Alto_S-12_Mixer_Service_Manual电路图.pdf

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1、Service Manual Version: 1.2 Model: S12(12-CHANNEL MIXING CONSOLE) RadioFans.CN 收音机爱 好者资料库 CONTENTS 1. Specification 2. Block Diagram 3. Schematic Diagram 4. Printed Circuit Board 5. Wiring Diagram 6. Test Procedure 7. Electrical Parts List 8. Exploded Views & Mechanical Parts List 9. Notes RadioFans

2、.CN 收音机爱 好者资料库 20 8. TECHNICAL SPECIFICATIONS Mono input channels Microphone inputelectronically balanced, discrete input configuration Frequency response10Hz to 55kHz, +/-3dB Distortion (THD&N)0.005% at +4dBu, 1kHz Gain range0dB to 60dB(MIC), SNR (Signal Noise Rated)115dB Line inputelectronically b

3、alanced Frequency response10Hz to 55kHz, +/-3dB Distortion (THD&N)0.005% at +4dBu, 1kHz Sensitivity range+15dBu to 45dBu- Stereo input channels Line inputunbalanced Frequency response10Hz to 55kHz, +/-3dB Distortion (THD&N)0.005% at +4dBu, 1kHz Impedances Microphone input1.4Kohm. Channel Insert retu

4、rn2.5Kohm. All other inputs10Kohm or greater. Tape out1Kohm. All other output120ohm. Equalization Hi shelving+/-15dB 12kHz Mid bell+/-12dB 2.5kHz Low shelving+/-15dB 80Hz Low Cut filter75Hz, 18dB/oct. Main Mix Section Noise (Bus noise)Fader 0 dB, channels muted:-100.0dBr (ref.:+4dBu) Fader 0dB, all

5、input channels assigned and set to UNITY gain:-90dBr(ref.:+4dBu) Max output+22dBu balanced XLR, +22dBu unbalanced, 1/4 jacks AUX Return gain rangeOFF to +20dB AUX Sends max out+22dBu Power supply Main voltageUSA/Canada100-120V, 60Hz Europe210-240V, 50Hz U.K./Australia240V, 50Hz Power Consumption23wa

6、tts Fuse100-120V : T500mAL 200-240V : T250mAL Main connectionStandard IEC receptacle Physical Dimension (W D H)XX300mmX355mmX28/80mm (11.8x14.0 x0.8/3.1) Net weight4.04Kg (8.908lb) RadioFans.CN 收音机爱 好者资料库 1. SPECIFICATION (S12) 12345678 A B C D 87654321 D C B A S12- SCH- MAP.Sch Titel Size File: Dat

7、e: Drawn By: Sheet RevisionModel No: 12-May-2003 KEVIN LIN. ALTO MIXING CONSOLE 11of S- 12 BLOCK DIAGRAM VER020825 A3 MONO INPUT CHANNELS ( 1- 4 ) 2 1 3 MIC IN +48V 3- BAND EQ 12K2.5K80 HI PASS 2 1 3 LO CUT SG/OL LEFT-BUS RIGHT-BUS AUX-1 AUX-2 RIGHT- BUS LEFT- BUS AUX- 1 AUX- 2 STEREO INPUT CHANNELS

8、 (5- 12) EQ 12K2.5K80 LEFT- BUS RIGHT- BUS AUX- 1 AUX- 2 LEFT- BUS RIGHT- BUS STEREO AUX RETURN 2 2 1 3 EFX TO AUX-1 2 1 3 RIGHT- BUS LEFT- BUS AUX- 1 AUX- 1 AUX- 1 AUX SEND AUX- 2 MAIN OUT LEFT- BUS RIGHT- BUS 2TK TO MIX RIGHT- BUS LEFT- BUS TAPE IN RIGHT 2TK 2TK PHONES OUTPUT LEFT METER RIGHT METE

