Sony-TCWE475-tape-sm 电路图 维修手册.pdf

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1、Model Name Using Similar MechanismTC-WE435 DECK ATCM-230ASR41A DECK BTCM-230ASR41B US Model Canadian Model AEP Model UK Model E Model Australian Model STEREO CASSETTE DECK SPECIFICATIONS Dolby noise reduction extension manufactured under license from Dolby Laboratories Licensing Corporation. HX Pro

2、originated by Bang and “HX PRO” are trademarks of Dolby Laboratories Licensing Corporation. TC-WE475 Continued on next page Transport Mechanism Type Ver. 1.7 2006.02 Sony Corporation Home Audio Division Pubulished by Sony Techno Create Corporation 9-873-893-18 2006B02-1 2006.02 SERVICE MANUAL System

3、 Fast-winding time Approx.100 sec. (with Sony C-60 cassette) Signal-to-noise ratio (at peak level and weighted with Dolby NR off) 55 dB, using Sony TYPE I cassette 57 dB, using Sony TYPE II cassette 58 dB, using Sony TYPE IV cassette S/N ratio improvement With Dolby B NR on: Approx. 5 dB at 1 kHz, 1

4、0 dB at 5 kHz With Dolby C NR on: Approx. 15 dB at 500 Hz, 20 dB at 1 kHz Harmonic distortion 0.4% (using Sony TYPE Icassette): 160 nWb/m 315 Hz, 3rd H.D.) 1.8% (using Sony TYPE IV cassette): 250 nWb/m 315 Hz, 3rd H.D.) Frequency response (DOLBY NR OFF) 30-16,000 Hz (3 dB, IEC), 20-17,000 Hz (6 dB),

5、 using Sony TYPE I cassette 30-17,000 Hz (3 dB, IEC), 20-18,000 Hz (6 dB), using Sony TYPE II cassette 30-19,000 Hz (3 dB, IEC), 20-20,000 Hz (6 dB), 30-13,000 Hz (3 dB, 4dB recording), using Sony TYPE IV cassette Wow and flutter 0.15% W. Peak (IEC) 0.1% W. RMS (NAB) 0.2% W. Peak (DIN) Variable pitc

6、h range Approx. 30 to +30 % Inputs Line inputs (phono jacks) sensitivity 0.16 V, input impedance 47 kilohms Outputs Line outputs (phono jacks) rated output level 0.5 V at a load impedance of 47 kilohms, load impedance over 10 kilohms Headphones (stereo phone jack) output level 0.25 mW at a load impe

7、dance of 32 ohms RadioFans.CN 收音机爱 好者资料库 2 TC-WE475 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. RE- PLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHO

8、WN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY. ATTENTION AU COMPOSANT AYANT RAPPORT LA SCURIT! LES COMPOSANTS IDENTIFIS PAR UNE MARQUE 0 SUR LES DIAGRAMMES SCHMATIQUES ET LA LISTE DES PICES SONT CRITIQUES POUR LA SCURIT DE FONCTIONNEMENT. NE REMPLACER CES COMPOSANTS QUE PAR DES PICES SONY DO

9、NT LES NUMROS SONT DONNS DANS CE MANUEL OU DANS LES SUPPLMENTS PUBLIS PAR SONY. SAFETY CHECK-OUT After correcting the original service problem, perform the follow- ing safety checks before releasing the set to the customer: Check the antenna terminals, metal trim, “metallized” knobs, screws, and all

10、 other exposed metal parts for AC leakage. Check leakage as described below. LEAKAGE 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 microampers). Leak- age current can be me

11、asured 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 volt

12、age 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 multimet

13、ers that have a 2V AC range are suitable. (See Fig. A) Fig. A. Using an AC voltmeter to check AC leakage. 0.15F To Exposed Metal Parts on Set 1.5k AC voltmeter (0.75V) Earth Ground General Power requirements U.S.A.and Canadian models: 120 V AC, 60Hz European models: 230 V AC, 50/60Hz Australian mode

