Fostex-X24-mt-sm维修电路原理图.pdf

X-24 Service Manual Model multitracker RadioFans.CN 收音机爱 好者资料库 SAFETY INSTRUCTIONS Read instructions - All the safety and operating instruc- tions should be read before the appliance is operated. Retain instructions - The safety and operating instructions should be retained for future reference. Heed warnings - All warnings on the appliance and in the operating instructions should be adhered to. Follow instructions - All operating and use instructions should be followed. Water and Moisture - The appliance should not be used near water - for example, near a bathtub, washbowl, kitchen sink, laundry tub, in a wet basement, or near a swimming pool, and the like. Carts and Stands - The appliance should be used only with a cart or stand that is recommended by the manufac- turer. An appliance and cart combination should be moved with care. Quick stops, excessive force, and uneven surfaces may cause the appliance and cart combination to over- turn. Wall or Ceiling Mounting - The appliance should be mounted to a wall or ceiling only as recommended by the manufacturer. Ventilation - The appliance should be situated so that its location or position does not interfere with its proper ven- tilation. For example, the appliance should not be situ- ated on a bed, sofa, rug, or similar surface that may block the ventilation openings; or, placed in a built-in installa- tion, such as a bookcase or cabinet that may impede the flow of air through the ventilation openings. Heat - The appliance should be situated away from heat sources such as radiators, heat registers, stoves, or other appliances (including amplifiers) that produce heat. Power Sources - The appliance should be connected to a power supply only of the type described in the operating instructions or as marked on the appliance. Grounding or Polarization - The precautions that should be taken so that the grounding or polarization means of an appliance is not defeated. Power Cord Protection - Power supply cords should be routed so that they are not likely to be walked on or pinched by items placed upon or against them, paying particular attention to cords at plugs, convenience recep- tacles, and the point where they exit from the appliance. Cleaning - The appliance should be cleaned only as rec- ommended by the manufacturer. Nonuse Periods - The power cord of the appliance should be unplugged from the outlet when left unused for a long period of time. Object and Liquid Entry - Care should be taken so that objects do not fall and liquids are not spilled into the en- closure through openings. Damage requiring Service - The appliance should be ser- viced by qualified service personnel when: A. B. C. D. E. Servicing - The user should not attempt to service the ap- pliance beyond that described in the operating instruc- tions. All other servicing should be referred to qualified service personnel. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR BACK). NO USER-SERVICEABLE PARTS INSIDE. TO PREVENT ELECTRIC SHOCK, MATCH WIDE BLADE OF PLUG TO WIDE SOLT, FULLY INSERT. POUR VITER LES CHOCS LECTRIQUES, INTRODUIRE LA LAME LA PLUS LARGE DE LA FICHE DANS LA BORNE CORRE- SPONDANTE DE LA PRISE ET POUSSER JUSQU AU FOND. CAUTION: ATTENTION: The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and mainte- nance (servicing) instructions in the literature accompanying the appliance. The lightening flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to the presence of uninsulated “dangerous voltage” within the products en- closure that may be of sufficient magnitude to constitute a risk of electric shock to persons. “WARNING” “TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOIS- TURE.” 1. 