9、R 75Hz +/-15db 3- BAND EQ 12K2.5K80 +/-15db 3c 5e 1a 4d 2b LEFT 3c 5e 1a 4d 2b RIGHT MAIN MIX AUX SEND1 T R S AUX SEND2 T R S MAIN MIX LEFT T R S MAIN MIX RIGHT T R S CONTROL ROOM OUTPUT LEFT T R S RIGHT T R S PHONES T R S & PHONES CONTROL ROOM LEFT TAPE OUT 2 1 3 2 1 3 LEVEL AUX2 / DSP STEREO AUX R

10、ETURN 1 3c 5e 1a 4d 2b LEFT(MONO) 3c 5e 1a 4d 2b RIGHT AUX1 RETURN - + T R S RN TN T R S RN TN T R S RN TN T R S RN TN PAN PHANTOM LINE IN GAIN - + POWER - + - + - + LOMIDHI AUX1 AUX2 LEVEL POST PRE BALANCE AUX1 AUX2 LEVEL LOMIDHI SG/OL 3c 5e 1a 4d 2b LEFT(MONO) 3c 5e 1a 4d 2b RIGHT T R S RN TN T R

11、S RN TN - + - + MIC GAIN:060dB LINE IN TRIM:+15dB- 45dB AFL-L AFL-R SOLO(PFL) SOLO ON() AFL-L AFL-R SOLO(PFL) SOLO ON() AFL-L AFL-R SOLO(PFL) EFX SEND LEFT-BUS RIGHT-BUS AUX-1 AUX-2 SIP L SIP R SOLO(PFL) EFX SEND AFL L AFL R SOLO(PFL) PFL LED LOGIC SOLO CTRL SOLO ACTIVE (LEVEL SET) RETURN SOLO MODE

12、PFL () AFL() AUX2 / DSP 3c 5e 1a 4d 2b INSERT T R S RN TN ALT-3(L) ALT-4(R) ALT-3(L) ALT-4(R) ALT-4 ALT-3 ALT-4 ALT-3 AUX1 LEVEL AUX2 LEVEL +4dB/MIC +4dB/MIC ALT-3(L) ALT-4(R) ALT3-4 LEVEL ALT 3- 4 OUT ALT-3(L) T R S ALT-4(R) T R S ALT 3-4 TO MIX RIGHT- BUS LEFT- BUS ALT 3-4 MAIN MIX CONTROL ROOM SO

13、URCE MAIN/ALT MAIN/ALT 12 12 POST PRE 12 12 POST PRE POST PRE 2TK RIGHT LEFT 2 1 3 MIC5 IN +48V PHANTOM GAIN - + POWER CHANNEL 5,6 ONLY 2.Block Diagram 123456789101112 A B C D 121110987654321 D C B A EQ HI C96 18n(M) VR1 B50K R26 6K8 VR3 B50K R25 6K8 LO R91 10K C2 47u/25V 5 6 7 U1B 4580M R164 1M C15

14、2 22P R69 1K1 VR2 B50K R57 1K3 MID R1 910R C108 12n(M) R2 910R C72 33n(M) C73 33n(M) C132 12n(M) C120 18n(M) C3 47u/25V R189 5K1 VR5 W50K AUX- 1 R144 47K R154 4K7 C144 2.2u/50V R27 6K8 TR2 BR TR1 BR R176 1K5 +VCC LD3 RED R184 5K1 3 2 1 U1A 4580M VR7A 10KD PEAK R250 18K C154 22P VR4 W50K C4 47u/25V R

15、188 5K1 AUX- 2 LEVEL AUX- POST VR6A JQ10K VR6B JQ10K R185 5K1 R187 5K1 LEFT- BUS RIGHT- BUS PAN PGND AUX- PRE 80HZ 2.5K J1 POST (PRE) TP1C1 47u/25V EQ HI 12KHZ C98 18n(M) VR29A B50K R29 6K8 VR31A B50K R28 6K8 LO R93 10K C5 47u/25V 3 2 1 U5A 4580M R165 1M C156 22P R70 1K1 VR30A B50K R58 1K3 MID R3 91

