sony_icf-m770lssl_sm 电路图 维修原理图.pdf

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1、SERVICE MANUAL ICF-M770L FM/MW/LW PLL SYNTHESIZED ICF-M770S FM/SW/MW PLL SYNTHESIZED ICF-M770SL FM/SW/LW PLL SYNTHESIZED AEP Model ICF-M770L/M770SL UK Model ICF-M770L Italian Model East European Model ICF-M770S SPECIFICATIONS ICF-M770L/M770S/M770SL Ver 1.1 2002.06 9-873-657-02Sony Corporation 2002F0

2、500-1Personal Audio Company C 2002.06Published by Sony Engineering Corporation Photo: ICF-M770SL Time display: 24-hour system Frequency range: BandICF-M770L ICF-M770SICF-M770SLChannel step FM87.5 87.5 87.5 0.05 MHz 108 MHz108 MHz108 MHz SW5 800 5 800 5 kHz 15 900 kHz15 900 kHz MW531 531 9 kHz 1 602

3、kHz1 602 kHz LW153 153 9 kHz 279 kHz279 kHz Speaker: 12 cm (434 inches), 8 Power output: 350 mW (at 10% harmonic distortion) Output: v (earphone) jack ( 3.5 mm minijack) Power requirements: 220230 V AC, 50Hz 6 V DC, four R20 (size D) batteries Dimensions: Approx. 277 156 71.5 mm (w/h/d) (Approx. 11

4、614 278 inches) incl. projecting parts and controls Mass: Approx. 1 540 g (3lb 6 oz ) incl. batteries Supplied accessories: AC power cord (1) Design and specifications are subject to change without notice. RadioFans.CN 2 ICF-M770L/M770S/M770SL CF2 CF3 mark TABLE OF CONTENTS 1.SERVICING NOTE.2 2.GENE

5、RAL.3 3.DISASSEMBLY 3-1.Disassembly Flow .4 3-2.Cabinet Rear Assy.4 3-3.Chassis Assy.5 3-4.MAIN Board .5 4.ELECTRICAL ADJUSTMENTS.6 5.DIAGRAMS 5-1.Block Diagram .8 5-2.Note for Printed Wiring Boards and Schematic Diagrams .9 5-3.Printed Wiring Boards MAIN/JACK/POWER/INLET Boards . 10 5-4.Schematic D

6、iagram MAIN/JACK/POWER/INLET Boards . 11 5-5.Printed Wiring Board KEY Board . 12 5-6.Schematic Diagram KEY Board . 13 5-7.IC Pin Function Description . 14 6.EXPLODED VIEWS 6-1.Cabinet (Front) Section. 15 6-2.Cabinet (Rear) Section. 16 6-3.Chassis Section . 17 7.ELECTRICAL PARTS LIST. 18 SAFETY-RELAT

7、ED COMPONENT WARNING! COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB- LISHED BY SONY. Notes on

8、chip component replacement Never reuse a disconnected chip component. Notice that the minus side of a tantalum capacitor may be dam- aged by heat. SECTION 1 SERVICING NOTE MarkCenter frequency red10.70 MHz blue10.67 MHz orange10.73 MHz black10.64 MHz white10.76 MHz HOW TO CHANGED THE CERAMIC FILTERS

9、 This model is used two ceramic filters of CF2 and CF3. You must use same type of color marked ceramic filters in order to meet same specifications. Therefore, the ceramic filter must be changed two pieces together since its supply two pieces in one package as a spare parts. RadioFans.CN 3 ICF-M770L

10、/M770S/M770SL SECTION 2 GENERAL This section is extracted from instruction manual. A Rear Arrire Rckseite Parte posterior Achterkant R20 (size D) 4 R20 (D) 4 R20 (Gre D) 4 R20 (tamao D) 4 R20 (D) 4 Insert E side of the battery first. Insrez la borne E de la pile en premier. Legen Sie die Batterien m