2. 3. 4. 5. 6. 7. 8. The power supply cord or the plug has been damaged; or Objects have fallen, or liquid has been spilled into the appliance; or The appliance has been exposed to rain; or The appliance does not appear to operate normally or exhibits a marked changed in performance; or The appliance has been dropped, or the enclosure damaged. 9. 10. 11. 12. 13. 14. 15. 16. 17. RadioFans.CN 收音机爱 好者资料库 Parts marked with this sign are safety critical components. They must always be replaced with identical components. Refer to the Fostex Parts List and ensure exact replacement. CAUTION TABLE OF CONTENTS 1. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. CONTROLS, INDICATORS AND CONNECTORS . . . . . . . . . . . . 3. ADJUSTING PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . 4. EXPLODED VIEW, PCB ASSEMBLY AND PARTS LIST . . . . . . 5. CIRCUIT & BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . Owners manual: 8288418000 (for export & domestic model) AC adaptor AD-12A: 8270727003 (for USA/CND) : 8270727006 (for EUR) : 8270727007 (for UK) : 8270727010 (for JPN) Adjusting Procedures, Parts List and circuit diagrams are given in this manual to assist the service technician in maintaining the Model X-24. NOTES The following accessories are supplied with X-24 as the standard accessories.* * Following is the packing material for the Model X-24. * Carton, inner, X-24: 8228715000 Packing, L, X-24: 8228439001 Packing, R, X-24: 8228439002 3 X-24 4 7 8 14 23 ! ! RadioFans.CN 收音机爱 好者资料库 4 X-24 1. SPECIFICATIONS DEFINITION Specification Unit0 dBV = 1 Vrms Normal Fader Position Input faderAt 8 1 position ConditionLINE IN / INSERT: -10 dBV / 1 kHz Recorder: Input Monitor mode (REC - PAUSE) Adjust input fader for -10 dBV at TAPE OUT. PAN: L (R) Master faderAt 8 1 position ConditionLINE IN / INSERT: -10 dBV / 1 kHz Recorder: Input Monitor mode (STOP) Adjust master fader for -10 dBV at LINE OUT. PAN: L (R) MIXER SECTION Standard Input MIC IN ConnectorPhone (unbalanced) / XLR (balanced) Input level-50 -10 dBV Impedance10 k or more LINE IN / INSERT (RCV) ConnectorStereo phone (tip) Input level-10 dBV Impedance10 k or more Standard Output TAPE OUT 1 4 ConnectorRCA pin Output level-10 dBV Load impedance10 k or more LINE OUT L, R ConnectorRCA pin Output level-10 dBV Load impedance10 k or more INSERT (SEND) ConnectorStereo phone (ring) Output level-10 dBV Load impedance10 k or more Phones Max. Output Level20 mW or more (1 kHz, 16 load) Level Indication0 dB is indicated by 5-dot LED bargraph meter when input / output level is -10 dBV with the above standard input / master fader position settings. Frequency Response MIC IN (Input Level: -50 dBV)40 20 kHz 3 dB at LINE OUT MIC IN (Input Level: -10 dBV)20 20 kHz 3 dB at LINE OUT LINE IN (Input Level: -10 dBV)50 10 kHz 2 dB at PHONES (10 mW / 16 ) S / N (shorted by 150 resistor) MIC IN (MIC GAIN: MIC)66 dB or more at LINE OUT (DIN AUDIO) 68 dB or more at LINE OUT (IHF A) MIC IN (MIC GAIN: LINE)73 dB or more at LINE OUT (DIN AUDIO) 75 dB or more at LINE OUT (IHF A) RadioFans.CN 收音机爱 好者资料库 X-24 5 MIXER SECTION (continued) Distortion (With 400 Hz HPF & 30 kHz LPF)0.05 % or less (Input: 1 kHz / 0 dBV signal, MIC GAIN: LINE, LINE OUT: 0 dBV.) 0.2 % or less (Input: 1 kHz / 0 dBV signal, MIC GAIN:LINE, PHONES: 3 mW / 16.) Fader Attenuation70 dB or more at 1 kHz (from standard fader position) Crosstalk60 dB or more at 1 kHz (Input: MIC IN, MIC GAIN: LINE, OUT: SEND OUT. Measure level at non-input channel.) PAN Crosstalk42 dB or more at 1 kHz (Input: MIC IN, MIC GAIN: LINE, OUT: LINE OUT. Measure level at non-input channel.) Click Noise