Sony ST-SB920 Service Manual Download Page 7 | Manualshive

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— 7 —

AM SECTION

AM Meter Level Adjustment

Setting:
BAND : LW

Procedure:
1. Set AM RF signal generator so that the AM antenna input level

becomes 74dBµ/m.

2. Adjust RV402 so that 1 to 10 indication bars light up on the

signal meter.

Adjustment Location

[TUNER BOARD] — Component Side —

AM RF SSG

loop antenna

set

loop antenna
(Supplied accessories)

60 cm

AM antenna
terminal (TM1)

30% amplitude
modulation by
400 Hz signal

Carrier frequency : 216kHz
Modulation : AUDIO 400Hz, 30% modulation

Field strength dB (

µ

V/m) =SSG output level dB (

µ

V/m) –26 dB.

FE101

RV402

AM Meter Level

RV251

Stereo Level

RV221

FM Meter Level

RV231
Narrow Gain

IFT252
(NULL)

TP251 (NULL)

RV301

Stereo

Separation

IFT253

(THD)

IFT252, 253

FM Discriminator

CNP702

1

8

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Summary of Contents for ST-SB920

Page 1: ...kHz Selectivity at 400 kHz WIDE 85 dB NARROW 90 dB at 300 kHz WIDE 45 dB NARROW 70 dB Output at 40 kHz deviation 600 mV AM tuner section Frequency range MW 522 1 611 kHz 9 kHz step LW 144 288 kHz 1 kHz step Intermediate frequency 450 kHz Usable Sensitivity with AM loop aerial MW 200 µV m LW 700 µV m Signal to noise ratio MW 54 dB 50 mV m 999 kHz LW 50 dB 50 mV m 216 kHz Harmonic distortion 0 3 50 ...

Page 2: ...NTS IDENTIFIED BY MARK OR DOTTED LINEWITH MARK 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 PUBLISHED BY SONY PARTS No MODEL MODEL IDENTIFICATION BACK PANEL 4 998 494 0π 4 998 494 1π AEP model UK model yyyyyyyy PART NO 1 POWER swtich U 2 SHIFT button 3 Nume...

Page 3: ...ustments IC801 NG DISPLAY NOTE The preset data will be erased when this test mode is used Therefore take down the data before setting this mode and preset the data again after completing operations in this mode 2 Display Tube Check and KEY Check mode 1 Turn OFF the power 2 While pressing 1 and AUTO BETICAL SELECT together turn ON U 3 While continuously pressing 1 and AUTO BETICAL SELECT together c...

Page 4: ...to 4 Forced RESET 1 Turn OFF the power 2 While pressing 3 and AUTO BETICAL SELECT together turn ON U 4 Forced RESET Used to delete the contents of Factory Preset when it is written into the preset memory Clears all the RAMs and sets the initial state 1 Turn OFF the power 2 While pressing 5 and AUTO BETICAL SELECT together turn ON U 3 When All clear is indicated on the display tube it means that Fo...

Page 5: ...he test modes 2 Display Tube Check and KEY Check mode or 3 Entering the Factory Preset IF NARROW and IF WIDE are switched every time pressing RETURN button the IF BAND NARROW is set NARROW is indicated on the fluorescent display tube Likewise the mode can be switched between ANT ATT ON and ANTATT OFF When set toANTATT ON the fluorescent display tube indicates ANT ATT FM SECTION 0dB 1µV set FM RF S...

Page 6: ... 70dB set FM RF SSG FM ANTENNA 75Ω Modulation Stereo Standard signal Output level 18µV 25dB at 75 Ω open set FM RF SSG FM ANTENNA 75Ω Modulation Stereo Standard signal Output level 18µV 25dB at 75 Ω open set FM RF SSG FM ANTENNA 75Ω Modulation Stereo Standard signal Output level 3mV 76dB at 75 Ω open Stereo Separation Adjustment Setting IF BAND WIDE Procedure 1 Refer to How to switch IF BAND WIDE ...

Page 7: ...BOARD Component Side AM RF SSG loop antenna set loop antenna Supplied accessories 60 cm AM antenna terminal TM1 30 amplitude modulation by 400 Hz signal Carrier frequency 216kHz Modulation AUDIO 400Hz 30 modulation Field strength dB µV m SSG output level dB µV m 26 dB FE101 RV402 AM Meter Level RV251 Stereo Level RV221 FM Meter Level RV231 Narrow Gain IFT252 NULL TP251 NULL RV301 Stereo Separation...

