Toshiba FT-8808 Service Manual
  1. Manuals
  2. Brands
  3. Toshiba Manuals
  4. Cordless Telephone
  5. FT-8808
  6. Service manual
Toshiba FT-8808 Service Manual

Toshiba FT-8808 Service Manual

Hide thumbs Also See for FT-8808:
Table of Contents

Advertisement

Quick Links

Download this manual
FILE NO. 2B0-9810
SERVICE MANUAL
CORDLESS TELEPHONE
FT-8808
PUBLISHED IN JAPAN, Oct., 1998

Advertisement

Table of Contents
loading

Related Manuals for Toshiba FT-8808

Summary of Contents for Toshiba FT-8808

  • Page 1 FILE NO. 2B0-9810 SERVICE MANUAL CORDLESS TELEPHONE FT-8808 PUBLISHED IN JAPAN, Oct., 1998...

  • Page 2: Table Of Contents

    CONTENTS SAFETY PRECAUTIONS ........................1 OPERATING CONTROLS ........................2 ALIGNMENT PROCEDURE ........................3 BLOCK DIAGRAMS..........................9 SCHEMATIC DIAGRAMS........................14 TROUBLESHOOTING HINTS ......................26 IC AND TRANSISTOR VOLTAGE CHART ..................33 SEMICONDUCTOR LEAD IDENTIFICATION..................41 ELECTRICAL PARTS LOCATION ...................... 47 WIRING DIAGRAMS ........................... 53 EXPLODED VIEW AND MECHANICAL PARTS LIST ................

  • Page 3: Operating Controls

    OPERATING CONTROLS HANDSET CONTROLS Antenna RDL (Redial) button Liquid Crystal Display (LCD) CID (Caller ID) button TALK button Press to enter the caller ID mode. Number 1 button 0-9, , Dial buttons Used for long distance dialing. TONE button Number 8 ( ) button (time button) PAUSE button Used to display the date and time of the received calls.

  • Page 4: Alignment Procedure

    ALIGNMENT PROCEDURE Test Mode For Base Unit To change the unit to TEST mode, set the TONE/PULSE switch to PULSE position and press the PAGE key continuously for 2 seconds while resetting by turning the power on. When entered the TEST mode, the CHARGE LED turns off, the IN USE LED will light and the unit enters TEST mode 1.
  • Page 5 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 following table. ) 1.
  • Page 6 Base Unit Transmitter Section Connection BASE MAIN PCB AF GEN. BASE RF PCB Test Point Power Meter DC IN TEL Line Test Point 1kHz 45mV 9V Jack Jack Test Point Frequency Counter AC 120V DC 9V Adapter 60Hz Deviation Meter Preset Place the Base unit in VCO/TX FREQ.
  • Page 7 Receiver Section Connection BASE RF PCB BASE MAIN PCB AC Voltmeter Dummy Load RF SG (600-ohm) TEL Line DC IN Test Point Jack 9V Jack DC Voltmeter AF Terminal DC 9V AC 120V AC Adapter 60Hz Preset Place the Base unit in VCO/TX FREQ. ADJ mode in accordance with the procedure on page 3. Alignment Procedure Step Preset to...
  • Page 8 Handset Unit Transmitter Section Connection HANDSET RF PCB HANDSET MAIN PCB AF GEN. Test Point Power Meter Battery Test Point 1kHz 10.5mV MIC + Pin Terminals Test Point Frequency Counter DC Power Supply Deviation DC 3.8V Meter Preset Place the Handset in VCO/TX FREQ. ADJ mode in accordance with the procedure on page 4. Alignment Procedure Step Adjustment...
  • Page 9 Receiver Section Connection HANDSET MAIN PCB AC Voltmeter Oscilloscope HANDSET RF PCB Dummy Load RF SG (150-ohm) J602 Battery Test Point Connector Terminals J601 DC Voltmeter DC Power Supply AF Terminal 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 10: Block Diagrams

    BLOCK DIAGRAMS Base, Main — 9 —...
  • Page 11 Base, RF — 10 —...
  • Page 12 Handset, Main — 11 —...
  • Page 13 Handset, RF — 12 —...

