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 VM88 ST OUT (-10dBV) ST OUT (+4dBu) L (M) L (M) CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN TO PREVENT ELECTRIC SHOCK, MATCH WIDE BLADE OF PLUG TO WIDE SLOT, ST OUT To MON FULLY INSERT. To MON AUX 1 OUT (-10dBV) D/A REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. SPONDANTE DE LA PRISE ET POUSSER ST MASTER DIGI OUT LA FICHE DANS LA BORNE CORRE- JUSQU' AU FOND. D/A AUX MASTER ST MASTER MON From AUX 1 From AUX 2 "WARNING" "TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE." EFF AUX 12 12 SAFETY INSTRUCTIONS 2. 3. 4. 5. PAN PAN 1. HI To METER 10kHz MID LO LO 14. 100Hz 100Hz MID 1kHz 1kHz 13. To METER 10kHz HI 6. EFF 1-2 To DIGI OUT MONO/STEREO (SETUP) To DIGI OUT 15. PHANTOM (SETUP) A/D A/D -48V 7. LINE (+10dBu~-30dBu) MIC (-10dBu~-50dBu) CH5 INPUT (+4dBu~-40dBu) CH6 INPUT (+4dBu~-40dBu) CH5/6 CH7/8 DIGI IN 17. CH 1 CH 2 CH 3 CH 4 DIGI IN S/P DIF or ADAT TRIM TRIM 8. 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 overturn. 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 ventilation. For example, the appliance should not be situated on a bed, sofa, rug, or similar surface that may block the ventilation openings; or, placed in a built-in installation, such as a bookcase or cabinet that may impede the flow of air through the ventilation openings. VM88 BLOCK DIAGRAM 16. INSERT (-10dBV) From DIGI IN A/D DIGI IN (SETUP) From DIGI IN TRIM DECODE (SETUP) To CH1 To CH2 To CH3 To CH4 To CH5 To CH6 To CH7 To CH8 EFF 1 MASTER ASP DIGITAL EFFECT Read instructions - All the safety and operating instructions 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 manufacturer. 9. 12. GAIN CH ON CH ON GAIN 11. EFF MUTE 10. 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 receptacles, and the point where they exit from the appliance. Cleaning - The appliance should be cleaned only as recommended 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 enclosure through openings. Damage requiring Service - The appliance should be serviced by qualified service personnel when: A. The power supply cord or the plug has been damaged; or B. Objects have fallen, or liquid has been spilled into the appliance; or C. The appliance has been exposed to rain; or D. The appliance does not appear to operate normally or exhibits a marked changed in performance; or E. The appliance has been dropped, or the enclosure damaged. Servicing - The user should not attempt to service the appliance beyond that described in the operating instructions. All other servicing should be referred to qualified service personnel. ST LR From ST LO AUX 1 PRE/POST AUX 2 PRE/POST AUX 2 AUX 1 EFF 2 EFF 1 EFF 1 EFF 2 From CH6-A/D From CH7-A/D From CH8-A/D From CH2-A/D From CH3-A/D From CH4-A/D From CH5-A/D From CH1-A/D AUX 1 MASTER 100Hz From ST 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 product's enclosure that may be of sufficient magnitude to constitute a risk of electric shock to persons. AUX 2 MASTER The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying the appliance. CH ON D/A MID 1kHz MON SEL 10kHz AUX 1 AUX 2 ST S/P DIF ENCODE ADAT ENCODE HI S/P DIF ADAT (SETUP) DIGI OUT NO USER-SERVICEABLE PARTS INSIDE. D/A INTRODUIRE LA LAME LA PLUS LARGE DE To METER