KENWOOD - KW-6044 - Stereo Reel-to-Reel Tape Deck - Service Manual 电路图 维修手册.pdf

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1、 KENWOOD HI/Fl STEREO COMPONENTS ERVICE ANUAL -KW-6044 (j) (j) , 3 ;ti;.:, wo. . - . - - - . ,. :.- . 0 3 HEAD SURROUND SONIC STEREO TAPE DECK RadioFans.CN 收音机爱 好者资料库 TABLE OF CONTENTS SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2、. . . . . . . . 3 EXTERNAL VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 TOP CHASSIS VIEW. . . . . . . . . 5 BOTTOM CHASSIS VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3、. . . 5 BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 LEVEL DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 SCHEMATIC DIAGRAM . . . . . . .

4、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 OPERATION . 10 ADJUSTMENT OF MECHANISM . . 13 INITIAL ADJUSTMENT OF ELECTRIC CIRCUIT . 16 TABLE OF ADJUSTMENT jj VJ Speed changeover-.- ,i!WliM . ,. , , A shaft U Jt (i. - l-. 1 Control shaft VI f fiii Oi t

5、 . E, . 1 31 ;: Record head l (1) V, _,:,_ , ,_ I A Level volume (VR1, 2) VI 2545-03 1 Cr-,E? IR01-4002-051 ._t wnL_,_ ;t,- Recocd SW IS1.21 .J II!-= ,. I Posh swnch 1S141 w (S40-2017-05) f(i G) I (S39-1001-05) m I . , Level volume (VR5, 6) I = -. 1 b VU meter c:. (R01-3009-05) l . . I -, 1 . f CAI,

6、;. MIC jack J j . ,;, r -1 : . _ 1 _ , w:1 . , : Head phone jack Lever SW (S8, 9) _ _. VU meter I _ Lever SW (S10I (S36-2018-05) (S36-2018-05I Rottary SW (S7) _ _. _ Level volume (VR3, 4) (S04-3011-05) (R01-4002-05I ca Phase advancer capacitor j (24-02-62) . ;_-p,t 1 I .;:!(!, :4= I pail!lII (D10-00

7、69-03) VJ (S46-4001-05) w . ,r. . - - - Equalizer changeover VJ - _J Ii lever B C) :c ) s: . 0 LINE INPUT -10 I -20 -30 I REC/PLAY LEVEL -40 dB MIC -50 0.24V -I0dB -60 MIC LINE INPUT 1.4mV I - .55d8 STANDARD RECORD CONDITION ON CH - 2 (at 1 KHz) 9 B 1 ( ) . PLAYBACK AMP. ( 16.3mV -33.SdB 2SC458LG C

8、2SC458LG C 1 _ I 2Ir: 7 REC LEVEL a: -, VR1 / / REC/PLAY l.75mV -40d8 PLAYBACK AMP. (R -CH) ) 11,SmV -36.SdB ._ ) TO PLAYBACK HEAD B VR201 13,5V +25d8 osc r- m Q :rJ ) s ex: 0 -10 -20 -30 LEVEL dB -40 -50 -60 _ _ L. CH P. H - CD 0107 0109 STANDARD PLAYBACK CONDITION ON CH - 1 (at 1 KHz) 27. SrnV -29

9、dB Q) Q) 7. 75rnV -40dB 0115 - (j) (j) 0. 775V 0 dB LINE OUTPUT i-LEVEL METER ._ _ HEADPHONE 0.775V 0 dB 0.4V -5.BdB II r 33rnV -27 .SdB - I _ J CH-2 P.H CH-4 PH 0101, 102, 101,108,501,502 2SC458LG or 2SC631-71 0103 0106, 0 109Q112J. 0115,Q 116, 0503050 . 2SC458L 12 Q VR3 50K A Se Oso6 05os 4 6 VR4

