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Sony STR-DE425 Service Manual
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Sony STR-DE425 Service Manual

Fm stereo/fm-am receiver
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SERVICE MANUAL
Manufactured under license from Dolby Laboratories
Licensing Corporation.
"DOLBY", "PRO LOGIC" and the double-D symbol are
trademarks of Dolby Laboratories Licensing Corporation.
Amplifier section
Power output
(DIN 1 kHz, 4 ohms)
Stereo mode
90 W + 90 W
Surround
(DIN 1 kHz, 4 ohms)
mode
Front: 90W/ch
Centre: 90W
(only in PRO LOG IC MODE)
REAR: (DIN 1 kHZ, 8ohms) 45 W/ch
5.1/DVD
Front: 90 W/ch
INPUT * mode
(DIN 1 kHz, 4 ohms)
Centre: 90 W (DIN 1 kHz, 4 ohms)
Rear: 45 W/ch (DIN 1 kHz, 8 ohms)
Frequency
PHONO: RIAA
response
equalization curve ±0.5 dB
TV / LD, CD, TAPE / MD,
VIDEO, 5.1/DVD INPUT:
10Hz - 50kHz ±1dB
Input
Sensitivity Impedance S/N
PHONO
2.5mV
50
(MM)
kilohms
CD,
5.1/DVD
200 mV
INPUT*
50
TAPE/MD,
kilohms
TV/LD,
150 mV
VIDEO
MICROFILM
SPECIFICATIONS
Outputs
Muting
BASS BOOST
TONE
FM tuner section
Tuning range
Aerial terminals
Sensitivity
(Weighting
Usable sensitivity 11.2 dBf, 1V /75 ohms (IHF)
network,
S/N
input level)
Harmonic
74 dB
distortion at
72 dB**
1 kHz
(A, 2.5 mV)
Separation
Frequency
response
82 dB
Selectivity
82 dB**
(A, 150 mV)
**'78IHF
STR-DE425
TAPE/MD REC OUT:
Voltage: 150 mV,
Impedance: 10 kilohms
VIDEO AUDIO OUT:
Voltage: 150 mV,
Impedance: 10 kilohms
WOOFER/MIX AUDIO
OUT: Voltage: 2V
Impedance: 10 kilohms
PHONES: Accepts low and high
impedance headphones
Full mute
+10dB at 70 Hz
±8dB at 100 Hz and 10 kHz
87.5 – 108.0 MHz
75 ohms, unbalanced
Mono: 18.3 dBf, 2.2µV /75 ohms
Stereo: 38.3 dBf, 22.5µV /75 ohms
Mono: 76 dB
Stereo: 70dB
Mono: 0.3 %
Stereo: 0.5 %
45dB at 1 kHz
+0.5
30 Hz – 15kHz
dB
–2
60 dB at 400 kHz
FM STEREO/FM-AM RECEIVER
US Model
Canadian Model
AEP Model
UK Model
E Model
Australian Model
Chinese Model
AM tuner section
Tuning range
531 – 1602 kHz
Aerial
Loop aerial
Usable sensitivity 50 dB/m (at 999 kHz)
S/N
54 dB(at 50 mV/m)
Harmonic
0.5%(50 mV/m, 400Hz)
distortion
Selectivity
35 dB
Video section
Input
VIDEO 1, 2, TV:
1 Vp-p 75 ohms
Output
VIDEO 1, 2, MONITOR:
1 Vp-p 75 ohms
General
System
Tuner section; PLL
quartz-locked digital
synthesizer system
Preamplifier section:
Low-noise NF type
epualizer
Power amplifier section:
Pure-complimentary
SEPP
Power
230 V AC, 50/60 Hz
requirements
Power
230 W
consumption
AC outlets
Switched 100 W
(except for the U.K.
model)
— Continued on next page —

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  • Page 1 STR-DE425 SERVICE MANUAL US Model Canadian Model AEP Model UK Model E Model Australian Model Chinese Model Manufactured under license from Dolby Laboratories Licensing Corporation. “DOLBY”, “PRO LOGIC” and the double-D symbol are trademarks of Dolby Laboratories Licensing Corporation. SPECIFICATIONS...

