Toshiba FT-7800 Service Manual
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Toshiba FT-7800 Service Manual

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FILE NO. 2B0-200001
SERVICE MANUAL
CORDLESS TELEPHONE
FT-7800
PUBLISHED IN JAPAN, June., 2000

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  • Page 1 FILE NO. 2B0-200001 SERVICE MANUAL CORDLESS TELEPHONE FT-7800 PUBLISHED IN JAPAN, June., 2000...

  • Page 2: Table Of Contents

    CONTENTS SAFETY PRECAUTIONS ......................1 OPERATING CONTROLS ......................2 ALIGNMENT PROCEDURE ......................3 BLOCK DIAGRAMS ........................7 SCHEMATIC DIAGRAMS ......................9 TROUBLESHOOTING HINTS ....................13 IC AND TRANSISTOR VOLTAGE CHART ................20 SEMICONDUCTOR LEAD IDENTIFICATION ................24 ELECTRICAL PARTS LOCATION ..................... 26 WIRING DIAGRAMS .........................

  • Page 3: Operating Controls

    OPERATING CONTROLS HANDSET CONTROLS AND FUNCTIONS Antenna Speaker TALK/BATT.LOW LED MEM button TALK button FLASH button TALK BATT LOW TALK FLASH Dialpad TONE button CH button REDIAL button pqrs wxyz TONE VOL/RING button oper REDIAL PAUSE VOL/RING MEM1 MEM2 MEM3 PAUSE button One-touch dialing button Rechargeable Battery Pack...

  • Page 4: Alignment Procedure

    ALIGNMENT PROCEDURE 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 a) Connect the base RF unit to the base main unit. b) Set the “TONE / PULSE”...
  • Page 5 Receiver Section Connections BASE Unit AC Voltmeter RF SG Dummy Load (600-ohm) TEL Line Test Point Jack DC Voltmeter DC IN 9V Jack Terminal AC 120V 60Hz Adapter Preset a) Connect the base RF unit to the base main unit. b) Set the “TONE/PULSE”...
  • Page 6 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 a) Connect the handseet RF unit to the handset main unit. b) Connect DC power supply to battery connector on the handset unit.
  • Page 7 Receiver Section Connections HANDSET Unit AC Voltmeter RF SG Dummy Load (150-ohm) Test Point Terminal DC Power Supply J401 DC Voltmeter Battery Test Point Connector DC 3.8V Preset a) Connect the handset RF unit to the handset main unit. b) Connect DC power supply to battery connector on the handset unit. c) Turn the DC power supply ON while pressing “...

  • Page 8: Block Diagrams

    BLOCK DIAGRAMS Base Unit...
  • Page 9 Handset...

  • Page 10: Schematic Diagrams

    SCHEMATIC DIAGRAMS Base Unit...
  • Page 11 Handset...

  • Page 12: 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 IC4 and TEL network with the base to make bell circuit.
  • Page 13 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 14 3. The base and handset cannot be connected. Check whether the base Check IC5 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. Press the “PAGE”...
  • Page 15 Press the “3” key, check Check whether there is a Check RT403, R441, whether deviation of the 250 Hz data waveform at R442, R443, R444, TX data is app. 8 kHz “MOD” of RF unit. R445 and C453. Dev. Check handset RF unit. Press the “6”...
  • Page 16 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 IC5. number key of the handset. Check whether square waveform from pin 13 of IC5 is fed.
  • Page 17 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 18 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 19: 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 1.2(AC) 1.2(AC) 1.8(AC) 1.8(AC) OPEN OPEN 0-3.2 0-3.2 OPEN OPEN OPEN OPEN OPEN OPEN OPEN OPEN OPEN OPEN OPEN OPEN OPEN...
  • Page 20 Unit[V] Ref. No. PIN STBY TALK NOTE OPEN...
  • Page 21 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 0-1.8 IC404 1.0-3.0 OPEN 0-3.0 IC403 0-1.0 0-3.0 OPEN 0-3.0...
  • Page 22 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 23: Semiconductor Lead Identification