10、SOKA Q113, 114,509,510 0115-118,511514 0201, 202 0203, 204 :2SC733 IN60 2SC971) SMl50-0I SCHEMATIC DIAGRAM 1 4 _ _J 1 4 X09-0005-21 S,o CH-2 LINE OUT CH-3 LINE OUT R402 I.BK CH-4 LINE OUT S5 S1 CH-I RECORDING SW (PLAYBACK POSITION) S6 S2 CH-2 RECORDI SW (PLAYBACK POSITION) S1 S3 RECORDING EQ SW (19c

11、m/sec POSITION) Se S4 PLAY BACK EQ SW ( 19cm/sec POSITION ) S9 VRS IOK A X09-0005-2 1 X09-0006-02 23 1 9 21 r-, 3 I ,- 0101 0103 -7 0105 S3-1 i2 qi ,-, I Q 7 OJO Q o - 0 3 uc;: + cQ Q I ic Q + er I er Q er OJ C- 112 6, er 1 25 I ic I i2 RIOS I it 7 470K + I icN u I rnQ f2 u N .0q uo 0 0 er 0 ii u ii

12、 L.J EAR:H L _ _j L-0102 _ 0104 -0106 -S3-2 _ .J ! 24 20 22 VR6 4 13 X00-0007-02 r +C209 100) 35V N m 0 i,! +C208 N 1000 35V N OJ - +C207 1000 35V c0 S; C- fl 7 0 fl 20 S7-s S1-4 0 a 30 I 4 0 S2-4 I I I L ZIV RED ORG BRN 0 BLK RED YEL ZIV RED 7V BLU 0 BLU PLAY BACK EQ SW(19cm/sec POSITION) S,o . HEA

13、D PHONE SW ( FRONT POSITION) MUTING SW (OFF POSITION) S11 TAPE SELECTOR SW (REGULAR POSITION) MODE SW 4CH. ST. L. R.(4CHANNEL POSITION) S12 50/GOHz SW (50Hz POSITION) CH-I MONITOR SW (TAPE POSITION) S1 3 : AUTOMATIC STOP SW (OFF POSITION) CH-2 MONITOR SW (TAPE POSITION) S14 : POWER SW (OFF POSITION)

14、 1 5 1 7 28 1 8 1 6 X CH-2 u-o- E. H AC IOOV 50/GOHz (120V 230V 250V) KW-6044 9 Fig. 1 shows an explanatory view giving relative positions of various levers, and idlers with respect to control lever being in the STOP Position. 1. STOP With cam plate and lever 2, the pinch roller is segregated from t

15、he capstan, and the pad from the head. The tape shifter is projected in front of the head. Idler 1 is not brought against motor pulley and flywheel, and REW roller and idler 2 are set free to move from side to side. The brake comes in touch with supply reel table and take- up reel table. Speed can b

16、e changed arbitrarily because the speed changeover mechanism is released from lever 4. BRAKE BACK TENSION (1) LEVER (6) 10 ROUND BELT (1) ROUND BELT (2)_ ROUND BELT (3) SHIFTER Fig. 1 OPERATION 2. FWD With control lever set at a required position, set the machine at FEW, and through the medium of ca

17、m plate and lever 2, pinch roller will be brought against capstan, and pad against the head. Thus, the tape shifter will fall backward of the head. Brake will be released from reel table through the medium of lever 1 and lever 3. Also backtension 2 is released from the reel table, but back- tension

18、1 alone remains in contact with the reel table. Idler 1 is brought against motor pulley and flywheel by the force of coil spring 3, whereby the motor drive force is commu- nicated from motor to motor pulley, idler 1, flywheel, square belt and take-up reel table in the said order. Other REW roller an

19、d idler 2 are held in the same position as in the case of STOP, and have nothing to do with the FWD position. During FWD, the speed changeover mecha- nism is locked by lever 4, and cannot be meddled with. LEVER (3) TAKE UP-REEL table CAM PLATE SPRING (2) BACK TENSION (2) SOU ARE BELT LEVER (1) SPRIN

20、G (1) LEVER (2) CONTROL LEVER SHAFT I r I 3. PAUSE When the control lever is set at PAUSE, pinch roller and pad are segregated from capstan and head respectively through the medium of cam plate and lever 2. (Clearance is less than in the case of STOP.) Tape shifter, however, is left backward away fr

