Sony-TCWE675-tape-sm 电路图 维修手册.pdf

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1、Model Name Using Similar MechanismTC-WE635 Transport Mechanism TypeTCM-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 or

2、iginated by Bang and “HX PRO” are trademarks of Dolby Laboratories Licensing Corporation. TC-WE675 Continued on next page Ver 1.4 2002.11 Sony Corporation Home Audio Company Pubulished by Sony Engineering Corporation 9-873-894-15 2002K0200-1 2002. 11 SERVICE MANUAL System Fast-winding time Approx.10

3、0 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, 10 dB at 5 kHz With Dolby C N

4、R 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), using Sony TYPE I cassette

5、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 0.13% W. Peak (IEC) 0.1% W. RMS (NAB) 0.2% W. Peak (DIN) Variable pitch range Approx. 30 to +30 %

6、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 impedance of 32 ohms RadioFans.C

7、N 收音机爱 好者资料库 2 TC-WE675 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 SHOWN IN THIS MANUAL OR IN SUPP

8、LEMENTS 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 DONT LES NUMROS SONT DONNS DAN

9、S 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 other exposed metal parts f

10、or 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 measured by any one of three m

11、ethods. 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 b

12、y 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 2V AC range

13、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 models: 240 V AC, 50/60Hz Other

14、models: 120/220/230-240 V AC, 50/60Hz Adjustable with voltage selector Power consumption 22 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 specifications are subject to c

15、hange without notice. RadioFans.CN 收音机爱 好者资料库 3 TC-WE675 PARTS No.MODEL 4-232-414-0sUS model 4-232-414-1sCND model 4-232-414-2sAEP model 4-232-414-3sUK model 4-232-414-4sSP model 4-232-414-5sAUS model MODEL IDENTIFICATION Back panel Part No. Abbreviation CND : Canadian model SP: Singapore model AUS

16、: 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 6-1. Circuit Boards Locatio

17、n .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 Section .19 6-8. Schematic Diagr

18、am DECK Section .19 6-9. Schematic Diagram LEAF SW Section . 20 6-10. Printed Wiring Board LEAF SW Section .21 6-11. Schematic Diagram PANEL Section .22 6-12. Printed Wiring Board PANEL Section . 23 6-13. Schematic Diagram POWER Section . 24 6-14. Printed Wiring Board POWER Section .25 6-15. IC PIN

19、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. ELECTRICAL PARTS LIST. 32 RadioFans.CN 收音机爱 好者资料库 4 TC-WE675 SECTION 1 GENERAL Front Panel Location of Parts and Controls 1

20、POWER 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 0SYNCHRO button qaPHONES jack qsHIGH/NOMAL button qdA+B REC button qfDECK B button qgDECK A button qh(AMS) M (Deck B) button

21、qjm (AMS) (Deck B) button qkH (Deck B) button qlh (Deck B) button w;REC z (Deck B) button waA (Eject) (Deck B) button wsREC MUTING W (Deck B) button wdPAUSE X (Deck B) button wfx (Deck B) button wgDOLBY NR B/C switch whDOLBY NR OFF/ON FILTER wjH/FRONT (Deck A) button wkh/BACK (Deck A) button wlREC z

22、 (Deck A) button e;REC MUTING W (Deck A) button eaA (Eject) (Deck A) button esPAUSE X (Deck A) button edx/CLEAR (Deck A) button ef(AMS) M (Deck A) button RMS + egm (AMS) (Deck A) button RMS ehDISPLAY button ejCHECK button ekSET button elRMS/START button r;PITCH CONTROL knob raPITCH CONTROL button rs

23、DIRECTION switch AMS is the abbreviation for Automatic Music Sensor. 12 34 56 7 ra rs r; wdwle; wsw;qlqk qjqfqgqdqsqhegefwfwjwk wa eaed 9 0 qa 8 wgeswh ekelejeh 5 TC-WE675 SECTION 2 DISASSEMBLY Note : Follow the disassembly procedure in the numerical order given. 2-1. CASE 2-2. FRONT PANEL ASSY 1 sc

24、rew (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 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 (Dec