    SEMICONDUCTOR LEAD IDENTIFICATION Base Unit D6 : MPG3371XT D1 /D4 / D9 / D10 : 1N4148 D3 : HZ33-2 D11 : HZ7A3 D13 : HZ4B1 Anode Cathode Cathode Anode Q1 : 2SC2714 Q7 / Q8 / Q11 : 2SD471 Q2 / Q3 / Q4 / Q6 / Q9 / Q10 : 2SC1623 Q12 : 2SA812(M) B : Base E : Emitter...
  • Page 24 Handset D407 : HSM88WA D408 : SML-310LT D401 / D402 / D405 / D406 : RLS4148 D403 / D404 : HZK6C Anode Cathode Anode Anode Cathode Cathode Cathode Q401 : 2SC2714 Q402 / Q404 / Q405 / Q406 / Q407 / Q408 / Q409 / Q410 / Q411 / Q412 : 2SC1623 Q403 : 2SA812(M) B : Base...

  • Page 25: Electrical Parts Location

    ELECTRICAL PARTS LOCATION Base Unit Main PCB...
  • Page 26 Handset Main PCB...

  • Page 27: Wiring Diagrams

    WIRING DIAGRAMS Base Unit...
  • Page 28 Handset...

  • Page 29: Exploded View And Mechanical Parts List

    EXPLODED VIEWS AND MECHANICAL PARTS LIST Base Unit RF MODULE (BASE) ANTENNA...
  • Page 30 Base Unit LOC. REF. PART NO. DESCRIPTION RC009206 GNBZ443013Z BUTTON, PUSH RC009202 GCAS343012Z CASE, BOTTOM RC009203 GCAS347424Z CASE, TOP RC009207 HTML442794Z CHARGE TERMINAL C5210(PBSP) RC002384 LFUT428079Z FOOT BUMPON SJ-5916 1.6T RC009205 GCAS456869A HOOK RC009208 PLBS447453Z LABEL, ID POLYESTER RC009204 GCAS442792A LED LENS PMMA RC008289...
  • Page 31 Handset RF MODULE (HANDSET)
  • Page 32 Handset LOC. REF. PART NO. DESCRIPTION RC009222 RBLD459840Z BLIND RC009217 GNBZ443016Z BUTTON, FUNCTION RC009213 GCAS347434Z CASE, FRONT RC009212 GCAS343014Z CASE, REAR RC009218 HTML459366A CHARGE TERMINAL C2680(BSP) RC008703 GCAS457897Z COVER ELASTOMER RC009215 GCAS459542A COVER, BATTERY RC004286 RCUN451209Z CUSHION NEOPRENE RC008347 RCUM441150Z CUSHION MOLTPRENE, 40*20*8 RC009214...

