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Toshiba FT-8939 Service Manual

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Teléfonos inalámbricos
Contenido y precauciones de seguridad
Controles de operación
FT-8939
Procedimientos de alineamiento
Diagrama a bloques
Diagramas esquemáticos
Procedimiento de localización de fallas
Carta de voltajes de transistores y de IC
Identificación de terminales de semiconductores
Localización de partes eléctricas
Diagramas de conexiones (alambrado)
Vistas explotadas y lista de partes mecánicas
Lista de partes
Lista de partes del ensamble
Especificaciones

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Summary of Contents for Toshiba FT-8939

  • Page 1 Teléfonos inalámbricos Contenido y precauciones de seguridad Controles de operación FT-8939 Procedimientos de alineamiento Diagrama a bloques Diagramas esquemáticos Procedimiento de localización de fallas Carta de voltajes de transistores y de IC Identificación de terminales de semiconductores Localización de partes eléctricas Diagramas de conexiones (alambrado) Vistas explotadas y lista de partes mecánicas...
  • Page 2 FILE NO. 2B0-9904 SERVICE MANUAL CORDLESS TELEPHONE FT-8939 PUBLISHED IN JAPAN, Sep., 1999...

  • Page 3: Table Of Contents

    CONTENTS SAFETY PRECAUTIONS ......................1 OPERATING CONTROLS ......................2 ALIGNMENT PROCEDURE ......................3 BLOCK DIAGRAMS ........................9 SCHEMATIC DIAGRAMS ......................12 TROUBLESHOOTING HINTS ....................18 IC AND TRANSISTOR VOLTAGE CHART ................25 SEMICONDUCTOR LEAD IDENTIFICATION ................31 ELECTRICAL PARTS LOCATION ..................... 34 WIRING DIAGRAMS .........................

  • Page 4: Operating Controls

    OPERATING CONTROLS HANDSET CONTROLS AND FUNCTIONS Antenna TALK/BATT.LOW LED REDIAL Button FLASH Button TALK Button Dialpad (0~9, ∗ and # buttons) TONE Button VOL/RING Button MEM (Memory) Button PAUSE Buttons CH Button One-touch dialing Button MUTE Button ( MEM1 - MEM3 ) Rechargeable Battery Pack Charging Contacts (back)

  • Page 5: Alignment Procedure

    ALIGNMENT PROCEDURE Test Mode For Base Unit Press the “PAGE” key about 3.0 seconds while turning the power on. 1. To change the TEST mode: Press the “PAGE” key with T/P switch to PULSE position. 2. To change channel: Press the “PAGE” key with T/P switch to TONE position. If changing the step, the channel returns to the start channel.
  • Page 6 Test Mode For Handset Unit To Perform the TEST mode, turn the power ON by pressing the “ ” and “#” buttons at the same time. When entered the TEST mode, the bell rings and the unit enters TEST mode 1. (Refer to the follwing table.) 1.

  • Page 7: Base Unit

    Base Unit Transmitter Section BASE Unit AF GEN. Test Point Power Connections Meter DC IN TEL Line 1kHz 77.5mV 9V Jack Jack Test Point Frequency Counter AC 120V Adapter 60Hz Deviation Mater Preset Place the Base Unit in VCO/TX FREQ.ADJ mode in accordance with the procedure on page 3. Alignment Procedure step Adjustment...
  • Page 8 Receiver Section Connections BASE Unit AC Voltmeter RF SG Dummy Load (600-ohm) TEL Line Test Point Jack DC Voltmeter DC IN 9V Jack Test Point AC 120V 60Hz Adapter Preset Place the Base Unit in RX SENS mode (step 4) in accordance with the precedure on page 3. Alignment Procedure step Preset to...
  • Page 9 Handset Unit Transmitter Section Connection HANDSET Unit AF GEN. Test Point Power Meter J401 Battery 1kHz 9mV MIC+Pin Connector Test Point Frequency Counter DC Power Supply Deviation Mater DC 3.8V Preset Place the Handset in VCO/TX FREQ. ADJ mode in accordance with the procedure on page 4. Alignment Procedure step Adjustment...
  • Page 10 Receiver Section Connections HANDSET Unit AC Voltmeter RF SG Dummy Load (150-ohm) Test Point Terminal DC Power Supply J603 DC Voltmeter Battery Test Point Connector DC 3.8V Preset Place the Handset in RX SENS mode (step 4) in accordance with the procedure on page 4. Alignment Procedure step Preset to...

