Fostex-VM88-mix-sm 电路图 维修手册.pdf

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1、Service Manual Model 8CH Digital Mixer with DSP Effects FOSTEX CORPORATION 3-2-35 Musashino, Akishima, Tokyo, Japan 196-0021 FOSTEX CORPORATION OF AMERICA 15431 Blackburn Ave., Norwalk, CA 90650, U.S.A. PRINTED IN JAPAN MAR. 2000 8288789000 RadioFans.CN 收音机爱 好者资料库 SAFETY INSTRUCTIONS Read instructio

2、ns - 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.

3、 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 applianc

4、e 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 sh

5、ould 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

6、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 applian

7、ces (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 polariza

8、tion 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

9、 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 d

10、o 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 in

11、struc- 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 E

12、LECTRIC SHOCK, MATCH WIDE BLADE OF PLUG TO WIDE SLOT, 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

13、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 voltag

14、e” 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 d

15、amaged; 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.

16、14. 15. 16. 17. 43 VM88 VM88 BLOCK DIAGRAM CH 1 A/D LOHI PRE/POST GAIN PAN EFF 1 10kHz100Hz To DIGI OUT ASP DIGITAL EFFECT EFF 1-2 ST MASTER D/A D/A To METER ST MASTER PHONES (100mW) ST OUT (-10dBV) L R L R EFF TRIM EFF 2 AUX 1 AUX 2 CH ON 1kHz MID CH5/6 A/D LOHI PRE/POST GAIN PAN EFF 1 10kHz100Hz T

17、o METER EFF 2 AUX 1 AUX 2 CH ON 1kHz MID A/D AUX MASTER D/A D/A AUX 1 OUT (-10dBV) ST 1 2 AUX 1 2 AUX 1 MASTER AUX 2 MASTER EFF 1 MASTER EFF MUTE LOHI 10kHz100Hz CH ON 1kHz MID MONO/STEREO (SETUP) CH7/8 CH 2 CH 3 CH 4 AUX 2 OUT (-10dBV) To MON To MON DIGI OUT MON DIGI IN To METER From DIGI IN INSERT

18、 (-10dBV) TRIM TRIM MON SEL AUX 2 AUX 1 ST From AUX 1 From AUX 2 From ST SUB IN (-10dBV) MON OUT (-10dBV) L (M) L (M) R R From ST From CH1-A/D From CH2-A/D From CH3-A/D From CH4-A/D From CH5-A/D From CH6-A/D From CH7-A/D From CH8-A/D S/P DIF ENCODE ADAT ENCODE S/P DIF ADAT (SETUP) DIGI OUT To DIGI O

19、UT DIGI IN (SETUP) From DIGI IN CH5 INPUT (+4dBu-40dBu) CH6 INPUT (+4dBu-40dBu) LINE (+10dBu-30dBu) MIC (-10dBu-50dBu) PHANTOM (SETUP) -48V DIGI IN S/P DIF or ADAT DECODE (SETUP) To CH1 To CH2 To CH3 To CH4 To CH5 To CH6 To CH7 To CH8 ST OUT (+4dBu) L R ST OUT To MON To DIGI OUT RadioFans.CN 收音机爱 好者

20、资料库 VM88VM88 423 PLL, DIGITAL, MAIN, VM88 U925TC9246F L7 22uH C27 220/10 C13 0.01 C14 0.01 PGND D+5 P GND R978 100 C34 0.47 C15 0.01 R9701K R96822K R9764.7K C35 15P C16 0.01 R974 330 R975 750 1 2 3 U917A 74VHC86 4 5 6 U917B 74VHC86 D+5 R979 100 314 413 512 611 157 10 2 9 1 U919 A 74VHC161 D+5 1 2 3

21、U920 A 74VHC00 4 5 6 U920 B 74VHC00 9 10 8 U920 C 74VHC00 S 4 D 2 CK 3 R 1 Q 5 Q 6 U923 A 74VHC74 S 10 D 12 CK 11 R 13 Q 9 Q 8 U923 B 74VHC74 S 10 D 12 CK 11 R 13 Q 9 Q 8 U924 B 74VHC74 S 4 D 2 CK 3 R 1 Q 5 Q 6 U924 A 74VHC74 S 4 D 2 CK 3 R 1 Q 5 Q 6 U922 A 74VHC74 S 10 D 12 CK 11 R 13 Q 9 Q 8 U922

22、B 74VHC74 C31 100 P D+5 DGND DGND D+5 D+5 23 1 U928 DTA114EK 2 1 3 U929 DTC114EK R984 10K R985 10K D+5 DGNDD+5 D+5 R980 100 D+5 R981 2.2K C32 100 P DGND R982 100 14 7 D+5 DGND 14 7 14 7 14 7 14 7 16 8 C17 0.01 C18 0.01 C19 0.01 C20 0.01 C21 0.01 C22 0.01 S 4 D 2 CK 3 R 1 Q 5 Q 6 U921 A 74VHC74 D+5 D