  • Page 18: Troubleshooting Hints

    TROUBLESHOOTING HINTS 1. The bell does not ring. When the PAGE SW of the See 2. The bell does not base is pressed, does the ring & page does not ring. ringer on the handset ring? When the TEL SG is joined Check IC4 and TEL network with the base to make bell circuit.
  • Page 19 2. The bell does not ring & page does not ring. Can the base and handset See 3. The base and be connected? handset cannot be connected. Press handset DIAL key When the key of the Check IC603. while in TALK MODE. handset is pressed, can the Can key touch sound be pulse output at pin 58 of...
  • Page 20 3. The base and handset cannot be connected. Check IC5 and its Check whether the base is peripheral circuit. able to set in the test mode 1. Check the TX POWER and Check base RF unit. the TX FREQUENCY on the base unit.
  • Page 21 Set the handset in the test Check whether there is a Check VR601, R619, R632, mode 3, check whether 250Hz data waveform at R634, R635, R636 deviation of the TX data is pin 9 of J601. and C611. app. 7 kHz Dev. Check handset RF unit.
  • Page 22 4. Cannot make a phone call (pulse). See 3. The base and Can the base and handset handset cannot be be connected? connected. While in TALK MODE, Check IC5. press dial key of the handset. Check whether square waveform from pin 58 of IC5 is fed.
  • Page 23 6. Voice cannot be transmitted to other party (outgoing call). See 3. The base and Can the base and handset handset cannot be be connected? connected. Check Q608 and its The 1 kHz, 12.5 mV sine peripheral circuit. waveform is applied to MC601 side, can the 1 kHz sine waveform from...
  • Page 24 7. The voice of the caller cannot be heard (incoming call). See 3. The base and Can the base and handset handset cannot be be connected? connected. Check the base TEL-line The 1 kHz 77.5 mV sine circuit and RELAY control waveform is applied to circuit.

  • Page 25: Ic And Transistor Voltage Chart

    IC AND TRANSISTOR VOLTAGE CHART Transistors Unit [V] Unit [V] Ref. Ref. STBY TALK Note STBY TALK Note 1.0/3.0 0.6/0.8 0/1.0 1/1.0 0/3.2 0/3.2 0/0.6 0/0.6 Q201 Q202 Q203 Q206 Q207 Q211 Q212 Q501 Q502 Q503 Q506 Q507 — 28 —...
  • Page 26 Unit [V] IC'S Unit [V] Ref. Ref. STBY TALK Note STBY TALK Note Q511 Q512 0/2.4 0.5/2.0 Q601 0/0.8 0/0.7 0/0.8 Q602 0/0.5 Q603 0/3.2 0/3.2 Q604 0/0.6 0/0.6 Q605 Q606 Q607 Q608 Q609 0/3.2 0/3.2 Q610 2.8/3.0 Q611 Q612 0/3.2 Q613 Q661...
  • Page 27 Unit [V] Unit [V] Ref. Ref. STBY TALK Note STBY TALK Note 0.6/2.6 0.6/2.6 0.3/3.0 0.3/3.0 0/3.2 0/3.2 0/2.8 0/2.8 0/2.8 0.4/2.6 0.4/2.6 SINE WAVE 0/2.6 0/2.6 SINE WAVE IC10 0.3/2.3 0.3/2.3 IC11 0.2/3.2 — 30 —...
  • Page 28 Unit [V] Unit [V] Ref. Ref. STBY TALK Note STBY TALK Note IC11 IC501 IC201 IC502 IC202 1.0/1.4 IC601 1.0/1.4 IC602 0/3.2 IC501 IC603 — 31 —...
  • Page 29 Unit [V] Unit [V] Ref. Ref. STBY TALK Note STBY TALK Note 0/3.2 0/3.2 0/3.2 2.8/3.0 0/2.8 IC603 2.8/3.0 0/1.0 0.8/2.8 IC604 2.8/3.0 IC605 0/2.4 0/2.4 SINE WAVE 0/3.0 0/3.0 SINE WAVE IC661 0/2.8 0/2.8 IC603 0/3.2 IC662 0/2.8 0/2.8 0/2.8 0/2.8 0/2.8...