  • Page 11: Block Diagrams

    BLOCK DIAGRAMS Base Unit, Main...
  • Page 12 Base Unit, DSP...
  • Page 13 Handset...

  • Page 14: Schematic Diagrams

    SCHEMATIC DIAGRAMS Base Unit, Main...
  • Page 15 Base Unit, Key...
  • Page 16 Handset...

  • Page 17: Troubleshooting Hints

    TROUBLESHOOTING HINTS 1. The bell does not ring. See 2. The bell does not ring When the PAGE SW of the & page does not ring. base is pressed, does the ringer on the handset ring? When the TEL SG is joined Check IC2 and TEL network with the base to make bell circuit.
  • Page 18 2. The bell does not ring & page does not ring. Can the base and handset be See 3. The base and handset connected? cannot be connected. Press handset DIAL key When the key of the handset is Check IC404. while in TALK MODE.
  • Page 19 3. The base and handset cannot be connected. Check whether the base Check IC11 and its is able to set in the test peripheral circuit. mode 1. Check the TX POWER Check base RF unit. and the TX FREQUENCY on the base unit. Set the base in the test Check whether there is a Check RT3, R30, R76,...
  • Page 20 Set the handset in the Check whether there is a Check RT403, R441, test mode 3, check 250 Hz data waveform at R442, R443, R444, whether deviation of the “MOD” of RF unit. R445 and C453. TX data is app. 8.5 kHz Dev.
  • Page 21 4. Cannot make a phone call (pulse). Can the base and handset See 3. The base and handset be connected? cannot be connected. While in TALK MODE, press Check IC11. dial key of the handset. Check whether square waveform from pin 13 of IC11 is fed.

  • Page 22: Voice Cannot Be Transmitted To Other Party (Outgoing Call)

    6. Voice cannot be transmitted to other party (outgoing call). Can the base and handset be See 3. The base and handset connected? cannot be connected. The 1 kHz, 9.0mV sine Check Q404 and its wavefor m i s a p p l i e d t o peripheral circuit.
  • Page 23 7. The voice of the caller cannot be heard (incoming call). Can the base and handset be See 3. The base and handset connected? cannot be connected. The 1 kHz, 77.5mV sine Check the base TEL-line waveform is applied to TEL- circuit and REPLAY control line of the base, can the 1 kHz circuit.

  • Page 24: Ic And Transistor Voltage Chart

    IC AND TRANSISTOR VOLTAGE CHART Base Unit Unit[V] Unit[V] Ref. No. PIN STBY TALK NOTE Ref. No. PIN STBY TALK NOTE OPEN OPEN TEL LINE OPEN 5.0(AC) 5.0(AC) TEL LINE OPEN TEL LINE OPEN TEL LINE OPEN OPEN OPEN OPEN 3.8(AC) 3.8(AC) 5.0(AC)
  • Page 25 Unit[V] Unit[V] Ref. No. PIN STBY TALK NOTE Ref. No. PIN STBY TALK NOTE OPEN IC11 5.0(AC) 5.0(AC) OPEN OPEN 3.6(AC) 3.6(AC) 3.2(AC) 3.2(AC) OPEN 3.2(AC) OPEN IC202 OPEN IC201 OPEN OPEN OPEN OPEN IC202 OPEN...
  • Page 26 Unit[V] Unit[V] Ref. No. PIN STBY TALK NOTE Ref. No. PIN STBY TALK NOTE OPEN OPEN 3.6(AC) 3.6(AC) OPEN 3.1(AC) 3.1(AC) IC204 3.1(AC) 3.1(AC) IC207 OPEN OPEN OPEN IC202 OPEN OPEN OPEN OPEN OPEN OPEN OPEN OPEN OPEN OPEN OPEN IC208 OPEN OPEN...
  • Page 27 Unit[V] Unit[V] Ref. No. PIN STBY TALK NOTE Ref. No. PIN STBY TALK NOTE OPEN OPEN OPEN IC208 Q201 Q202...
  • Page 28 Handset Unit[V] Unit[V] Ref. No. PIN STBY TALK NOTE Ref. No. PIN STBY TALK NOTE 2.0(AC) 0-3.5 2.0(AC) OPEN OPEN IC401 0-0.3 OPEN OPEN OPEN OPEN 0-2.0 0-2.0 0-1.5 0-0.4 0-0.4 0-0.4 1.0-3.0 IC404 1.0-3.0 0-1.8 OPEN 0-3.0 IC403 0-1.0 0-3.0 OPEN 0-3.0...
  • Page 29 Unit[V] Unit[V] Ref. No. PIN STBY TALK NOTE Ref. No. PIN STBY TALK NOTE Q412 0-0.5 IC405 0-1.2 0-0.5 0-3.0 IC406 Q401 0-2.0 0-0.8 Q402 0-2.0 0-0.8 0-3.0 Q403 0-2.4 Q404 Q405 Q406 Q407 Q408 Q409 Q410 Q411...

