Akai-GXC570Dll-tape-sm 电路图 维修手册.pdf

《Akai-GXC570Dll-tape-sm 电路图 维修手册.pdf》由会员分享，可在线阅读，更多相关《Akai-GXC570Dll-tape-sm 电路图 维修手册.pdf（71页珍藏版）》请在收音机爱好者资料库上搜索。

1、SERVICE MANUAL PARTS LIST RadioFans.CN 收音机爱 好者资料库 + PRON SoH shoe Loves Satay ne co PX re Lien AKATI STEREO CASSETTE DECK mover GXC-570D Il SECTION 1 SERVICE MANUAL .-555- 3 SECTION 2 PARTS LIST .000 ee eee ees 39 SECTION 3. SCHEMATIC DIAGRAM .-.- 64 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 I

2、l. Il. IV. Vil. VII. IX. SECTION 1 SERVICE MANUAL TABLE OF CONTENTS TECHNIGAL- DATA (carcoeie MAAAd Go ee Va RNA dre ON weitere dale CaS dee Be BOS 4 DISMANTLING OF UNID ocd ose bs ga ore tet a haw et oad aoe nena 5 CONTROLS 4.56055 Seb ohh GOR eek ob a Sh Re i OEE EES Hee PEERS 6 PRINCIPAL PARTS LO

3、CATION . 0.000 cece eee ences Bic aad ateabit wien 4 CIRCUIT OPERATING PRINCIPLES .0.0.0 00 ccc eee cence ene eet eee tees 8 1. SYSTEM CONTROL OPERATION .0. 0.000 cece cc eet eect ee ene ve 8 2 TOUCH. BUTTON OPERATION fx o503 ain cate iaita beater tate Se eee aed Ree a6 16 MECHANISM ADIUSTMENT 6 0:

4、cc60o-ov doa gua cd FEE EERE OEE OES SEES Hews 18 1. FLYWHEEL THRUST LOOSE PLAY ADJUSTMENT . 0.00000 cee eee ee eee ees 18 2. REEL TABLE INSTALLATION POSITION ADJUSTMENT . 0.000000 e ee eues 18 3. PLAY PLUNGER INSTALLATION POSITION ADJUSTMENT .0 00002 eee eee 19 4. PAUSE PLUNGER INSTALLATION POSITIO

5、N ADJUSTMENT . 0.200000 eee 19 5. PINCH ROLLER PRESSURE ADJUSTMENT .00000505 ree ee She Be He yy Bed 20 6. TAKE-UP TORQUE AT VARIOUS MODES AND TORQUE MEASURING METHOD . 20 7 LID PANEL POSTTION ADJUSTMENT 4%. .i520iis tees Po a ENG Ne ee SS 20 HEAD ADIUSIMENT. | iis soos acne ovaG as ahacd ee Oe kw h

6、oe eshte oes kates 21 1. TAPE GUIDE HEIGHT ADJUSTMENT . Bes dates, Brad Noa Lea sind ale tone Mie 21 2, HEIGHT ADJUSTMENT OF RECORDING/PLAYBACK COMBINATION HEAD .- me 3. AZIMUTH ALIGNMENT ADJUSTMENT OF RECORDING/PLAYBACK COMBINATION HEAD . 21 AMPLIFIER ADIUSIMENT 6.45003. ut toca UV edie iad raeecta

7、bsdtaed gene ewe es 22 DC RESISTANCE OF VARIOUS COILS: 2. oie. Sa bea inde pede ye oe ed eae Sees 24 CLASSIFICATION OF VARIOUS P.C BOARDS . 000 cece eee ete ee teens 25 1. RELATION OF P.C BOARD TITLE AND IDENTIFICATION NUMBER . 7 gianatespeishys 26 2. COMPOSITION OF VARIOUS P.C BOARDS . 00 cece ee e