14、ls: 240 V AC, 50/60Hz Other models: 120/220/230-240 V AC, 50/60Hz Adjustable with voltage selector Power consumption 18 watts Dimensions (w/h/d) Approx. 430 120 300 mm Mass4.2 kg Supplied accessories Audio connecting cords (2) Control A1II cable (1)* *Supplied for Canadian models only Design and spe

15、cifications are subject to change without notice. RadioFans.CN 收音机爱 好者资料库 3 TC-WE475 PARTS No.MODEL 4-232-514-0sUS model 4-232-514-1sCND model 4-232-514-2sAEP model 4-232-514-3sUK model 4-232-514-4sSP model 4-232-514-5sAUS model MODEL IDENTIFICATION Back panel Part No. Abbreviation CND : Canadian mo

16、del SP: Singapore model AUS : Australian model TABLE OF CONTENTS 1. GENERAL. 4 2. DISASSEMBLY 2-1. Case . 5 2-2. Front Panel Assy . 5 2-3. Cassette Lid Assy (Deck A/B) . 6 2-4. Mechanism Deck Assy (Deck A/B) . 6 3. SERVICE MODE. 7 4. MECHANICAL ADJUSTMENTS. 8 5. ELECTRICAL ADJUSTMENTS. 8 6. DIAGRAMS

17、 6-1. Circuit Boards Location .12 6-2. Printed Wiring Board MAIN Section . 14 6-3. Schematic Diagram MAIN (1/4) Section .15 6-4. Schematic Diagram MAIN (2/4) Section .16 6-5. Schematic Diagram MAIN (3/4) Section .17 6-6. Schematic Diagram MAIN (4/4) Section .18 6-7. Printed Wiring Board DECK A Secti

18、on . 19 6-8. Schematic Diagram DECK A Section .19 6-9. Printed Wiring Board DECK B Section . 19 6-10. Schematic Diagram DECK B Section . 19 6-11. Schematic Diagram DISPLAY Section .20 6-12. Printed Wiring Board DISPLAY Section . 21 6-13. Schematic Diagram PANEL Section .22 6-14. Printed Wiring Board

19、 PANEL Section . 23 6-15. Schematic Diagram POWER Section . 24 6-16. Printed Wiring Board POWER Section .25 6-17. IC PIN FUNCTION .26 7. EXPLODED VIEWS 7-1. Case Section. 27 7-2. Chassis Section .28 7-3. Cassette Holder Section .29 7-4. Front Panel Section . 30 7-5. Tape Mechanism Section . 31 8. EL

20、ECTRICAL PARTS LIST. 32 RadioFans.CN 收音机爱 好者资料库 4 TC-WE475 SECTION 1 GENERAL Front Panel Location of Parts and Controls 1POWER button 2RESET (Deck A) button 3MEMORY (Deck A) button 4RESET (Deck B) button 5MEMORY (Deck B) button 6AUTO REC LEVEL indicator 7REC LEVEL knob 8FADER button 9ARL button q;SY

21、NCHRO button qaPHONES jack qsHIGH/NOMAL button qd(AMS) M (Deck B) button qfH (Deck B) button qgREC z button qhA (Eject) (Deck B) button qjREC MUTING W button qkh (Deck B) button qlPAUSE X button w;x (Deck B) button wam (AMS) (Deck B) button ws(AMS) M (Deck A) button wdDOLBY NR OFF B/C switch wfH (De

22、ck A) button wgh (Deck A) button whm (AMS) (Deck A) button wjA (Eject) (Deck A) button wkx (Deck A) button wlPITCH CONTROL knob e;PITCH CONTROL button eaDIRECTION MODE switch AMS is the abbreviation for Automatic Music Sensor. 12 34 56 7 e; ea wj wl qlqjwgwd wfw; qk qhwh 9 0 qa 8 wsqs qd qfwk qgwa 5

23、 TC-WE475 SECTION 2 DISASSEMBLY Note : Follow the disassembly procedure in the numerical order given. 2-1. CASE 2-2. FRONT PANEL ASSY 1 screw (BVTT 3x6) 2 two screws (case 3 TP2) 3 two screws (case 3 TP2) 4 case qs screw (BVTP 3x8) qf screw (BVTP 3x8) qd screw (BVTP 3x8) qg two screws (BVTT 3x6) qj