DO NOT REMOVE COVER (OR BACK). POUR ÉVITER LES CHOCS ÉLECTRIQUES, To DIGI OUT CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, ATTENTION: To MON AUX 2 OUT (-10dBV) MON OUT (-10dBV) SUB IN (-10dBV) PHONES (100mW) R R CAUTION: R L L R 43 10 S S MCK 8 3 2 11 R U920 C 10 1 U923 B Q Q 74VHC74 1 R 4 U917B 5 6 3 10 DATA_IN 4 100 74VHC161 U924 B Q Q 74VHC74 8 9 2 3 4 DATA_IN 2 74VHC86 12 D CK R 4 S U917A 1 R979 D+5 DGND 7 10 2 9 1 74VHC00 13 U921 A D+5 Q Q U922 B R982 100 Q Q 74VHC74 R981 2.2K LOCK2 LOCK2 10k R983 D+5 12 13 74VHC00 SPDIF//ADAT D908 1SS 355 U920 D 11 8 9 4 10 11 S S D CK R 1 CK R 1 Q 3 D+5 D CK R S 6 U922 A Q Q 74VHC74 13 D+5 12 R980 11 100 S DGND 13 74VHC74 DGND 74VHC74 2 D CK 1 R 5 6 LRCK D+5 LRCK 3 D+5 C32 100 P SPDIF//ADAT U927C 6 5 74HC04 FCONT1 FCONT2 DGND D+5 L 98 /PLL1_CONT 820uH /PLL2_CONT PD1 PD2 750 1. MAIN_D, ROOT 2. MAIN_D, CPU U927D 8 9 74HC04 FCONT2 R969 NON C13 0.01 C27 220/10 P GND L7 22uH 74HC04 74HC04 FCONT1 R968 22K U927E 10 11 U927F 12 13 DGND /PLL1_CONT R970 1K 1K /PLL2_CONT R971 PD2 R972 R973 R974 330 C35 15P C16 0.01 C36 0.1 100 R975 R976 4.7K PD1 100 C14 0.01 D+5 10 U921B S 12 L3 11 C15 0.01 C34 0.47 EMI U925 R986 PGND X902 TC9246F 1M D+5 D R978 100 CK R 13 Q Q 9 8 74HC74 L4 EMI 3. MAIN_D, DSP_ROOT 1 2 3 4 5 6 7 8 REF PD VDDA AMPI AMPO VSSA XI XO VDD LOCK S2 S1 M2 M1 CKO VSS 16 15 14 13 12 11 10 9 MCK 1 42 VM88 PLL, DIGITAL, MAIN, VM88 D+5 6 D+5 U923 A Q Q 74VHC74 6 5 2 3 U928 DTA114EK U920 A 1 9 74VHC00 DGND CK 8 CK 3 D 9 D DGND 2 U920 74VHC00 B 12 4 D+5 R984 10K C33 100 P 5 D+5 D+5 ENP RCO ENT CK LOAD CLR 15 C31 100 P U919 A 3 4A B 5 6C D 14 QA 13 QB 12 QC 11 QD D+5 74VHC86 U924 A D Q 5 6 2 U929 DTC114EK R985 3 10K 2 5 MCK [DIF] 7. MAIN_D, GA_DIF 4. MAIN_D, DSP1 2 5. MAIN_D, DSP3 6. MAIN_D, DSP SEL 8. MAIN_D, PLL D+5 DGND 22.5792MHz 1 U926A U927A 2 C28 22P 1Y EMI 4 C29 22P 2Y 7 U927B 74VHCU04 L5 3 4 L6 EMI U924C U926B U927G 74VHCU04 FS512 FS512 U917E U919B 16 VCC GND 74VHC161 74VHC00 74VHC74 74VHC74 C19 0.01 7 GND GND 7 C22 0.01 7 GND C21 0.01 VCC VCC VCC C18 0.01 8 VCC C20 0.01 7 GND 14 14 14 14 C23 0.01 U921C C17 VCC GND 74VHC86 0.01 7 14 U920E U922C U923C 14 7 VCC GND 16 C24 0.01 74VHC74 8 VCC GND 14 C25 0.01 74VHC157 7 VCC GND 74VHCU04 DGND DGND 3Y 4Y EXT//INT EXT//INT 1 15 DGND A/B G 74VHC157 9 12 2 3 5 6 11 10 14 13 1A 1B 2A 2B 3A 3B 4A 4B 74VHC74 DGND CAUTION Carton, inner, VM88 Packing, side, L, VM88 Packing, side, R, VM88 : 8228737000 : 8228465001 : 8228465002 * Following is the packing material for the Model VM88. ! to assist the service technician in maintaining the Model VM88. Owner's manual TABLE OF CONTENTS * The following accessories are supplied with VM88 as the standard accessories. NOTES * Service mode, exploded view, PCB assembly, parts list and circuit diagrams are given in this manual components. Refer to the Fostex Parts List and ensure exact replacement. 1. SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2. CONTROLS, INDICATORS AND CONNECTORS . . . . . . . . . . . . 6 3. SERVICE MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4. EXPLODED VIEW, PCB ASSEMBLY AND PARTS LIST . . . . . . 10 5. CIRCUIT AND BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . 