Sony SPP-M920 Service Manual
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Sony SPP-M920 Service Manual

Sony SPP-M920 Service Manual

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SPP-M920
SERVICE MANUAL
US Model
SPECIFICATIONS
CORDLESS TELEP0HONE
MICROFILM

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Summary of Contents for Sony SPP-M920

  • Page 1 SPP-M920 SERVICE MANUAL US Model SPECIFICATIONS CORDLESS TELEP0HONE MICROFILM...

  • Page 2: Table Of Contents

    IC12, 13 ; Deleted (These were never available as service) parts. LIST ARE CRITICAL TO SAFE OPERATION. R140 (10k) Deleted REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE R138 (10k) Added PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.

  • Page 3: General

    SECTION 1 GENERAL LOCATION AND FUNCTION OF CONTROLS BASE UNIT !§ !¶ !• !¢ !∞ !ª @º @¡ @™ !£ !™ !¡ 9 !º !™ INTERCOM lamp 1 LINE 1 lamp !£ Speaker 2 LINE 1/FLASH button !¢ Antenna 3 MUTE button !∞...
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  • Page 11: Disassembly

    SECTION 2 DISASSEMBLY Note : Follow the disassembly procedure in the numerical order given. 2-1. BATTERY PACK REMOVAL Battery pack (BP-T23) Lid, Battery pack 2-2. HAND CABINET (REAR) REMOVAL Hand cabinet (Rear) 1 Screws (+BTP 3x12) Hand cabinet (Front) – 11 –...

  • Page 12: Antenna Removal

    2-3. ANTENNA REMOVAL Tube Antenna (ANT1) Hand cabinet (Front) 2-4. HAND MAIN BOARD REMOVAL 1 Screws (+BTP 2x6) 3 Screw (+BTP 3x12) Holder, Antenna 5 Screw (+BTP 3x12) 6 Screw (+P 3x8) 4 Screws (+P 2x8) Hand main board Switch, Rubber key (VOL) Hand main cabinet (Front) –...

  • Page 13: Circuit Operation

    SECTION 3 CIRCUIT OPERATION RF SECTION OVERVIEW 1.0 Introduction The basic function of the base and handset RF sections is to provide a full duplex wireless link between the handset and base sections of the telephone. This is accomplished by setting up two simultaneous communications links between the handset and base sections. The RF receiver and transmitter circuity essentially provide a link between the microphone and speaker in the handset to the telephone line in base set.
  • Page 14 1.2 Block diagram Both the handset and base RF sections follow the same block diagram shown below with only minor changes to incorporate the different transmit and receive frequencies. 2 POLE CERAMIC Ist RX AMP SAW FILTER 2nd RX AMP MIXER 10.7MHz CERAMIC IF AMP...
  • Page 15 902-905MHz Passband 10dB/div 1015 925-928MHz Reject Band Figure 2. Low band Ceramic filter response For this filter the insertion loss is less than 3dB at 902 to 905MHz while the 925 – 928MHz band has > 25dB attenuation. This filter is used for the RX filter in the handset or the TX filter in the base.
  • Page 16 2.2 Receive Section 2.2.1 RX Amps and SAW Filter The purpose of the first RX amp is to provide enough gain that the noise figure of the RX section is fixed to as low a value as possible. It must provide a good 50 ma tch to both the RX bandpass filter and the SAW filter. This amplifier must also have good power handling capability due to the limited filtering which precedes it.
  • Page 17 The AMD ASIC is a custom designed IC based on the core platform of the AMD CT2 baseband chipset. This custom modification contracted by SONY removes the protocol blocks associated with the CT2 TDD architecture and replaces it with a SONY proprietary FDD protocol block.
  • Page 18 3.1.3 System Control Functions 1) Microcontroller. An 8-bit 80C32T2 microcontroller executes the program and controls the protocol logic and other hardware configura- tion. It includes 16kbytes of mask-programmable ROM and 256bytes of RAM. It also includes an asynchronous serial port. 2) Synchronous Serial Port.

  • Page 19: Test Mode

    SECTION 4 TEST MODE Manual Test Mode Operation-PDL 2-Line Phone This document describes the steps for manual test mode entry and operation for both hanset and bese unit of the 2-line PDL phone. Handset Test Mode Entry To enter manual test mode on the hanset, follow these steps ; Step Display befor action Action...
  • Page 20 Action Display after action SPEED DIAL key * Test Mode * TxPwr : p ch : 5 Toggle radio transmitter (TX) power. When the key is pressed there is a key beep. Each press of the key will alternate the state of radio transmitter power. Display for TX power on.
  • Page 21 Base Unit Test Mode Entry To enter manual test mode on the base unit, follow these steps ; Step Action Display after action From base unit Idle, press the HOLD and CONF keys at The CHARGE LED will be illuminated and the LINE 1 the same time and change the position of the DIAL MODE LED will blink at a slow rate.