21、om the head. The brake functions just in the same way as in the case of FWD. While idler 1, REW roller and idler 2 are in the same position as in the case of FWD, take-up reel table cannot run because the disc (felt) of take-up reel table (to be explained later) is released. During PAUSE, speed chan

22、geover cannot be made. 4. FAST FORWARD When control lever is set at F. F. pinch roller, pad and tape shifter resume just the same conditions as in the case of STOP. Brake is released through the medium of lever 1 and lever 3 from supply reel table and take-up reel table. Whereas back tension 1 and b

23、acktension 2 are held in close contact with motor pulley and flywheel as in the case of FWD, REW roller gets shifted rightwards through the medium of lever 1 and lever 6, getting idler 2 brought in contact with take-up reel table. Thus, power is transmitted from motor to motor pulley, round belt 1,

24、REW roller, idler 2 and take-up reel table in the said order. Simultaneously with this, power is also transmitted to motor pulley, idler 1, flywheel, square belt, take-up reel table and disc (felt) in turn. Since the disc (felt) of take-up reel table has been released, the power transmission through

25、 these two different routes cannot be compounded at take-up reel table. 5. REWIND When control lever is set at REW, pinch roller, pad and tape shifter assume the same conditions as in the case of STOP. Just as in the case of F. F. brake is released from reel table, and backtension 1 from supply reel

26、 table through the medium of lever 1 and lever 6. But, back- tension 2 is applied onto take-up reel stronger than is in the case of STOP. On the other hand, idler 2 is in the same position as in the case of STOP, and the poewr is commu- nicated from motor to motor pulley, round belt 1, REW roller an

27、d supply reel table in the said order. 6. SPEED CHANGEOVER MECHANISM Fig. 2 shows a drawing of the speed changeover mechanism (7-1/2, 3-3/4, 1-7/8 ips). The said figure refers to 3-3/4 ips. By turning speed changeover cam set on the speed c;hangeover shaft, elevator shaft is moved up or down. (strok

28、e: 5.5 mm) Thus, idler 1 caulked to elevator shaft through the medium of lever 5 is moved up or down along with the movement of elevator shaft. speed change- over cam I Elevator shaft Speed change- ,. over shaft Fig. 2 7. RECORD LOCK MECHANISM Motor pulley Screw with hexagon hole Fig. 3 shows a draw

29、ing of the record lock mechanism viewed from the back of the machine. When control lever is set at STOP, lock lever attached to pushbutton switch is depressed by the function of lever 7, spoke and lever 8 through the medium of record lock cam set on the control lever shaft,making its internal mechan

30、ism actuated. (See full line) When control lever is changed from STOP to FWD, the record lock mechanism functions to establish the state shown by broken line. Similarly, by the selection of PAUSE,F. F.and REW, the states of broken line, full line and full line are established respectively. (Note tha

31、t the positions of record lock cam changes by states.) Lock Push button lever for record Record lock Fig. 3 Control lever shaft 8. EQUALIZER CHANGEOVER MECHANISM Fig. 4 shows a back view of the equalizer changeover mechanism. The movement of equalizer changeover cam set on speed changeover shaft is

32、communicated to equalizer changeover switch through changeover lever. EO. changeover lever (C) EO. changeover lever (B) !: 0 . changeover -I t-;=1=-,;=,=-,t-, lever (A) EO. changeover cam Speed changeover Adjusting plate shaft Fig. 4 11 9. TAPE COUNTER The tape counter used is a pushbutton reset typ

33、e decimal four-digit counter which can be reset to O by one-touch action. Turn of reel table is communicated to intermediate pulley through the medium of round belt 2, which drives the counter pulley to register the number of revolutions of the reel table on tape counter. (See Fig. 1) 10. AUTOMATIC

34、SHUT - OFF MECHANISM Fig. 5 shows a drawing of the shut-off mechanism. The tube is filled up with silicon grease of some#500,000. Arm of the shut-off mechanism is smoothly driven by the dragging force of the grease. The position of arm is shown in Fig. 5 with respect to ON-OFF operation of the switc