16、0R C109 12n(M) R4 910R C74 33n(M) C75 33n(M) C133 12n(M) C122 18n(M) C6 47u/25V R145 47K R155 4K7 C145 2.2u/50V R32 6K8 TR4 BR TR3 BR R177 1K5 +VCC LD15 RED R190 5K1 3 2 1 U6A 4580M VR35B 10KD PEAK R254 18K C158 22P C10 47u/25V LEVEL VR34A JQ10K VR34B JQ10K BAL PGND 80HZ 2.5K EQ HI 12KHZ C99 18n(M)

17、VR29B B50K R31 6K8 VR31B B50K R30 6K8 LO R102 10K C7 47u/25V 5 6 7 U5B 4580M R166 1M C157 22P R71 1K1 VR30B B50K R59 1K3 MID R5 910R C110 12n(M) R6 910R C76 33n(M) C77 33n(M) C134 12n(M) C123 18n(M) C8 47u/25V 80HZ 2.5K R94 10K R95 10K R191 5K1 5 6 7 U6B 4580M VR35A 10KD R251 18K C159 22P C9 47u/25V

18、 LEVEL R98 10K R97 10K TP2 S12MN1.SCH Titel Size File: Date: Drawn By: Sheet RevisionModel No: 12-May-2003 KEVIN LIN. MAIN INPUT STAGE 31of ALTO S-12 VER021115 A1 2 1 3 SW2A PS- 42E85L 5 4 6 SW2B PS- 42E85L 8 7 9 SW2C PS- 42E85L 11 10 12 SW2D PS- 42E85L ALT- 3 ALT- 4 2 1 3 SW1A PS- 22E85L 5 4 6 SW1B

19、 PS- 22E85L 2 1 3 SW3A PS- 42E85L 5 4 6 SW3B PS- 42E85L 8 7 9 SW3C PS- 42E85L 11 10 12 SW3D PS- 42E85L AFL- L AFL- R R268 27K R269 27K AUX1 PRE/POST SW2:MUTE/ALT3- 4 SW3:SOLO,PFL R92 10K SOLO(PFL) D2 BAS316 LOGIC LD2 YEL (SOLO) LD1 RED - VCC (MUTE/ALT3- 4) CH1 11 10 12 SW5D PS- 42E85L LD4 REDCH2 11

20、10 12 SW8D PS- 42E85L LD7 REDCH3 11 10 12 SW11D PS- 42E85L LD10 REDCH4 11 10 12 SW14D PS- 42E85L LD13 REDCH5/6 11 10 12 SW17D PS- 42E85L LD16 REDCH7/8 11 10 12 SW20D PS- 42E85L LD19 REDCH9/10 11 10 12 SW23D PS- 42E85L LD22 REDCH11/12 R82 2K2 - VCC (LOGIC=2.0V or 0.5V) EQ HI C97 18n(M) VR8 B50K R34 6

21、K8 VR10 B50K R33 6K8 LO R99 10K C12 47u/25V 5 6 7 U2B 4580M R167 1M C153 22P R72 1K1 VR9 B50K R60 1K3 MID R7 910R C111 12n(M) R8 910R C78 33n(M) C79 33n(M) C135 12n(M) C121 18n(M) C14 47u/25V R202 5K1 VR12 W50K AUX- 1 R146 47K R156 4K7 C146 2.2u/50V R35 6K8 TR6 BR TR5 BR R178 1K5 +VCC LD6 RED R196 5