23、+5 C33 100 P DGND DGND 14 7 C23 0.01 LOCK2 R971 1K R983 10k D908 1SS 355 R973 100 R972 100 12 13 11 U920 D 74VHC00 D+5 S 10 D 12 CK 11 R 13 Q 9 Q 8 U921B 74HC74 L3 EMI D+5 D+5 L4 EMI X902 C28 22P C29 22P DGNDDGND R9861M 34 U927B 12 U927A L5 L6 DGND 16 8 R969NON C24 0.01 C25 0.01 14 7 569811101312 L9

24、8 820uH C36 0.1 DGND D+5 DGND MCK MCKDIF FS512 FS512 MCK LRCK LRCK DATA_IN DATA_IN U927C 74HC04 U927D 74HC04 U927E 74HC04 U927F 74HC04 FCONT2 /PLL1_CONT /PLL2_CONT PD1 PD2 FCONT1 FCONT2 /PLL1_CONT /PLL2_CONT PD1 PD2 FCONT1 REF PD VDDA AMPI AMPO VSSA XI XO VDD LOCK S2 S1 M2 M1 CKO VSS 1 2 3 4 5 6 7 8

25、 16 15 14 13 12 11 10 9 22.5792MHz 74VHCU04 74VHCU04 EMI EXT/INT EXT/INT 1A 1B 2A 2B 3A 3B 4A 4B A/B G 1Y 2Y 3Y 4Y 2 3 5 6 11 10 14 13 1 15 4 7 9 12 U926A 74VHC157 EMI U917E VCC GND 74VHC86 U919B VCC GND 74VHC161 U920E VCC GND 74VHC00 U921C VCC GND 74VHC74 U922C VCC GND 74VHC74 U923C VCC GND 74VHC74

26、 U924C VCC GND 74VHC74 U926B VCC GND 74VHC157 U927G VCC GND 74VHCU04 2. MAIN_D, CPU1. MAIN_D, ROOT 3. MAIN_D, DSP_ROOT 7. MAIN_D, GA_DIF 4. MAIN_D, DSP1 2 5. MAIN_D, DSP3 6. MAIN_D, DSP SEL 8. MAIN_D, PLL SPDIF/ADAT LOCK2 SPDIF/ADAT A B C D ENP ENT CK LOAD CLR QA QB QC QD RCO Parts marked with this

27、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 Owners manual: 8288458000 (for export & domestic model) Service mode, exploded view, PCB assembly, parts list and circui

28、t diagrams are given in this manual to assist the service technician in maintaining the Model VM88. NOTES The following accessories are supplied with VM88 as the standard accessories.* * Following is the packing material for the Model VM88.* Carton, inner, VM88: 8228737000 Packing, side, L, VM88: 82

29、28465001 Packing, side, R, VM88: 8228465002 1. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. CONTROLS, INDICATORS AND CONNECTORS . . . . . . . . . . . . 3. SERVICE MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4. EXPL

30、ODED VIEW, PCB ASSEMBLY AND PARTS LIST . . . . . . 5. CIRCUIT AND BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . 4 6 7 10 23 ! RadioFans.CN 收音机爱 好者资料库 VM88VM88 441 1. SPECIFICATIONS Specification Unit0 dBV = 1 Vr.m.s., 0 dBu = 0.775 Vr.m.s. Standard Input INPUT 1 4 ConnectorXLR Cannon (M

31、IC) 6 mm TRS phone jack (LINE) Input level-50 dBu -10 dBu (MIC) -30 dBu +10 dBu (LINE) Input impedance3 k or more (MIC) 10 k or more (LINE) INPUT 5 - 8 Connector 6 mm TRS phone jack Input level-40 dBu +4 dBu Input impedance10 k or more INSERT 1 - 4 Connector 6 mm TRS phone jack Input level-10 dBV In

32、put impedance10 k or more MON IN L, R Connector 6 mm TRS phone jack Input level-10 dBV Input impedance10 k or more DATA IN ConnectorSquare shape optical Format S/P DIF INIEC consumer optical standard (IEC 958 Part 3) ADAT INAlesis Proprietary Multichannel Optical Digital Interface Standard Output ST

33、EREO OUT L, R ConnectorXLR Cannon 6 mm TRS phone jack Output level+4 dBu (XLR Cannon) -10 dBV ( 6 mm TRS phone jack) Load impedance10 k or more (XLR Cannon & 6 mm TRS phone jack) AUX SEND 1, 2 Connector 6 mm TRS phone jack Output level-10 dBV Load impedance10 k or more MON OUT L, R Connector 6 mm TR

