Sony ST-SB920 Service Manual
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Sony ST-SB920 Service Manual

Fm stereo fm-am tuner
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SERVICE MANUAL
FM tuner section
Frequency range
87.5 – 108.0 MHz
75 Ω, unbalanced
Aerial terminals
Intermediate frequency
10.7 MHz
Sensitivity
at 26 dB quieting
at 46 dB quieting
10.3 dBf, 0.9 µV/75 Ω
Usable sensitivity (IHF)
S/N
at 40 kHz deviation
Harmonic distortion
WIDE
NARROW
Frequency response
30 Hz – 15 kHz
(+0.3/–0.7 dB)
Separation
50 dB at 1 kHz
Selectivity
at 400 kHz
at 300 kHz
Output
at 40 kHz deviation 600 mV
MICROFILM
SPECIFICATIONS
(mono) 10.3 dBf, 0.9 µV/75 Ω
(stereo) 38.5 dBf, 23 µV/75 Ω
80 dB (mono), 76 dB (stereo)
0.035 % (mono), 0.045 (stereo)
0.055 % (mono), 0.075 (stereo)
WIDE 85 dB
NARROW 90 dB
WIDE 45 dB
NARROW 70 dB
ST-SB920
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 mV/m, 400 Hz)
Selectivity
50 dB
General
Power requirements
220 – 230 V, AC 50/60 Hz
Power consumption
12 W
75 Ω
Input impedance
Input connector
IEC-male
430 × 86 × 295 mm (w/h/d)
Dimensions
Weight
3.95
Supplied accessories
Audio cord (1)
AM loop aerial (1)
FM wire aerial (1)
EON connecting cord (1)
Design and specifications are subject to change without notice.
FM STEREO FM-AM TUNER
AEP Model
UK Model

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Summary of Contents for Sony ST-SB920

  • Page 1 ST-SB920 SERVICE MANUAL AEP Model UK Model SPECIFICATIONS FM tuner section AM tuner section Frequency range 87.5 – 108.0 MHz Frequency range MW: 522 – 1,611 kHz (9 kHz step) 75 Ω, unbalanced Aerial terminals LW: 144 – 288 kHz (1 kHz step) Intermediate frequency 10.7 MHz...

  • Page 2: Table Of Contents

    MARK ! ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS TEST MODE ·································································· 3 LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS ELECTRICAL ADJUSTMENT ································· 5 APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.

  • Page 3: Test Mode

    SECTION 2 TEST MODE 1. Circuit Check Mode Set to the reception frequency that the curcuit can STEREO RDS stations. (Set the input level to above 70 dB.) This enables circuit check to be performed in any of the reception modes-FM, AM (MW, LW). Set to a desired band before setting the test mode.
  • Page 4 3. Entering the Factory Preset (In case perform just to write memory of the Factory Preset.) NOTE : As contents of the Factory Preset will be written into memory after completing this check mode, delete contents of memory according to 4. Forced RESET. 1.

  • Page 5: Electrical Adjustment

    SECTION 3 ELECTRICAL ADJUSTMENTS Precautions in Repairing FM Discriminator ADJUSTMENT (NULL and MONO Distortion Adjustment) If the front end unit fails, it is difficult to repair the inner circuits, so replace the entire front end unit. Setting: IF BAND : WIDE Set “IF : WIDE”...
  • Page 6 Stereo Level Adjustment Stereo Separation Adjustment Setting: Setting: IF BAND : WIDE IF BAND : WIDE ANT ATT : OFF FM RF SSG level meter FM RF SSG FM ANTENNA (75 Ω ) LINE OUT FM ANTENNA (75 Ω ) Modulation : Stereo Standard signal Output level : 6mV (76dB) (at 75 Ω...
  • Page 7 AM SECTION AM Meter Level Adjustment Setting: BAND : LW loop antenna loop antenna (Supplied accessories) AM RF SSG AM antenna 30% amplitude 60 cm terminal (TM1) modulation by 400 Hz signal Field strength dB ( µ V/m) =SSG output level dB ( µ V/m) –26 dB. Carrier frequency : 216kHz Modulation : AUDIO 400Hz, 30% modulation Procedure:...

  • Page 8: Diagrams

    THIS NOTE IS COMMON FOR PRINTED WIRING For printed wiring boards. Note: BOARDS AND SCHEMATIC DIAGRAMS. • X : parts extracted from the component side. (In addition to this, the necessary note is printed in • b : Pattern from the side which enables seeing. each block.) For schematic diagrams.

  • Page 9: Schematic Diagram - Display Section

    ST-SB920 4-2. SCHEMATIC DIAGRAM – DISPLAY SECTION – • See page 8 for Waveforms. • See page 19 for IC Pin Function. — 9 — — 10 —...