  • Page 2: Table Of Contents

    CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU PUBLISHED BY SONY.
  • Page 3 SECTION 1 GENERAL LOCATION AND FUNCTION OF CONTROLS [FRONT PANEL] #¡ #º @ª @¶ @∞ @£ @¡ !ª !∞ !™ @• @§ @¢ @™ @º !• !¶ !§ !¢ !£ !¡ !º 1 POWER switch (I/u) !¶ TUNER button 2 CENTER LEVEL +, – buttons !•...

  • Page 4: Test Mode

    SECTION 2 TEST MODE INITIALIZATION MODE AM CHANNEL STEP 9 kHz/10 kHz * All preset contents are cleared when this mode is activated. Use SELECTION MODE this mode before returning the product to clients upon completion * Either the 9 kHz step or 10 kHz step can be selected for the AM of repair.

  • Page 5: Diagrams

    SECTION 3 DIAGRAMS 3-1. CIRCUIT BOARDS LOCATION SECONDARY board PRIMARY board SP-SCREW board DISPLAY STAND BY board board VIDEO board SP-SW board MAIN board 10 KEY board VOLUME board VR-TONE board — 5 —...
  • Page 6 THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS. (In addition to this necessary note is printed in each block.) For schematic diagrams. For printed wiring boards. Note: Note: • X : parts extracted from the component side. •...

  • Page 7: Block Diagram

    STR-DE425 3-2. BLOCK DIAGRAM TUNER BLOCK AUDIO SELECTOR SURROUND IC401 PROCESSOR IC300 BASS TREBLE RV421 RV422 FM ANT POWER AMP L OUT LT IN L OUT (75Ω) IC701 AM ANT R OUT R CH C OUT 13 VCC SELECTOR POWER...

  • Page 8: Schematic Diagram - Display Section

    STR-DE425 3-3. SCHEMATIC DIAGRAM — DISPLAY SECTION — — 9 — — 10 —...

  • Page 9: Printed Wiring Board - Display Section

    STR-DE425 3-4. PRINTED WIRING BOARDS — DISPLAY SECTION — MAIN BOARD DISPLAY BOARD CNS204 (Page 17) EXCEPT AEP,UK,G,EE MODEL AEP,UK,G,EE MODEL 34 35 (PROLOGIC) AEP,UK,G,EE, CENTER LEVEL AUS MODEL (C.STUDIO) E,SP,MY,CH,EE IC201 MODEL (5.1/DVD INPUT) REAR LEVEL (BASS BOOST) (HALL)

  • Page 10: Schematic Diagram - Power Section

    STR-DE425 3-5. SCHEMATIC DIAGRAM — POWER SECTION — — 13 — — 14 —...

  • Page 11: Printed Wiring Board - Power Section

    STR-DE425 3-6. PRINTED WIRING BOARDS — POWER SECTION — VIDEO BOARD • Semiconductor PRIMARY BOARD SECONDARY BOARD Location J501 J251 J252 J253 TV/LD MONITOR WOOFER Ref. No. Location VIDEO VIDEO OUT VIDEO IN VIDEO IN VIDEO OUT AUDIO OUT FRONT...

  • Page 12: Printed Wiring Board - Main Section

    STR-DE425 • Semiconductor Location 3-7. PRINTED WIRING BOARD — MAIN SECTION — Ref. No. Location D310 EXCEPT D311 AEP,UK,G,EE J402 J403 D312 MODEL J402 J403 US,CND,AUS D421 J401 TAPE MD TV/LD VIDEO AEP,UK,G,EE TM601 TM701 MODEL MODEL D560 SURROUND SPEAKER...

  • Page 13: Schematic Diagram - Main Section (2/3)

    STR-DE425 3-8. SCHEMATIC DIAGRAM — MAIN SECTION (1/3) — — 19 — — 20 —...

  • Page 14: Schematic Diagram - Main Section (3/3)

    STR-DE425 3-9. SCHEMATIC DIAGRAM — MAIN SECTION (2/3) — — 21 — — 22 —...
  • Page 15 STR-DE425 3-10. SCHEMATIC DIAGRAM — MAIN SECTION (3/3) — — 23 — — 24 —...