8、nna 26 For basic adjustments, measuring methods, and operating principles, refer to GENERAL OPERATING PRINCIPLES AND ADJUSTMENTS. I. TECHNICAL DATA a ETE Sal TRACK SYSTEM 4 track, 2 channel Stereo System TAPE _| Philips Type Cassette TAPE SPEED 1-7/8 ips (Pitch Control +6%) WOW peclciveay | = PSE Hb

9、scscccnes GE Ee) Ee A) oe eos, FS ee Q : (TP ae GPE ae ss L i? : H H | ith | POWER SUPPLY PC BOARD (C5206) at - a o-o- a MUTE A 60 _ SYSTEM CONTROL PC BOARD (CI-5209A) = =e a a) 1 lett ose : “Lid ? ale alien iw pee | i 23 LR H atl g wat iL =) | AUTO STOP PC aon H -5209C) ray ne aS an ti ; on JoSyres

10、 waea drve| Lage| : if 1 ? d ag + at as at es tas | st eS) | es | GS) eS) | eee Sgt | ge mA a Yt ee WY deel and when TR2 is turned OFF, C3 is charged and this pulse is rectified at D1 and charged at C4 to increase TR3 base electric potential. TR3 is thereby turned ON. 2-3 WHEN THE FINGER TOUCHES THE

11、 BUTTON WHILE ANOTHER FINGER OR HAND IS TOUCHING THE DECK CHAS- SIS (Refer to Fig. 6) The above explains how a touch button operates with the human body as a signal source. It takes advantage of the fact that a human body can be used as a capacitor. As shown in Fig. 6, when the button and chassis ar

12、e both touched by the finger(s), it is the same as if a capacitor has been placed as shown in the circuit diagram. Electric charge of C2 discharges to RICoR4. As can be seen by the circuit, this discharging period is very short. During this short period of discharge, TR1 is turned OFF, TR2 collector

13、 electric potential increases, and C3 is charged. C4 is charged by the charging current of C3, and TR3 base electric potential increases. TR3 is there- by turned ON and functions in the same way as a micro switch. a SSS SS SS 17 Vi. MECHANISM ADJUSTMENT CAPSTAN CAPSTAN MOTOR FLYWHEEL B (RIGHT ) DRIV

14、E BELT EWN EEL FLYWHEEL A as ae (LEFT) ee eee ees mess = Lag a 0.05 to 0.15 mm MOTOR PULLEY FIXATION NUT ADJUSTMENT SCREWS Fig. 8 Flywheel Thrust Loose Play Adjustment 1. FLYWHEEL THRUST LOOSE PLAY AD- JUSTMENT (Refer to Fig. 8) Adjust by turning flywheel thrust loose play adjust- ment screws to obt

15、ain a 0.05 to 0.15mm of loose play when the flywheel is moved as indicated by the arrow mark. Tighten fixation nuts to maintain optimum adjusted condition. Paint lock the adjustment screws. 2. REEL TABLE INSTALLATION POSITION ADJUSTMENT (Refer to Fig. 9) Adjust until a clearance of approximately 3.2

16、mm is obtained between the mecha frame and the lower side of the reel tables pulley as shown in Fig. 9. Then, tighten the fixation screw firmly. MECHA FRAME FIXATION SCREW REEL MOTOR Fig. 9 ADJUSTMENT SCREWS .PLAY PLUNGER INSTALLATION POSI- TION ADJUSTMENT (Refer to Fig. 10) The clearance between th

17、e head base and head clutch plate when the plunger is moved as indicated in Fig. 10 at stop mode should be approximately 1.0mm. If not, adjust play plunger position with the adjust- ment screws in the direction as indicated by the PINCH ROLLER PINCH ROLLER Fig. 10 arrow mark. N H; 1 Mt yous OO) che

18、OO) CASSETTE TAPE PLAY POSITION PAUSE POSITION .PAUSE PLUNGER INSTALLATION POSI- TION ADJUSTMENT (Refer to Fig. 11) With the tape loaded, the Pause Plunger Solenoid is not completely pulled if the head base does not lower at all when the mode is changed from PLAY -to PAUSE. In order to allow Pause P