  • Page 30: Semiconductor Lead Identification

    SEMICONDUCTOR LEAD IDENTIFICATION Base Unit D3: LTL-16KGE D1: HZ33-2 D10: RLS4148 D4: LTL-16KPE D2/D5/D7/D8/D9/D11/D12/D17/D18: 1N4148 D13/D14: 1N4003 D20: HZ6A2 Cathode Anode Anode Cathode Cathode Anode D19:VRPG3312X D201: 1SS226 D15: HSM88WA D16: HZK6C Anode1, 2 Anode/Cathode Cathode Anode Cathode1 Cathode2 Anode (Red) Anode Cathode Anode...
  • Page 31 RH5VL42CA IR3N74AN M5223L PC817 RH5VL28CA IC10 RH5VL35CA MUTE MUTE EREC CREC VREF µ MT88E43 24LC16BT/SN PD75116 64 63 62 61 60 59 58 57 56 55 54 53 52 TK11232AM CONT NOISE BYPASS Vout 20 21 22 23 24 25 26 27 28 29 30 31 32 IC202 M64084AGP IC11...
  • Page 32 Handset D501/D667: 1SS226 D502/D503: 1SV270 D601/D604: RLS4148 Anode/Cathode Cathode Anode Cathode Anode Anode Cathode D605: S1ZB20 D606/D608/D609/D610: HSM88WA D607: HZK6C − Anode1, 2 Cathode Anode Cathode1 Cathode2 D661/D662/D663: CL-220G Q501: 2SC4095 Cathode Anode Q503: 2SC2714 Q601/Q602/Q603/Q604/Q607/Q608/Q610/Q611/Q612/Q613/Q661: 2SC2712 Q502/Q511/Q605/Q606/Q609/Q662: 2SA1162 Q506/Q507/Q512: 2SC5065 B: Base E: Emitter C: Collector...
  • Page 33 IC501 IC603 MC3361CDR2 MB89627RPFM Mixer Input Crystal Osc. Audio Mixer Mute Output Scan Control Squelch Limiter Input Input Filter Output Decoupling Filter Input Quad Demodulator Audio Input IC502 M64084AGP MIX REF Tx OUT MIX IN Tx Vcc Rx Vcc IC601 Tx GND Rx GND IR3N74AN...

  • Page 34: Electrical Parts Location

    ELECTRICAL PARTS LOCATION Base, Main — 37 —...
  • Page 35 Base, RF — 38 —...
  • Page 36 Handset, Main — 39 —...
  • Page 37 Handset, RF — 40 —...

  • Page 38: Wiring Diagrams

    WIRING DIAGRAM Handset — 41 —...

  • Page 39: Exploded View And Mechanical Parts List

    EXPLODED VIEW AND MECHANICAL PARTS LIST Base, Unit Note: To remove the RF Assembly from the unit, remove four screws 24 . Three screws 23 are used for fastening the Shield Cases 26 and 27 .
  • Page 40 Base Unit LOC. PART NO. REF. NO. DESCRIPTION RC008040 GNBZ458919Z Button, Push for FT-8808 RC008856 GNBZ458579Z Button, Push for FT-8808BK RC008897 GCAS458497Z Case, Battery for FT-8808 RC005680 GCAS257882Z Case, Battery for FT-8808BK RC008039 GCAS258917Z Case, Bottom for FT-8808 RC008853 GCAS158576Z...
  • Page 41 Handset Note: To remove the RF Assembly from the unit, remove four screws 69 . Three screws 68 are used for fastening the Shield Cases 70 and 71 .
  • Page 42 PART NO. REF. NO. DESCRIPTION RC008915 RBLD458506Z Blind for FT-8808 RC008714 RBLD457881Z Blind for FT-8808BK RC008044 GNBZ458923Z Button, Function for FT-8808 RC008705 GNBZ357892Z Button, Function for FT-8808BK RC008912 GNBZ458504Z Button, Push for FT-8808 RC008706 GNBZ457891Z Button, Push for FT-8808BK RC008042...