11、it dem Minuspol E zuerst ein. Inserte primero el lado E de la pila. Breng de E kant van de batterij eerst in. B To AC IN Vers AC IN An AC IN A AC IN Naar AC IN To a wall outlet Vers une prise murale An eine Netzsteckdose A la toma de pared Naar een stopcontact AC power cord Cordon dalimentation sect

12、eur Netzkabel Cable de alimentacin de CA Netsnoer HOLDOPERATION LIGHT mb/CLOCK TIME SET ON/OFFSLEEP SCAN STANDBY TUNE/ TIME SET VOL TONE BAND1234567 PRESET TUNING STATION SELECT/ PRESET v jack Prise v Buchse v Toma v v aansluiting Telescopic Antenna Antenne tlescopique Teleskopantenne Antena telescp

13、ica Telescoopantenne TUNE/TIME SET VOL TONE C FMSWMW/LW CLOCK for ICF-M770L CLOCK pour ICF-M770L CLOCK beim ICF-M770L CLOCK para ICF-M770L CLOCK voor ICF-M770L *The PRESET TUNING 4 button has a tactile dot. * La touche PRESET TUNING 4 a un point tactile. *Auf der PRESET TUNING-Taste 4 befindet sich

14、ein fhlbarer Punkt. *La tecla PRESET TUNING 4 tiene un punto tctil. *De PRESET TUNING 4 toets is voorzien van een voelstip. * Setting the Clock “0:00” will flash in the display when the batteries are installed or the AC power cord is plugged in for the first time. The clock can be adjusted only when

15、 the radio is turned off. 1Press mb/CLOCK (CLOCK for ICF- M770L) for more than 2 seconds. The “hour” starts flashing. 2Turn TUNE/TIME SET to set the hour for the current time, then press mb/CLOCK (CLOCK for ICF-M770L). The “minute” starts flashing. 3Turn TUNE/TIME SET to set the minute for the curre

16、nt time, then press mb/ CLOCK (CLOCK for ICF-M770L). The clock starts operating, and “:” starts flashing. To set the current time exactly to the second, adjust the minute and then press mb/CLOCK (CLOCK for ICF-M770L) to synchronize with a time signal (such as the telephone time signal). How to Adjus

17、t the Time Digits When you turn TUNE/TIME SET to or , the time digits move forward or backward by one step, and when you turn it to or , the time digits move rapidly. Notes If you do not operate mb/CLOCK (CLOCK for ICF- M770L) or TUNE/TIME SET within 65 seconds, the clock setting mode will be cancel

18、led. 24-hour system : “0:00” = midnight, “12:00” = noon Using the Backlight Function Press LIGHT to turn on the backlight. To turn off the backlight, press LIGHT again. When operating the unit on batteries The backlight will turn off automatically after 30 seconds to save the batteries. However, if

19、you operate the radio while the backlight is lit, it will stay on for another 30 seconds. To turn off the backlight before the time has elapsed, press LIGHT. RadioFans.CN ICF-M770L/M770S/M770SL 4 This set can be disassembled in the order shown below. 3-1.DISASSEMBLY FLOW SECTION 3 DISASSEMBLY Note:

20、Follow the disassembly procedure in the numerical order given. 3-2.CABINET (REAR) ASSY 3telescopic antenna (ANT1) 2screw (P3 10) 1six screws (BTP3 14) 6cabinet (rear) assy 5Remove five solders. 4 main board main board SET 3-2. CABINET (REAR) ASSY (page 4) 3-4. MAIN BOARD (page 5) 3-3. CHASSIS ASSY (

21、page 5) RadioFans.CN ICF-M770L/M770S/M770SL 5 3-3.CHASSIS ASSY 3-4.MAIN BOARD 4chassis assy 1knob (jog) 2knob (control) (vol) 3knob (control) (tone) 5main board 4three claws 4claw 2claw 3key board 1two screws (P2 8) RadioFans.CN 6 ICF-M770L/M770S/M770SL no mark: common (): ICF-M770L : ICF-M770S : IC