22、K1 3 2 1 U2A 4580M VR14A 10KD PEAK R255 18K C155 22P VR11 W50K C16 47u/25V R201 5K1 AUX- 2 LEVEL AUX- POST VR13A JQ10K VR13B JQ10K R186 5K1 R199 5K1 LEFT- BUS RIGHT- BUS PAN PGND AUX- PRE 80HZ 2.5K J2 POST (PRE) TP3C11 47u/25V 2 1 3 SW5A PS- 42E85L 5 4 6 SW5B PS- 42E85L 8 7 9 SW5C PS- 42E85L ALT- 3

23、ALT- 4 2 1 3 SW4A PS- 22E85L 5 4 6 SW4B PS- 22E85L 2 1 3 SW6A PS- 42E85L 5 4 6 SW6B PS- 42E85L 8 7 9 SW6C PS- 42E85L 11 10 12 SW6D PS- 42E85L AFL- L AFL- R R272 27K R273 27K AUX1 PRE/POST SW5:MUTE/ALT3- 4 SW6:SOLO,PFL R100 10K SOLO(PFL) D4 BAS316 LOGIC LD5 YEL (SOLO) R84 2K2 - VCC (LOGIC=2.0V or 0.5

24、V) EQ HI C100 18n(M) VR15 B50K R43 6K8 VR17 B50K R41 6K8 LO R109 10K C13 47u/25V 5 6 7 U3B 4580M R168 1M C160 22P R74 1K1 VR16 B50K R61 1K3 MID R13 910R C114 12n(M) R15 910R C84 33n(M) C85 33n(M) C136 12n(M) C124 18n(M) C15 47u/25V R213 5K1 VR19 W50K AUX- 1 R148 47K R158 4K7 C148 2.2u/50V R45 6K8 TR

25、10 BR TR9 BR R180 1K5 +VCC LD9 RED R197 5K1 3 2 1 U3A 4580M VR21A 10KD PEAK R256 18K C161 22P VR18 W50K C17 47u/25V R212 5K1 AUX- 2 LEVEL AUX- POST VR20A JQ10K VR20B JQ10K R198 5K1 R200 5K1 LEFT- BUS RIGHT- BUS PAN PGND AUX- PRE 80HZ 2.5K J3 POST (PRE) TP5C24 47u/25V 2 1 3 SW8A PS- 42E85L 5 4 6 SW8B

26、 PS- 42E85L 8 7 9 SW8C PS- 42E85L ALT- 3 ALT- 4 2 1 3 SW7A PS- 22E85L 5 4 6 SW7B PS- 22E85L 2 1 3 SW9A PS- 42E85L 5 4 6 SW9B PS- 42E85L 8 7 9 SW9C PS- 42E85L 11 10 12 SW9D PS- 42E85L AFL- L AFL- R R276 27K R277 27K AUX1 PRE/POST SW8:MUTE/ALT3- 4 SW9:SOLO,PFL R110 10K SOLO(PFL) D6 BAS316 LOGIC LD8 YE

27、L (SOLO) R86 2K2 - VCC (LOGIC=2.0V or 0.5V) EQ HI C104 18n(M) VR22 B50K R44 6K8 VR24 B50K R42 6K8 LO R119 10K C26 47u/25V 5 6 7 U4B 4580M R171 1M C167 22P R77 1K1 VR23 B50K R64 1K3 MID R14 910R C115 12n(M) R16 910R C90 33n(M) C91 33n(M) C139 12n(M) C128 18n(M) C27 47u/25V R222 5K1 VR26 W50K AUX- 1 R

28、150 47K R160 4K7 C150 2.2u/50V R51 6K8 TR16 BR TR15 BR R182 1K5 +VCC LD12 RED R209 5K1 3 2 1 U4A 4580M VR28A 10KD PEAK R259 18K C168 22P VR25 W50K C28 47u/25V R221 5K1 AUX- 2 LEVEL AUX- POST VR27A JQ10K VR27B JQ10K R210 5K1 R211 5K1 LEFT- BUS RIGHT- BUS PAN PGND AUX- PRE 80HZ 2.5K J4 POST (PRE) TP6C