  • Page 10: Printed Wiring Board - Display Section

    ST-SB920 4-3. PRINTED WIRING BOARD – DISPLAY SECTION – • See page 8 for Circuit Boards Location. TUNER BOARD CNP702 ENCODER BOARD DISPLAY BOARD 1-668-809- TUNING/SELECT FL701 FLUORESCENT INDICATOR TUBE TUNING (11) MODE DIRECT SHIFT AUTO-BETICAL NEWS (11) ENTER RETURN...
  • Page 11 ST-SB920 4-4. PRINTED WIRING BOARD – TUNER SECTION – • See page 8 for Circuit Boards Location. TUNER BOARD ANTENNA LINE OUT CNJ301 TM401 FM 750 • Semiconductor COAXIAL Location EON CONTROL Ref. No. Location D221 D251 FE101 FM FRONT END...

  • Page 12: Schematic Diagram - Tuner Section (1/2)

    ST-SB920 4-5. SCHEMATIC DIAGRAM – TUNER SECTION (1/2) – • See page 20 for IC Block Diagrams. — 15 — — 16 —...

  • Page 13: Schematic Diagram - Tuner Section (2/2)

    ST-SB920 4-6. SCHEMATIC DIAGRAM – TUNER SECTION (2/2) – • See page 8 for Waveforms. • See page 20 for IC Block Diagrams. BUFFER —17 — — 18 —...

  • Page 14: Ic Pin Function

    4-7. IC PIN FUNCTION (DISPLAY BOARD) • IC701 System Control (µPD780205GF-040-3BA) Pin No. Pin Name Function — Power supply (+5V). — Not used. (Open) — Not used. (Open) BAND1 — Not used. (Open) BAND2 — Not used. (Open) IF-B — Not used.

  • Page 15: Ic Block Diagram

    4-8. IC BLOCK DIAGRAMS (TUNER BOARD) IC301 LA3401 21 20 19 18 17 16 IC901 LA5667 LAMP DRIVE FM/AM SELECT CONTROL MUTING CONTROL LOGIC / MUTE ON/OFF FM/AM SELECT MUTING IC401 LA1245 IC221, IC251 LA1235 (IF) MUTING AM DET CIRCUIT METER DRIVE DETUNE...

  • Page 16: Exploded Views

    SECTION 5 EXPLODED VIEWS NOTE: • -XX, -X mean standardized parts, so they may • The mechanical parts with no reference number When indicating parts by reference number, have some differences from the original one. in the exploded views are not supplied. please include the board name.

  • Page 17: Panel And Display Section

    Description Remarks 4-998-493-01 PANEL, FRONT (BLACK) 4-998-485-11 HINGE (SILVER) 4-998-493-11 PANEL, FRONT (SILVER) 4-998-488-01 BUTTON (C) (BLACK) 4-942-568-41 EMBLEM (NO.5), SONY 4-998-488-11 BUTTON (C) (SILVER) 4-998-489-01 PLATE (C), INDICATION 4-998-492-01 DOOR (BLACK) 4-998-486-01 BUTTON (A) 4-998-492-11 DOOR (SILVER) 4-999-566-01 BUTTON (S)

  • Page 18: Electrical Parts List

    SECTION 6 DISPLAY ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in the • RESISTORS When indicating parts by reference number, parts list may be different from the parts All resistors are in ohms. please include the board name. specified in the diagrams or the components METAL: metal-film resistor The components identified by mark ! or...
  • Page 19 TRANS TUNER DISPLAY POWER SW Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks < VARIABLE RESISTOR > < EARTH > RV701 1-466-336-21 ENCODER, ROTARY (TUNING/SELECT) ECP900 1-690-880-51 LEAD (WITH CONNECTOR) < SWITCH > < TRANSFORMER > S701 1-554-303-21 SWITCH, TACTILE (SHIFT) ! PT901...
  • Page 20 TUNER Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks C303 1-136-161-00 FILM 0.047uF C901 1-101-004-00 CERAMIC 0.01uF C304 1-162-288-31 CERAMIC 330PF C902 1-101-004-00 CERAMIC 0.01uF C306 1-126-967-11 ELECT 47uF C903 1-126-967-11 ELECT 47uF C307 1-130-468-00 MYLAR 560PF C904 1-126-967-11 ELECT...
  • Page 21 TUNER Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks < IFT > R205 1-249-411-11 CARBON 1/4W R206 1-249-413-11 CARBON 1/4W F IFT252 1-404-845-11 COIL, DISCRI (PRIMARY) R207 1-249-411-11 CARBON 1/4W IFT253 1-404-846-11 COIL, DISCRI (SECONDARY) R208 1-247-863-91 CARBON 1/4W IFT401...
  • Page 22 TUNER Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks R309 1-249-426-11 CARBON 5.6K 1/4W R905 1-249-437-11 CARBON 1/4W R310 1-249-426-11 CARBON 5.6K 1/4W R906 1-249-437-11 CARBON 1/4W ! R311 1-249-405-11 CARBON 1/4W F ! R312 1-249-405-11 CARBON 1/4W F <...
  • Page 23 ST-SB920 Sony Corporation 98F167549-1 Printed in Hungary ©1998.6 Home A&V Products Company 9-922-881-11 Published by Quality Assurance Dept. — 28 — (Shibaura)

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