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Sony ICF-M770L, Service Manual

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Sony ICF-M770L Service Manual Download Page 24

ICF-M770L/M770S/M770SL

REVISION  HISTORY

Clicking the version allows you to jump to the revised page.
Also, clicking the version at the upper right on the revised page allows you to jump to the next revised
page.

Ver.

Date

Description of Revision

1.0

2002.03

New

1.1

2002.06

Addition of East European model (ICF-M770S)

(ENG-02024)

Summary of Contents for ICF-M770L

Page 1: ...Band ICF M770L ICF M770S ICF M770SL Channel step FM 87 5 87 5 87 5 0 05 MHz 108 MHz 108 MHz 108 MHz SW 5 800 5 800 5 kHz 15 900 kHz 15 900 kHz MW 531 531 9 kHz 1 602 kHz 1 602 kHz LW 153 153 9 kHz 279 kHz 279 kHz Speaker 12 cm 43 4 inches 8 Ω Power output 350 mW at 10 harmonic distortion Output v earphone jack ø 3 5 mm minijack Power requirements 220 230 V AC 50Hz 6 V DC four R20 size D batteries ...

Page 2: ...PONENT 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 chip component replacement Never reuse a disconnected chip component Notice that the minus side of a tantalum ...

Page 3: ...s 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 the radio is turned off 1 Press mb CLOCK CLOCK for ICF M770L for more than 2 seconds The hour starts flashing 2 Turn TUNE TIME SET to set the hour for the current time then press mb CLOCK CLOCK for...

Page 4: ... 3 DISASSEMBLY Note Follow the disassembly procedure in the numerical order given 3 2 CABINET REAR ASSY 3 telescopic antenna ANT1 2 screw P3 10 1 six screws BTP3 14 6 cabinet rear assy 5 Remove 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 page 5 ...

Page 5: ...ICF M770L M770S M770SL 5 3 3 CHASSIS ASSY 3 4 MAIN BOARD 4 chassis assy 1 knob jog 2 knob control vol 3 knob control tone 5 main board 4 three claws 4 claw 2 claw 3 key board 1 two screws P2 8 ...

Page 6: ...ency Display Reading on Digital Voltmeter L8 5 800 kHz 2 7 0 1 V Confirmation 15 900 kHz 9 1 1 0 V SW TRACKING ADJUSTMENT Adjust for a maximum reading on level meter L3 5 800 kHz CT1 15 900 kHz ICF M770S M770SL Adjustment Location MAIN board See page 7 0 dB 1 µV MW LW Setting BAND switch MW or LW FM Setting BAND switch FM SW ICF M770S M770SL Setting BAND switch SW Repeat the procedures in each adj...

Page 7: ...ment CT4 CT2 MW Tracking Adjustment M770S L5 LW Tracking Adjustment M770SL CT1 SW Tracking Adjustment M770S M770SL L3 T1 AM IF Adjustment L14 FM VT Voltage Adjustment CT3 LW VT 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 ...

Page 8: ...LAY 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 DISCRI 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 ...

Page 9: ...25 19 18 17 16 29 28 27 26 30 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 adjustment for repair Power voltage is dc 6 V and fed with regulated dc power supply from battery terminal Voltages and waveforms are dc with re...

Page 10: ...3 M770L M770L M770S M770SL C59 M770L M770SL M770S M770SL M770S M770SL M770S M770SL VOL RV2 TONE JW10 JC4 JC2 C2 C17 C14 C16 M770L CT3 M770S M770SL M770S M770SL M770L A KEY BOARD TP VT 1 2 3 M770S M770SL TP ANT ANT1 L5 MW LW FERRITE ROD ANTENNA A B C D E F G H I 1 2 3 4 5 6 7 8 9 10 I 1 4 INLET BOARD 11 11 1 684 567 D201 A K D202 A K D203 A K D204 A R202 C207 R201 R203 C206 C205 C202 Q201 1 5 C204 ...