29、25 47u/25V 2 1 3 SW11A PS- 42E85L 5 4 6 SW11B PS- 42E85L 8 7 9 SW11C PS- 42E85L ALT- 3 ALT- 4 2 1 3 SW10A PS- 22E85L 5 4 6 SW10B PS- 22E85L 2 1 3 SW12A PS- 42E85L 5 4 6 SW12B PS- 42E85L 8 7 9 SW12C PS- 42E85L 11 10 12 SW12D PS- 42E85L AFL- L AFL- R R278 27K R279 27K AUX1 PRE/POST SW11:MUTE/ALT3- 4 S

30、W12:SOLO,PFL R111 10K SOLO(PFL) D8 BAS316 LOGIC LD11 YEL (SOLO) R89 2K2 - VCC (LOGIC=2.0V or 0.5V) R192 5K1 R193 5K1 LEFT- BUS RIGHT- BUS 2 1 3 SW14A PS- 42E85L 5 4 6 SW14B PS- 42E85L ALT- 3 ALT- 4 2 1 3 SW15A PS- 42E85L 5 4 6 SW15B PS- 42E85L AFL- L AFL- R R270 27K R271 27K R195 5K1 VR33 W50K AUX-

31、1 VR32 W50K R194 5K1 AUX- 2 AUX- POST AUX- PRE J5 POST (PRE) 8 7 9 SW14C PS- 42E85L 2 1 3 SW13A PS- 22E85L 5 4 6 SW13B PS- 22E85L 8 7 9 SW15C PS- 42E85L AUX1 PRE/POST R96 10K SOLO(PFL) 11 10 12 SW15D PS- 42E85L D3 BAS316 LOGIC LD14 YEL (SOLO) R83 2K2 - VCC (LOGIC=2.0V or 0.5V) SW14:MUTE/ALT3- 4 SW15

32、:SOLO,PFL EQ HI 12KHZ C101 18n(M) VR36A B50K R37 6K8 VR38A B50K R36 6K8 LO R101 10K C18 47u/25V 3 2 1 U7A 4580M R169 1M C162 22P R75 1K1 VR37A B50K R62 1K3 MID R9 910R C112 12n(M) R10 910R C80 33n(M) C81 33n(M) C137 12n(M) C125 18n(M) C19 47u/25V R147 47K R157 4K7 C147 2.2u/50V R40 6K8 TR8 BR TR7 BR

33、 R179 1K5 +VCC LD18 RED R203 5K1 3 2 1 U8A 4580M VR42B 10KD PEAK R258 18K C164 22P C23 47u/25V LEVEL VR41A JQ10K VR41B JQ10K BAL PGND 80HZ 2.5K EQ HI 12KHZ C103 18n(M) VR36B B50K R39 6K8 VR38B B50K R38 6K8 LO R103 10K C20 47u/25V 5 6 7 U7B 4580M R170 1M C163 22P R76 1K1 VR37B B50K R63 1K3 MID R11 91

34、0R C113 12n(M) R12 910R C82 33n(M) C83 33n(M) C138 12n(M) C127 18n(M) C21 47u/25V 80HZ 2.5K R104 10K R105 10K R204 5K1 5 6 7 U8B 4580M VR42A 10KD R257 18K C165 22P C22 47u/25V LEVEL R108 10K R107 10K TP4 R205 5K1 R206 5K1 LEFT- BUS RIGHT- BUS 2 1 3 SW17A PS- 42E85L 5 4 6 SW17B PS- 42E85L ALT- 3 ALT-

35、 4 2 1 3 SW18A PS- 42E85L 5 4 6 SW18B PS- 42E85L AFL- L AFL- R R274 27K R275 27K R208 5K1 VR40 W50K AUX- 1 VR39 W50K R207 5K1 AUX- 2 AUX- POST AUX- PRE J6 POST (PRE) 8 7 9 SW17C PS- 42E85L 2 1 3 SW16A PS- 22E85L 5 4 6 SW16B PS- 22E85L 8 7 9 SW18C PS- 42E85L AUX1 PRE/POST R106 10K SOLO(PFL) 11 10 12