34、S phone jack Output level-10 dBV Load impedance10 k or more PHONES OUT L, R Connector 6 mm TRS phone jack Output level50 mW or more Load impedance32 DATA OUT ConnectorSquare shape optical Format S/P DIF OUTIEC consumer optical standard (IEC 958 Part 3) ADAT OUTAlesis Proprietary Multichannel Optical

35、 Digital Interface EQ HI10 kHz 18 dB (shelving type) MID1 kHz 18 dB (peaking type) LO100 Hz 18 dB (shelving type) Fader (VR) Position at Standard Input / Output Input Fader80 position INPUT 1 4 (TRS)+10 dBu, 1 kHz DIGITAL I/F, DIGITAL, MAIN, VM88 C6 0.01 C7 0.01 C8 0.01 DGND D+5 C30 100P C9 0.01 C10

36、 0.01 C26 10/16 / / R964 100 R965 100 2 4 6 87 5 3 1R967 DGND C11 0.01 C12 0.01 U918 GA_DIF R966 100 56 U903C 12 13 11 U913D 9 10 8 U914C R40 47 C44 100P DGND R41 100 TDO_FS0O TDO_EMPO PI PO TEST1 TEST2 VDD A4 A3 A2 A1 A0 WR RD VSS CS RESET D0 D1 D2 D3 D4 D5 D6 D7 CTL_PIN VDD VSS EN_IF SINA_MD 1 2 3

37、 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 PD2 MCK2 VSS PLL1_CONT LOCK1 FCONT1 PD1 MCK1 DO_SEL0 DO_SEL1 ADAT_MD DO2 DO1 DO_EMPI VSS VDD DO_FS0I DO_FS1I SOUT_DI SOUT2_78 SOUT2_56 SOUT2_34 SOUT2_12 VSS SOUT1_78 SOUT1_56 SOUT1_34 SOUT1_12 DI_EMPO DI_FS0O 80 79 78 77 76

38、75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 TDO_FS1O W_OUT W_IN2 W_IN1 FS256O BCKO LRCKO LRCKI BCKI VDD VSS FS256I PCMBW0 PCMBW1 CK_SEL0 CK_SEL1 CK_SEL2 PLL2_CONT LOCK2 FCONT2 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 SOUT1_MD SOUT2_MD TDI_FS1I TDI_F

39、S0I TDI_EMPI SINA_12 SINA_34 SINA_56 SINA_78 VSS VDD SINB_12 SINB_34 SINB_56 SINB_78 SIN_DIF DI1 DI2 DI_SEL DI_FS1O 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 ADO1 ADO2 ADO3 ADO4 ADOA ADO2 ADO3 ADO4 A4 A3 A2 A1 A0 D0 D1 D2 D3 D4 D5 D6 D7 SPDIF/ADAT /PLL2_CONT LOCK2 FCONT2 PLL LRCK L

40、RCK DATA_IN SPDIF/ADAT DATA_IN SPDIF/ADAT /PLL2_CONT LOCK2 FCONT2 pll.sch PD1 FCONT1 MCK /PLL1_CONT PD2 PD1 FCONT1 MCK /PLL1_CONT PD2 EXT/INT FS512 EXT/INT FS512 EXT/INT FS512 DATA_OUT SPDIFOUT DATA_OUT SPDIFOUT SOUT_78 SOUT_56 SOUT_34 SOUT_12 SOUT_78 SOUT_56 SOUT_34 SOUT_12 100 X 4 DATA_IN DATA_IN

41、STOUT ADO1.4 STOUT ADO1.4 /RST_DIF /CS_DIF /RD_DIF /WR_DIF CPUD0.7 CPU CPU CPU CPU /RST_DIF /CS_DIF /RD_DIF /WR_DIF D0.7 A0.4CPU A0.4 /LRCK /LRCK BCK BCK FS256 FS256 LRCK 74VHC0074VHC00 74VHC14 2. MAIN_D, CPU1. MAIN_D, ROOT 3. MAIN_D, DSP_ROOT 7. MAIN_D, GA_DIF 4. MAIN_D, DSP1 2 5. MAIN_D, DSP3 6. M

42、AIN_D, DSP SEL 8. MAIN_D, PLL VM88VM88 405 DSP SELECT, DIGITAL, MAIN, VM88 1 2 3 4 5 6 9 10 8 12 13 11 14 7 9 10 8 14 7 1 2 3 12 13 11 1 2 3 4 5 6S O 14 7 1 2 13 12 1 2 3 4 5 6 9 10 8 3 4 5 6 12 13 11 4 5 6 9 10 8 12 13 11 14 7 C1 0.01 C2 0.01 C3 0.01 C4 0.01 C5 0.01 14 7 D+5 D+5 DGND R961 100 D+5 R

