HQ6(MMBT3904) HQ7(CF739R) Standby Talk Standby Talk Standb Talk 1.93 2.88 0.64 1.99 1.34 1.09 2.88 HQ8(2SC4083) HQ9(2SC4083) HQ10(2SC4083) Standby Talk Standby Talk Standby Talk 2.81 2.76...
  • Page 27 BASE UNIT UNIT: V BU1(MC13156DW) BU2 (TB31202FN) BU3 (LSC442483DN) Standby Talk Standby Talk Standby Talk 4.99 5.01 4.23 4.26 5.02 5.04 4.99 5.01 4.96 4.98 5.07 5.09 3.89 3.91 2.36 5.05 5.07 5.00 5.01 4.68 4.71 4.68 4.71 5.06 5.08 4.68 4.71 3.94...
  • Page 28 BU5(LM324D) BU6 (TA31103F) BU7 (PS2532) Standby Talk Standby Talk Standby Talk 1.31 1.34 1.36 1.39 5.08 1.45 1.33 1.35 1.30 1.33 5.07 0.32 1.22 1.24 1.35 1.37 5.07 5.09 1.41 0.57 0.59 1.32 1.35 0.57 0.59 1.31 1.33 BU8 (LTV817) 0.57 0.59 0.62...
  • Page 29 BQ1(2SC4083) BQ2(2SC4427) BQ3(MMBT3904) Standby Talk Standby Talk Standby Talk 4.03 4.40 4.42 0.14 0.17 0.84 0.83 0.85 0.67 0.69 BQ4(2SC4426) BQ5(MMBT3904) BQ6(MMBT3904) Standby Talk Standby Talk Standby Talk 3.79 3.81 3.30 3.31 5.07 5.09 0.82 0.71 0.73 2.92 2.95 2.26 2.28 BQ7(CF739R) BQ8(2SC4083)

  • Page 30: Semiconductor Lead Identification

    S E M I C O N D U C T O R L E A D I D E N T I F I C A T I O N H a n d s e t U n i t :MMBT3904 B : B a s e :MMBT3906...
  • Page 31 B a s e U n i t :MMBT3904 B : B a s e :MMBT3906 E : E m i t t e r :2SC4083 C : C o l l e c t o r :2SC4227 :2SC4226 BD1: HVH202 BU9:78M05CT BD8:V300LA4 BQ7:CF739R...

  • Page 32: Electrical Parts Location

    ELECTRICAL PARTS LOCATION HANDSET PCB...
  • Page 37 MECHANICAL PART LIST Handset Unit: LOC NO PART NO REF NO DESCRIPTION RC007144 30-4793-00-00 BATTERY DOOR RC007279 30-4792-01-00 CASE REAR RC006930 92-5005-10-01 POP STICKER LBL RC007855 29-4003-01-02 BATT ASSY NII-CD 3X1.2V RC007171 92-5122-20-00 HS SERIAL NO LABEL RC007282 39-4142-00-00 BUZZER COVER RC007268 30-4306-01-00 HOLE COVER...
  • Page 39 MECHANICAL PART LIST Base Unit: LOC NO PART NO REF NO DESCRIPTION RC007139 30-4797-00-00 BATTERY DOOR RC007151 32-4260-10-00 TEL NO SHEET RC007855 29-4003-01-02 BATT ASSY NI-CD 3X1.2V RC007172 92-5010-30-00 BS SERIAL NO LABEL RC007158 30-4558-00-00 ANT CAP-1 RC007270 30-4727-00-00 ANT BODY RC007160 46-1091-01-00 ANT CABLE...

