Yamaha-MT-400-Service-Manual电路原理图.pdf

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1、SERVICE MANUAL PA 011437 19981101-45000 1.95K-998 Printed in Japan 98.10 HAMAMATSU, JAPAN CONTENTS SPECIFICATIONS. 3/4 DIMENSIONS. 4 PANEL LAYOUT. 5 CIRCUIT BOARD LAYOUT. 8 BLOCK DIAGRAM. 9 DISASSEMBLY PROCEDURE. 10 IC BLOCK DIAGRAM. 11 CIRCUIT BOARDS. 12 INSPECTIONS. 15/17 TROUBLE SHOOTING. 19 CIRC

2、UIT DIAGRAM. 21 PARTS LIST 4 4TR4 STEREO +6 +3 0 5 10 +6 +3 0 5 10 POWER AUX SEND STEREO INPUT METER SELECTREC SELECT MONITOR/PHONES ZERO STOP PITCH NOISE REDUCTION SYSTEM TAPE SPEED CONTROL 321 RL REC RECPLAYREWFFSTOPPAUSE OFF R 3 OFF L 2 OFF R 1 OFF L ON OFF ON OFF SYNC STEREO ST+CUE CUE MULTITRAC

3、K CASSETTE RECORDER MIC/LINE INPUT INSERT I/O INSERT I/O 12 12 3 45L6R8R7L 4.8/ 9.5 + LEVEL STEREO 7L8R 010 LEVEL5 L6R 010 LEVEL MINMAX 10 9 8 7 6 5 4 3 2 1 0 GAIN HIGH 10 9 8 7 6 5 4 3 2 1 0 LINEMIC 12+12 MID 12+12 LOW 12+12 AUX 1 010 AUX 2 MIXCUEMIXCUEMIXCUEMIXCUE 010 010 PAN INPUT-FLIP TAPE TAPE

4、MIC/ LINE MIC/LINE to L LR 1 GAIN HIGH 10 9 8 7 6 5 4 3 2 1 0 LINEMIC 12+12 MID 12+12 LOW 12+12 AUX 1 010 AUX 2 010 010 PAN INPUT-FLIP TAPE TAPE MIC/ LINE MIC/LINE to R LR 2 GAIN HIGH 10 9 8 7 6 5 4 3 2 1 0 LINEMIC 12+12 MID 12+12 LOW 12+12 AUX 1 010 AUX 2 010 010 PAN INPUT-FLIP TAPE TAPE MIC/ LINE

5、MIC/LINE to L LR 3 GAIN HIGH 10 9 8 7 6 5 4 3 2 1 0 LINEMIC 12+12 MID 12+12 LOW 12+12 AUX 1 010 AUX 2 010 010 PAN INPUT-FLIP TAPE TAPE MIC/ LINE MIC/LINE to R LR 4 MULTITRACK CASSETTE RECORDER RadioFans.CN 收音机爱 好者资料库 IMPORTANT NOTICE This manual has been provided for the use of authorized Yamaha Ret

6、ailers and their service personnel. It has been assumed that basic service procedures inherent to the industry, and more specifically Yamaha Products, are already known and under- stood by the users, and have therefore not been restated. WARNING :Failure to follow appropriate service and safety proc

7、edures when servicing this product may result in per- sonal injury, destruction of expensive components and failure of the product to perform as specified. For these reasons, we advise all Yamaha product owners that all service required should be performed by an authorized Yamaha Retailer or the app

8、ointed service representative. IMPORTANT :This presentation or sale of this manual to any individual or firm does not constitute authorization certifi- cation, recognition of any applicable technical capabilities, or establish a principal-agent relationship of any form. The data provided is belived

9、to be accurate and applicable to the unit(s) indicated on the cover. The research engineering, and service departments of Yamaha are continually striving to improve Yamaha products. Modifications are, therefore, inevitable and changes in specification are subject to change without notice or obligati

10、on to retrofit. Should any discrepancy appear to exist, please contact the distributors Service Division. WARNING :Static discharges can destroy expensive components. Discharge any static electricity you body may have accumulated by grounding yourself to the ground buss in the unit (heavy gauge blac

