Sony STR-DE235 Service Manual
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Sony STR-DE235 Service Manual

Fm stereo/fm-am receiver
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STR-DE235

SERVICE MANUAL

AEP Model
UK Model
SPECIFICATIONS
– Continued on next page –
FM STEREO/FM-AM RECEIVER
MICROFILM

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Summary of Contents for Sony STR-DE235

  • Page 1: Service Manual

    STR-DE235 SERVICE MANUAL AEP Model UK Model SPECIFICATIONS – Continued on next page – FM STEREO/FM-AM RECEIVER MICROFILM...

  • Page 2: Table Of Contents

    LINE WITH 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 PUB- LISHED BY SONY.

  • Page 3: General

    SECTION 1 GENERAL Location of controls • Front view !¡ !™ !¢ !∞ !§ #∞ #§ !¶ #¶ !• !ª @º @¡ @™ @£ @¢ @∞ @§@¶@• @ª#º #¡ #™ #£ #¢ 1 I/u button !¢ CINEMA indicator @¶ CENTER button and indicator 2 TUNING +, –...

  • Page 4: Disassembly

    SECTION 2 DISASSEMBLY Note: Follow the disassembly procedure in the numerical order given. CASE 1 screw (case3 TP2) 1 two screws (case3 TP2) 2 case 1 two screws (case3 TP2) FRONT PANEL SECTION 3 screw (BVTP3 × 8) 2 three connectors (CNP702 –...

  • Page 5: Test Mode

    SECTION 3 TEST MODE REAR PAENL SECTION Initialization Mode All preset contents are cleared when this mode is activated. When returning the unit to the customer after completing repairs, per- form this operation to clear the unit. 4 rear panel section Procedure: 3 two screws [TUNER]...

  • Page 6: Diagrams

    STR-DE235 SECTION 4 DIAGRAMS 4-1. BLOCK DIAGRAM – MAIN Section (1/2) – DOLBY SURROUND PASSIVE DECODER IC301 RV404 MASTER VOLUME REAR LINE AMP LS-OUT IC302 (1/2) –4 (Page 9) MUTING Q363 LC-INB RV421 RV422 RV423 DOLBY SURROUND LC-INE PRO-LOGIC DECODER...
  • Page 7 STR-DE235 4-2. BLOCK DIAGRAM – MAIN Section (2/2) – J741 PHONES S701–2 S701–3 POWER AMP S701–2–1 IC701 (1/2) SPEAKERS A SPEAKERS A Ø ON ø OFF Ø ON ø OFF TM701 +VOUT1 FINAL –1 DRIVER DRIVER –VOUT1 DRIVE (Page 8)

  • Page 8: Block Diagram - Display/Power Supply Section

    STR-DE235 4-3. BLOCK DIAGRAM – DISPLAY/POWER SUPPLY Section – SYSTEM CONTROLLER, FL DRIVER IC201 (2/2) S200 SYS-POWER (POWER) S201 – 220, 222 – 227, S229 – 231, 234 – 244 FLUORESCENT INDICATOR TUBE RELAY B+ FL201 REMOTE CONTROL REGULATOR DISPLAY SECTION B+...
  • Page 9 4-4. NOTES FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS • Circuit Boards Location Note on Printed Wiring Board: Note on Schematic Diagram: • X : parts extracted from the component side. • All capacitors are in µF unless otherwise noted. pF: µµF •...
  • Page 10 STR-DE235 4-5. PRINTED WIRING BOARD – MAIN Board– • See page 14 for Circuit Boards Location. (Page 17) (Page (Page 17) (Page 18) • Semiconductor Location Ref. No. Location Ref. No. Location D300 IC805 D311 IC950 A-10 D312 D421 Q361...
  • Page 11 STR-DE235 4-6. PRINTED WIRING BOARDS – SP SW Board/SECONDARY Board/STANDBY Board/PRIMARY Board – • See page 14 for Circuit Boards Location. (Page 16) (Page 16) (Page 16) (Page 16) (Page 17) (Page 18) (Page 16) – 17 – – 18 –...

  • Page 12: Schematic Diagram - Main Board (1/4)

    STR-DE235 4-7. SCHEMATIC DIAGRAM – MAIN Board (1/4) – • See page 34 for IC Block Diagram. • Waveforms – MAIN Board – – DISPLAY Board – 1 IC1 !£ (OSCI) 1 IC201 #∞ (X2) 2.7 Vp-p 5.4 Vp-p 4.332 MHz 4.19 MHz...