  • Page 30: Semiconductor Lead Identification

    SEMICONDUCTOR LEAD IDENTIFICATION Base Unit D4 /D207 /D209 D201 /D208 : SML-310LT D1 /D2 /D5 /D6 /D8 /D9 D202 /D206 : SML-310MT /D213 /D217 /D218 : RLS4148 /D10 /D11 /D16 /D25 /D26 /D28 /D29 /D30 : 1N4148 D15 /D214 : HZK6C D3 : HZ7C3 D7 : HZ33CP Anode...
  • Page 31 IC7 : RH5VL40CA IC11 IC207 : RH5VL45AA MB89173PF DTMF P36 / INT2 P37 / BZ MDD0 P00 / L10 MDD1 P01 / L11 P02 / L12 P03 / L13 IC201 P04 / L14 MC34119D P50 / (X0A) P05 / L15 P51(Z1A) P06 / L16 P07 / L17...
  • Page 32 Handset D407 : HSM88WA D408 : SML-310LT D401 / D402 / D405 / D406 : RLS4148 D403 / D404 : HZK6C Anode Anode Cathode Anode Cathode Cathode Cathode Q401 : 2SC2714 Q402 / Q404 / Q405 / Q406 / Q407 / Q408 / Q409 / Q410 / Q411 / Q412 : 2SC1623 Q403 : 2SA812(M) B : Base...

  • Page 33: Electrical Parts Location

    ELECTRICAL PARTS LOCATION Base Unit Main PCB...
  • Page 34 Base Unit Key PCB...
  • Page 35 Handset Main PCB...

  • Page 36: Wiring Diagrams

    WIRING DIAGRAMS Base Unit...
  • Page 37 Handset...

  • Page 38: Exploded View And Mechanical Parts List

    EXPLODED VIEWS AND MECHANICAL PARTS LIST Base Unit SPEAKER KEY PCB MAIN PCB RF MODULE (BASE) ANTENNA...
  • Page 39 Base Unit LOC. REF. PART NO. DESCRIPTION RC008497 GNBZ342499Z BUTTON, FUNCTION RC008496 GCAS242498Z CASE, BOTTOM RC008495 GCAS142497A CASE, TOP RC008414 HTML442750Z CHARGE TERMINAL C5191(PBP) RC005608 RCUN451804Z CUSHION NEOPRENE RC005439 GCAS254442Z DISPLAY WINDOW PMMA RC002384 LFUT428079Z FOOT BUMPON SJ-5916 1.6T RC008013 RBLD459155A HIMELON RC008891...
  • Page 40 Handset RF MODULE (HANDSET) MAIN PCB ASSY...
  • Page 41 Handset LOC. REF. PART NO. DESCRIPTION RC008371 RBLD442208Z BLIND RC008368 GNBZ442524Z BUTTON, FUNCTION RC008366 GCAS342523Z CASE, FRONT RC008365 GCAS342429Z CASE, REAR RC008342 HTML442336Z CHARGE TERMINAL C2680(BSP) RC008909 GCAS458501Z COVER, ANTENNA ELASTOMER RC008908 GCAS458500Z COVER, BATTERY RC008347 RCUM441150Z CUSHION MOLTPRENE,40×20×8 RC008348 RCUN442433Z CUSHION NEOPRENE...