22、F-M770SL AM IF ADJUSTMENT Adjust for a maximum reading on level meter T1450 kHz MW VT VOLTAGE ADJUSTMENT Adjustment PartFrequency DisplayReading on Digital Voltmeter (L8) L10531 kHz2.5 0.1 V 2.8 0.1 V Confirmation1,602 kHz9.6 1.0 V MW TRACKING ADJUSTMENT Adjust for a maximum reading on level meter (

23、L5-1) L5603 kHz (CT1) CT21,404 kHz LW VT VOLTAGE ADJUSTMENT Adjustment PartFrequency DisplayReading on Digital Voltmeter (CT3) L10153 kHz2.2 0.1 V 2.8 0.1 V Confirmation279 kHz8.6 1.0 V LW TRACKING ADJUSTMENT Adjust for a maximum reading on level meter (L5-2) L5162 kHz CT2243 kHz FM VT VOLTAGE ADJUS

24、TMENT Adjustment PartFrequency DisplayReading on Digital Voltmeter L1487.5 MHz2.9 1.0 V Confirmation108 MHz9.1 1.0 V FM TRACKING ADJUSTMENT Adjust for a maximum reading on level meter L12, 1387.5 MHz CT4108 MHz SW VT VOLTAGE ADJUSTMENT* Adjustment PartFrequency DisplayReading on Digital Voltmeter L8

25、5,800 kHz2.7 0.1 V Confirmation15,900 kHz9.1 1.0 V SW TRACKING ADJUSTMENT* Adjust for a maximum reading on level meter L35,800 kHz CT115,900 kHz *: ICF-M770S/M770SL Adjustment Location: MAIN board (See page 7) 0 dB=1 V MW/LW Setting: BAND switch: MW or LW FM Setting: BAND switch: FM SW (ICF-M770S/M7

26、70SL) Setting: BAND switch: SW Repeat the procedures in each adjustment several times, and the tracking adjustments should be finally done by the trimmer ca- pacitors. Remove FM/SW antenna in FM/SW adjustment. digital voltmeter 100 k MAIN board TP (VT) + AM RF signal generator 30% amplitude modulati

27、on by 400 Hz signal Output level: as low as possible + level meter set 32 11 pF MAIN board TP (ANT) JACK board v jack (J201) FM RF signal generator 22.5 kHz frequency deviation by 400 Hz signal Output level: as low as possible + level meter set 32 0.01 F MAIN board TP (ANT) JACK board v jack (J201)

28、AM RF signal generator 30% amplitude modulation by 400 Hz signal Output level: as low as possible Put the lead-wire antenna close to the set. + level meter set 32 JACK board v jack (J201) SECTION 4 ELECTRICAL ADJUSTMENTS RadioFans.CN ICF-M770L/M770S/M770SL 77 Adjustment Location: MAIN BOARD (Compone

29、nt Side) MAIN BOARD (Conductor Side) TP (VT) TP (ANT) CT1 MW Tracking Adjustment (M770L) L5-1 L13 L12FM Tracking Adjustment CT4 CT2MW Tracking Adjustment (M770S) L5LW Tracking Adjustment (M770SL) CT1 SW Tracking Adjustment (M770S/M770SL) L3 T1 AM IF Adjustment L14 FM VT Voltage Adjustment CT3 LW VT

30、Voltage Adjustment (M770L) L8 MW VT Voltage Adjustment (M770L) SW VT Voltage Adjustment (M770S/M770SL) L10 MW VT Voltage Adjustment (M770S) LW VT Voltage Adjustment (M770SL) CT2 LW Tracking Adjustment (M770L) L5-2 RadioFans.CN ICF-M770L/M770S/M770SL 88 SECTION 5 DIAGRAMS 5-1.BLOCK DIAGRAM 13 10 1518

31、 11 68 FM FRONT-END FM IF AMP AF POWER AMP AM IF AMP, AGC, DET AM FRONT-END 17 20 FM RF IN FM/AM IF OUT CF3 10.7MHz CF2 10.7MHz CF1 450kHz FM RF FM IF IN TUNING METER 28 AF OUT AF IN 2425 DET OUT AM IF IN METER NF VOL 1645 FM/AM BAND SELECT AM OSC L8 SW/MW OSC L10 MW/LW OSC L14 FM OSC L5 MW/LW FERRI

