Sony str de 945 service manual
This is the 78 pages manual for sony str de 945 service manual.
Read or download the pdf for free. If you want to contribute, please upload pdfs to audioservicemanuals.wetransfer.com.
Extracted text from sony str de 945 service manual (Ocr-read)
Page 1
2 SAFETY-RELATED COMPONENT WARNING!! COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS AP- PEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB- LISHED BY SONY.ATTENTION AU COMPOSANT AYANT RAPPORT À LA SÉCURITÉ! LES COMPOSANTS IDENTIFÉS PAR UNE MARQUE 0 SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU DANS LES SUPPÉMENTS PUBLIÉS PAR SONY. Notes on chip component replacement - Never reuse a disconnected chip component. - Notice that the minus side of a tantalum capacitor may be dam- aged by heat. Flexible Circuit Board Repairing - Keep the temperature of the soldering iron around 270 ˚C during repairing. - Do not touch the soldering iron on the same conductor of the circuit board (within 3 times). - Be careful not to apply force on the conductor when soldering or unsoldering. FM tuner section Tuning range87.5 - 108.0 MHz Antenna terminals 75 ohms, unbalanced SensitivityMono: 18.3 dBf, 2.2 µV/75 ohms Stereo: 38.3 dBf, 22.5 µV/75 ohms Usable sensitivity 11.2 dBf, 1 µV/75 ohms S/NMono: 76 dB Stereo: 70 dB Harmonic distortion at 1 kHz Mono: 0.3% Stereo: 0.5% Separation45 dB at 1 kHz Frequency response 30 Hz – 15 kHz +0.5/–2 dB Selectivity60 dB at 400 kHz AM tuner section Tuning range Models of area code U, CA With 10-kHz tuning scale: 530 – 1710 kHz 6) With 9-kHz tuning scale: 531 – 1710 kHz 6) Models of area code AU, CN, SP With 9-kHz tuning scale: 531 – 1602 kHzModels of area code E With 10-kHz tuning scale: 530 – 1610 kHz 6) With 9-kHz tuning scale: 531 – 1602 kHz 6) AntennaLoop antenna Usable sensitivity 50 dB/m (at 1,000 kHz or 999 kHz) S/N54 dB (at 50 mV/m) Harmonic distortion 0.5 % (50 mV/m, 400 kHz) SelectivityAt 9 kHz: 35 dB At 10 kHz: 40 dB 6) You can change the AM tuning scale to 9 kHz y 10 kHz. After tuning in any AM station, turn off the receiver. Hold down the TUNING + button and press the ?/1 button. All preset stations will be erased when you change the tuning scale. To reset the scale to 10 kHz (or 9 kHz), repeat the procedure. Video section InputsVideo: 1 Vp-p 75 ohms S-video: Y: 1 Vp-p 75 ohms C: 0.286 Vp-p 75 ohms OutputsVideo: 1 Vp-p 75 ohms S-video: Y: 1 Vp-p 75 ohms C: 0.286 Vp-p 75 ohmsAC outlets Models of area code U, CA 2 switched, total 120 W/1A Models of area code AU, SP 1 switched, total 100 W Models of area code E, CN 2 switched, total 100 W Dimensions430 × 158 × 378 mm (17 × 6 1/4 × 15 in.) including projecting parts and controls Mass (Approx.) 10.3 kg (22 lb 12 oz) Supplied accessories -FM wire antenna (1) -AM loop antenna (1) -LR6 (size-AA) alkaline batteries (3) Models of area code U, CA only -Audio/video/control S connecting cord (1) -Control S connecting cord (1) STR-DE945 only -Remote commander RM-LJ304 (remote) (1) STR-DE845 only -Remote commander RM-LP204 (remote) (1) Design and specifications are subject to change without notice. General SystemTuner section: PLL quartz-locked digital synthesizer system Preamplifier section: Low-noise NF type equalizer Power amplifier section: Pure-complementary SEPP Power requirements Models of area code U, CA 120 V AC, 60 Hz Models of area code CN, SP 220 – 230 V AC, 50/60 Hz Models of area code AU 240 V AC, 50 Hz Models of area code E 120/220/240 V AC, 50/60 Hz Power consumption Models of area code U STR-DE945: 290 W STR-DE845: 280 W Models of area code CA STR-DE945: 345 VA STR-DE845: 335 VA Models of area code CN, SP STR-DE845: 220 W Models of area code AU STR-DE845: 230 W Models of area code E STR-DE845: 320 W - Abbreviation AU : Australian model CA : Canadian model CN : Chinese modelMY : Malaysia model SP : Singapore model U : US model
Page 2