11、k wires connect to this buss.) IMPORTANT :Turn the unit OFF during disassembly and parts replacement. Recheck all work before you apply power to the unit. WARNING: CHEMICAL CONTENT NOTICE! The solder used in the production of this product contains LEAD. In addition, other electrical/electronic and/o

12、r plastic (Where applicable) components may also contain traces of chemicals found by the California Health and Welfare Agency (and possibly other entities) to cause cancer and/or birth defects or other reproductive harm. DO NOT PLACE SOLDER, ELECTRICAL/ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH

13、 FOR ANY REASON WHAT SO EVER! Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or expose eyes to solder/flux vapor! If you come in contact with solder or components located inside the enclosure of this product, wash your hands before handl

14、ing food. WARNING Components having special characteristics are marked and must be replaced with parts having specification equal to those originally installed. MT400 2 RadioFans.CN 收音机爱 好者资料库 SPECIFICATIONS 3 MT400 DC 12V (650 mA or higher) 388 x 102 x 354 mm 2.8 kg AC adapter KPA4N, KPA6N C4690 ca

15、ssette tapes (Type II) 4-track/4-channel, One-way Record-Play 4-track Record-Play, Hard Permalloy x 1, 4-track Erase, Ferrite x1 DC servo motor x1 4.8 cm/s, 9.5 cm/s Approximately+/10% 0.12% WRMS (9.5 cm/s) Approximately 120 seconds for a C60 tape Mixer Power Requirement Dimensions (WxHxD) Weight Op

16、tion for UK model EQ LOW/ShelvingBasic frequency: 80 Hz, Range: 12 dB MID/PeakingBasic frequency: 1 kHz, Range: 12 dB HIGH/ShelvingBasic frequency: 12 kHz, Range: 12 dB Tape Type Track Configuration Tape Heads Motor Tape Speed Pitch Control Wow & Flutter Rewind Time Recorder Overall Frequency Respon

17、se Overall S/N Ratio Overall Distortion Erasure Rate Noise Reduction 50 Hz14 kHz, +3/5 dB (9.5 cm/s, NR OUT) 80 dB/IHF-A (NR IN) at 3% distortion level 2.0% (400 Hz, 10 dB) 55 dB (1 kHz, 0 dB, BPF) dbx TYPE II Connections # of I/Os MIC/LINEx4 INSERT I/Ox2 STEREO INx2 AUX SENDx2 STEREO OUT L, Rx1 MON

18、ITOR OUT L, R x1 SYNC OUTx1 PHONES L, Rx1 I/O Specifications INSERT OUT CH 1, 2 Output Impedance: 100ohm Rated Load Impedance: 10 k or higher Rated Output Level: 10 dB (10 k load) PHONES (STEREO) Rated Load Impedance: 8 to 40ohm Rated Output Level: 30 mW+30 mW (40ohm load) Control Jack PUNCH I/OFoot

19、 switch: FC5 (optional) General 0 dB=0.775 Vrms. Tape Transport Frequency Response S/N Ratio (at rated input & output levels) 20 Hz20 kHz, +1/4 dB, MIC INSTEREO OUT LINE INMONITOR OUT 65 dB/IHF-A, MIC INSTEREO OUT (GAIN TRIM MAX) 70 dB/IHF-A, LINE INSTEREO OUT (GAIN TRIM MIN) MIC/LINE INSERT IN CH 1

20、, 2 STEREO IN Input Impedance: 10 k ohm Rated Input Level: 10 to 50 dB (CH fader at rated levels) Minimum Input Level: 56 dB (Gain trim max. CH fader max) Input Impedance: 10 k ohm Rated Input Level: 10 dB (CH fader at rated levels) Minimum Input Level: 16 dB (CH fader max) Input Impedance: 10 k ohm

21、 Rated Input Level: 10 dB (CH fader at rated levels) Minimum Input Level: 16 dB (Volume max) STEREO OUT L, R AUX SEND MONITOR OUT SYNC OUT Output Impedance: 1 k ohm Rated Load Impedance: 10 k ohm or higher Rated Output Level: 10 dB (10 k ohm load) Output Impedance: 1 k ohm Rated Load Impedance: 10 k