Page 8: ...es seeing Note The components identified by mark or dotted line with mark are critical for safety Replace only with part number specified Indication of transistor C These are omitted E B IC701 X2 2 5 2 Vp p 4 19MHz 4 332MHz IC801 OSC1 1 3 6 Vp p THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS In addition to this the necessary note is printed in each block For schematic diagram...

Page 9: ...ST SB920 9 10 4 2 SCHEMATIC DIAGRAM DISPLAY SECTION See page 8 for Waveforms See page 19 for IC Pin Function ...

Page 10: ...9 11 11 11 11 AC IN SHIFT DISPLAY PTY TA MEMORY BAND ON OFF ANTENNA FM MODE CHARACTER MENU ENTER RETURN DIRECT TUNING SELECT TUNING MODE NEWS INFO AUTO BETICAL SELECT 0 9 8 7 6 2 3 4 5 1 16 S901 1 2 CN951 1 2 1 2 ECP900 1 5 1 2 3 1 1 8 9 1 1 100 3 30 31 50 51 80 81 FL701 FLUORESCENT INDICATOR TUBE 1 2 A B C D E F G 3 4 5 6 7 8 9 10 11 12 13 14 Semiconductor Location Ref No Location D701 C 13 D702 ...

Page 11: ...E 1 7 1 1 1 22 11 12 4 5 8 2 3 R L CNJ301 ANTENNA FM 750 COAXIAL A B TM401 FE401 AM FRONT END IFT 252 IFT252 THD IFT253 IFT 253 1 2 A B C D E F G H I 3 4 5 6 7 8 9 10 11 12 13 Semiconductor Location Ref No Location D221 H 3 D251 H 9 D301 C 11 D371 B 12 D401 C 4 D402 E 4 D901 C 8 D902 C 8 D903 C 7 D904 C 7 D905 D 7 D906 H 12 D907 D 7 D908 C 8 IC221 H 2 IC251 H 7 IC301 D 11 IC302 C 10 IC401 D 5 IC80...

Page 12: ...ST SB920 15 16 4 5 SCHEMATIC DIAGRAM TUNER SECTION 1 2 See page 20 for IC Block Diagrams ...

Page 13: ...ST SB920 17 18 4 6 SCHEMATIC DIAGRAM TUNER SECTION 2 2 See page 8 for Waveforms See page 20 for IC Block Diagrams BUFFER ...

Page 14: ...sed Open Not used Open Not used Open Not used Open Not used Open System reset input Oscillation signal output 4 19MHz Oscillation signal input 4 19MHz Ground Not used Open Lock signal input Power supply 5V PLL clock to FE101 PLL data to FE101 PLL data from FE101 PLL Latch to FE101 Not used Open Stereo display detection Not used Open Auto stop signal detection Ground Analog Muting signal output Ext...

Page 15: ...14 13 12 2 3 4 5 6 7 8 9 10 11 AM B VCO MUTE ST FM L R FM AM 1 2 3 4 REG GND CONTROL REG 5 6 7 4 8 IC BLOCK DIAGRAMS TUNER BOARD IC301 LA3401 IC901 LA5667 IC401 LA1245 IC221 IC251 LA1235 QUALITY BIT GENERATOR DEFFERENTIAL DECODER BIPHASE SYMBOL DECODER OSCILLATOR AND DIVIDER 57kHz BANDPASS 8th ORDER CONTAS LOOP VARIABLE AND FIXED DIVIDER REFERENCE VOLTAGE ANTI ALIASING FILTER CLOCKED COMPARATOR TE...

Page 16: ...r specified 21 When indicating parts by reference number please include the board name 5 1 FRONT PANEL AND CASE SECTION Ref No Part No Description Remarks 1 X 4949 523 1 FOOT ASSY F50180S 2 4 970 124 01 CUSHION F50180S 3 3 703 353 06 SUPPORT PC BOARD 4 A 4407 370 A TUNER BOARD COMPLETE 5 3 710 901 01 SCREW TAPPING SILVER 5 3 710 901 11 SCREW TAPPING BLACK 6 4 998 495 01 CASE 407026 BLACK 6 4 998 4...