43、962100 R963100 9 10 11 8 D+5 SO_DSP SO_DSPCPU (SBIO P19) SCK_DSP SCK_DSP CPU (SBIO P18) SI_DSP SELECTOR SI_DSP SI_DSP 74VHC00 U912D 74VHC00 U912C 74VHC00 U912B 74VHC00 U912A 74VHC00 U913A 74VHC00 U913B 74VHC00 U913C 74VHC10 U916A 74VHC00 U915A 74VHC00 U915D 74VHC00 U915C 74VHC00 U914B 74VHC00 U914A

44、74VHC00 U914D 74VHC10 U916C 74VHC10 U916B 74VHC00 U915B 74VHC86 U917C 74VHC86 U917D DRDY_DSP DRDY_DSP WRDY_DSP WRDY_DSP DRDY_DSP1 DRDY_DSP2 DRDY_DSP3 WRDY_DSP1 WRDY_DSP2 WRDY_DSP3 WRDY_DSP1.3 DRDY_DSP1.3 U915E 74VHC00 VCC GND U914E 74VHC00 VCC GND U913E 74VHC00 VCC GND U912E 74VHC00 VCC GND U916D 74

45、VHC00 VCC GND SCK_DSP1 SCK_DSP2 SCK_DSP3 SCK_DSP1.3 SO_DSP1.3 SCK_DSP1.3 SO_DSP1.3 SO_DSP2 SO_DSP3 SO_DSP1 SEL1 SEL2 SEL3 SEL1.3 WRQ_DSP RST_DSP SEL1.3 WRQ_DSP RST_DSP SEL1 SEL2 SEL3 /WRQ_DSP1 /WRQ_DSP2 /WRQ_DSP3 /WRQ_DSP1.3 /WRQ_DSP1.3 /RST_DSP1.3 /RST_DSP1.3 /RST_DSP1 /RST_DSP2 /RST_DSP3 DRDY WRDY

46、 /RST_DSP /WRQ_DSP SEL1 SEL2 SEL3 2. MAIN_D, CPU1. MAIN_D, ROOT 3. MAIN_D, DSP_ROOT 7. MAIN_D, GA_DIF 4. MAIN_D, DSP1 2 5. MAIN_D, DSP3 6. MAIN_D, DSP SEL 8. MAIN_D, PLL DRDY_DSP1.3 WRDY_DSP1.3 Fader (VR) Position at Standard Input / Output (continued) INPUT 5 8 (TRS)+4 dBu, 1 kHz PANL (R) Master Fa

47、derAdjust so that ST OUT level is at -10 dBV. ( ST OUT SW: ON) INPUT 1 4 (TRS)+10 dBu, 1 kHz INPUT 5 8 (TRS)+4 dBu, 1 kHz PANL (R) MON OUT VRAdjust so that MON OUT level is at -10 dBV. (ST OUT SW: ON, MON SEL SW: ST) INPUT 1 4 (TRS)+10 dBu, 1 kHz INPUT 5 8 (TRS)+4 dBu, 1 kHz PANL (R) MON IN VRAdjust

48、 so that MON OUT level is at -10 dBV. (ST OUT: ON, MON SEL: ST) INPUT 1 4 (TRS)+10 dBu, 1 kHz INPUT 5 8 (TRS)+4 dBu, 1 kHz PANL (R) Output Level INPUT 1 8 STEREO OUT-10 dBV 2 dB INPUT 1 8 MONITOR OUT-10 dBV 2 dB Frequency Response INPUT 1 8 STEREO OUT / MONITOR OUT / AUX SEND INPUT 1 420 Hz 20 kHz +

49、1, -3 dB (LINE level) INPUT 1 420 Hz 20 kHz +1, -3 dB (MIC level) INPUT 5 820 Hz 20 kHz +1, -3 dB (LINE level) INPUT 1 8 PHONES OUT INPUT 1 430 Hz 20 kHz +1, -3 dB (LINE level) INPUT 1 430 Hz 20 kHz +1, -3 dB (MIC level) INPUT 5 830 Hz 20 kHz +1, -3 dB (LINE level) T.H.D. (w/ distortion filter NF3346A, 3347 or equivalent) INPUT 1 8 STEREO OUT / MONITOR OUT / AUX SEND INPUT 1 4 (0 dBu, XLR)0.03 % or less INPUT 1 4 (-40 dBu, XLR)0.05 % or less INPUT 1 4 (+20 dBu, TRS)0