Service Manual Model VC-8 ADAT/ANALOG Converter CAUTION: CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN TO PREVENT ELECTRIC SHOCK, MATCH WIDE BLADE OF PLUG TO WIDE SLOT, FULLY INSERT. CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER (OR BACK). NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. ATTENTION: POUR ÉVITER LES CHOCS ÉLECTRIQUES, INTRODUIRE LA LAME LA PLUS LARGE DE L A F I C H E D A N S L A B O R N E C O R R ESPONDANTE DE LA PRISE ET POUSSER JUSQU' AU FOND. 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. 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. "WARNING" "TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE." SAFETY INSTRUCTIONS 1. 2. 3. 4. 5. 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. 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. 10. 11. 12. 6. 13. 14. 15. 16. 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. 7. 8. 17 VC-8 TABLE OF CONTENTS 1. 2. 3. 4. 5. 6. SPECIFICATIONS ............................................................................................. 4 CONTROLS, INDICATORS AND CONNECTORS ..................................... 5 EXPLODED VIEW ........................................................................................... 6 PARTS LIST ...................................................................................................... 8 PCB PATTERN DRAWING .......................................................................... 10 CIRCUIT DIAGRAMS ................................................................................... 12 NOTES * Parts List and circuit diagrams are given in this manual to assist the service technician in maintaining the Model VC-8. * The following accessories are supplied with VC-8 as the standard accessories. Owner's manual, VC-8, MLT : 8288444000 AC adaptor AD-12A : 8270727003 (for USA/CND) : 8270727006 (for EUR) : 8270727007 (for UK) : 8270727010 (for JPN) * Following is the packing material for the Model VC-8. PACK, SIDE, L, DE-1 : 8228454000 PACK, SIDE, R, DE-1 : 8228455000 CARTON, INNER, VC-8 : 8228727000 CARTON, OUTER, VC-8 : 8228906000 CAUTION 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. 3 VC-8 1. SPECIFICATIONS INPUT 1~8 Connector Input Impedance Input Level (Specification Unit : 0 dBV = 1 Vrms) RCA pin jack 20k or more -10dBV RCA pin jack 10k or more -10dBV Square shape optical IEC60958 (S/P DIF) ALESIS Proprietary Multi Channel Optical Interface BNC type Terminate switch ON : 75 Terminate switch OFF : Hi impedance Hi Level : 3.5~5V Lo Level : 0~1V 20-bit linear 20 bit 64 times over sampling modulation 20 bit 128times over sampling modulation INT mode : 44.1kHz OPTICAL/WORD mode : 32~48kHz +1, -2dB (20Hz~20kHz) 90dB or more 0.008% or less (at 1kHz,+2dB) 80dB or more (at 1kHz) 90dB or more 20° or less Power ON/OFF : -20dBV or less 220 (W) x 43 (H) x 200 (D) mm 1.0kg (Excluding accessories) DC12V, 600mA, Exclusive AC Adaptor (AD-12A) OUTPUT 1~8 Connector Load Impedance Output Level DATA IN/OUT Connector Format WORD IN Connector Input Impedance Input Level DIGITAL SECTION Quantization AD Converter DA Converter Sampling Frequency CHARACTERISTICS Overall Frequency Responce Dynamic Range (overall) T.H.D. Channel Separation S/N (overall) Phase Difference between Channel Click Noise GENERAL Dimensions Weight Power Supply * Specifications and appearance are subjects to change without notice for product improvement. * Adat and the marks are trademarks of Alesis Corporation. 