  • Page 40: Component List

    COMPONENT LIST PRODUCT SAFETY NOTE: Products marked with a ! have special characteristics important to safety. Before replacing any of these components, read carefully the product safety notice of this service manual. HANDSET: LOC NO PART NO REF NO DESCRIPTION RC007176 20-3067-13-00 X'TR RF/NPN SOT323 RL 2SC4083...
  • Page 41 LOC NO PART NO REF NO DESCRIPTION HC11 RC006277 22-3399-20-G6 CAP CER 3.9PF 50V 0.25PF HC12 RC006275 22-3339-20-G6 CAP CER 3.3PF 50V +/-0.25PF HC13 RC006280 22-3470-25-G6 CAP CER RL 47PF 50V 5% HC14 RC006280 22-3470-25-G6 CAP CER RL 47PF 50V 5% HC15 RC006274 22-3279-20-G6 CAP CER 2.7PF 50V +/-0.25PF...
  • Page 42 LOC NO PART NO REF NO DESCRIPTION HC62 RC006267 22-3209-29-G6 CAP CER 2P 50V +/- 0.25P COG HC63 RC006280 22-3470-25-G6 CAP CER RL 47 PF 50V 5% HC64 RC006280 22-3470-25-G6 CAP CER RL 47 PF 50V 5% HC65 RC006263 22-3151-25-G6 CAP CER RL 150 PF 50V 5% HC66 RC006286 22-3689-20-G6 CAP CER 6.8PF 50V +/- 0.25PF...
  • Page 43 LOC NO PART NO REF NO DESCRIPTION HC116 RC006391 22-3223-16-G5 CAP CER RL 22UF 25V 10% HC117 RC006391 22-3223-16-G5 CAP CER RL 22UF 25V 10% HC118 RC006258 22-3102-26-G5 CAP CER 1000PF 50V +/-10% HC119 RC006256 22-2106-01-33 CAP TANT 10UF 6V 20% HC121 RC006393 22-3473-06-G5 CAP CER RL 47NF 16V 10%...
  • Page 44 LOC NO PART NO REF NO DESCRIPTION HR23 RC006292 23-0104-86-21 RES CR SMD REEL 100K 1/16W 5% HR24 RC006397 23-0224-86-21 RES CR SMD REEL 220K 1/16W 5% HR25 RC006557 23-0510-86-21 RES CR SMD REEL 51 1/16W 5% HR26 RC006292 23-0104-86-21 RES CR SMD REEL 100K 1/16W 5% HR27 RC006291...
  • Page 45 LOC NO PART NO REF NO DESCRIPTION HR74 RC006292 23-0104-86-21 RES CR SMD REEL 100K 1/16W 5% HR75 RC006292 23-0104-86-21 RES CR SMD REEL 100K 1/16W 5% HR76 RC006317 23-0561-86-21 RES CR SMD 560 ohm 1/16W 5% HR77 RC006296 23-0153-86-21 RES CR SMD REEL 15K 1/16W 5% HR78 RC006289...
  • Page 46 LOC NO PART NO REF NO DESCRIPTION HR122 RC006290 23-0102-86-21 RES CR SMD REEL 1K 1/16W 5% HR123 RC006314 23-0474-86-21 RES CF SMD RL 470K 1/16W 5% HR124 RC006296 23-0153-86-21 RES CR SMD REEL 15K 1/16W 5% HR125 RC006314 23-0474-86-21 RES CF SMD RL 470K 1/16W 5% HR126 RC006288...
  • Page 47 BASE: LOC NO PART NO REF NO DESCRIPTION RC007176 20-3067-13-00 X’TR, RF/NPN, SOT323, RL, 2SC4083. RC007177 20-3066-03-00 X’TR, RF/NPN, SOT323, RL, 2SC4227. RC005765 20-0041-01-00 X’TR, MMBT3904LT1, SOT-23,REEL RC007200 20-3018-03-04 X’TR, NE2SC4226, R25-T1 RC005765 20-0041-01-00 X’TR, MMBT3904LT1, SOT-23,REEL RC005765 20-0041-01-00 X’TR, MMBT3904LT1, SOT-23,REEL RC005771 20-4012-00-00 X’TR, MOSFET CF739R...
  • Page 48 LOC NO PART NO REF NO DESCRIPTION RC006287 22-3759-20-G6 CAP CER 7.5PF 50V + 0.25PF RC006277 22-3399-20-G6 CAP CER 3.9PF 50V, 0.25PF RC006286 22-3689-20-G6 CAP CER 6.8PF 50V + 0.25PF RC006274 22-3279-20-G6 CAP CER 2.7PF 50V + 0.25PF RC006283 22-3479-20-G6 CAP CER 4.7PF 50V + 0.25PF RC006283...
  • Page 49 LOC NO PART NO REF NO DESCRIPTION BC42 RC006260 22-3104-16-M3 CAP CER 0.1µF 25V BC43 RC006259 22-3103-26-G5 CAP CER 0.01µF 50V + 10% BC44 RC006259 22-3103-26-G5 CAP CER 0.01µF 50V + 10% BC45 RC006259 22-3103-26-G5 CAP CER 0.01µF 50V + 10% BC46 RC006259 22-3103-26-G5...
  • Page 50 LOC NO PART NO REF NO DESCRIPTION BC87 RC006287 22-3759-20-G6 CAP CER 7.5PF 50V + 0.25PF BC89 RC006392 22-3272-26-G5 CAP CER 2.7NF 50V 10% BC90 RC006263 22-3151-25-G6 CAP CER RL 150PF 50V 5% BC91 RC006273 22-3270-25-G6 CAP CER RL 27PF 50V 5% BC93 RC006287 22-3759-20-G6...
  • Page 51 LOC NO PART NO REF NO DESCRIPTION BC133 RC006877 22-1100-61-U4 CAP CER 10µ 50V 20% BC134 RC006192 22-1229-61-U4 CAP CER 2.2µ F 50V 20% BC135 RC007184 22-3104-27-J9 CAP CER 0.1µ 50V 2% BC136 RC007185 22-3223-17-X3 CAP CER 0.022µF 25V 20% ST5 BC137 RC006802 22-1470-21-03...
  • Page 52 LOC NO PART NO REF NO DESCRIPTION BR21 RC006307 23-0331-86-21 RES SMD RL 330 OHM 1/16W 5% BR22 RC006312 23-0471-86-21 RES CR SMD REEL 470 1/16W 5% BR24 RC006292 23-0104-86-21 RES CR SMD REEL 100K 1/16W 5% BR25 RC006040 23-0331-82-10 RES SMD RL 330 OHM 0.1W 5% BR26 RC006292...
  • Page 53 LOC NO PART NO REF NO DESCRIPTION BR65 RC006314 23-0474-86-21 RES CF SMD RL 470K 1/16W 5% BR66 RC006313 23-0472-86-21 RES SMD RL 4.7K 1/16W 5% BR67 RC006291 23-0103-86-21 RES CR SMD REEL 10K 1/16W 5% BR68 RC006291 23-0103-86-21 RES CR SMD REEL 10K 1/16W 5% BR69 RC007191 23-6812-84-10...
  • Page 54 LOC NO PART NO REF NO DESCRIPTION BR109 RC006447 23-0184-86-21 RES CR 0603 RL 180K 1/16W 5% BR110 RC006447 23-0184-86-21 RES CR 0603 RL 180K 1/16W 5% BR111 RC006447 23-0184-86-21 RES CR 0603 RL 180K 1/16W 5% BR112 RC006319 23-0823-86-21 RES CR 0603 REEL 82K 1/16W 5% BR113 RC006602...
  • Page 55 LOC NO PART NO REF NO DESCRIPTION BR155 RC006526 23-0223-86-21 RES CR SMD REEL 22K 1/16W 5% BR157 RC006288 23-0000-86-21 RES CR SMD REEL 0 1/16W 5% BSR1 RC006804 23-0022-11-01 RES,CF,AXL,RL,200 OHM,1/8W,5% BSR63 RC005862 23-0472-11-01 RES,CF,AXL,RL,4.7K OHM,1/8W,5% BSR69 RC005862 23-0472-11-01 RES,CF,AXL,RL,4.7K OHM,1/8W,5% BSR70 RC005862...

