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STR-SE381

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3-7.

SCHEMATIC DIAGRAM — MAIN (1/3) SECTION —

• See page 27 for IC Block Diagrams.

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Summary of Contents for STR-SE381

Page 1: ...MD VIDEO INPUT 10 Hz 50 kHz 1 dB Inputs Sensitivity Impedance S N weighting network input level PHONO MM 2 5 mV 50 Kilohms 72 dB A 2 5 mV CD 400 mV TAPE MD 250 mV TV DBS 50 Kilohms 82 dB VIDEO A 150 mV 78 IHF Outputs TAPE MD REC OUT Voltage 150 mV Impedance 10 kilohms VIDEO AUDIO OUT Voltage 150 mV Impedance 10 kilohms PHONES Accepts low and high impedance headphones Muting Full mute BASS BOOST 10...

Page 2: ...N 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 PUBLISHED BY SONY After correcting the original service problem perform the following safety checks before releasing the set to the customer Check the antenna terminals metal trim metallized knobs screws and all o...

Page 3: ...MD FUNCTION button 0 MASTER VOLUME control BALANCE control TREBLE control BASS control BASS BOOST button indicator SURROUND ON OFF button MODE button SET UP button EFFECT DELAY TIME button ª PHONO FUNCTION button º TUNER FUNCTION button CD FUNCTION button DIRECT button SHIFT button Numeric buttons PRESET TUNING buttons MEMORY button AM button FM button ª FM MODE button º TUNING buttons PHONES jack...

Page 4: ... 4 REAR PANEL 1 y SIGNAL GND 2 AC OUTLET 3 AC power cord 4 FRONT SPEAKERS A B 5 SURROUND SPEAKERS CENTER 6 SURROUND SPEAKERS REAR 7 VIDEO 8 TV DBS 9 TAPE MD º CD PHONO ANTENNA AM FM 1 2 º 9 5 4 3 7 6 8 ...

Page 5: ...While depressing the SURROUND button press the power I u button to turn on the main power Either the message NORMAL or GAIN UP appears When the product enters this mode again the other gain appears Select the desired gain SECTION 3 DIAGRAMS 3 1 CIRCUIT BOARDS LOCATION Waveforms For schematic diagrams Note All capacitors are in µF unless otherwise noted pF µµF 50 WV or less are not indicated except...

Page 6: ...C203 C 9 Q201 A 10 Q202 A 10 Q231 B 1 Semiconductor Location DISPLAY BOARD KEY BOARD A TO VOLUME BOARD CNP202 Page 11 H TO MAIN BOARD CNS204 Page 15 16 4 1 4 1 DIRECT VIDEO PHONO SHIFT 2 1 3 4 6 7 8 9 0 5 1 665 268 11 12 EFFECT DELAY TIME SET UP MODE SURROUND ON OFF 1 1 9 7 E 1 80 24 25 65 64 40 41 IC201 1 2 5 14 17 31 34 35 HALL C STUDIO PRO LOGIC REMOTE SENSOR REAR LEVEL CENTER LEVEL POWER E E 1...

Page 7: ...STR SE381 9 10 3 3 SCHEMATIC DIAGRAM DISPLAY SECTION See page 6 for Waveforms See page 25 for IC Pin Functions See page 27 for IC Block Diagrams ...

Page 8: ...BOARD CN706 Page 16 S701 SPEAKERS S701 1 A S701 2 B VR TONE BOARD VOLUME BOARD M MASTER VOLUME F TO MAIN BOARD CNS301 Page 15 TO MAIN BOARD CNS701 Page 15 A G TO DISPLAY BOARD CNS202 Page 7 1 4 5 8 E E RV404 BASS BASS BOOST TREBLE BALANCE 1 7 16 1 2 A B C D E F G 3 4 5 6 7 8 9 10 11 12 1 2 A B C D E F G 3 4 5 6 7 8 9 10 11 12 Ref No Location D238 C 2 D421 F 1 IC404 F 3 Q401 E 3 Q402 F 2 Q451 F 3 Q...

Page 9: ...STR SE381 13 14 3 5 SCHEMATIC DIAGRAM VOLUME SECTION See page 7 for KEY Board Wiring Board ...

Page 10: ...8 23 11 10 5 1 4 3 3 E 1 1 4 5 8 21 22 42 E E E E E E E E 1 15 14 2 16 1 2 A B C D E F G H I 3 4 5 6 7 8 9 10 11 12 1 2 A B C D E F G H I 3 4 5 6 7 8 9 10 11 12 Ref No Location D610 C 6 D710 H 10 D721 F 5 D722 F 5 D723 G 5 D724 G 5 D725 G 5 D801 G 5 D802 E 10 D804 H 6 D810 B 11 D811 B 11 D812 B 11 D813 B 11 D814 B 11 D815 B 11 D817 E 5 D818 C 11 D820 C 11 D821 C 11 D822 C 10 D823 C 10 D901 H 2 IC3...

Page 11: ...STR SE381 17 18 3 7 SCHEMATIC DIAGRAM MAIN 1 3 SECTION See page 27 for IC Block Diagrams ...