  • Page 42: Parts List

    PARTS 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. Don’t degrade the safety of the product through important servicing. Symbol Symbol ±...
  • Page 43 LOC. REF. PART NO. DESCRIPTION RC005202 BCML311045Z CERAMIC M/L (1608) TAPE 0.1UF 16V K B RC008318 BCML815625Z CERAMIC M/L (1608) TAPE 0.0056UF 50V K B RC005276 BCML818225Z CERAMIC M/L (1608) TAPE 0.0082UF 50V K B RC001809 BCAZ814786Z ELECTROLYTIC 0.47UF 50V M C-156 RC005206 BCML812225Z CERAMIC M/L (1608) TAPE...
  • Page 44 LOC. REF. PART NO. DESCRIPTION RC005205 BCML811035Z CERAMIC M/L (1608) TAPE 0.01UF 50V K B RC008106 BCAZ313316Z ELECTROLYTIC 330UF 16V M C-156 RC005205 BCML811035Z CERAMIC M/L (1608) TAPE 0.01UF 50V K B RC001794 BCAZ111016Z ELECTROLYTIC 100UF 10V M C-156 RC001794 BCAZ111016Z ELECTROLYTIC 100UF 10V M C-156...
  • Page 45 LOC. REF. PART NO. DESCRIPTION C216 RC008926 BCMM518214Z CERAMIC M/L (1608) TAPE 820PF 25V J CH C217 RC008270 BCML811235Z CERAMIC M/L (1608) TAPE 0.012UF 50V K B C218 RC005204 BCML811025Z CERAMIC M/L (1608) TAPE 0.001UF 50V K B C219 RC005204 BCML811025Z CERAMIC M/L (1608) TAPE 0.001UF 50V K B...
  • Page 46 LOC. REF. PART NO. DESCRIPTION C416 RC002594 BCXT516835Z CERAMIC M/L (2125) TAPE 0.068UF 25V K B C417 RC004347 BCXK514740Z CERAMIC M/L (2125) TAPE 0.47UF 25V Z F C418 RC002229 BCXT511045Z CERAMIC M/L (2125) TAPE 0.1UF 25V K B C419 RC008318 BCML815625Z CERAMIC M/L (1608) TAPE 0.0056UF 50V K B...
  • Page 47 LOC. REF. PART NO. DESCRIPTION C466 RC005207 BCML813325Z CERAMIC M/L (1608) TAPE 0.0033UF 50V K B C467 RC003284 BCFZ901016Z ELECTROLYTIC 100UF 6.3V M C-258 C468 RC005205 BCML811035Z CERAMIC M/L (1608) TAPE 0.01UF 50V K B C469 RC008296 BCSH901006Z TANTALUM CHIP TAPE 10UF 6.3V M C-122 C470 RC005203...
  • Page 48 LOC. REF. PART NO. DESCRIPTION D403 RC003195 BDAY0432004 ZENER HZK6C TR D404 RC003195 BDAY0432004 ZENER HZK6C TR D405 RC001826 BDAY0433001 RLS4148 TE11 D406 RC001826 BDAY0433001 RLS4148 TE11 D407 RC002240 BDAY0485001 HSM88WA TL D408 RC008320 BDAY1092001 SML-310LT T86 FILTERS RC008279 BFLY0971001 CERAMIC FL-971 FFE1054NA11UXL RC008280...
  • Page 49 LOC. REF. PART NO. DESCRIPTION TRANSISTORS RC002245 BDBC2714124 DB-718 2SC2714-Y TE85L RC003031 BDBC1623648 DB-380 2SC1623-L6 T1B RC003031 BDBC1623648 DB-380 2SC1623-L6 T1B RC003031 BDBC1623648 DB-380 2SC1623-L6 T1B RC008275 BDBA0812695 DB-035 2SA812(M)-M6A T1B RC008275 BDBA0812695 DB-035 2SA812(M)-M6A T1B RC003031 BDBC1623648 DB-380 2SC1623-L6 T1B RC003200 BDBD0471111 DB-411 2SD471-L...
  • Page 50 LOC. REF. PART NO. DESCRIPTION RC005241 BRFC161034Z CARBON FIXED CHIP 10K 1/16W J TAPING RC008029 BRFC163924Z CARBON FIXED CHIP 3.9K 1/16W J TAPING RC005280 BRFC161534Z CARBON FIXED CHIP 15K 1/16W J TAPING RC005260 BRFC166834Z CARBON FIXED CHIP 68K 1/16W J TAPING RC005286 BRFC165644Z CARBON FIXED CHIP...
  • Page 51 LOC. REF. PART NO. DESCRIPTION RC008734 BRFC162254Z CARBON FIXED CHIP 2.2M 1/16W J TAPING RC005241 BRFC161034Z CARBON FIXED CHIP 10K 1/16W J TAPING RC004183 BRSJ001024Z METAL OXIDE 1K 1WS J RC005280 BRFC161534Z CARBON FIXED CHIP 15K 1/16W J TAPING RC005280 BRFC161534Z CARBON FIXED CHIP 15K 1/16W J TAPING...
  • Page 52 LOC. REF. PART NO. DESCRIPTION R112 RC008481 BRFC181514Z CARBON FIXED CHIP 150 1/8W J TAPING R114 RC005281 BRFC162224Z CARBON FIXED CHIP 2.2K 1/16W J TAPING R115 RC005261 BRFC168224Z CARBON FIXED CHIP 8.2K 1/16W J TAPING R116 RC005281 BRFC162224Z CARBON FIXED CHIP 2.2K 1/16W J TAPING R117 RC005240...
  • Page 53 LOC. REF. PART NO. DESCRIPTION R203 RC003630 BRFC011094Z CARBON FIXED CHIP 1 1/10W J TAPING R205 RC005311 BRFC160004Z CARBON FIXED CHIP 0 1/16W J TAPING R206 RC002899 BRFC180004Z CARBON FIXED CHIP 0 1/8W J TAPING R207 RC005256 BRFC164724Z CARBON FIXED CHIP 4.7K 1/16W J TAPING R208 RC005257...
  • Page 54 LOC. REF. PART NO. DESCRIPTION R256 RC008091 BRFC165614Z CARBON FIXED CHIP 560 1/16W J TAPING R257 RC008091 BRFC165614Z CARBON FIXED CHIP 560 1/16W J TAPING R258 RC005260 BRFC166834Z CARBON FIXED CHIP 68K 1/16W J TAPING R259 RC005260 BRFC166834Z CARBON FIXED CHIP 68K 1/16W J TAPING R260 RC002899...
  • Page 55 LOC. REF. PART NO. DESCRIPTION R409 RC005241 BRFC161034Z CARBON FIXED CHIP 10K 1/16W J TAPING R410 RC005258 BRFC164744Z CARBON FIXED CHIP 470K 1/16W J TAPING R411 RC005282 BRFC162714Z CARBON FIXED CHIP 270 1/16W J TAPING R412 RC005281 BRFC162224Z CARBON FIXED CHIP 2.2K 1/16W J TAPING R414 RC005280...
  • Page 56 LOC. REF. PART NO. DESCRIPTION R460 RC005281 BRFC162224Z CARBON FIXED CHIP 2.2K 1/16W J TAPING R461 RC005241 BRFC161034Z CARBON FIXED CHIP 10K 1/16W J TAPING R462 RC005241 BRFC161034Z CARBON FIXED CHIP 10K 1/16W J TAPING R463 RC005253 BRFC163324Z CARBON FIXED CHIP 3.3K 1/16W J TAPING R464 RC005246...
  • Page 57 LOC. REF. PART NO. DESCRIPTION R793 RC002899 BRFC180004Z CARBON FIXED CHIP 0 1/8W J TAPING R797 RC002899 BRFC180004Z CARBON FIXED CHIP 0 1/8W J TAPING R798 RC005240 BRFC161024Z CARBON FIXED CHIP 1K 1/16W J TAPING R799 RC005311 BRFC160004Z CARBON FIXED CHIP 0 1/16W J TAPING RC008287 BRTY0572204...