  • Page 56: Packing Parts List

    RC007295 92-4007-00-00 LBL,BARCODE, SIZE 23X10MM.PAPER RC007050 92-4211-10-00 TOOL FREE LBL TOSH. SX-2007, R.0 RC006930 92-5005-10-01 POP STICKER LBL, TOSHIBA ADL R.1 RC007284 92-5010-30-00 B/S S/N LBL FT3808 R.0 RC007285 92-5121-20-00 GIF BARCODE LBL FT3808 R.0 RC007286 92-5120-20-00 CARTON BARCODE LBL FT3808 R.0 RC007287 92-5122-20-00 H/S S/N LBL FT-3808 R.0...

  • Page 57: Specifications

    SPECIFICATIONS Measurement Conditions Standard Voltage Handset DC 3.6V + 0.1V Base AC 120V + 3V, 60Hz Temperature 77ºF (25ºC) + 9ºF (5ºC) Channel Handset (Tx Base (Tx Freq.) Freq.) 925.05 MHz 902.3 MHz 925.35 MHz 902.6 MHz 925.65 MHz 902.9 MHz 925.95 MHz 903.2 MHz 926.25 MHz...
  • Page 58 Telephone Dial Unit Unit Nominal Limit Pulse Dialing a. Dialing Rate 8-11 b. Break Ratio 54-68 Tone Dialing a. Frequency Row1 +1.5% Row2 +1.5% Row3 +1.5% Row4 +1.5% Column1 1209 +1.5% Column2 1336 +1.5% Column3 1477 +1.5% b. Minimum Level on Single Tone Low Group High Group c.
  • Page 59 Transmitter Unit Nominal Limit µ Transmit Power 90-94 Output Frequency Range 925.05 - 927.75 Channel Spacing <50 Radiated Field Strength mV/m, @ 3 m Antenna Polarization Vertical Transmitter Frequency Stability, 0≡C to 50≡C Modulation Method Frequency Deviation KHz p-p Modulation Data Rate kbps Power Drain Unit...
  • Page 60 TOSHIBA AMERICA CONSUMER PRODUCTS, INC. 82 TOTOWA ROAD, WAYNE, N.J. 07470 TOSHIBA HAWAII, INC. 327 KAMAKEE ST., HONOLULU, H.I. 96814...

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