Page 12: ...A B C D E F G 3 4 5 6 7 8 9 10 11 12 13 STANDBY BOARD AC OUTLET SECONDARY BOARD B TO MAIN BOARD CN801 Page 16 PRIMARY BOARD 1 665 274 1 665 273 1 665 272 11 12 11 12 11 12 T901 POWER TRANSFORMER T902 C TO MAIN BOARD CNS802 Page 16 AC IN 1 1 11 4 16 CNP903 CN902 ...

Page 13: ...STR SE381 21 22 3 9 SCHEMATIC DIAGRAM MAIN 2 3 POWER SECTION See page 27 for IC Block Diagrams ...

Page 14: ...STR SE381 23 24 3 10 SCHEMATIC DIAGRAM MAIN 3 3 SP SW SECTION See page 12 for SW Board Wiring Board See page 27 for IC Block Diagrams ...

Page 15: ...nd Relay Power relay drive Not used A D signal input terminal A D3 key input terminal A D2 key input terminal A D1 key input terminal Power supply 5V Reference voltage 5V Ground Not used Open Ground System clock 4 19MHz System clock 4 19MHz Mute drive output for µPD2581V IC701 Prologic LED drive CINEMA STUDIO LED drive Hall LED drive Tuner mute drive output Pin Name DIG7 DIG6 DIG5 DIG4 DIG3 DIG2 D...

Page 16: ... signal input from NJM2103D IC950 Ground Sircs signal input Power switch input terminal 5 1ch input LED Power supply 5V Bass boost LED drive Line mute drive Surround Lch mute Input for model select Key in 4 Key in 3 Key in 2 Key in 1 Surround Rch mute Key out 1 Key out 2 Key out 3 Key out 4 Connect to 24V Fluorescent indicator tube drive Pin Name VOLUME UP VOLUME DOWN STANDBY SYS POWER RDS DATA IN...

Page 17: ...15 10 11 12 13 14 16 21 18 19 25 17 24 22 23 20 34 32 33 29 30 35 28 31 27 26 36 40 39 38 37 41 42 NOISE FILTER NOISE CH BALANCE CONTROL VR CONTROL LPF V REF VR VR NOISE GENERATOR VCA VCA VCA VCA VCA VCA VCA VCA LPF LPF RECT RECT RECT RECT P S P S CMODE MUTE DIVIDER OSC CONTROL CTRIM LOG DIFF LOG DIFF DUAL T CONTROL L IN R IN V SS CLK DATA V CC L OUT R OUT S OUT C OUT ENABLE OSC1 CMODE CAP C TRIM ...

Page 18: ... SHIFT CL DI CE VEE OUT IN OUT IN OUT IN VSS S RESET VDD OUT IN IN OUT IN OUT IN 2 3 5 4 6 7 9 8 1 MUTE VOUT1 VOUT1 COMP1 MF1 IN1 GND IN2 NF2 COMP2 VOUT2 VOUT2 VCC1 VCC2 VEE PROTECTOR BIAS CIRCUIT REG DRIVE PRE DRIVE 11 10 12 13 15 14 DRIVE PRE DRIVE 1 2 3 4 5 6 7 8 9 NC OUTPUT 2 Vcc GND NC INPUT 2 INPUT 1 NC MOTOR DRIVE MOTOR DRIVE REG SWITCH SWITCH OUTPUT1 ...

Page 19: ...9 4 1 FRONT PANEL SECTION Ref No Part No Description Remarks Ref No Part No Description Remarks SONY a a 8 7 8 6 5 5 16 18 2 1 14 11 12 13 13 9 10 8 18 FL201 1 1 1 13 1 3 17 VOLUME board Including in 14 1 4 980 639 01 KNOB R14 2 X 4946 873 1 KNOB R48 ASSY 3 X 4949 646 1 FRONT PANEL ASSY 5 4 921 941 01 CUSHION FL 6 4 943 107 11 HOLDER FL TUBE 7 4 980 658 01 CASE 413226 8 3 710 901 11 SCREW TAPPING ...

Page 20: ...5 273 11 PRIMARY BOARD 55 1 665 274 11 SECONDARY BOARD 56 1 665 272 11 STANDBY BOARD 57 A 4407 426 A MAIN BOARD COMPLETE 58 3 703 244 00 BUSHING 2104 CORD 59 4 997 684 01 BACK PANEL 62 X 4947 208 1 FOOT ASSY F50150S 63 4 924 098 01 HOLDER PC BOARD 64 4 812 134 00 RIVET DIA 3 5 NYLON 65 4 954 051 51 HOLDER PC BOARD 70 3 905 609 01 SCREW TRANSISTOR 71 1 777 070 21 CORD POWER CNJ903 1 251 698 11 OUTL...