  • Page 22: Adjustments

    SECTION 5 ADJUSTMENTS 5-1. BASE UNIT SECTION 4. QUAD-TUNE VOLTAGE Adjustment Procedur e : • Set to base unit test mode. 1. Connect the FM rf signal generator to ANTENNA point. • Perform the adjustment at 5CH (RX : 926.25MHz, TX : FM rf signal generator condition : 903.5MHz) by removing R1 as a rule.
  • Page 23 [BASE MAIN BOARD] (SIDE B) 12 11 10 9 ATE TERMINAL TX LOOP V : Digital voltmeter RX LOOP V : Digital voltmeter QUAD-TUNE : Digital voltmeter Adjustments Location : C88 : RX LOOP VOLTAGE Adjustment C120 : 18.25MHz CLOCK REFERENCE Adjustment [BASE MAIN BOARD] (SIDE A) IC23...

  • Page 24: Handset Section

    5-2. HANDSET SECTION 4. QUAD-TUNE VOLTAGE Adjustment Procedur e : • Set to handset test mode. 1. Connect the FM rf signal generator to ANTENNA point. • Perform the adjustment at 5CH (RX : 903.5MHz, TX : FM rf signal generator condition : 926.25MHz) by removing C115 as a rule.

  • Page 25: Diagrams

    SECTION 6 DIAGRAMS 6-1. EXPLANATION OF IC TERMINALS (BASE UNIT SECTION) IC8 AM79C491JC-C10 (SYSTEM CONTROL) Pin No. Pin name Description Anlog audio output terminal. Anlog audio output terminal (Turn over output). Anlog audio input terminal. – Anlog power supply terminal (Ground). CFILT dc bias filter terminal.
  • Page 26 Pin No. Pin name Description AD00 Data bus (EXTERNAL ROM VERSION ONLY). AD01 Data bus (EXTERNAL ROM VERSION ONLY). AD02 Data bus (EXTERNAL ROM VERSION ONLY). AD03 Data bus (EXTERNAL ROM VERSION ONLY). AD04 Data bus (EXTERNAL ROM VERSION ONLY). AD05 Data bus (EXTERNAL ROM VERSION ONLY).

  • Page 27: Handset Section

    (HANDSET SECTION) IC11 AM79C491JC-C09 (SYSTEM CONTROL) Pin No. Pin name Description Analog audio output terminal. Analog audio output terminal. Analog audio input terminal. – Analog power supply (Ground). CFILT dc bias filter terminal. IREF Current reference output terminal. – Analog power supply terminal. TST1 Monitor discrimination terminal.
  • Page 28 Pin No. Pin name Description Address bus to the ROM (IC4). (EXTERNAL ROM VERSION ONLY) Address bus to the ROM (IC4). (EXTERNAL ROM VERSION ONLY) Address bus to the ROM (IC4). (EXTERNAL ROM VERSION ONLY) ATE RX ATE RX data input. ATE TX ATE TX data output.

  • Page 37: Exploded Views

    SECTION 7 EXPLODED VIEWS NOTE : • -XX, -X mean standardized parts, so they may • The mechanical parts with no reference number The components identified by mark ! have some difference from the original one. in the exploded views are not supplied. •...
  • Page 38 7-2. BASE UNIT SECTION LCD1 MIC1 ANT1 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 3-012-338-01 TERMINAL (CHARGE:HAND) * 63 3-012-337-11 CASE (REAR), SHIELD 3-012-335-01 HOLDER (MIC) * 64 3-012-329-01 HOLDER (ANTENNA) 1-771-042-11 SWITCH, SHEET (HAND) 1-771-037-11 SWITCH, RUBBER KEY (VOL) 1-771-038-21 SWITCH, RUBBER KEY (HAND) 3-012-317-11 CABINET (FRONT), HAND...