  • Page 33: 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 34 LOC. REF. PART NO. DESCRIPTION RC001794 BCAZ111016Z ELECTROLYTIC 100UF 10V M C-156 RC005202 BCML311045Z CERAMIC M/L (1608) TAPE 0.1UF 16V K B RC001805 BCAZ811096Z ELECTROLYTIC 1UF 50V M C-156 RC008472 BCEQ814786Z ELECTROLYTIC 0.47UF 50V M C-125 RC005276 BCML818225Z CERAMIC M/L (1608) TAPE 0.0082UF 50V K B RC005202 BCML311045Z...
  • Page 35 LOC. REF. PART NO. DESCRIPTION C402 RC005401 BCXT111055Z CERAMIC M/L (2125) TAPE 1UF 10V K B C403 RC005202 BCML311045Z CERAMIC M/L (1608) TAPE 0.1UF 16V K B C404 RC005214 BCMM812214Z CERAMIC M/L (1608) TAPE 220PF 50V J CH C405 RC005214 BCMM812214Z CERAMIC M/L (1608) TAPE 220PF 50V J CH C406 RC005216...
  • Page 36 LOC. REF. PART NO. DESCRIPTION C456 RC001045 BCEQ311006Z ELECTROLYTIC 10UF 16V M C-125 C457 RC005208 BCML814725Z CERAMIC M/L (1608) TAPE 0.0047UF 50V K B C458 RC005223 BCMS812091Z CERAMIC M/L (1608) TAPE 2PF 50V C CK C459 RC005216 BCMM813304Z CERAMIC M/L (1608) TAPE 33PF 50V J CH C460 RC005216 BCMM813304Z CERAMIC M/L (1608) TAPE...
  • Page 37 LOC. REF. PART NO. DESCRIPTION RC004870 BDEY2768003 MC3361CDR2 RC008277 BDEY2268001 PS2501-1 K RC009197 BDDY0919001 UC2378 MB89173PF-G-261-BND-U RC005074 BDEY2937003 RH5VL28CA-T1 IC401 RC004870 BDEY2768003 MC3361CDR2 IC403 RC008278 BDEY3870003 LA8633VU-TLM IC404 RC009210 BDDY0920001 UC2379 MB89174LPF-G-262-BND-U IC405 RC008322 BDEY3882003 TK11130SCL IC406 RC008323 BDEY3886003 XC612N3328MR JACKS RC008992 BJKY1183002...
  • Page 38 LOC. REF. PART NO. DESCRIPTION RESISTORS RC005259 BRFC166814Z CARBON FIXED CHIP 680 1/16W J TAPE RC005245 BRFC161834Z CARBON FIXED CHIP 18K 1/16W J TAPE RC005281 BRFC162224Z CARBON FIXED CHIP 2.2K 1/16W J TAPE RC005258 BRFC164744Z CARBON FIXED CHIP 470K 1/16W J TAPE RC005253 BRFC163324Z CARBON FIXED CHIP...
  • Page 39 LOC. REF. PART NO. DESCRIPTION RC005240 BRFC161024Z CARBON FIXED CHIP 1K 1/16W J TAPE RC005241 BRFC161034Z CARBON FIXED CHIP 10K 1/16W J TAPE RC005257 BRFC164734Z CARBON FIXED CHIP 47K 1/16W J TAPE RC005242 BRFC161044Z CARBON FIXED CHIP 100K 1/16W J TAPE RC005241 BRFC161034Z CARBON FIXED CHIP...
  • Page 40 LOC. REF. PART NO. DESCRIPTION R412 RC005281 BRFC162224Z CARBON FIXED CHIP 2.2K 1/16W J TAPE R413 RC005311 BRFC160004Z CARBON FIXED CHIP 0 1/16W J TAPE R414 RC008027 BRFC161234Z CARBON FIXED CHIP 12K 1/16W J TAPE R415 RC005283 BRFC162734Z CARBON FIXED CHIP 27K 1/16W J TAPE R416 RC005248 BRFC162234Z...
  • Page 41 LOC. REF. PART NO. DESCRIPTION R459 RC005256 BRFC164724Z CARBON FIXED CHIP 4.7K 1/16W J TAPE R460 RC005281 BRFC162224Z CARBON FIXED CHIP 2.2K 1/16W J TAPE R461 RC005241 BRFC161034Z CARBON FIXED CHIP 10K 1/16W J TAPE R462 RC005241 BRFC161034Z CARBON FIXED CHIP 10K 1/16W J TAPE R463 RC005253 BRFC163324Z...

  • Page 42: Assembly Parts List

    300×300×700×0.07T RC008353 VNYL3101000 VINYL BAG 100×100×0.1T 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 RC009230 AC273BHBA BASE MAIN PCB ASSEMBLY...

  • Page 43: Specifications

    SPECIFICATIONS MEASUREMENT CONDITIONS 1. Standard Voltage :Portable Unit ..DC 3.8V ± 0.025V :Base Unit ..AC 120V ± 3V 60Hz 2. Temperature :25℃ ± 5℃ 3. Channel FCC CH Portable(TX Frequency) Base(TX Frequency) 902.052464MHz 925.997470MHz 902.102465MHz 926.047470MHz 902.152465MHz 926.097470MHz 902.202465MHz 926.147470MHz 902.252465MHz...
  • Page 44 BASE UNIT RECEIVER UNIT NOMINAL LIMIT 1. Sensitivity 12 dB SINAD with CCITT Filter -115 < -107 2. Frequency Response (Ref:1kHz) 0.3kHz -2.0 -6.0~+2.0 3.0kHz -5.5 -9.5~-1.5 3. Distortion at 1 mV RF Input < 5 4. S/N ratio at 1 mV RF Input with CCITT Filter 60 <...
  • Page 45 PORTABLE UNIT RECEIVER UNIT NOMINAL LIMIT 1. Sensitivity 12 dB SINAD with CCITT Filter -115 < -107 2. Frequency Response (Ref:1kHz) 0.3kHz -4.0~+4.0 3.0kHz -5.0 -9.0~-1.0 3. Audio Output Level VOL. LOUD 198~395 VOL. HIGH 92~183 VOL. NOR 35~70 4. Distortion at 1 mV RF Input VOL.

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