  • Page 16: Ic Pin Function Description

    3-11. IC PIN FUNCTION DESCPIRTION • IC201 µPD78044FGF-112-3B9 Pin No. Pin Name Description DIG7 DIG6 DIG5 DIG4 Fluorescent indicator tube drive. DIG3 DIG2 DIG1 — Power supply (+5V). S. CLK System clock. S. DATA System data. PLL. DATA PLL data input from TU001. S.
  • Page 17 Pin No. Pin Name Description VOLUME UP Volume up. VOLUME DOWN Volume down. — Not used. (Open) SYS. POWER System power ON/OFF. RDS. DATA. IN RDS data input. RDS. CLK. IN RDS clock input. STOP Stop signal input from NJM2103D (IC950). —...

  • Page 18: Ic Block Diagrams

    3-12. IC BLOCK DIAGRAMS • IC BLOCK DIAGRAMS BU1922 TEST LOGIC AND OUTPUT SELECTOR SWITCH 57kHz ANTI- OSCILLATOR QUALITY BIT RECONSTRUCTION BANDPASS ALIASING GENERATOR FILTER (8th ORDER) FILTER DIVIDER BIPHASE CONTAS LOOP DEFFERENTIAL CLOCKED SYMBOL VARIABLE AND DECODER COMPARATOR DECODER FIXED DIVIDER CLOCK REGENERATION AND SYNC...
  • Page 19 IC701 uPC2581V BIAS CIRCUIT PROTECTOR DRIVE DRIVE DRIVE DRIVE IC202 BA6208 MOTOR SWITCH DRIVE MOTOR SWITCH DRIVE IC950 NJM2103D RESET – + VREF + – OUTC VSB/SESIN – – — 28 —...

  • Page 20: Exploded Views

    X-4949-627-1 KNOB (VOL) ASSY A-4407-537-A DISPLAY BOARD, COMPLETE(AEP,UK,G) 4-977-593-11 RING(DIA.50),ORNAMENTAL(EXCEPT US,CND) A-4407-995-A DISPLAY BOARD, COMPLETE(EE) 4-977-358-11 CUSHION (US,CND) 4-951-620-01 SCREW (2.6X8), +BVTP 4-996-698-01 EMBLEM, SONY * 11 A-4407-451-A VR-TONE BOARD, COMPLETE (US,CND,AUS,E,SP,MY,CH) 4-998-189-01 BUTTON (P-T) X-4949-624-1 FRONT PANEL ASSY (US,CND)

  • Page 21: Chassis Section

    4-2. CHASSIS SECTION UK MODEL CH MODEL E, PX MODEL US, CND MODEL AUS MODEL EXCEPT US, CND, AUS, CH MODEL not supplied supplied CNJ902 Transistor T901 not supplied not supplied not supplied not supplied Ref. No. Part No. Description Remarks Ref.