24、claw qh claw qk front panel assy 8 CN301 7 CN401 2 CN807 1 CN5802 3 CN803 4 CNA806 5 flat type wire (Deck A) 9 CN002 6 flat type wire (Deck B) 0 screw (BVTP 3x8) qawire SetCaseFront Panel AssyCassette Lid Assy (Deck A/B)Mechanism Deck Assy (Deck A/B) The equipment can be removed using the following

25、procedure. 6 TC-WE475 2-3. CASSETTE LID ASSY (DECK A/B) 2-4. MECHANISM DECK ASSY (DECK A/B) 2 four claws 1 Push the EJECT button. 3 cassette lid assy 1 two screws (BVTP 2.6x8) 3 mechanism deck assy 2 two screws (BVTP 2.6x8) 7 TC-WE475 RESET0 MEMORY1 m (AMS)2 (AMS) M3 xGrid check display (*1) h4 H5 D

26、IRECTION MODE switch gh sPLAY RELAYH A deck side ButtonDisplay KEY CHECK & DISPLAY CHECK MODE While pressing the h (A deck) and REC MUTING W buttons with the power off, press the POWER button to turn on the power. The fluorescent indicator tube displays the number or special message corresponding to

27、 the button pressed. The message displayed differs according to the position of the switch. SECTION 3 SERVICE MODE RESET0 MEMORY1 HIGH/NOMAL2 m (AMS)3 (AMS) M4 xSegment check display (*2) h5 H6 PAUSE X7 REC MUTING W8 REC z9 FADERA ARLb SYNCHROAll lit DOLBY NR switch OFFh BPLAY CH B deck side ButtonD

28、isplay Grit check display (*1) Segment check display (*2) RMS 8 TC-WE475 PRECAUTION 1. Clean the following parts with a denatured alcohol-moistened swab : record/playback/erase headpinch roller rubber beltscapstan idlers 2. Demagnetize the record/playback head with a head demagne- tizer. 3. Do not u

29、se a magnetized screwdriver for the adjustment. 4. After the adjustments, apply suitable locking compound to the parts adjusted. 5. The adjustments should be performed with the rated power sup- ply voltage unless otherwise noted. Torque Measurement SECTION 5 ELECTRICAL ADJUSTMENTS SECTION 4 MECHANIC

30、AL ADJUSTMENTS PRECAUTION 1. The adjustment should be performed in the publication. (Be sure to male playback adjustment at first.) 2. The adjustments and measurement should be performed for both L-CH and R-CH. Switch position DOLBY NR switch: OFF DIRECTION MODE switch : g Standard record position :

31、 Deliver the standard input signal level to input jack and set the REC LEVEL knob to obtain the standard output signal level as follows. Record Mode 0 dBs = 0.775 V Standard Input Level Test Mode 1. While pressing the H (DECK A) and REC MUTING W buttons with the power off, press the ! button to turn

32、 on the power. The fluorescent display tube lights up for about one sec- ond, and the test mode is set. The test mode performs the fol- lowing two special functions. Playback speed switching function Pressing the HIGH/NORMAL button switches the playback speed between standard/double speed. Counter R

33、ESET & MEMORY function Resets the counter when recording starts. When rewound with the m (AMS) button after recording, stops at the point where recording started. 2. To release the test mode, turn OFF the power switch. ModeTorque meterMeter reading ForwardCQ-102C 30 to 65 g cm (0.42 to 0.90 oz inch)

34、 Forward back tension CQ-102C DECK A : 1 to 6 g cm (0.014 to 0.083 oz inch) DECK B : 2 to 9 g cm (0.028 to 0.125 oz inch) ReverseCQ-102RC 30 to 65 g cm (0.42 to 0.90 oz inch) Reverse back tension CQ-102RC 1 to 6 g cm (0.014 to 0.083 oz inch) FF/REWCQ-201B 70 to 120 g cm (0.97 to 1.67 oz inch) set +