  • Page 43: 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 44 LOC. PART NO. DESCRIPTION RC001632 BCXT813335Z CERAMIC 0.033UF 50V K B RC001068 BCXT811025Z CERAMIC 0.001UF 50V K B RC002224 BCXK811040Z CERAMIC 0.1UF 50V Z F RC004008 BCBH813314Z CERAMIC 330PF 50V J CH RC002849 BCXK512240Z CERAMIC 0.22UF 25V Z F RC002849 BCXK512240Z CERAMIC 0.22UF 25V Z F...
  • Page 45 LOC. PART NO. DESCRIPTION C213 RC005208 BCML814725Z CERAMIC 0.0047UF 50V K B C214 RC005205 BCML811035Z CERAMIC 0.01UF 50V K B C215 RC005205 BCML811035Z CERAMIC 0.01UF 50V K B C216 RC005215 BCMM812704Z CERAMIC 27PF 50V J CH C217 RC005216 BCMM813304Z CERAMIC 33PF 50V J CH C218 RC005202...
  • Page 46 LOC. PART NO. DESCRIPTION C259 RC005217 BCMM813314Z CERAMIC 330PF 50V J CH C260 RC004185 BCSS951006Z TANTALUM CHIP 10UF 7V M A C-241 C261 RC005218 BCMM814091Z CERAMIC 4PF 50V C CH C262 RC008753 BCMM812098Z CERAMIC 2PF 50V B CH C263 RC005360 BCMM816092Z CERAMIC 6PF 50V D CH C265...
  • Page 47 LOC. PART NO. DESCRIPTION C518 RC005202 BCML311045Z CERAMIC 0.1UF 16V K B C519 RC005223 BCMS812091Z CERAMIC 2PF 50V C CK C520 RC005205 BCML811035Z CERAMIC 0.01UF 50V K B C521 RC005216 BCMM813304Z CERAMIC 33PF 50V J CH C522 RC005204 BCML811025Z CERAMIC 0.001UF 50V K B C523 RC008755...
  • Page 48 LOC. PART NO. DESCRIPTION C565 RC005216 BCMM813304Z CERAMIC 33PF 50V J CH C566 RC005204 BCML811025Z CERAMIC 0.001UF 50V K B C567 RC008752 BCML512735Z CERAMIC 0.027UF 25V K B C568 RC005218 BCMM814091Z CERAMIC 4PF 50V C CH C569 RC005216 BCMM813304Z CERAMIC 33PF 50V J CH C570 RC005218...
  • Page 49 LOC. PART NO. DESCRIPTION C623 RC002229 BCXT511045Z CERAMIC 0.1UF 25V K B C624 RC001069 BCXT811035Z CERAMIC 0.01UF 50V K B C625 RC001069 BCXT811035Z CERAMIC 0.01UF 50V K B C626 RC001071 BCXT813325Z CERAMIC 0.0033UF 50V K B C627 RC001071 BCXT813325Z CERAMIC 0.0033UF 50V K B C628 RC001069...
  • Page 50 LOC. PART NO. DESCRIPTION D017 RC002236 BDAY0246003 DIODE AX TS 26+ 1N4148 T-77 D018 RC002236 BDAY0246003 DIODE AX TS 26+ 1N4148 T-77 D019 RC004661 BDAY0920001 VRPG3312X D020 RC008846 BDAY0492018 ZENER AX TS 26 + HZ6A2 TD D201 RC001635 BDAY0274001 DIODE 1SS226 TE85L D202 RC008759...
  • Page 51 LOC. PART NO. DESCRIPTION IC501 RC004870 BDEY2768003 MC3361CDR2 IC502 RC008761 BDEY3571003 M64084AGP-601C IC601 RC002588 BDEY2207001 IR3N74AN IC602 RC005648 BDEY3414003 TK11232AM TAPE IC603 RC008858 BDDY0774001 UC2233 MB89627RPFM-580 IC604 RC008861 BDEY2989003 RH5VL33AA-T1 IC605 RC005074 BDEY2937003 RH5VL28CA-T1 IC661 RC008860 BDEY2969003 24LC04BT/SN IC662 RC008859 BDEY2927003 RH5RE32AA-T1 JACKS...
  • Page 52 LOC. PART NO. DESCRIPTION L512 RC004876 BLFY0274001 COIL LF-274 615LN-0124=P3 L515 RC005234 BLZY0127157 INDUCTOR LZ-127 0.015UH J TAPE T001 RC003234 BTFY0265001 TRANSFORMER TF-265 IT-24E-1B(R295403) TRANSISTORS RC001637 BDBC2712303 DB-381 2SC2712-GR TE85L RC001637 BDBC2712303 DB-381 2SC2712-GR TE85L RC001637 BDBC2712303 DB-381 2SC2712-GR TE85L RC001637 BDBC2712303 DB-381 2SC2712-GR TE85L...