Page 11: ...3p 10p 8 FM OSC RF GND 7 9 AM OSC 10 AC DETEC 6 VT SCAN TUNE 5 11 BEEP 12 GND 14 15 13 UCOM DC 6VCOM VCC 4 LW L MW L SW H 3 FM H SW MW LW L 2 MUTE 1 UCOM DC 6VCOM AC DETEC SP GND G O I 4 5 3 1 2 FM AM IF OUT FE G N D FM RF IN N C AM RF IN FM R F REG O U T FM OSC AFC AM OSC VOL N F FM DISCRI G N D G N D G N D G N D AF O U T VCC RIPPLE FILTER AF IN DET O U T AFC AGC IF G N D AFC AGC METER N C FM IF ...

Page 12: ...104 S105 S107 S108 D105 D104 JW131 S114 JW127 JW128 JW130 JW129 S115 L102 C129 C146 T101 S111 L103 C151 C105 S113 15 1 JW119 JW120 JW115 JW114 JW113 JW121 JW122 JW123 JW124 JW125 JW126 JW132 JW133 JW134 L101 JW111 JW112 JW109 JW110 JW108 JW107 JW106 JW105 S117 S119 S118 S116 JW117 JW116 S109 S120 JW103 JW102 JW101 JW104 S106 JW135 LCD101 LIQUID CRYSTAL DISPLAY KEY BOARD 11 11 1 684 570 5 4 1 3 A M...

Page 13: ... 680 680 680 680 1000p 0 33 10k 100k 1k 1000 6 3V 1M 4 7k 47k 10k 470 10k 10 1SS355 10k 10k 10k 10k 10k 47k 0 1 1k 4 7k 0 1 0 1 100k 100k 1M 1M 1k S 80842ANNP S 80836ANNP 1SS355 1k 100 47k 47 1SS355 10k 10k 10k 10k 10k 10k 10k 10k 10k 10k 10k 1k 100p 10 16V 0 01 1k 1k 1k 1k 10k 1k 10k DTC144TUA 2SC4098 10p 2SC4081 2SC4081 3 3mH 75KHz 2SC4081 1 UDZ TE17 13 100k 100k 100k 100k 4 7k S 81230SG QB T1 2...

Page 14: ...ulator output terminal for the PLL 23 VDD Power supply terminal 3V 24 XOUT O System clock output terminal 75 kHz 25 XIN I System clock input terminal 75 kHz 26 REG1 O Voltage regulator output terminal for the oscillator circuit 27 REGLCD0 Connection terminal of doubler circuit capacitor for liquid crystal display drive power supply 28 CAPLCD0 Connection terminal of doubler circuit capacitor 29 CAP...

Page 15: ... Description Remark 1 3 237 047 01 PANEL M770SL 1 3 237 047 11 PANEL M770S 1 3 237 047 21 PANEL M770L 2 3 237 052 01 PLATE TRANSPARENT 3 3 237 061 01 NET SPEAKER 4 3 237 057 01 KNOB HOLD 5 4 925 334 41 EMBLEM 5 A SONY 6 3 237 062 01 SHEET SPEAKER 7 3 237 048 01 BUTTON PRESET 8 3 014 055 01 FOOT RUBBER 9 3 013 190 01 SPRING JOG RING 10 3 237 049 01 KNOB JOG 11 3 237 050 01 KNOB CONTROL VOL 12 3 237...

Page 16: ...R 60 3 237 054 01 HANDLE 61 3 237 065 01 TERMINAL BATTERY 62 3 237 022 01 CABINET REAR 63 3 237 063 01 TERMINAL BATTERY 64 3 244 251 01 CUSHION A 65 3 880 474 01 CUSHION 15X5X0 3 ANT1 1 501 321 51 ANTENNA TELESCOPIC 0T202 1 435 614 11 TRANSFORMER POWER 4 7 682 149 13 SCREW P 3X10 5 7 685 102 19 SCREW P 2X4 TYPE2 NON SLIT 6 7 685 134 19 SCREW P 2 6X8 TYPE2 NON SLIT 51 52 53 54 65 55 63 64 64 61 62 ...

Page 17: ...48 A MAIN BOARD COMPLETE M770SL 105 A 3021 854 A MAIN BOARD COMPLETE M770S 105 A 3021 876 A MAIN BOARD COMPLETE M770L 106 3 237 023 01 CHASSIS 107 3 010 281 01 SPACER B 108 3 244 087 01 SHEET A 109 3 559 407 01 CUSHION STOPPER L5 1 428 955 11 COIL FERRITE ROD ANTENNA MW M770S L5 1 428 956 11 COIL FERRITE ROD ANTENNA M770L L5 1 501 954 21 ANTENNA FERRITE ROD LW M770SL LCD101 1 804 671 11 DISPLAY PA...