4 VC-8 2. CONTROLS, INDICATORS AND CONNECTORS < Front Side > ADAT/ANALOG CONVERTER OPTICAL CLOCK 75 ON OFF WORD OPTICAL INT(44.1k) LOCKED ANALOG INPUT MODE 1-2 1-4 1-8 DIGITAL MODE ADAT S/P DIF POWER STBY ON 1 2 1. 2. 3. 4. 5. 6. 7. 3 4 5 6 7 WORD IN terminate switch LOCKED LED CLOCK select switch ANALOG INPUT MODE switch DIGITAL MODE select switch POWER switch POWER LED < Rear Side > 8 8 IN AD-12A ONLY 7 9 6 5 4 3 2 1 11 12 13 IN OUT 12V DC IN OUT 8 7 6 5 4 ANALOG 3 2 1 WORD IN DIGITAL OPTICAL 10 8. 9. 10. 11. 12. 13. DC IN jack [Center: Plus +] ANALOG INPUT connectors 1~8 [RCA] ANALOG OUTPUT connectors 1~8 [RCA] WORD IN connector [BNC] DIGITAL INPUT connectors [Square shape optical] DIGITAL OUTPUT connectors [Square shape optical] 5 VC-8 3. EXPLODED VIEW 1 BBT3x8 BZn BBT3x8 BZn BBT3x8 BZn 2 BBT3x8 BZn B3x6 CZn BBT3x8 BZn B3x6 BZn BBT3x8 BZn 3 4 5 BBT3x8 BZn 6 VC-8 Ref. No. 1 2 Part No. 8221288000 8270727003 8270727006 8270727007 8270727010 8274201000 8221291000 8221290000 8260561000 Description PANEL ,TOP, DE-1 AC ADAPTOR, AD-12A, USA/CND AC ADAPTOR, AD-12A, EUR AC ADAPTOR, AD-12A, UK AC ADAPTOR, AD-12A, JPN PCB_ASSY, VC-8 CHASSIS, VC-8 PANEL, FRONT, VC-8 FOOT_ASSY, S 3 4 5 CAUTION : The "PARITY SW (S001)" on the MAIN PCB assy must be set "ON". 7 VC-8 4. Ref. No. B101 PARTS LIST Ref. No. R009 R010 R011~013 R014 R015 R016 R017 R018 R019 R020, 021 R022 R023 R024, 025 R026 R027 R029 R030 R031, 032 R033, 034 R035 R036 R037 R038, 039 R040 R041~043 R044 R045 R048 R049 R050, 051 R054 R055 R056 R057 R058 R059 R060, 061 R062 R063, 064 R065 R101~801 R102~802 R103~803 R104~804 R105~805 R106~806 R109~809 R111~811 R112~812 R113~813 R114~814 R151~451 R152~452 R153~453 R156~856 Part No. RESISTORs Description ST, CARBON, 1/10W, 330, 5% ST, CARBON, 1/10W, 100, 5% ST, CARBON, 1/10W, 10K, 5% ST, CARBON, 1/10W, 100, 5% ST, CARBON, 1/10W, 750, 5% ST, CARBON, 1/10W, 4.7K, 5% ST, CARBON, 1/10W, 330, 5% ST, CARBON, 1/10W, 100, 5% ST, CARBON, 1/10W, 1K, 5% ST, CARBON, 1/10W, 10K, 5% R, ST, ARRAY, 100x4, 5%, CN1J4 ST, CARBON, 1/10W, 100, 5% ST, CARBON, 1/10W, 10K, 5% ST, CARBON, 1/10W, 2.2K, 5% ST, CARBON, 1/10W, 1K, 5% ST, CARBON, 1/10W, 100K, 5% ST, CARBON, 1/10W, 560, 5% ST, CARBON, 1/10W, 1.5K, 5% ST, CARBON, 1/10W, 220K, 5% ST, CARBON, 1/10W, 100, 5% ST, CARBON, 1/10W, 680, 5% ST, CARBON, 1/10W, 100, 5% ST, CARBON, 1/10W, 680, 5% ST, CARBON, 1/10W, 100K, 5% ST, CARBON, 1/10W, 100K, 5% ST, CARBON, 1/10W, 10K, 5% ST, CARBON, 1/10W, 100, 5% ST, CARBON, 1/10W, 10K, 5% ST, CARBON, 1/10W, 100, 5% ST, CARBON, 1/10W, 75, 5% ST, CARBON, 1/10W, 10K, 5% ST, CARBON, 1/10W, 1.5, 5% ST, CARBON, 1/10W, 1M, 5% ST, CARBON, 1/10W, 560, 5% ST, CARBON, 1/10W, 10K, 5% ST, CARBON, 1/10W, 47K, 5% ST, CARBON, 1/10W, 100, 5% ST, CARBON, 1/10W, 18K, 5% ST, CARBON, 1/10W, 7.5K, 5% ST, CARBON, 