Power on / off-20 dBVp-p or less Other switching-30 dBVp-p or less Shock Noise-30 dBVp-p or less (Measure noise level when one side of appliance is dropped 3 times from 5 cm height.) RECORDER SECTION Tape Speed9.5 cm/s 1.5 % (3000 Hz 45 Hz when reproducing TCW-211 test tape.) Wow & Flutter PLAY0.25 % or less (TCW-211 test tape, ANSI WTD.) REC & PLAY0.30 % or less (AC-514 test tape, ANSI WTD.) Pitch Control MIN (PITCH VR: Fully CCW)-45 % or less (TCW-211 test tape) MAX (PITCH VR: Fully CW)+12 % or more (TCW-211 test tape) Fast Winding Time (FF / RWD)150 20 sec. (TAPE: C-60) Tape Counter Deviation0 7 (FF from BOT to EOT and then RWD to BOT again.) Standard Level PLAY-10 1 dB (TCW-231 test tape) REC & PLAY-10 1 dBV (AC-514 test tape, 1 dB or less of level difference between channels is also required.) Frequency response PLAYTest tape: SCW-977 / TCW-284F (NR: OUT) REC & PLAYTest tape: AC-514 (NR: OUT, recording level: 0 dB) Test tape: AC-514 (NR: IN, recording level: -25dB) +3 dB -3 dB 400 Hz12.5 kHz40 Hz +3 dB -3 dB 400 Hz12.5 kHz40 Hz 12.5 kHz 250 Hz 5 dB 10 kHz 6 dB RadioFans.CN 收音机爱 好者资料库 6 X-24 Specifications and appearance are subject to change without notice for product improvement. RECORDER SECTION (continued) Level Deviation at Reference Output Level PLAY1 dB or less at 400 Hz (NR: OUT, TCW-231 test tape) 3 dB or less at 40 HZ 12.5 kHz (NR: OUT, SCW-977 / TCW-284F test tape) REC & PLAY1 dB or less at 400 Hz (NR: OUT, AC-514 test tape) 2 dB or less at 100 Hz 10 kHz (NR: OUT, AC-514 test tape) S/N PLAY47 dB or more (NR: OUT, DIN AUDIO) 55 dB or more (NR: OUT, IHF-A) REC & PLAY45 dB or more (NR: OUT, DIN AUDIO) 48 dB or more (NR: OUT, IHF-A) 48 dB or more (NR: IN, DIN AUDIO) 55 dB or more (NR: IN, IHF-A) Distortion (REC & PLAY)2 % or less (Input signal: 1 kHz / standard level, standard fader position, with 400 Hz HPF & 30 kHz LPF) Erasure Ratio67 dB or more at 1 kHz (Input signal: 1 kHz / 0 dBV, standardfader position, with 1 kHz BPF) Cross Erasure1 dB or less (Input signal: 10 kHz / -10 dBV, standard fader position. Measure level difference when adjacent track is put into REC mode.) Channel Separation50 dB or more (Input signal: 1 kHz / -10 dBV, standard fader position, with 1 kHz BPF. Measure leakage level when adjacent track is put into REC mode.) Sync Crosstalk-25 dBV or less (Input signal: 1 kHz / -10 dBV) -10 dBV or less (Input signal: peak frequency / -10 dBV) (Measure leakage level when adjacent track is put into REC mode.) Bias Leakage-35 dBV or less (No LED meter is lit. Standard fader position. Measure leakage level at TAPE OUT when unit is put into REC mode.) Click Noise PLAY STOP-30 dBVp-p or less REC STOP Monitor-20 dBVp-p or less PLAY-20 dBVp-p or less Punch In / Out-30 dBVp-p or less at PLAY Shock Noise-30 dBVp-p or less (Measure playback noise level when one side of appliance is dropped 3 times from 5 cm height.) RadioFans.CN 收音机爱 好者资料库 X-24 7 2. CONTROLS, INDICATORS & CONNECTORS 1 2 3 4 POWERREC 6+305-10 6+305-10 6+305-10 6+305-10REC SEL REC SEL REC SEL REC SEL PANINPUT/PLAYBACK LEVEL Auto Bounce 000 RECREWFFSTOPPAUSEPLAY LR 4 DC IN 12V ONSTANDBYOFF ON DOLBY NR RESET L 3 L 2 L 1 R R R MASTER MIC IN 2/4 1/3 RL4321 LINE OUTLINE IN/INSERT -+ WIDE PITCH DOLBY B NR REHEARSAL 1. Master fader MASTER 2. Input/playback level control faders INPUT/PLAYBACK LEVEL 3. Pan pot knob PAN 4. Record track select switches REC SEL 5. Record track LED 6. Level meter 7. Pitch control knob WIDE PITCH 8. Tape counter/reset button RESET 9. Cassette lid/Cassette tray 10.Transport control buttons Play button PLAY Stop button STOP Fast forward button FF Rewind button REW Recording button REC Pause button PAUSE 