  • Page 39: Electrical Parts List

    SECTION 8 BASE KEY BASE MAIN ELECTRICAL PARTS LIST NOTE : • SEMICONDUCTORS • Due to standardization, replacements in the In each case, u : µ , for example : The components identified by mark ! parts list may be different from the parts speci- uA..
  • Page 40 BASE MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 1-162-913-11 CERAMIC CHIP 0.5PF C130 1-126-791-11 ELECT 10uF C131 1-136-193-11 FILM 0.47uF 250V 1-162-910-11 CERAMIC CHIP 0.25PF 50V C132 1-164-227-11 CERAMIC CHIP 0.022uF 1-162-910-11 CERAMIC CHIP 0.25PF 50V C133 1-164-227-11 CERAMIC CHIP...
  • Page 41 BASE MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C196 1-126-786-11 ELECT 47uF 1-233-889-11 FILTER, BAND PASS 1-767-454-11 FILTER, SAW C197 1-126-794-11 ELECT 4.7uF 1-567-107-71 FILTER, CERAMIC C198 1-162-970-11 CERAMIC CHIP 0.01uF 1-760-785-11 FILTER, CERAMIC C199 1-162-964-11 CERAMIC CHIP 0.001uF...
  • Page 42 BASE MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark T-941-615-31 TRANSISTOR MMBT3904 1-218-285-11 METAL GLAZE 1/16W 8-729-041-22 TRANSISTOR CF739R 1-216-810-11 METAL CHIP 1/16W 8-729-041-21 TRANSISTOR BFR92ALT1 1-218-285-11 METAL GLAZE 1/16W 8-729-041-21 TRANSISTOR BFR92ALT1 8-729-041-21 TRANSISTOR BFR92ALT1 1-216-833-11 METAL CHIP 1/16W 1-218-653-11 METAL CHIP...
  • Page 43 BASE MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 1-216-864-11 METAL CHIP 1/16W R171 1-216-812-11 METAL CHIP 1/16W 1-247-786-11 CARBON 1/4W R172 1-218-292-11 METAL GLAZE 1/16W 1-216-844-11 METAL CHIP 1/16W R173 1-218-272-11 METAL GLAZE 5.1K 1/16W R100 1-219-755-11 SURGE RESISTANT 10M...
  • Page 44 BASE MAIN HAND MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R236 1-216-833-11 METAL CHIP 1/16W < VARIABLE RESISTOR > R237 1-216-833-11 METAL CHIP 1/16W R238 1-216-833-11 METAL CHIP 1/16W 1-238-661-11 RES, ADJ, CERMET 1K (TX DEVIATION) R239 1-216-833-11 METAL CHIP 1/16W...
  • Page 45 HAND MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 1-162-923-11 CERAMIC CHIP 47PF 1-162-916-11 CERAMIC CHIP 12PF 1-162-910-11 CERAMIC CHIP 0.25PF 50V 1-162-923-11 CERAMIC CHIP 47PF 1-162-910-11 CERAMIC CHIP 0.25PF 50V 1-162-908-11 CERAMIC CHIP 0.25PF 50V 1-107-823-11 CERAMIC CHIP 0.47uF 1-163-077-00 CERAMIC CHIP...
  • Page 46 HAND MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 8-719-059-94 LED SML-010MT-T86 (KEY BACK LIGHT) 1-216-817-11 METAL CHIP 1/16W 8-719-059-94 LED SML-010MT-T86 (KEY BACK LIGHT) 1-216-844-11 METAL CHIP 1/16W 8-719-059-94 LED SML-010MT-T86 (KEY BACK LIGHT) 1-216-809-11 METAL CHIP 1/16W 8-719-909-90 DIODE BAV99...
  • Page 47 SPP-M920 HAND MAIN HAND VOL Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 1-216-829-11 METAL CHIP 4.7K 1/16W MISCELLANEOUS 1-216-833-11 METAL CHIP 1/16W ************** 1-216-833-11 METAL CHIP 1/16W 1-216-823-11 METAL CHIP 1.5K 1/16W 1-771-244-11 SWITCH, RUBBER KEY (BASE)
  • Page 48 SPP-M920 US Model SERVICE MANUAL CORRECTION-1 Correct your service manual as shown below. : Indicates corrected portion. Page INCORRECT CORRECT Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 1-775-542-11 CORD (WITH MODULAR PLUG)(LINE)(22cm) 1-696-453-21 CORD (WITH MODULAR PLUG)(LINE)(15cm)
  • Page 49 SPP-M920 US Model SERVICE MANUAL SUPPLEMENT - 3 File this Supplement with the Service Manual. Subject : ELECTRICAL PARTS LIST (ECN-CP800089) ELECTRICAL PARTS LIST (Service Manual see page 62, 67) Before change After change Ref. No. Part No. Description Remark Part No.

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