Page 21: ...ODE 1SS119 D235 8 719 313 50 DIODE SEL6810A TH12 D236 8 719 313 50 DIODE SEL6810A TH12 D237 8 719 313 50 DIODE SEL6810A TH12 FILTER FL201 1 517 141 11 INDICATOR TUBE FLUORESCENT IC IC201 8 759 479 19 IC uPD78044FGF 064 3B9 IC202 8 759 962 08 IC BA6208 IC203 8 759 332 18 IC GP1U27XB REMOTE SENSOR COIL L401 1 410 509 11 INDUCTOR 10uH TRANSISTOR Q201 8 729 900 63 TRANSISTOR DTA124ES Q202 8 729 900 36...

Page 22: ...38 1 762 378 11 SWITCH TACTILE MODE S239 1 762 378 11 SWITCH TACTILE CD A 4407 426 A MAIN BOARD COMPLETE 3 905 609 01 SCREW TRANSISTOR 4 812 134 00 RIVET DIA 3 5 NYLON 7 685 872 09 SCREW BVTT 3 8 S CAPACITOR C302 1 126 934 11 ELECT 220uF 20 16V C303 1 130 494 11 MYLAR 0 082uF 5 50V C304 1 137 367 11 FILM 0 0033uF 5 50V C305 1 130 494 11 MYLAR 0 082uF 5 50V C306 1 126 959 11 ELECT 0 47uF 20 50V C30...

Page 23: ...25 11 ELECT 470uF 20 10V C743 1 126 925 11 ELECT 470uF 20 10V C752 1 162 282 31 CERAMIC 100PF 10 50V C753 1 104 665 11 ELECT 100uF 20 10V C755 1 102 233 00 CERAMIC 33PF 10 500V C760 1 126 967 11 ELECT 47uF 20 16V C761 1 137 372 11 FILM 0 022uF 5 50V C770 1 162 286 31 CERAMIC 220PF 10 50V C801 1 104 664 11 ELECT 47uF 20 25V C802 1 104 664 11 ELECT 47uF 20 25V C803 1 128 493 11 ELECT 4700uF 20 63V C...

Page 24: ...C3623A LK Q753 8 749 010 25 IC MN2488 OPY M Q754 8 749 010 26 IC MP1620 OPY M Q770 8 729 140 82 TRANSISTOR 2SA988 PAFAEA Q801 8 729 140 97 TRANSISTOR 2SB734 34 Q802 8 729 620 05 TRANSISTOR 2SC2603 EF Q808 8 729 180 92 TRANSISTOR 2SD809 K Q809 8 729 620 05 TRANSISTOR 2SC2603 EF Q951 8 729 026 68 TRANSISTOR 2SD2525 TP Q951 8 729 209 15 TRANSISTOR 2SD2012 RESISTOR R298 1 249 387 11 CARBON 3 3 5 1 4W ...

Page 25: ...RBON 680 5 1 4W F R704 1 249 439 11 CARBON 68K 5 1 4W R705 1 249 441 11 CARBON 100K 5 1 4W R710 1 249 421 11 CARBON 2 2K 5 1 4W F R711 1 249 440 11 CARBON 82K 5 1 4W R713 1 249 414 11 CARBON 560 5 1 4W F R714 1 249 408 11 CARBON 180 5 1 4W F R715 1 249 408 11 CARBON 180 5 1 4W F R716 1 233 352 21 ENCAPSULATED COMPONENT R717 1 249 393 11 CARBON 10 5 1 4W F R718 1 249 389 11 CARBON 4 7 5 1 4W F R719...

Page 26: ...ARD 5P CNP704 1 764 473 11 PIN CONNECTOR PC BOARD 3P JACK J741 1 750 731 11 JACK LARGE TYPE PHONES RESISTOR R741 1 247 753 11 CARBON 1 2K 5 1 2W R742 1 247 753 11 CARBON 1 2K 5 1 2W R791 1 247 753 11 CARBON 1 2K 5 1 2W R792 1 247 753 11 CARBON 1 2K 5 1 2W SWITCH S701 1 762 319 11 SWITCH PUSH 2 KEY SPEAKERS A 4407 429 A VR TONE BOARD COMPLETE CAPACITOR C420 1 162 207 31 CERAMIC 22PF 5 50V C421 1 13...

Page 27: ...5 11 CARBON 680 5 1 4W F R471 1 249 430 11 CARBON 12K 5 1 4W R472 1 249 422 11 CARBON 2 7K 5 1 4W F R473 1 247 903 00 CARBON 1M 5 1 4W R474 1 247 903 00 CARBON 1M 5 1 4W R475 1 249 429 11 CARBON 10K 5 1 4W R476 1 249 439 11 CARBON 68K 5 1 4W R477 1 249 417 11 CARBON 1K 5 1 4W F R480 1 249 437 11 CARBON 47K 5 1 4W R481 1 247 843 11 CARBON 3 3K 5 1 4W R482 1 247 883 00 CARBON 150K 5 1 4W R483 1 249 ...

Page 28: ... No Description Remarks Ref No Part No Description Remarks 38 STR SE381 Sony Corporation Home A V Products Company 9 922 830 11 98D167021 1 Printed in Singapore 1998 4 Published by Quality Assurance Dept Shibaura ...

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