19、lunger to function completely and still have the head not lowered too HEAD BASE mre st a be PAUSE | PLUNGE ! S a) ADJUSTMENT SCREW Fig. 11 much, the head base should lower only 0.1mm (lower only slightly) when the mode is changed from PLAY to PAUSE as shown in Fig. 11. If you find that the plunger f

20、unction is not com- plete, adjust by lowering the Pause Plunger Instal- lation Position approximately O.lmm using the adjustment screw. et 19 PINCH ROLLER SPRING (LEFT) PINCH ROLLER (LEFT) be PANEL ADJUSTMENT SCREWS FRONT PANEL EJECT GUIDE Fig. 13 Left Side of the Deck H-PINCH ROLLER SPRING (RIGHT)

21、PINCH ROLLER (RIGHT) Fig. 12 5. PINCH ROLLER PRESSURE ADJUSTMENT (Refer to Fig. 12) Load a cassette tape, set the recorder in the play mode, then pass a string around the pinch roller shaft and the spring gauge as shown in Fig. 12. Pull the spring gauge as indicated by the arrow mark in the figure u

22、ntil the pinch roller parts from the capstan. Then, gradually weaken the pulling force, and the spring gauge value when the pinch roller comes in | contact with the capstan once again to start rotating. If the measurement value does not comply with the following values specified, replace the pinch r

23、oller spring. Specified Pinch Roller Pressure: Pinch Roller (Right) 400 50 grm Pinch Roller (Left) 300 50 grm . TAKE-UP TORQUE AT VARIOUS MODES AND TORQUE MEASURING METHOD Set a cassette torque meter on cassette base, and take a reading of the indication at each respective mode. Playback mode: 33 to

24、 55 grm-cm Fast Forward mode: 80 to 120 grm-cm Rewind mode: 80 to 120 grm-cm . LID PANEL POSITION ADJUSTMENT (Refer to Fig. 13) In case the lid panel is not level with the front panel, adjust by shifting the eject guide as indicated by the arrow mark in Fig. 13. If the upper part of the lid panel is

25、 tilted inward, move the eject guide upward, and if tilted outward, move the eject guide down- wards. 20 VIL HEAD ADJUSTMENT TAPE GUIDE (A) TAPE GUIDE(C) TAPE GUIDE (B) CAPSTAN TAPE GUIDE(A) HEIGHT ADJUSTMENT NUT TAPE GUIDE (B) HEIGHT ADJUSTME:!T NUT / Vers ae Ee mT ae a al poo _Fa fi ERASE HEAD REC

26、/PB COMBINATION E4-165 HEAD PR4-2 Fig. 14 1. TAPE GUIDE HEIGHT ADJUSTMENT (Refer to Figs. 14, 15) 1) When using an ordinary cassette, the tape guides and heads, etc. are not visible. As shown in Fig. 15 use a cassette tape from which part of the cassette case has been cut out and a mirror installed

27、for easy visibility of the head area when making tape guide height adjustment. 2) At playback mode, using the erase head guide (C) shown in Fig. 14 as standard for height, adjust tape guide (A) and tape guide (B) height with tape guide height adjustment nuts so that the tape runs smoothly and does n

28、ot catch on the tape guides. 2. HEIGHT ADJUSTMENT OF RECORDING/ PLAYBACK COMBINATION HEAD (Refer to Fig. 14) 1) Utilize the cassette tape used in Tape Guide Height Adjustment above, and playback the leader tape part of cassette tape. 2) As shown in Fig. 14 adjust head height with screws (A), (B) and

29、 (C) until the upper edge of the tape is the same height as the upper edge of the left channel REC/PB Combination head core. fo) es MIRROR 3. AZIMUTH ALIGNMENT ADJUSTMENT OF RECORDING/PLAYBACK COMBINATION HEAD (Refer to Fig. 14) 1) The cores of recording and playback heads are mounted in a single he