36、SW18D PS- 42E85L D5 BAS316 LOGIC LD17 YEL (SOLO) R85 2K2 - VCC (LOGIC=2.0V or 0.5V) SW17:MUTE/ALT3- 4 SW18:SOLO,PFL EQ HI 12KHZ C102 18n(M) VR43A B50K R47 6K8 VR45A B50K R46 6K8 LO R112 10K C29 47u/25V 3 2 1 U9A 4580M R172 1M C169 22P R78 1K1 VR44A B50K R65 1K3 MID R17 910R C116 12n(M) R18 910R C86

37、33n(M) C87 33n(M) C140 12n(M) C126 18n(M) C31 47u/25V R149 47K R159 4K7 C149 2.2u/50V R50 6K8 TR12 BR TR11 BR R181 1K5 +VCC LD21 RED R214 5K1 3 2 1 U10A 4580M VR49B 10KD PEAK R261 18K C166 22P C35 47u/25V LEVEL VR48A JQ10K VR48B JQ10K BAL PGND 80HZ 2.5K EQ HI 12KHZ C106 18n(M) VR43B B50K R49 6K8 VR4

38、5B B50K R48 6K8 LO R113 10K C32 47u/25V 5 6 7 U9B 4580M R173 1M C171 22P R80 1K1 VR44B B50K R66 1K3 MID R19 910R C117 12n(M) R20 910R C88 33n(M) C89 33n(M) C142 12n(M) C130 18n(M) C33 47u/25V 80HZ 2.5K R114 10K R115 10K R215 5K1 5 6 7 U10B 4580M VR49A 10KD R260 18K C172 22P C34 47u/25V LEVEL R118 10

39、K R117 10K TP7 R217 5K1 R218 5K1 LEFT- BUS RIGHT- BUS 2 1 3 SW20A PS- 42E85L 5 4 6 SW20B PS- 42E85L ALT- 3 ALT- 4 2 1 3 SW21A PS- 42E85L 5 4 6 SW21B PS- 42E85L AFL- L AFL- R R280 27K R281 27K R220 5K1 VR47 W50K AUX- 1 VR46 W50K R219 5K1 AUX- 2 AUX- POST AUX- PRE J7 POST (PRE) 8 7 9 SW20C PS- 42E85L

40、2 1 3 SW19A PS- 22E85L 5 4 6 SW19B PS- 22E85L 8 7 9 SW21C PS- 42E85L AUX1 PRE/POST R116 10K SOLO(PFL) 11 10 12 SW21D PS- 42E85L D7 BAS316 LOGIC LD20 YEL (SOLO) R88 2K2 - VCC (LOGIC=2.0V or 0.5V) SW20:MUTE/ALT3- 4 SW21:SOLO,PFL EQ HI 12KHZ C105 18n(M) VR50A B50K R53 6K8 VR52A B50K R52 6K8 LO R120 10K

41、 C30 47u/25V 3 2 1 U11A 4580M R174 1M C170 22P R79 1K1 VR51A B50K R67 1K3 MID R21 910R C118 12n(M) R22 910R C92 33n(M) C93 33n(M) C141 12n(M) C129 18n(M) C37 47u/25V R151 47K R161 4K7 C151 2.2u/50V R56 6K8 TR18 BR TR17 BR R183 1K5 +VCC LD24 RED R216 5K1 3 2 1 U12A 4580M VR56B 10KD PEAK R262 18K C173