  • Page 58: Assembly Parts List

    100×100×0.1T RC008423 VNYL3102500 VINYL BAG 100×250×0.1T ASSEMBLY PARTS LIST NOTE: Following part numbers are not available as replacement parts. Order parts necessary for repair or contact the Toshiba Factory Service Center. LOC. REF. PART NO. DESCRIPTION RC008508 AC222ZLBA MAIN PCB ASSEMBLY, BASE...

  • Page 59: Specifications

    SPECIFICATIONS MEASUREMENT CONDITIONS 1. Standard Voltage :Portable Unit ..DC 3.8V ± 0.025V :Base Unit ..AC 120V ± 3V 60Hz 2. Temperature ± 5 3. Channel FCC CH Portable(TX Frequency) Base(TX Frequency) 904.052470MHz 925.997470MHz 902.102465MHz 926.047470MHz 902.152465MHz 926.097470MHz 902.202465MHz 926.147470MHz 902.252465MHz 926.197470MHz...
  • Page 60 BASE UNIT RECEIVER UNIT NOMINAL LIMIT 1. Sensitivity 12 dB SINAD with CCITT Filter -115 < -107 2. Frequency Response (Ref:1kHz) 0.3kHz -4.0 -8.0~0.0 3.0kHz -3.0 -7.0~+1.0 3. Distortion at 1 mV RF Input < 5 4. S/N ratio at 1 mV RF Input with CCITT Filter 60 <...
  • Page 61 HANDSET UNIT RECEIVER UNIT NOMINAL LIMIT 1. Sensitivity 12 dB SINAD with CCITT Filter -115 < -107 2. Frequency Response (Ref:1kHz) 0.3kHz -1.5 -5.5~+2.5 3.0kHz -4.0 -8.0~0.0 3. Audio Output Level VOL. HIGH 161~322 VOL. MEDIUM 90~180 VOL. LOW 34~68 4.

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