30、ad holder to form the recording/playback combination head otherwise known as the New GX Head. Both recording and playback head cores move when azimuth align- ment is adjusted. To obtain optimum playback head core azimuth alignment, follow the instruc- tions 2) 5) carefully. 2) Playback a 10 kHz azim

31、uth alignment adjustment test tape and adjust the adjustment screw (A) until the output level of both channels are at maximum. 3) Invert cassette and see whether there is an output level difference from the above. If there is a dif- ference, repeat (2) and readjust. 4) Record a 10 kHz, 20 VU signal

32、from the audio frequency oscillator. , 5) Rewind and check for any fluctuation in the out- put level at playback. NOTES: 1. Be sure to clean the heads prior to head ad- justment. 2. Be careful not to use a magnetized driver or other magnetized tools in the vicinity of the heads. 3. Be sure to demagn

33、etize the heads with a Head Demagnetizer before and after head adjustment. 4. When a mirror installed cassette test tape as shown in Fig. 15 is required, it can be ordered from AKAI Electric Co. rr creat 21 AMPLIFIER ADJUSTMENT Vil. QN LCANNVHS LHOIY, SesDo!pul sequin jiod 40% SUA a juauyjsnfpd up B

34、ujmojjoyq, 4as4e SUL 102 SYA tn 1 ayo! LYA oO wr = So fe) S a V 7, . ae saa 2 ce stop | VR350KB ovU to “SOURCE”. A dase a Oscillato (CI-5203) Indication Set Meter Selector as aa Switch to “VU”. pea al asin : Me stop | VR4S0KB -8 VU Set Meter Selector e 7 j * “PE 27. Adjustment Oxcilistor (CI-5203) I

35、ndication Switch to AK Ba 5 PB Equalizer 10 kHz PLAY VR9 2 kB 90 dBm Set Monitor Switch | Adjustment Test Tape (CI-5202A) to “TAPE”. CrO, Position Meet 3 oie poe a . Frequency C000 Hz | REC! | VR8200KB | iy qo H, | Set. Tape. Selector Response ; PLAY | (CI-5202A) ; Switch to “CrO,”. : 20 VU flat Adj

36、ustment : recording response LN Position LN blank 1,000 Hz to ; lect me Frequency tape, 1,000Hz, | REC/ | VR710kB | 10,000Hz ae Perris ee Response 10,000 Hz, 20VU | PLAY | (CI-5202A) flat : ; F (Refer to NOTE 5) Adjustment recording response 4 LH Position LH blank 1,000 Hz to ; t : Frequency tape, 1

37、,000Hz, |REC/ | VR620kB | 10,000 Hz ae ets a Response 10,000 Hz, -20 VU | PLAY | (CI-5202A) flat : ; : (Refer to NOTE 5) 8 Adjustment recording response Fe-Cr Position Fe-Cr blank 1,000 Hz to Set “Tape : Selector 9 Frequency tape 1,000 Hz REC/ VR5 20 kB 10,000 Hz Switels A “Be-Cy” Response 10,000 Hz

38、, -20 VU | PLAY | (CI-5202A) flat : ; . (Refer to NOTE 5) Adjustment recording response i Bihs ah aa REC/ | VR110KB | 5.5 dBm Adjustment Recording PEAY, | (Chace) = Cem Rec Amp 100 kHz FL1 Minimum AC Set Monitor Switch 11 Bias Leak from an REC ; KM10D 100B Voltmeter to “SOURCE”. Adjustment oscillato

39、r (CI-5202A) indication (Refer to NOTE 8). : 19 kHz FL2 Minimum AC Set MPX Filter 12 ee from an REC | KMI0D19B | Voltmeter | Switch to “ON”. 4 | oscillator (CI-5202A) indication (Refer to NOTE 8) M Switch it it PB Amp FL3 Minimum AC a eee 13 Bias Leak REC |KMI0D100B | Voltmeter | oo oto. switch ae A