32、TE-ROD ANTENNA FM OSC AM RF IN L12, 13 FM RF FM/AM FRONT-END, FM/AM IF AMP, DET, AGC, AF AMP IC1 SYSTEM CONTROLLER, LIQUID CRYSTAL DISPLAY DRIVER, KEY CONTROL IC104 CT2 D2-1 Q6 MW/LW SWITCH MW/LW SWITCH Q4 MW/LW SWITCH Q7 CT3 CT4 RV1 VOL + L14 FM VT VOLTAGE D104, 105 (LCD BACK LIGHT) CT3 LW VT VOLTA

33、GE L10 LW VT VOLTAGE CT4, L12, 13 FM TRACKING T1 AM IFT T1 AM IF B.P.F. BPF1 LOW-PASS FILTER Q104, 110 SIGNAL PATH : FM : MW/LW D1-1 D6 D7 LIGHT 16 BEEP52 15 AM/(FM/TV) 56 EO 19 (MW/LW)/SW 4 BPF 3 MUTE 2 AC DET TUNED 14 VCOL 20 VCOH 2524 X101 75kHz XIN XOUT 17 HOLD LCD0 LCD12 21 COM0 COM3 KEY MATRIX

34、 S101 119 35 4731 34 KS0 KS4 1, 6 9 KR0 KR3 10 13 LIQUID CRYSTAL DISPLAY LCD101 (M770L) CT2, L5-2 LW TRACKING (M770L) CT1, L5-1 MW TRACKING (M770SL) CT2, L5 LW TRACKING (M770S) CT2, L5 MW TRACKING CT1 Q11, 12 TONE CONTROL SWITCH D1-2 (M770L) ANT1 FM/SW ANTENNA CF4 10.7MHz 3 FM DISCRIMINATOR FM DISCR

35、I SP1 J201 v MUTING SWITCH Q9 LED DRIVE Q107 D9 FM/(SW/MW/LW) BAND SELECT SWITCH Q10 FM VCO BUFFER Q8 FM VCO BUFFER Q105 M770S/ M770SL M770S/ M770SL SW SWITCH Q1 L3 SW RF FM/(SW/MW/LW) BAND SELECT SWITCH Q5 VCC B+ D2-2 SW SWITCH Q4 SW BAND SELECT SWITCH Q3 (M770L) M770S/ M770SL M770S/ M770SL S120 HO

36、LD OFF +3V B+ HOLD T202 POWER TRANSFORMER RECT D205, 206 J301 AC IN - AC DETECT Q201 AC DETECT Q103 DRY BATTERY SIZE D (IEC DESIGNATION R20) 4PCS. 6V D202 204 5 POWER D201 VCC B+ +3V B+ B+ SWITCH Q109 +3V REGULATOR IC101 DC/DC CONVERTER Q106, 111, T101 LOW-PASS FILTER CIRCUIT B+ D102 RV2 TONE REG OU

37、T 9 REG +1.2V 50 VDET1 51 CEDET BATTERY VOLTAGE DETECT IC102 53 VDET2 BATTERY VOLTAGE DETECT IC103 B+ SWITCH Q101 POWER ON/OFF CONTROL SWITCH Q102 FM/(SW/MW/LW) BAND SELECT SWITCH Q108 (M770L) L5-1 MW FERRITE-ROD ANTENNA L5-2 LW FERRITE-ROD ANTENNA REG +1.2V REG +1.2V REG +1.2V Q2 SW SWITCH VCC B+ (

38、M770L) M770S/ M770SL M770S/ M770SL M770S/ M770SL CT1, L3 LW TRACKING (M770SL) L10 MW VT VOLTAGE (M770S) L8 SW VT VOLTAGE (M770S/M770SL) L8 MW VT VOLTAGE (M770L) RadioFans.CN ICF-M770L/M770S/M770SL 99 Note on Printed Wiring Board: X : parts extracted from the component side. Y : parts extracted from