25、k 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 procedure. 6 TC-WE675 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 casset

26、te lid assy 1 two screws (BVTP 2.6x8) 3 mechanism deck assy 2 two screws (BVTP 2.6x8) 7 TC-WE675 RESET0 MEMORY1 RMS/START2 SET3 CHECK4 DISPLAY5 m (AMS)6 (AMS) M7 x/CLEARGrid check display (*1) n/BACK8 N/FRONT9 PAUSE XA REC MUTING Wb REC zC DIRECTION MODE switch gh sPLAY RELAYH A deck side ButtonDisp

27、lay KEY CHECK & DISPLAY CHECK MODE While pressing the h/BACK (A deck) and REC MUTING W (B deck) buttons with the power off, press the POWER button to turn on the power. The fluorescent display tube displays the number or special message corresponding to the button pressed. The message displayed diff

28、ers according to the position of the switch. SECTION 3 SERVICE MODE RESET0 MEMORY1 DECK A2 DECK B3 A+B REC4 HIGH/NOMAL5 m (AMS)6 (AMS) M7 xSegment check display (*2) h8 H9 PAUSE XA REC MUTING Wb REC zC FADERd ARLE SYNCHROAll lit DOLBY NR switch (*3) OFFh BPLAY CH B deck side ButtonDisplay Grit check

29、 display (*1) Segment check display (*2) RMS (*3) The DOLBY NR switch consists of a pair of switches. B and C are valid only in the ON or ON FILTER state. 8 TC-WE675 PRECAUTION 1. Clean the following parts with a denatured alcohol-moistened swab : record/playback/erase headpinch roller rubber beltsc

30、apstan idlers 2. Demagnetize the record/playback head with a head demagne- tizer. 3. Do not use 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 u

31、nless otherwise noted. Torque Measurement SECTION 5 ELECTRICAL ADJUSTMENTS SECTION 4 MECHANICAL 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-

32、CH. Switch position DOLBY NR switch: OFF DIRECTION MODE switch : g Standard record position : 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 pr

33、essing the H/FRONT (DECK A) and REC MUT- ING W buttons with the power off, press the ! button to turn on the power. The fluorescent display tube lights up for about one second, and the test mode is set. The test mode performs the following two special functions. Playback speed switching function Pre

34、ssing the HIGH/NORMAL button switches the playback speed between standard/double speed. Counter RESET & 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 th

35、e power switch. ModeTorque meterMeter reading ForwardCQ-102C 30 to 65 g cm (0.42 to 0.90 oz inch) 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-102R

36、C 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 + 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) Input terminalLINE IN source impe

37、dance10 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 Adjustment 9 TC-WE675 Record/Playback Head Azimuth Adjustment DECK A DECK B Procedure: 1. Forward Playback Mode 2. Turn the adjustme

38、nt screw for the maximum output levels. If these levels do not match, turn the adjustment screw until 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

39、locking compound. Adjustment Location: record/playback head Tape speed Adjustment DECK A DECK B Adjust 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

40、. Press the HIGH/NORMAL button to playback at double speed. 5. Adjust RV316 (DECK A), RV416 (DECK B) so that the fre- quency counter reading becomes 5,980 80 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

41、(DECK A), RV417 (DECK B) so that the fre- quency counter reading becomes 3,000 90 Hz. (Pitch control 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 count

42、er reading becomes 2,990 90 Hz. Adjustment Location: MAIN board (See page 14.) Sample value of wow 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-C

43、H), RV221 (R-CH) so the level meter read- ing becomes the adjustment limits below. Adjustment Value: 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 play

44、back to stop several times. Adjustment Location: MAIN board (See page 14.) set test tape P-4-A100 (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

45、 k 47 k L-CH R-CH test tape P-4-A100 (10 kHz, 10 dB) LINE OUT oscilloscope forward sidereverse side 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-WE675 Bias Consumption Current Adjustment DECK A DECK B This adjustment should be performed when replacing the head assy or the bias oscillator transformer (T131, T231),(T141, T241). Setting: REC LEVEL knob : standard recording position (See page 11.) Procedu