22、 ohm or higher Rated Output Level: 10 dB (10 k ohm load) Output Impedance: 1 k ohm Rated Load Impedance: 10 k ohm or higher Rated Output Level: 10 dB (10 k ohm load) Output Impedance: 1 k ohm Rated Load Impedance: 10 k ohm or higher Rated Output Level: 10 dB (10 k ohm load) 4 MT400 Unit : mm DIMENSI

23、ONS H:102 D:354 W:388 MT400 5 LEVEL 7L8R 010 LEVEL 5L6R 010 8 MONITOR/PHONES STEREO ST+CUE CUE STEREO LEVEL MINMAX 10 9 8 7 6 5 4 3 2 1 0 9 10 11 GAIN HIGH 10 9 8 7 6 5 4 3 2 1 0 LINEMIC 12+12 MID 12+12 LOW 12+12 AUX 1 010 AUX 2 MIXCUE 010 010 PAN INPUT-FLIP TAPE TAPE MIC/ LINE MIC/LINE to L LR 1 1

24、2 3 4 5 6 7 MONITOR LEVEL control MONITOR select switch STEREO fader 9 10 11 PANEL LAYOUT Input channels GAIN control EQ control AUX controls CUE control INPUT-FLIP switch PAN control Fader 1 2 3 4 5 6 7 Stereo Input LEVEL controls8 Monitor / Master Section MT400 6 12 13 14 15 16 17 18 19 20 PITCH c

25、ontrol Tape speed switch REC SELECT switches METER SELECT switch dbx switch ZERO STOP switch Tape counter Counter reset button Cassette compartment Recorder Section Transport Section 4TR4 STEREO METER SELECTREC SELECT ZERO STOP PITCH NOISE REDUCTION SYSTEM TAPE SPEED CONTROL OFF R 3 OFF L 2 OFF R 1

26、OFF L ON OFF ON OFF SYNC 4.8/ 9.5 + 12131415 1617 18 19 20 RECPLAYREWFFSTOPPAUSE 212223242526 button ( ) PLAY button ( ) REW button ( ) FF button ( ) STOP button ( ) PAUSE button ( ) 21 22 23 24 25 26 REC MT400 7 36 37 38 39 40 POWER ON/OFF switch DC 12V SYNC OUT MONITOR OUTs STEREO OUTs 30 31 32 33

27、 4 +6 +3 0 5 10 +6 +3 0 5 10 POWER 321 RL REC 27 28 29 Meter Section AUX SEND STEREO INPUT MIC/LINE INPUT INSERT I/O INSERT I/O 12 12 3 45L6R8R7L 3132 30 33 PHONESPUNCH I/O 3435 SYNC OUTMONITOR OUTSTEREO OUT RLRL DC 12VPOWER ON/OFF 3637383940 Input / Output Section Front Panel Rear Panel Level meter

28、s REC SELECT indicator POWER indicator 27 28 29 MIC/LINE INPUTs 1-4 INSERT I/O STEREO INPUTs AUX SEND 34 35 PHONES PUNCH I/O MT400 8 MIX 1/3 SUB 1/3 SUB 3/3 MIX 3/3 REC 1/2 SUB 2/3 MIX 2/3 REC 2/2 CIRCUIT BOARD LAYOUT 9 BLOCK DIAGRAM MT400 IC101 31IC103 27 IC104 31 IC201 31 IC303 27 IC105 31 IC106 I

29、C107 IC110 IC110 IC111 IC108 IC109 2167 2167 2167 2167 21 31 67 67 MT400-3000 0 10 DISASSEMBLY PROCEDURE Fig.1 MT400 320:Bind Head Tapping Screw-P 3X10 MFZN2BL (EP630660) 320 320 1.Lower Case 1-1Remove the seven (7) screws marked 320. The lower case can then be removed. (Fig.1) 4.SUB 2/3, 3/3 Circui

30、t Boards 4-1Remove the lower case. (See Procedure 1.) 4-2Remove the three (3) screws marked 320d and the two (2) screws marked 320e. The SUB2/3 circuit board can then be removed. (Fig.2, Fig.3) 4-3Remove the four (4) screws marked 320f. The SUB 3/3 circuit board can then be removed. (Fig.2) 2.Casset