  • Page 53 LOC. PART NO. DESCRIPTION Q607 RC001637 BDBC2712303 DB-381 2SC2712-GR TE85L Q608 RC001637 BDBC2712303 DB-381 2SC2712-GR TE85L Q609 RC001081 BDBA1162107 DB-036 2SA1162-G(GR)TE85L Q610 RC001637 BDBC2712303 DB-381 2SC2712-GR TE85L Q611 RC001637 BDBC2712303 DB-381 2SC2712-GR TE85L Q612 RC001637 BDBC2712303 DB-381 2SC2712-GR TE85L Q613 RC001637 BDBC2712303 DB-381 2SC2712-GR TE85L...
  • Page 54 LOC. PART NO. DESCRIPTION R041 RC002898 BRFC010004Z CARBON 1/10W J TAPING R042 RC002322 BRFC014734Z CARBON 1/10W J TAPING R043 RC002296 BRFC011024Z CARBON 1/10W J TAPING R044 RC002325 BRFC015634Z CARBON 1/10W J TAPING R045 RC002326 BRFC015644Z CARBON 560K 1/10W J TAPING R046 RC002297 BRFC011034Z...
  • Page 55 LOC. PART NO. DESCRIPTION R087 RC002299 BRFC011224Z CARBON 1.2K 1/10W J TAPING R088 RC002499 BRFC013914Z CARBON 1/10W J TAPING R091 RC002306 BRFC012224Z CARBON 2.2K 1/10W J TAPING R092 RC002322 BRFC014734Z CARBON 1/10W J TAPING R093 RC002296 BRFC011024Z CARBON 1/10W J TAPING R094 RC002316 BRFC013924Z...
  • Page 56 LOC. PART NO. DESCRIPTION R134 RC005658 BRPA148204Z CARBON 1/4W J TAPING R135 RC002322 BRFC014734Z CARBON 1/10W J TAPING R136 RC002306 BRFC012224Z CARBON 2.2K 1/10W J TAPING R137 RC002303 BRFC011544Z CARBON 150K 1/10W J TAPING R138 RC002314 BRFC013334Z CARBON 1/10W J TAPING R139 RC002299 BRFC011224Z...
  • Page 57 LOC. PART NO. DESCRIPTION R241 RC005240 BRFC161024Z CARBON 1/16W J TAPING R242 RC005279 BRFC161514Z CARBON 1/16W J TAPING R244 RC005251 BRFC163304Z CARBON 1/16W J TAPING R246 RC005256 BRFC164724Z CARBON 4.7K 1/16W J TAPING R251 RC005239 BRFC161014Z CARBON 1/16W J TAPING R252 RC008765 BRFC161004Z...
  • Page 58 LOC. PART NO. DESCRIPTION R541 RC005240 BRFC161024Z CARBON 1/16W J TAPING R542 RC005279 BRFC161514Z CARBON 1/16W J TAPING R544 RC005251 BRFC163304Z CARBON 1/16W J TAPING R546 RC005256 BRFC164724Z CARBON 4.7K 1/16W J TAPING R551 RC005239 BRFC161014Z CARBON 1/16W J TAPING R552 RC008765 BRFC161004Z...
  • Page 59 LOC. PART NO. DESCRIPTION R636 RC005283 BRFC162734Z CARBON 1/16W J TAPING R637 RC005311 BRFC160004Z CARBON 1/16W J TAPING R638 RC005257 BRFC164734Z CARBON 1/16W J TAPING R640 RC005240 BRFC161024Z CARBON 1/16W J TAPING R641 RC005673 BRFC163934Z CARBON 1/16W J TAPING R642 RC005240 BRFC161024Z CARBON...
  • Page 60 X502 RC004888 BQXY0627001 CRYSTAL QX-627 13.865MHZ X601 RC003720 BQXY0526001 CRYSTAL QX-526 4.192M OTHER ELECTRICAL PARTS AD901 RC003528 BADY0288001 AC ADAPTOR for FT-8808 AD-288 AD901 RC003328 BADY0037001 AC ADAPTOR for FT-8808BK AD-037 KAD-2216 AT301 RC005633 BATY0335001 ANTENNA AT-335 BT901 RC005634 BBTY0374001...
  • Page 61 LOC. PART NO. DESCRIPTION PACKING PARTS RC005198 UDZZ73535ZZ CAUTION BELT RC004291 WETC420086Z COVER:ANT. RC008872 WBXZ358925Z DISPLAY BOX RC008833 WBXZ358656Z DISPLAY BOX for BK RC004688 PLBB454286Z LABEL:BARCODE PAPER RC004689 PLBB454287Z LABEL:BARCODE PAPER RC005079 WBAG435498Z MIRA MAT RC008869 UCZZ01200BZ OWNER'S MANUAL RC008845 RETC458740Z PROTECTION COVER RC008036...