35、AF OSC attenuator 10 k 600 LINE IN level meter LINE OUT 47 k Standard Output Level Test Tape Input terminalLINE IN source impedance10 k input signal level0.5 V (3.8 dBs) TapeContentsUse P-4-A10010 kHz, 10 dBAzimuth Adjustment WS-48B3 kHz, 0 dBTape Speed Adjustment P-4-L300315 Hz, 0 dBPB Level Adjust

36、ment Input terminalLINE IN source impedance10 k input signal level0.5 V (3.8 dBs) 9 TC-WE475 Record/Playback Head Azimuth Adjustment DECK A DECK B Procedure: 1. Forward Playback Mode 2. Turn the adjustment screw for the maximum output levels. If these levels do not match, turn the adjustment screw u

37、ntil both of output levels match together within 1 dB. 3. Playback Mode 4. Change the reverse playback mode and repeat the steps 1 to 3. 5. After the adjustment, lock the adjustment screws with suitable locking compound. Adjustment Location: record/playback head Tape speed Adjustment DECK A DECK B A

38、djust DECK A first Procedure: Forward Playback Mode (High speed adjustment) 1. Press the PITCH CONTROL button to set to OFF . 2. Set to test mode. (Refer to page 11.) 3. Press the H button to playback. 4. Press the HIGH/NORMAL button to playback at double speed. 5. Adjust RV316 (DECK A), RV416 (DECK

39、 B) so that the fre- quency counter reading becomes 5,980 180 Hz. (Normal speed adjustment) 6. Press the H button to playback. 7. Press the HIGH/NORMAL button to playback at normal speed. 8. Adjust RV317 (DECK A), RV417 (DECK B) so that the fre- quency counter reading becomes 3,000 90 Hz. (Pitch con

40、trol adjustment) (DECK A) 9. Press the PITCH CONTROL button to set to ON . 10. Set PITCH CONTROL knob to mechanical center. 11. Press the H button to playback. 12. Adjust RV318 so that the frequency counter reading becomes 2,990 90 Hz. Adjustment Location: MAIN board (See page 14.) Sample value of w

41、ow and flutter W.RMS (JIS) less than 0.3% . (test tape : WS-48B) Playback Level Adjustment DECK A DECK B Procedure: Forward Playback Mode Adjust DECK A : RV111 (L-CH), RV211 (R-CH) and DECK B : RV121 (L-CH), RV221 (R-CH) so the level meter read- ing becomes the adjustment limits below. Adjustment Va

42、lue: LINE OUT level : 7.7 dBs 0.5 dB (0.301 to 0.338 V) Level difference between channels : within 0.5 dB Confirm that the LINE OUT level does not change in playback mode while changing the mode from playback to stop several times. Adjustment Location: MAIN board (See page 14.) set test tape P-4-A10

43、0 (10 kHz, 10 dB) level meter LINE OUT 47 k within 1 dB within 1 dB output level R-CH peak R-CH peak L-CH peak L-CH peak screw position screw position VH Screen Pattern set In phase4590135180 goodwrong 47 k 47 k L-CH R-CH test tape P-4-A100 (10 kHz, 10 dB) LINE OUT oscilloscope forward sidereverse s

44、ide adjustment screws set frequency counter 47 k LINE OUT test tape WS-48B (3 kHz, 0 dB) set test tape P-4-L300 (315 Hz, 0 dB) level meter LINE OUT 47 k 10 TC-WE475 Bias Consumption Current Adjustment DECK B This adjustment should be performed when replacing the head assy or the bias oscillator tran

45、sformer (T141, T241). Setting: REC LEVEL knob : standard recording position (See page 11.) Procedure: 1. Connect the digital voltmeter to test point TP441. 2. Set RV141 (L-CH), RV241 (R-CH) to mechanical center. 3. Press the H button to playback. 4. Adjust T141 (L-CH), T241 (R-CH) so that the digital voltmeter reading becomes minimum. Adjustment Value: Maximum 220 mV Adjustment Location: MAIN board (See page 14.) Record Bias Adjustment DECK B Setting: REC LEVEL knob : st