35、h. Tubular oil shell Arm Micro SW , Switch ON , la, his :ide 1 , (LEFT) if I I 0 Swi,ch OF) J 5 L- at th is position I-13 T 1mm Fig. 5 11. REW ROLLER SLIP ME CHAN ISM Fig. 6 shows REW roller slip mechanism. The driving force of motor is communicated by means of round belt 1 to pulley, and the upper

36、roller is thereby turned by the friction force of slip ring (24-09-31 ). The effect of this ring is regulated by the pressure of coil spring. Round belt ( 1) 12 Roller shaft I E washer (4) Nylon washer (4.6p X 12ip X 0. 5t) Stop ririq (7p x 111 Washer (24-09-13) Nylon washer (7.1x 0.3t) -Oil spring

37、(24-09-8) 0 -Roller Ring 124-09-32) Pulley Oil seal ring (53-08-32) Fig. 6 1. Brake adjustment No particular adjustment is required for the brake of this machine. It may happen, however, that the following procedures be taken when the brake ratio gets out of order by soiled brake lining. (Fig. 7) Re

38、move E-washer from both sides which have secured the brake, and pull the brake out. Clear the foreign objects of brake lining with a piece of gauze moistened with alcohol, or replace it with a new one. In time with this, clean side faces (with which the lining gets in contact) of the both reel table

39、s. Supply reel table Take-up reel table, Brake lining Tapping screw Fig. 7 2. Adjustment of winding torque Fig. 8 shows a structual view of the take-up reel table. In a FWD state, lever 9 which has been locked by lever 10 is released, and is th rusted up with A as a fulcrum, whereby pulley and disc

40、are brought in close contact with each other to drive take-up reel by. square belt. The standard winding torque ranges from 160 g-cm to 400 g-cm. If the running is found irregular, wear of disc, abnormal contact between disc and pulley, and improper torque (too strong or too weak) are suspected. a)

41、Torque adjustment The torque can be adjusted by means of coil spring which is accessible from the back of the machine. b) Replacement of take-up reel table and disc Remove brake first. (Refer to item 1 Brake adjust- ment.) Remove truss screw and polysl ider washer from take-up reel shaft, pull reel

42、table out, and renew disc. c) d) 3. ADJUSTMENT OF MECHANISM Replacement of pulley After step b) above, remove polyslider washer and E washer from the intermediate section of the reel shaft, and take pulley away while disengaging square belt. Adjustment of reel table thrust play The reel table thrust

43、 play can be adjusted by adjusting the thickness of polysl ider washer on the upper part of reel shaft. The thrust play should be larger than 0 but not in excess of 0.3 mm. Adjustment of backtension In a FWD state, backtension can be obtained by the close contact of supply reel table to felt as il l

44、ustrated in Fig. 9. a) Adjustment of backtension The backtension can be adjusted by means of coil spring. b) Replacement of supply reel table Remove the brake. (Refer to item 1 Brake adjust- ment.) Remove truss screw and polyslider washer from supply reel table shaft, and take-up reel table off whil

45、e disengaging round belt 2 for counter driving. Polyslider washer (5.1/) X 7 X 0.5t) Take-up reel table Polyslider washer (6/) X 12 X 0.3t) E washer- Square belt Disk (felt) (21-08-31) Pulley =;=A= Mechanism chassis Lever ( 10) Lever (9) Polyslider washer (6.2x 14x 0.51) Coil spring Fig. 8 13 4. a)

46、b) Truss screw (3 x 6) Supply reel table Round belt Backtensio belt Fig. 9 Adjustment of thrust play of the flywheel Thrust play adjustment As will be clear from Fig. 10, the thrust play in the axial direction of flywheel is expressed in terms of gap between nylon washer on flywheel and housing of head panel. It is required to be less than 0.5 mm as standard. If the thrust play is increased excessively, it could cause troubles, and the adjustment is needed. Replace 0.3 mm nylon washer shown in Fig. 10 with a suitable nylon washer, or lay another was