Page 17: ...ATION TUBE 60 A 4407 371 A DISPLAY BOARD COMPLETE 62 4 998 485 01 HINGE BLACK Ref No Part No Description Remarks 62 4 998 485 11 HINGE SILVER 63 4 998 488 01 BUTTON C BLACK 63 4 998 488 11 BUTTON C SILVER 64 4 998 492 01 DOOR BLACK 64 4 998 492 11 DOOR SILVER 66 4 998 491 01 KNOB R41 BLACK 66 4 998 491 11 KNOB R41 SILVER 68 4 998 487 01 BUTTON B BLACK 68 4 998 487 11 BUTTON B SILVER 69 4 998 484 0...

Page 18: ... IC NJL56H400A TRANSISTOR Q701 8 729 119 78 TRANSISTOR 2SC403SP 51 RESISTOR R701 1 249 437 11 CARBON 47K 5 1 4W R702 1 249 429 11 CARBON 10K 5 1 4W R703 1 249 429 11 CARBON 10K 5 1 4W R704 1 249 419 11 CARBON 1 5K 5 1 4W F R705 1 249 419 11 CARBON 1 5K 5 1 4W F R707 1 249 441 11 CARBON 100K 5 1 4W R708 1 249 441 11 CARBON 100K 5 1 4W R709 1 247 807 31 CARBON 100 5 1 4W R710 1 249 406 11 CARBON 120...

Page 19: ...1 423 525 11 TRANSFORMER POWER A 4407 370 A TUNER BOARD COMPLETE 7 685 872 09 SCREW BVTT 3 8 S CAPACITOR C102 1 162 306 11 CERAMIC 0 01uF 20 16V C103 1 126 967 11 ELECT 47uF 20 16V C104 1 126 967 11 ELECT 47uF 20 16V C200 1 162 306 11 CERAMIC 0 01uF 20 16V C201 1 162 306 11 CERAMIC 0 01uF 20 16V C202 1 162 306 11 CERAMIC 0 01uF 20 16V C203 1 162 306 11 CERAMIC 0 01uF 20 16V C204 1 162 306 11 CERAM...

Page 20: ...C428 1 162 211 31 CERAMIC 33PF 5 50V C429 1 162 306 11 CERAMIC 0 01uF 20 16V C430 1 162 294 31 CERAMIC 0 001uF 10 50V C801 1 126 961 11 ELECT 2 2uF 20 50V C803 1 162 306 11 CERAMIC 0 01uF 20 16V C804 1 162 291 31 CERAMIC 560PF 10 50V C805 1 126 967 11 ELECT 47uF 20 16V C806 1 162 306 11 CERAMIC 0 01uF 20 16V C807 1 102 852 91 CERAMIC 47PF 5 50V C808 1 102 527 11 CERAMIC 82PF 5 50V C809 1 162 306 1...

Page 21: ... 4W R206 1 249 413 11 CARBON 470 5 1 4W F R207 1 249 411 11 CARBON 330 5 1 4W R208 1 247 863 91 CARBON 22K 5 1 4W R209 1 249 411 11 CARBON 330 5 1 4W R210 1 249 431 11 CARBON 15K 5 1 4W R211 1 249 411 11 CARBON 330 5 1 4W R212 1 249 411 11 CARBON 330 5 1 4W R213 1 247 863 91 CARBON 22K 5 1 4W R214 1 249 441 11 CARBON 100K 5 1 4W R221 1 249 413 11 CARBON 470 5 1 4W F R222 1 249 405 11 CARBON 100 5 ...

Page 22: ... 421 11 CARBON 2 2K 5 1 4W F R425 1 249 420 11 CARBON 1 8K 5 1 4W F R426 1 249 421 11 CARBON 2 2K 5 1 4W F R429 1 249 393 11 CARBON 10 5 1 4W F R430 1 249 441 11 CARBON 100K 5 1 4W R431 1 249 429 11 CARBON 10K 5 1 4W R521 1 247 843 11 CARBON 3 3K 5 1 4W R522 1 247 863 91 CARBON 22K 5 1 4W R801 1 249 401 11 CARBON 47 5 1 4W F R802 1 249 421 11 CARBON 2 2K 5 1 4W F R803 1 249 429 11 CARBON 10K 5 1 4...

Page 23: ...ST SB920 28 Sony Corporation Home A V Products Company 98F167549 1 Printed in Hungary 1998 6 Published by Quality Assurance Dept Shibaura 9 922 881 11 ...

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