40、djustment (CI-5202A) indication “C10,” L ae Chart-2 23 er S NOTES: mB WN eK On . Set Pitch Control and Rec Calibration Volumes to center position. . Except for Steps #6, 8, 9 and 13, set Tape Selector to LN position. . Set Dolby N.R. switch, Cal. Tone Switch and Limiter Switch to OFF position. . Exc

41、ept for Step 12, set MPX Filter switch to OFF position. . If a flat characteristic cannot be obtained from 1,000 Hz to 10,000 Hz at LN, LH, or Fe-Cr positions, fine adjust at VR7 (LN), VR6 (LH) or VRS (Fe-Cr) respectively. . Because each of these adjustments are vital to perfect Dolby N.R. circuit o

42、peration, be sure that they are carried out with as little error as possible. . Use the following cassette measuring tape: LN Tape: Fuji FL C-60 LH Tape: Maxell UD C-60 CrO, Tape: TDK SA C-60 Fe-Cr Tape: SONY Duad C-60 . Unless the core is moved intentionally this adjustment is not necessary. . No a

43、djustment is required for the adjustment core VL1 (33Y-740) of the recording equalizer. Do not touch it. IX.DC RESISTANCE OF VARIOUS COLILS 24 bo Parts Designation DC Resistance Recording/Playback PR4-2 REC: 22 ohms +5% Combination Head PB: 250 ohms 5% Erase Head E4-165 2.5 ohms Play Plunger TDS-12E

44、 120 ohms +10% | Pause Plunger P-120F 540 ohms +10% Relay MZ-24HG 1,280 +130 ohms Relay L Type L24 1,600 +160 ohms Chart-3 X. CLASSIFICATION OF VARIOUS P.C BOARDS 1. RELATION OF P.C BOARD TITLE AND IDENTIFICATION NUMBER P.C Board Title : P.C Board Number Amp P.C Board CI-5202A | Peak Lamp P.C Board

45、CI-5202B LED P.C Board CI-5202C Peak Circuit P.C Board CI-5203 Housing Lamp P.C Board lt CI-5204 Monitor SW. P.C Board CI-5205 Power Supply P.C Board CI-5206 Power Supply SW. P.C Board (A) CI-5207 Power Supply SW. P.C Board (B) CI-5208 Sys. Con P.C Board CI-5209A Remote Control P.C Board CI-5209B |

46、AS P.C Board CI-5209C Toush Senser P.C Board | CI-5210C Door Open P.C Board CI-5211 Lamp P.C Board CI-5237 | Noise Filter P.C Board CB-2027 Chart-4 25 2. COMPOSITION OF VARIOUS P.C BOARDS 1) AMP P.C BOARD CI-5202A and LED P.C BOARD CI-5202C PITCH CONTROL PHONE LEVEL| gob 280871 BCE 2scril TAPE SELEC

47、TOR) ves 2SK68A tc ac ARABBOBE lela els1ofo/2 Sa Bae L 4 8893 ele 0 F38a wizle*si2(2/2 a BRAG 8181s lsl2 18 sls S888 5 62|8/315|/s 5 Roe l2/8fel 1 aelsizlsleie a) speleigleteia a8 ely 2|gi8 2/2/38 /2)2/818/3 A1ss|Bleislels ba ppp isiei ty ale eas 212lelojwlule i ox ir Sete 2 (elf = Beso Rows 2 288 /

48、EElE etme: ofy Motu Roltau es $2701 9129, as pile E ESC sortie t erg e ) mar?) | V60z-19 3 PMedatliale a amc HM o S 2 pezase eveldsz veozs-19 ) wa oO 94 92 ; Qa 2 4 / veozs-i9 ) aNd Osrassouorrna (2) fw ! C= a SNOW ING ) e = weowovanme(S) | iee-19 Ps) gozs-19” o wd : xs ) iH) 4 nz a Lene VANE % )-aay