31、te Mechanism 2-1Remove the lower case. (See Procedure 1.) 2-2Remove the five (5) screws marked 320a. The cassette mechanism can then be removed. (Fig. 2) 3.REC 1/2, 2/2 Circuit Boards 3-1Remove the lower case. (See Procedure 1.) 3-2Remove the cassette mechanism. (See Procedure 2.) 3-3Remove the six

32、(6) screws marked 320b. The REC 1/2 circuit board can then be removed. (Fig.2) 3-4Remove the two (2) screws marked 320c. The REC 2/2 circuit board can then be removed. (Fig.2) 320e 320f320b320a320c 320b 320c 320a 320b 320b320b 320f 320d REC 1/2 SUB 2/3 SUB 3/3 Fig.2 Fig.3 REAR FRONT REARFRONT Bottom

33、 Top 11 Fig.4 MT400 11A 2 3 4 5 6 7 1Y 2A 2Y 3A 3Y VSS8 9 10 11 12 13 14VDD 6A 6Y 5A 5Y 4A 4Y TC4069UBP(IG001720) Hex Inverter 1Input (Output)1 2 3 4 5 6 7 Output (Input)1 Output (Input)2 Input (Output)2 Control2 Control3 VSS8 9 10 11 12 13 14VDD Control1 Control4 Input (Output)4 Output (Input)4 Out

34、put (Input)3 Input (Output)3 TC4066BP(IX631591) Quad Bilateral Swich BA7755A(XH519A00) Head Switcher BA6137(XA534A00) LED Driver AN6292NK(XJ637A00) Dual dbx NR NJM2068LD(XM356A00) NJM4558L(IX614610) M5216L(XB419A00) M5218AL(XH471A00) Dual Operational Amplifier 1 A 2345678 INV+INOUT AAA +VIN+INOUT BB

35、B + B + 12345 VCCSWGNDCTRL1CTRL2 D1 + + Constant Current Circuit 1 D2 2 D3 3 D4 4 GND 5 D5 6 Amp Output 7 IN 8 VCC 9 389 20 21 26 ENPHASIS BAND PASS FILTER IN REC OUT 1 28 GND+ 2 27 R/P INR/P IN ENPHASIS 4 LINE OUTLINE OUT 5 24 ENPHASISENPHASIS 6 23 CCA-A OUTCCA-A OUT 7 22 CCA-B INCCA-B IN BAND PASS

36、 FILTER IN REC OUT 10 19 BAND PASS FILTER OUTBAND PASS FILTER OUT 1113 1618 LEVEL SENSOR IN TIMING CURRENT ADJ. LEVEL SENSOR IN 12 17 TIMING CAP.TIMING CAP. DECODE / ENCODE SW 14 15 SW B CH. A CH. + DE OFF LINE AMP. OFF ENENDE + + + DE OFF BUFFER EN EN OFFOFF DEDEEN + EN CCA-B CCA-A REC OUT AMP. OFF

37、 LEVEL SENSOR OFF DEDEEN + + EN PHASIS AMP. 25 IC BLOCK DIAGRAM 5.SUB 1/3 Circuit Board 5-1Remove the lower case. (See Procedure 1.) 5-2Remove the PITCH knob of the TAPE SPEED CONTROL on the upper case and the six (6) screws marked 320g. The SUB 1/3 circuit board can then be removed. (Fig.4) 6.MIX 1

38、/3 Circuit Board 6-1Remove the lower case. (See Procedure 1.) 6-2Remove the SUB 1/3 circuit board. (See Procedure 5.) 6-3Remove the knob on the upper case and the twelve (12) screws marked 320h. The MIX 1/3 circuit board can then be removed. (Fig.4) 7.MIX 2/3, 3/3 Circuit Boards 7-1Remove the lower

39、case. (See Procedure 1.) 7-2Remove the four (4) screws marked 320I on the plate. The plate with the MIX 2/3 and 3/3circuit boards can then be removed. (Fig.4) 7-3Remove the holding plate of each jack. The each circuit board can then be removed. 320h 320h MIX 1/3 320i MIX 2/3 320h 320g SUB 1/3 320g M