  • Page 62: Assembly Parts List

    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. PART NO. DESCRIPTION RC008049 AC200BLBA BASE MAIN ASSEMBLY RC008746 AD846BLBB BASE RF ASSEMBLY RC008050...

  • Page 63: Specifications

    SPECIFICATIONS Measurement Conditions Standard Voltage: DC 3.8 V ±0.025 V Handset Unit AC 120 V ±3 V 60 Hz Base Unit 25 °C ±5 °C Temperature: Channel: Portable (TX Frequency) Base (TX Frequency) 902.080435MHz 925.989636MHz 902.130671MHz 926.039871MHz 902.180906MHz 926.090107MHz 902.231142MHz 926.140342MHz 902.281377MHz 926.190577MHz...
  • Page 64 Base Unit Receiver Unit Nominal Limit −115 < −107 Sensitivity 12dB SINAD (CCITT Filter ON) −1.5 −5.5 ~ +2.5 Frequency Response 0.3 kHz −3.5 −7.5 ~ +0.5 3.0 kHz Distortion at 1 mV RF Input < 5 S/N ratio at 1 mV RF Input (CCITT Filter ON, Compander ON) >...
  • Page 65 Telephone Line Unit Nominal Limit Off-hook Impedance (at 1 kHz) 1000 500 ~ 1500 Off-hook DC Resistance (DC 40 mA) 100 ~ 300 On-hook Impedance 20 Hz (75 Vrms) kohm > 10 Minimum Ringer Input Level < 40 Pulse Dialing a.
  • Page 66 Transmitter Unit Nominal Limit RF Power (50 Ω Load) −7 −10 ~ −4 Modulation Sensitivity 10.5 7 ~ 15 −1 −5 ~ +3 Frequency Response 0.3 kHz −1 −5 ~ +3 3.0 kHz ±1500 Frequency Tolerance (25 °C) Code Deviation <...
  • Page 67 MECHANICAL PARTS LIST TOSHIBA AMERICA CONSUMER PRODUCTS, INC. 82 TOTOWA ROAD, WAYNE, N.J. 07470 TOSHIBA HAWAII, INC. 327 KAMAKEE ST., HONOLULU, H.I. 96814...

Table of Contents