  • Page 13: Schematic Diagram - Main Board (2/4)/Sp Sw Board

    STR-DE235 4-8. SCHEMATIC DIAGRAM – MAIN Board (2/4)/SP SW Board – (Page 20) (Page 25) – 21 – – 22 –...
  • Page 14 STR-DE235 4-9. SCHEMATIC DIAGRAM – MAIN Board (3/4) – • • See page 20 for Waveforms. See page 33 for IC Block Diagrams. (Page 19) (Page 32) (Page 25) (Page 29) – 23 – – 24 –...
  • Page 15 STR-DE235 4-10. SCHEMATIC DIAGRAM – MAIN Board (4/4)/SECONDARY Board/STANDBY Board/PRIMARY Board – • See page 35 for IC Block Diagram. (Page 21) (Page 24) – 25 – – 26 –...
  • Page 16 STR-DE235 4-11. PRINTED WIRING BOARDS – PANEL Section – • See page 14 for Circuit Boards Location. • Semiconductor (Page 16) Location (DISPLAY Board) Ref. No. Location D201 D202 D203 D204 (Page 27) D223 D225 D231 D232 IC201 IC202 IC203...

  • Page 17: Schematic Diagram - Panel Section

    STR-DE235 4-12. SCHEMATIC DIAGRAM – PANEL Section – • See page 20 for Waveform. • See page 35 for IC Block Diagram. (Page 23) (Page 32) – 29 – – 30 –...

  • Page 18: Printed Wiring Boards - Volume Board/Tone Board

    STR-DE235 4-13. PRINTED WIRING BOARDS – VOLUME Board/TONE Board – 4-14. SCHEMATIC DIAGRAM – VOLUME Board/TONE Board – • See page 14 for Circuit Boards Location. (Page 15) (Page 15) (Page 29) (Page 19) (Page 27) (Page 23) – 31 –...
  • Page 19 • IC Block Diagrams – MAIN BOARD – IC1 BU1924 TEST LOGIC AND OUTPUT SELECTOR SWITCH 57kHz OSCILLATOR ANTI- QUALITY BIT RECONSTRUCTION BANDPASS ALIASING GENERATOR FILTER (8th ORDER) DIVIDER FILTER BIPHASE CONTAS LOOP DEFFERENTIAL CLOCKED SYMBOL VARIABLE AND DECODER COMPARATOR DECODER FIXED DIVIDER CLOCK REGENERATION...
  • Page 20 IC301 LV1018 37 36 35 34 33 32 31 30 29 28 27 26 TRIM TRIM FILTER B-NR CONTROL 8K-SRAM FILTER FILTER VOLUME – DATA DECODER R-STEREO IC401 LC78212 IC701, 702 µPC2581V BIAS CIRCUIT PROTECTOR DRIVE DRIVE DRIVE DRIVE IN IN LEVEL SHIFT LATCH RESET...
  • Page 21 IC950 NJM2103D RESET – + VREF + – OUTC VSB/SESIN – – – DISPLAY Board – IC202 BA6208 MOTOR SWITCH DRIVE MOTOR SWITCH DRIVE – 35 –...

  • Page 22: Ic Pin Function Description

    4-15. IC PIN FUNCTION DESCRIPTION • DISPLAY BOARD IC201 µPD78045FGF-082-3B9 (SYSTEM CONTROLLER, FL DRIVER) Pin No. Pin Name Description 1 to 7 DIG7 to DIG1 Digit drive signal output to the fluorescent indicator tube (FL201) — Power supply terminal (+5V) Serial data transfer clock signal output to the dolby surround pro-logic circuit (IC300, 301), S.CLK LC78212 (IC401) and PLL IC on FM/AM tuner pack “L”...
  • Page 23 Pin No. Pin Name Description Motor drive signal (volume up direction) output to the volume motor drive (IC202) VOL UP “H” active SYS-POWER Power on/off switch (S200 I/u) input terminal “L” is input when key pressing TUNER-MUTE Muting control signal output to the FM/AM tuner pack “H”: muting on RDS CLK IN RDS serial clock signal input from the RDS decoder (IC1) Power down detection signal input from the reset signal generator (IC950)