40、IX 3/3 320i FRONT REAR 12 MT400 to REC 1/2-CN504 to SUB 1/3-CN101 to MIX 3/3-CN110 to MIX 2/3-CN109 to SUB 2/3-CN107 to MIX 2/3-CN112 to MIX 2/3-CN108 to SUB 1/3- CN102 CIRCUIT BOARDS MIX-1/3 Circuit Board Component side MIX : MT400-3400 from MIX 1/3-CN101 1-INSERT I/O MIC / LINE INPUT 2-INSERT I/O

41、from MIX 1/3-CN111to MIX 1/3-CN109 12345L6R7L8R STEREO INPUT from MIX 1/3-CN103 12 AUX SEND SYNC OUT from MIX 1/3-CN104 from REC 1/2-CN507 LR STEREO OUT LR MONITOR OUT to REC 1/2-CN506 DC INPOWER SW. to REC 1/2-CN501 to REC 1/2 -CN502 from MIX 1/3 -CN106 from MIX 1/3-CN107 13 MT400 MIX-2/3 Circuit B

42、oard Component side MIX-3/3 Circuit Board Component side SUB-1/3 Circuit Board Component side SUB-2/3 Circuit Board Component side SUB-3/3 Circuit Board Component side MIX : MT400-3400 SUB : MT400-3600 14 from REC 1/2-CN503 PUNCH I/OPHONES to REC 2/2-CN508 from SUB 1/3-CN104 from SUB 3/3-CN109from S

43、UB 1/3-CN103to SUB 2/3-CN108 from MIX 1/3-CN105 MT400 REC-1/2 Circuit Board Component side REC-2/2 Circuit Board Component side REC : MT400-3500 MT400 15 INSPECTIONS A. Preparation 1. Set Up Set the level controls and switches as follows (unless otherwise specified). 1-1 CH 1, 2, 3, 4 GAIN VOLUMELIN

44、E EQ/ HIGH, MID, LOW VOLUMECENTER AUX 1, 2 VOLUMEMINIMUM CUE VOLUMEMINIMUM INPUT FLP SWITCHMIC/ LINE PAN VOLUMECENTER CH FADERMINIMUM 1-2 CH 5/6, 7/8 LEVEL VOLUMEMINIMUM 1-3 MASTER MASTER FADERMINIMUM MONITOR LEVEL VOLUMEMINIMUM MONITOR SELECT SWITCHSTEREO 1-4 RECORDER REC SELECT SWITCHOFF dBx SWITC

45、HOFF 1-5 MECHANISM PITCH CONTROL VOLUMECENTER TAPE SPEED SWITCH9.5 cm/sec ZERO STOP SWITCHOFF 1-6 OTHER METER SWITCH4TR 2. Input /Output The handled signal level is assumed to be 0 dB = 0.775 V. The input levels should be sine wave 1 kHz and -10 dBm, unless otherwise specified. Each output terminal

46、should have the following load resistance. STEREO OUT10 kohm MONITOR OUT10 kohm AUX OUT10 kohm SYNC OUT10 kohm PHONES (STEREO)40 ohm 3. Position of CH / MASTER FADER When the input levels for each channel are as specified, the CH FADER is positioned so that the ST/OUT (L/R) is at -10 dBm and the poi

47、nter is between 7 and 8. 4. Tapes Alignment tape TDK:AC514 (VU167300) MAXELL: UD II U60 Test tape A.BEX:TCC-121(TX911840) 315 Hz, -4 dB, 160 nWb / m A.BEX:TCC-151(TX800460) 6.3 kHz A.BEX:TCC111(TX911820)3 kHz, -10 dB A.BEX:TCW211(TX911550) 1.5 kHz, -4 dB MT400 16 5. Test equipment required Low Frequ

48、ency Oscillator AC voltmeter (level meter) DC voltmeter Oscilloscope Frequency Counter Mirror Cassette SONY:MC112C (TX911100) Torque meter SONY:TW-2231 (TX913450), etc. 6. Mechanical adjustment 6-1 Tape running Check that a tape curl is not created when playing the mirror tape. When a tape curl occurs, adjust the height of the head after attaching a Y washer. 6-2 Torque check Check that the torque of each measurement i