  • Page 22: Electrical Parts List

    SECTION 5 DISPLAY ELECTRICAL PARTS LIST NOTE: • -XX, -X mean standardized parts, so they may • COILS When indicating parts by reference number, have some difference from the original one. uH: µH please include the board name. • Items marked “*” are not stocked since they •...
  • Page 23 DISPLAY MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks R286 1-249-437-11 CARBON 1/4W S205 1-762-751-11 SWITCH,TACTILE (PTY) (AEP,UK,G,EE) R287 1-249-425-11 CARBON 4.7K 1/4W F S206 1-762-751-11 SWITCH,TACTILE (EON) (AEP,UK,G,EE) RD01 1-249-439-11 CARBON 1/4W S207 1-762-751-11 SWITCH,TACTILE (CHARACTER)(AEP,UK,G,EE) (US,CND,AUS,E,SP,MY,CH) S208 1-762-751-11 SWITCH,TACTILE (DISPLAY) (AEP,UK,G,EE)
  • Page 24 MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks C317 1-164-159-11 CERAMIC 0.1uF C426 1-126-795-11 ELECT 10uF C318 1-136-357-11 FILM 680PF C427 1-162-207-31 CERAMIC 22PF C322 1-126-962-11 ELECT 3.3uF C428 1-124-252-00 ELECT 0.33uF C323 1-136-173-00 FILM 0.47uF C429 1-130-489-00 MYLAR...
  • Page 25 MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks C652 1-162-282-31 CERAMIC 100PF CC03 1-162-282-31 CERAMIC 100PF C654 1-104-665-11 ELECT 100uF (AEP,UK,G,EE) C660 1-137-372-11 FILM 0.022uF CC04 1-162-282-31 CERAMIC 100PF C702 1-162-282-31 CERAMIC 100PF (AEP,UK,G,EE) C703 1-126-933-11 ELECT 100uF CC05...
  • Page 26 MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks D817 8-719-933-61 DIODE HZS9C3LTD Q570 8-729-140-82 TRANSISTOR 2SA988-PAFAEA D818 8-719-911-19 DIODE 1SS119 Q610 8-729-119-78 TRANSISTOR 2SC403SP-51 D901 8-719-911-19 DIODE 1SS119 Q701 8-729-119-76 TRANSISTOR 2SA1175-HFE Q702 8-729-141-30 TRANSISTOR 2SC3623A-LK <...
  • Page 27 MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks R410 1-247-897-11 CARBON 560K 1/4W R478 1-249-417-11 CARBON 1/4W F (AEP,UK,G,EE) R480 1-249-437-11 CARBON 1/4W R411 1-249-416-11 CARBON 1/4W F R481 1-247-843-11 CARBON 3.3K 1/4W (AEP,UK,G,EE) R482 1-247-883-00 CARBON 150K 1/4W...
  • Page 28 MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks R604 1-249-411-11 CARBON 1/4W R761 1-249-440-11 CARBON 1/4W (US,CND,AUS,E,SP,MY,CH) R763 1-249-414-11 CARBON 1/4W F ! R610 1-249-393-11 CARBON 1/4W F ! R764 1-249-409-11 CARBON 1/4W F R611 1-249-389-11 CARBON 1/4W F (AEP,UK,G,EE)
  • Page 29 MAIN PRIMARY SECONDARY SP-SCREW SP-SW STAND BY Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks ! RF800 1-212-887-00 FUSIBLE 1/4W F < RESISTOR > (AEP,UK,G,EE,E,SP,MY,CH) RR01 1-249-418-11 CARBON 1.2K 1/4W F RR04 1-249-393-11 CARBON 1/4W F (AEP,UK,G,EE) RR05 1-249-393-11 CARBON...
  • Page 30 STAND BY VIDEO VR-TONE Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks < RELAY > R276 1-249-421-11 CARBON 2.2K 1/4W F R277 1-249-429-11 CARBON 1/4W ! RY901 1-755-018-11 RELAY R278 1-249-421-11 CARBON 2.2K 1/4W F R280 1-249-421-11 CARBON 2.2K 1/4W F...
  • Page 31 VR-TONE 10 KEY Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks R355 1-249-417-11 CARBON 1/4W F R247 1-249-413-11 CARBON 1/4W F R356 1-249-417-11 CARBON 1/4W F R248 1-249-415-11 CARBON 1/4W F R361 1-249-425-11 CARBON 4.7K 1/4W F R249 1-249-417-11 CARBON 1/4W F...
  • Page 32 Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks ! T901 1-431-270-11 TRANSFORMER, POWER (AUS) ! T901 1-431-791-11 TRANSFORMER, POWER (AEP,UK,G,EE) ! T901 1-431-792-11 TRANSFORMER, POWER (E,SP,MY,CH) ************************************************************ ACCESSORIES & PACKING MATERIALS ******************************* 1-475-710-11 REMOTE COMMANDER RM-U302 (EXCEPT CND) 1-501-374-11 ANTENNA, LOOP 1-501-594-11 ANTENNA (FM)(EXCEPT US,CND)
  • Page 33 STR-DE425 Sony Corporation 98C1690-1 Printed in Japan © 1998.3 Home A&V Products Company 9-922-811-11 Published by General Engineering Dept. — 42 — (Shibaura)

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