  • Page 24: Exploded Views

    SECTION 5 EXPLODED VIEWS NOTE: • Items marked “*” are not stocked since they • -XX and -X mean standardized parts, so they The components identified by mark ! or dotted line with mark may have some difference from the original are seldom required for routine service.
  • Page 25 1-765-314-11 WIRE (FLAT TYPE) (7 CORE) 4-216-779-01 BUTTON (KEY) 1-769-941-11 WIRE (FLAT TYPE) (11 CORE) 4-216-794-31 PLATE INDICATION 1-673-043-11 VOLUME BOARD 4-996-698-01 EMBLEM, SONY 1-673-044-11 TONE BOARD 4-951-801-01 BUTTON (S) A-4419-013-A KEY BOARD, COMPLETE 1-673-045-11 SP SW BOARD 4-998-717-01 KNOB (BAL) 4-951-620-01 SCREW (2.6X8), +BVTP...
  • Page 26 (3) CHASSIS SECTION T901 supplied supplied The components identified by mark ! or dotted line with mark ! are critical for safety. Replace only with part number specified. Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 4-217-872-11 BOTTOM COVER 4-216-800-01 BACK PANEL (E25) (AEP) 4-216-798-11 SUB (MOLD)

  • Page 27: Electrical Parts List

    SECTION 6 DISPLAY ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in the • Items marked “*” are not stocked since they The components identified by mark ! or dotted line with mark parts list may be different from the parts speci- are seldom required for routine service.

  • Page 28: Display Key

    DISPLAY Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark < VIBRATOR > R265 1-249-429-11 CARBON 1/4W R266 1-249-411-11 CARBON 1/4W X201 1-577-101-11 VIBRATOR, CERAMIC (4.19MHz) R267 1-249-413-11 CARBON 1/4W R268 1-249-415-11 CARBON 1/4W ************************************************************ R269 1-249-417-11 CARBON 1/4W A-4419-013-A KEY BOARD, COMPLETE R270...
  • Page 29 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark S243 1-762-196-21 SWITCH, TACT (SOUND FIELD ON/OFF) C347 1-126-963-11 ELECT 4.7uF S244 1-762-196-21 SWITCH, TACT (SOUND FIELD – MODE) C348 1-126-959-11 ELECT 0.47uF ************************************************************ C349 1-126-963-11 ELECT 4.7uF A-4419-015-A MAIN BOARD, COMPLETE C350...
  • Page 30 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C705 1-102-233-00 CERAMIC 33PF 500V CC53 1-162-282-31 CERAMIC 100PF CC54 1-162-282-31 CERAMIC 100PF C710 1-104-664-11 ELECT 47uF CC55 1-162-282-31 CERAMIC 100PF C711 1-137-372-11 FILM 0.022uF CC56 1-162-282-31 CERAMIC 100PF C720 1-162-286-31 CERAMIC...
  • Page 31 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark IC302 8-759-636-74 IC M5218AP-22 Q753 8-749-010-25 IC MN2488-OPY-M IC401 8-759-545-64 IC LC78212 Q754 8-749-010-26 IC MP1620-OPY-M IC701 8-759-326-52 IC uPC2581V Q770 8-729-140-82 TRANSISTOR 2SA988-PAFAEA IC702 8-759-326-52 IC uPC2581V Q801 8-729-140-97 TRANSISTOR 2SB734-34 IC801...
  • Page 32 MAIN Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R454 1-249-417-11 CARBON 1/4W R707 1-249-435-11 CARBON 1/4W R455 1-249-417-11 CARBON 1/4W R710 1-249-421-11 CARBON 2.2K 1/4W R456 1-249-417-11 CARBON 1/4W R711 1-249-440-11 CARBON 1/4W R457 1-249-417-11 CARBON 1/4W R713 1-249-414-11 CARBON...
  • Page 33 MAIN POWER SWITCH PRIMARY SECONDARY SP SW STANDBY TONE Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R953 1-249-433-11 CARBON 1/4W 1-673-045-11 SP SW BOARD R954 1-249-437-11 CARBON 1/4W ************ R955 1-249-429-11 CARBON 1/4W < CONNECTOR > R956 1-247-843-11 CARBON 3.3K...
  • Page 34 STR-DE235 TONE VOLUME Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C473 1-137-368-11 FILM 0.0047uF 5% R480 1-249-437-11 CARBON 1/4W C474 1-137-372-11 FILM 0.022uF < VARIABLE RESISTOR > < CONNECTOR > RV404 1-225-768-11 RES, VAR, CARBON 100K/100X3...

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