11. Power LED POWER 12. Record LED REC 13. Auto bounce on/off button Auto Bounce 14. Auto bounce LED 15. Trim knob RadioFans.CN 收音机爱 好者资料库 8 X-24 1. Mic input jacks MIC IN 1/3, 2/4 2. Headphone jack PHONES 3. Punch in/out jack PUNCH IN/OUT PUNCH IN/OUTPHONES 2 (HOT) 3 (COLD) 1 (GND) 1234 TAPE OUT 1. Line out jacks LINE OUT L, R 2. Line in/insert jacks LINE/INSERT 1, 2, 3, 4 3. Tape out jacks TAPE OUT 1, 2, 3, 4 4. Dolby B noise reduction on/off switch DOLBY NR ON/OFF 5. Power switch ON-STANDBY 6. DC IN connector DC IN 12V 3. ADJUSTING PROCEDURES With constant use, the head surface becomes soiled with magnetic particles from the tape, dirt and dust. Under such conditions, the tape will not always be in smooth contact with the head and thus result in poor performance. Less 3-1. Routine Maintenance 3-1-1. Cleaning 1) Head RadioFans.CN 收音机爱 好者资料库 X-24 9 2) Capstan and pinch roller Buildup of magnetic particles and dust on these parts will cause increase in wow, flutter and wrapping of tape on the capstan. Thus, these parts must always be kept clean. Cleaning is done with cotton buds moistened with fluids prescribed or recommended for tape recorders and especially the heads. Never use lacquer thinner, acetone or other organic solvents. 3-1-2. Demagnetizing The REC/PLAY head becomes magnetized by extended use or when the head is touched with a magnetized object. As a result, frequency response especially in the high region will deteriorate, noise level increases, and in some cases may transfer noise to valuable prerecorded tapes. For this reason, do not touch the head with magnetized screwdriver and scissors or allow DC current to flow through the head winding such as when testing continuity with a circuit tester. Should the head becomes magnetized, demagnetize it with a head demagnetizer designed for this purpose. Demagnetizing Procedures After turning off the power of Model X-24, open the cassette lid and if a cassette tape is loaded, remove and place it far away from the deck. Switch on the head demagnetizer while holding it about one meter away from the Model X-24. Then, slowly move the head demagnetizer tip to the head and wave the tip up and down several times close to the head surface. On completing the above procedures, slowly draw the demagnetizer away from the head and switch it off when it is more than one meter away from the head. As demagnetizm in the head cannot be seen, unlike the soiled head, routine demagnetizing is necessary. It is recommended to do so at the same time the head is cleaned. 1) 2) 3) 3-2. Test Equipment and Adjusting Tools The following tools and equipment are required for adjusting the Model X-24. Head height and tape contact adjusting jigModel 9001 (P/N: 8286001000) Torque meter Cassette torque meterTW-2231 (P/N: 8286008000): 0 200 g-cm (0 2.8 Oz-In) Cassette torque meterTW-2111A (P/N: 8286009000): 0 100 g-cm (0 1.4 Oz-In) Mirror tape cassetteTCC-902 (P/N: 8286002000) Test tape Speed / Flutter (3 kHz)Model 9152 (P/N: 82660022000) Also 3150 Hz test tape for Wow & Flutter measurement is recommended. Reference playback levelTCW-231 (P/N: 8266002000) Playback frequency responseTCW-284F (P/N: 8266003000) Blank tapeC-90 or shorter tape, TYPE II / HIGH position Audio oscillatorGeneral type Frequency counterGeneral type Bandpass filterGeneral type AC voltmeterStereo type is recommended. OscilloscopeGeneral type Wow & Flutter meterGeneral type Distortion meterGeneral type Frequency counterGeneral type 1) 2) 3) 4) 5) 6) 7) 8) 9) 10) 11) 12) 13) output in the high region and dropout (some parts of sound not reproduced) are typical symptoms. It is therefore recommended to clean the heads pe