1/10W, 10K, 5% ST, CARBON, 1/10W, 10K, 5% ST, CARBON, 1/10W, 330, 5% ST, CARBON, 1/10W, 330, 5% ST, CARBON, 1/10W, 100K, 5% ST, CARBON, 1/10W, 10K, 5% ST, CARBON, 1/10W, 12K, 5% ST, CARBON, 1/10W, 2.2K, 5% ST, CARBON, 1/10W, 100K, 5% ST, CARBON, 1/10W, 10, 5% ST, CARBON, 1/10W, 100, 5% ST, CARBON, 1/10W, 10, 5% ST, CARBON, 1/10W, 100, 5% Part No. Description 8230500331 8230500101 8230500103 8230500101 8230500751 8230500472 non 8230500331 non 8230500101 non 8230500102 8230500103 8230508101 8230500101 8230500103 8230500222 8230500102 8230500104 8230500561 8230500152 8230500224 8230500101 8230500681 8230500101 8230500681 8230500104 8230500104 8230500103 8230500101 8230500103 8230500101 8230500750 8230500103 8230500159 8230500105 8230500561 8230500103 8230500473 8230500101 8230500183 8230500752 8230500103 8230500103 8230500331 8230500331 8230500104 8230500103 8230500123 8230500222 8230500104 8230500100 8230500101 8230500100 8230500101 · MAIN PCB ASSY 8274201000 PCB_ASSY, VC-8 8251525200 PLAIN_PCB, VC-8 ICs Description ST, AN, REGULATOR, UPD29M10T ST, AN, REGULATOR, L78M05T-TL ST, TSSOP, 74VHCU04 QFP, DG, GATE_ARRAY, DIF ST, AN, RESET, NJM2103M ST, TSSOP, TC74VHC163 ST, TSSOP, TC74VHC153 ST, DG, VCO, TC9246F ST, DG, DRIVER, DTC114EK ST, TSSOP, 74VHC74 ST, TSSOP, 74VHC00 ST, TSSOP, 74VHC161 ST, TSSOP, 74VHC86 ST, DG, DRIVER, DTC114EK ST, DG, DRIVER, DTB114TK ST, TSSOP, 74VHC74 ST, TSSOP, 74VHCU04 ST, DG, VCO, TC9246F ST, DG, DRIVER, DTA114EK ST, TSSOP, 74VHC157 ST, TSSOP, 74VHC00 ST, AN, DC-DC, NJM2360AM ST, DG, DRIVER, DTA114EK ST, AN, OPAMP, NJM2115M(TEI) ST, DG, ADDA, AK4522 ST, AN, OPAMP, NJM4565M ST, DG, DRIVER, DTC314TK DIODEs Description OPT, VT, LED, GRN, LT3K8B D, ST, DAN202K D, ST, RB400D OPT, V, LED, GRN-RED, GL3ED8 D, ST, DAN202K D, VT, SCHOTTKEY, EK03W D, ST, DAN202K Ref. No. U001 U002~004 U005 U006 U007 U008, 009 U010, 011 U012 U013, 014 U015~017 U018 U019 U020 U021, 022 U023 U024 U025 U026 U027 U029, 030 U031 U032 U034, 035 U101~801 U151~451 U153~453 U157~857 Part No. 8236541610 8236540301 8236545904 8236085000 8236502500 8236545163 8236545153 8236503400 8236570101 8236545074 8236545000 8236545161 8236545086 8236570101 8236570801 8236545074 8236545904 8236503400 8236570401 8236545157 8236545000 8236541300 8236570401 8236505011 8236541700 8236541200 8236570201 Ref. No. D001 D002 D003 D004 D005 D006, 007 D008 D009~011 Part No. 8234101400 8234502800 8234750600 non 8234202700 8234502800 8234108400 8234502800 Ref. No. R001 R002 R003 R004 R005 R006 R007 R008 Part No. RESISTORs Description ST, CARBON, 1/10W, 680, 5% ST, CARBON, 1/10W, 100, 5% ST, CARBON, 1/10W, 3.3K, 5% ST, CARBON, 1/10W, 2.2K, 5% ST, CARBON, 1/10W, 1M, 5% ST, CARBON, 1/10W, 0, 5% ST, CARBON, 1/10W, 100, 5% ST, CARBON, 1/10W, 560, 5% 8230500681 8230500101 8230500332 8230500222 8230500105 8230500000 8230500101 8230500561 8 VC-8 Ref. No. C001~003 C004 C005~008 C009 C010~012 C013~020 C021~024 C025 C026, 027 C028, 029 C030~034 C035 C036~042 C043, 044 C045 C046 C047, 048 C049~051 C052 C053 C054 C055 C056 C057 C058 C059~062 C063 C064 C065 C066 C067 C068, 069 C070 C071 C072 C073 C074 C075 C076 C077 C078 C079 ...