Page 18: ...Y BOARD COMPLETE M770S A 3021 877 A KEY BOARD COMPLETE M770L 3 010 281 01 SPACER B 3 237 051 01 HOLDER LCD CAPACITOR C104 1 162 970 11 CERAMIC CHIP 0 01uF 10 25V C105 1 104 396 11 ELECT 10uF 20 16V C106 1 162 927 11 CERAMIC CHIP 100PF 5 50V C108 1 164 156 11 CERAMIC CHIP 0 1uF 25V C109 1 164 156 11 CERAMIC CHIP 0 1uF 25V C113 1 115 156 11 CERAMIC CHIP 1uF 10V C115 1 162 968 11 CERAMIC CHIP 0 0047u...

Page 19: ...0W R113 1 216 833 11 METAL CHIP 10K 5 1 10W R114 1 216 845 11 METAL CHIP 100K 5 1 10W M770L M770S R115 1 216 845 11 METAL CHIP 100K 5 1 10W M770L R116 1 216 845 11 METAL CHIP 100K 5 1 10W M770SL R117 1 216 845 11 METAL CHIP 100K 5 1 10W M770S M770SL R118 1 216 821 11 METAL CHIP 1K 5 1 10W R120 1 216 825 11 METAL CHIP 2 2K 5 1 10W R121 1 216 833 11 METAL CHIP 10K 5 1 10W R122 1 216 833 11 METAL CHI...

Page 20: ...KEY BOARD 7 S109 1 771 906 11 SWITCH KEY BOARD OPERATION S110 1 771 906 11 SWITCH KEY BOARD SLEEP S111 1 771 906 11 SWITCH KEY BOARD CLOCK M770L S111 1 771 906 11 SWITCH KEY BOARD mb CLOCK M770S M770SL S112 1 771 906 11 SWITCH KEY BOARD SCAN S113 1 771 906 11 SWITCH KEY BOARD STANDBY ON OFF S114 1 771 906 11 SWITCH KEY BOARD LIGHT S115 1 771 906 11 SWITCH KEY BOARD STANDBY TIME SET S116 1 786 267 ...

Page 21: ... 0 022uF 10 25V C67 1 164 227 11 CERAMIC CHIP 0 022uF 10 25V C73 1 162 907 11 CERAMIC CHIP 2PF 0 25PF 50V M770L CERAMIC FILTER CF1 1 578 677 21 FILTER CRYSTAL 450kHz M770L CF1 1 795 323 11 FILTER CERAMIC 450kHz M770S M770SL CF2 1 567 390 11 FILTER CERAMIC 10 7MHz CF3 1 567 390 11 FILTER CERAMIC 10 7MHz CF4 1 567 050 00 FILTER CERAMIC 10 7MHz TRIMMER CT1 1 141 601 11 CAP ADJ 10PF CT2 1 141 622 11 C...

Page 22: ...6 833 11 METAL CHIP 10K 5 1 10W R16 1 216 837 11 METAL CHIP 22K 5 1 10W M770S M770SL R17 1 216 845 11 METAL CHIP 100K 5 1 10W R18 1 216 845 11 METAL CHIP 100K 5 1 10W R19 1 216 827 11 METAL CHIP 3 3K 5 1 10W R20 1 216 821 11 METAL CHIP 1K 5 1 10W R21 1 216 837 11 METAL CHIP 22K 5 1 10W R22 1 216 815 11 METAL CHIP 330 5 1 10W R23 1 216 821 11 METAL CHIP 1K 5 1 10W R24 1 216 829 11 METAL CHIP 4 7K 5...

Page 23: ...23 ICF M770L M770S M770SL MEMO ...

Page 24: ... allows you to jump to the revised page Also clicking the version at the upper right on the revised page allows you to jump to the next revised page Ver Date Description of Revision 1 0 2002 03 New 1 1 2002 06 Addition of East European model ICF M770S ENG 02024 ...

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