39、the conductor side. W: indicates side identified with part number. f: internal component. : Pattern from the side which enables seeing. (The other layers patterns are not indicated.) 5-2.NOTE FOR PRINTED WIRING BOARD AND SCHEMATIC DIAGRAMS Note on Schematic Diagram: All capacitors are in F unless ot

40、herwise noted. pF: F 50 WV or less are not indicated except for electrolytics and tantalums. All resistors are in and 1/4 W or less unless otherwise specified. f: internal component. C : panel designation. IC Block Diagram IC1CXA1019S 123456789101514131211 FM DISCRIMINATOR AF POWER AMPAM FEFM IF TUN

41、ING METER AM IF DET AGC FM FE 232221202425191817162928272630 GND GND AF OUT VCC RIPPLE FILTER AF IN DET OUT AFC AGC AFC AGC IF GND METER N.C FM IF IN AM IF IN FM/AM BAND SELECT FM/AM IF OUT FE GND N.C AM RF IN FM RF REG OUT FM OSC FM RF IN AFC AM OSC VOL NF FM DISCRI GND GND A : B+ Line. H : adjustm

42、ent for repair. Power voltage is dc 6 V and fed with regulated dc power supply from battery terminal. Voltages and waveforms are dc with respect to ground in no-signal (detuned) conditions. no mark : FM () : SW : MW : LW Voltages are taken with a VOM (Input impedance 10 M). Voltage variations may be

43、 noted due to normal produc- tion tolerances. Waveforms are taken with a oscilloscope. Voltage variations may be noted due to normal produc- tion tolerances. Circled numbers refer to waveforms. Signal path. F: FM f: MW/LW Note: The components identified by mark 0 or dotted line with mark 0 are criti

44、cal for safety. Replace only with part number specified. Circuit Boards Location jack board main board key board inlet board power board RadioFans.CN ICF-M770L/M770S/M770SL 1010 A K/A K D5 K A K D9 E CB Q12 E CB Q11 C55 C63 R30 C45 C57 E CB Q10 C38 C37 R28 R29 C34 C43 C52 C32 C58 R19 C28 C27 D7 KA C

45、61 R21 C29 R18 C25 C24 D6 KA R17 JC7 R22 R27 JC15 R15 R20 C50 C36 C65 E CB Q8 Q2 B C E R34 C3 R3 R7 E CB Q5 D8 AK R5 C1 R10 C4 Q1 GDS R1 R2 C5 C6 C10 C7 JC14 JC13 C12 C20 1A K 2A D1 C15 R11 R13 R12 JC8JC1 JC3 E CB Q4 JC11 C56 R31 C66 C64 JC10 E CB Q7 R25 R16 C67 C40 Q9 B C E R23 R24 C44 C46 C47 C30

46、C19 C21 C22 1A K 2A D2 R8 R14 C23 C11 C18 E CB Q3 R9 JW1 C54 + 1 5 JW2 L6 C48 + C42 + C51 + C41 + CF1 CF4 C35 + L14 JW5 JW4 CT4 L13 L12 BPF1 L16 L1 C8 + C33 + L15 JW16 L2 JW17 JW12 JW18 CT1 L7 L3 JW15 JW14 JW13 CT2 L10 RV1 JW20 JW19 JW21 L8 L9 L11 JW22 JW6 JW9 JW7 115 JW11 JW8 C62 + JW3 T1 CF3 CF2 IC1 MAIN BOARD (11) 11 1-684-571- 15 1 16 30 R33 R32 JC5 (M770L) JC6 (M770L) R6 E CB Q6 C13 C73 (M770L) (M770L) (M770S/M770SL) C59 (M770L) (M770SL) M770S/ M770SL M770S/ M770SL M770S/ M770SL VOL RV2 TONE JW10 JC4 JC2 C2 C17 C14C16 (M770L) CT3 M770S/ M770SL M770S/ M770SL (M770L) A KEY BO