23 : 8288458000 (for export & domestic model) Parts marked with this sign are safety critical components. They must always be replaced with identical VM88 3 VM88 VM88 EXT//INT DATA_OUT FS512 SPDIFOUT 3. MAIN_D, DSP_ROOT Input level Input impedance INPUT 5 - 8 Connector Input level Input impedance INSERT 1 - 4 Connector Input level Input impedance MON IN L, R Connector Input level Input impedance DATA IN Connector Format S/P DIF IN ADAT IN Standard Output STEREO OUT L, R Connector Output level SPDIF//ADAT /PLL1_CONT /PLL2_CONT LOCK2 FCONT2 R964 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 GA_DIF Ø 6 mm TRS phone jack -10 dBV 10 k or more Ø 6 mm TRS phone jack -10 dBV 10 k or more Square shape optical IEC consumer optical standard (IEC 958 Part 3) Alesis Proprietary Multichannel Optical Digital Interface U918 80 79 78 77 76 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 C6 0.01 Load impedance AUX SEND 1, 2 Connector Ø 6 mm TRS phone jack Output level -10 dBV Load impedance 10 k or more MON OUT L, R Connector Ø 6 mm TRS phone jack Output level -10 dBV Load impedance 10 k or more PHONES OUT L, R Connector Ø 6 mm TRS phone jack Output level 50 mW or more Load impedance 32 DATA OUT Connector Square shape optical Format S/P DIF OUT IEC consumer optical standard (IEC 958 Part 3) ADAT OUT Alesis Proprietary Multichannel Optical Digital Interface EQ HI 10 kHz ± 18 dB (shelving type) MID 1 kHz ± 18 dB (peaking type) LO 100 Hz ± 18 dB (shelving type) Fader (VR) Position at Standard Input / Output Input Fader 80 position INPUT 1 ~ 4 (TRS) +10 dBu, 1 kHz XLR Cannon Ø 6 mm TRS phone jack +4 dBu (XLR Cannon) -10 dBV (Ø 6 mm TRS phone jack) 10 k or more (XLR Cannon & Ø 6 mm TRS phone jack) D+5 LRCK DGND 1 2 3 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 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 0.01 SPDIF//ADAT C26 10/16 R41 100 D0 D1 D2 D3 D4 D5 D6 D7 A4 A3 A2 A1 A0 C12 C11 0.01 ADO[1...4] 8 DIGITAL I/F, DIGITAL, MAIN, VM88 FS256 10 9 74VHC00 U914C R966 100 R40 47 DGND /CS_DIF /RST_DIF /WR_DIF /RD_DIF C30 100P DGND C44 100P 74VHC14 U903C /LRCK 12 13 74VHC00 U913D 5 A[0...4] /CS_DIF /RST_DIF /WR_DIF /RD_DIF D[0...7] A[0...4] BCK D[0...7] 6 11 ADO[1...4] FS256 /LRCK BCK CPU> CPU> CPU> CPU> CPU> 4 CPU> STOUT STOUT ADOA ADO2 ADO3 ADO4 ADO1 ADO2 ADO3 ADO4 C8 0.01 1. MAIN_D, ROOT 100 R965 100 0.01 1 3 5 7 Ø 6 mm TRS phone jack -40 dBu ~ +4 dBu 10 k or more DATA_IN LRCK FCONT1 PD1 100 X 4 PD2 MCK R967 0.01 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 SOUT1_MD SOUT2_MD TDI_FS1I TDI_FS0I 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 C10 0.01 C9 C7 DATA_IN 2 4 6 8 7. MAIN_D, GA_DIF 2. MAIN_D, CPU PLL XLR Cannon (MIC) Ø 6 mm TRS phone jack (LINE) -50 dBu ~ -10 dBu (MIC) -30 dBu ~ +10 dBu (LINE) 3 k or more (MIC) 10 k or more (LINE) pll.sch DATA_OUT EXT//INT PD2 MCK FS512 SPDIF//ADAT /PLL2_CONT LOCK2 FCONT2 / /PLL1_CONT SPDIFOUT DATA_IN LRCK FCONT1 PD1 SOUT_78 SOUT_56 SOUT_34 SOUT_12 4. MAIN_D, DSP1 2 5. MAIN_D, DSP3 6. MAIN_D, DSP SEL 8. MAIN_D, PLL Specification Unit Standard Input INPUT 1 ~ 4 Connector 0 dBV = 1 Vr.m.s., 0 dBu = 0.775 Vr.m.s. EXT//INT FS512 SOUT_78 SOUT_56 SOUT_34 SOUT_12 DATA_IN 1. SPECIFICATIONS 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 41 VM88 VM88 DSP SELECT, DIGITAL, MAIN, VM88 SELECTOR CPU (SBTO P20)> SCK_DSP ...