3 MODEL IDENTIFICATION– Rear View – Part No. Fig. A. Using an AC voltmeter to check AC leakage. 1.5 k Ω 0.15 µF AC voltmeter (0.75 V) To Exposed Metal Parts on Set Earth Ground SAFETY CHECK-OUT After correcting the original service problem, perform the follow- ing safety check before releasing the set to the customer: Check the antenna terminals, metal trim, metallized knobs, screws, and all other exposed metal parts for AC leakage. Check leakage as described below. LEAKAGE TEST The AC leakage from any exposed metal part to earth ground and from all exposed metal parts to any exposed metal part having a return to chassis, must not exceed 0.5 mA (500 microamperes.). Leakage current can be measured by any one of three methods. 1. A commercial leakage tester, such as the Simpson 229 or RCA WT-540A. Follow the manufacturers instructions to use these instruments. 2. A battery-operated AC milliammeter. The Data Precision 245 digital multimeter is suitable for this job. 3. Measuring the voltage drop across a resistor by means of a VOM or battery-operated AC voltmeter. The limit indication is 0.75 V, so analog meters must have an accurate low-voltage scale. The Simpson 250 and Sanwa SH-63Trd are examples of a pas- sive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2 V AC range are suitable. (See Fig. A) TABLE OF CONTENTS 1. GENERAL ................................................................... 4 2. DISASSEMBLY ......................................................... 6 3. TEST MODE .............................................................. 9 4. DIAGRAMS 4-1. Block Diagram – MAIN Section (1/2) –........................ 11 4-2. Block Diagram – MAIN Section (2/2) –........................ 12 4-3. Block Diagram – DISPLAY/POWER SUPPLY Section –...................... 13 4-4. Note for Printed Wiring Boards and Schematic Diagrams ...................................................... 14 4-5. Schematic Diagram – DIGITAL Board (1/3) –.............. 15 4-6. Schematic Diagram – DIGITAL Board (2/3) –.............. 16 4-7. Schematic Diagram – DIGITAL Board (3/3) –.............. 17 4-8. Printed Wiring Board –DIGITAL Board (Component Side) ............................. 18 4-9. Printed Wiring Board –DIGITAL Board (Conductor Side) ............................... 19 4-10. Printed Wiring Boards –VIDEO/JOINT (1) (H) Boards (DE845) –................... 20 4-11. Schematic Diagram –VIDEO/JOINT (1) (H) Boards (DE845) –................... 21 4-12. Printed Wiring Boards – OSD/OSD JOINT (H) Boards (DE945) –................... 22 4-13. Schematic Diagram – OSD/OSD JOINT (H) Boards (DE945) –................... 23 4-14. Printed Wiring Board – AU SW Board –....................... 24 4-15. Schematic Diagram – AU SW Board –.......................... 25 4-16. Printed Wiring Board – S-VIDEO Board –.................... 26 4-17. Schematic Diagram – S-VIDEO Board –....................... 27 4-18. Printed Wiring Board –DISPLAY Board –.................... 28 4-19. Schematic Diagram – DISPLAY Board –...................... 29 4-20. Printed Wiring Board – MAIN Board –......................... 30 4-21. Schematic Diagram – MAIN Board (1/3) –................... 31 4-22. Schematic Diagram – MAIN Board (2/3) –................... 32 4-23. Schematic Diagram – MAIN Board (3/3) –................... 33 4-24. Printed Wiring Boards – H.P/MUTING/POWER/ ROTARY/VIDEO 3(DE945)/VOL/ V. SWITCH (E) Boards –............................................... 34 4-25. Schematic Diagram – H.P/MUTING/POWER/ ROTARY/VIDEO 3(DE945)/VOL/ V. SWITCH (E) Boards –............................................... 35 4-26. Printed Wiring Boards – BIAS (C)/BIAS (L) /BIAS (R)/BIAS (LS)/BIAS (RS)/5.1 IN Boards –....... 36 4-27. Schematic Diagram – BIAS (C)/BIAS (L) /BIAS (R)/BIAS (LS)/BIAS (RS)/5.1 IN Boards –....... 37 4-28. Printed Wiring Boards –DC (1)/DC (2) Boards –.......... 38 4-29. Schematic Diagram –DC (1)/DC (2) Boards –.............. 39 4-30. Printed Wiring Boards –AC/SP Boards –....................... 40 4-31. Schematic Diagram – AC/SP Boards –.......................... 41 4-32. IC Pin Function Description ........................................... 46 5. EXPLODED VIEWS ................................................ 56 6. ELECTRICAL PARTS LIST ............................... 59 Model DE945: US model DE945: Canadian model DE845: US model DE845: Canadian model Malaysia and Singapore models Chinese model Australian model E and PX models Part No. 4-226-871-0s 4-226-871-1s 4-226-871-3s 4-226-871-4s 4-226-871-5s 4-226-871-6s 4-226-871-7s 4-226-871-8s