42、 22P C36 47u/25V LEVEL VR55A JQ10K VR55B JQ10K BAL PGND 80HZ 2.5K EQ HI 12KHZ C107 18n(M) VR50B B50K R55 6K8 VR52B B50K R54 6K8 LO R121 10K C38 47u/25V 5 6 7 U11B 4580M R175 1M C174 22P R81 1K1 VR51B B50K R68 1K3 MID R23 910R C119 12n(M) R24 910R C94 33n(M) C95 33n(M) C143 12n(M) C131 18n(M) C39 47u

43、/25V 80HZ 2.5K R122 10K R123 10K R223 5K1 5 6 7 U12B 4580M VR56A 10KD R263 18K C175 22P C40 47u/25V LEVEL R126 10K R125 10K TP8 R224 5K1 R225 5K1 LEFT- BUS RIGHT- BUS 2 1 3 SW23A PS- 42E85L 5 4 6 SW23B PS- 42E85L ALT- 3 ALT- 4 2 1 3 SW24A PS- 42E85L 5 4 6 SW24B PS- 42E85L AFL- L AFL- R R282 27K R283

44、 27K R227 5K1 VR54 W50K AUX- 1 VR53 W50K R226 5K1 AUX- 2 AUX- POST AUX- PRE J8 POST (PRE) 8 7 9 SW23C PS- 42E85L 2 1 3 SW22A PS- 22E85L 5 4 6 SW22B PS- 22E85L 8 7 9 SW24C PS- 42E85L AUX1 PRE/POST R124 10K SOLO(PFL) 11 10 12 SW24D PS- 42E85L D9 BAS316 LOGIC LD23 YEL (SOLO) R90 2K2 - VCC (LOGIC=2.0V o

45、r 0.5V) SW23:MUTE/ALT3- 4 SW23:SOLO,PFL 84 U3C 4580M 84 U6C 4580M 84 U2C 4580M 84 U5C 4580M 84 U8C 4580M 84 U11C 4580M 84 U12C 4580M 84 U9C 4580M 84 U1C 4580M 84 U4C 4580M 84 U7C 4580M 84 U10C 4580M C197 100n C198 100n C199 100n C200 100n C201 100n C202 100n C203 100n C204 100n C205 100n C206 100n C

46、207 100n C208 100n C209 100n C210 100n C211 100n C212 100n C215 100n C216 100n C217 100n C218 100n C219 100n C220 100n C221 100n C222 100n +VCC - VCC TR19 HR R287 120R 1/4W R286 510R +VCC CR- A S12MN1- 2 S12MN1- 2.SCH CTRL- R CTRL- R.SCH RTN- CH1 RTN- CH2 RTN- CH3 RTN- CH4 PRE- CH5 PRE- CH6 PRE- CH7

47、 PRE- CH8 PRE- CH9 PRE- CH10 PRE- CH11 PRE- CH12 RTN- CH1 RTN- CH2 RTN- CH3 RTN- CH4 PRE- CH5 PRE- CH6 PRE- CH7 PRE- CH8 PRE- CH9 PRE- CH10 PRE- CH11 PRE- CH12 LOGIC LOGIC LOGIC LOGIC LOGIC LOGIC LOGIC LOGIC PCB# S12MN1.PCB 3. Schematic Diagram 12345678 A B C D 87654321 D C B A S12MN1- 2.SCH Titel S

48、ize File: Date: Drawn By: Sheet RevisionModel No: 12-May-2003 KEVIN LIN. PCB#S12MN1.PCB 23of ALTO S-12 VER021115 A2 5 6 7 U13B 4580M 3 2 1 U13A 4580M R229 5K1 C176 22P LEFT-BUS RIGHT-BUS C177 22P R228 5K1 C42 47u/25V C41 47u/25V 3 2 1 U14A 4580M 3 2 1 U15A 4580M R265 18K C179 22P R230 5K1 VR62A 10KD

49、 MAIN MIX VR63A 10KD R264 18K C178 22P R231 5K1 C43 47u/25V C44 47u/25V R128 10K R127 10K MAIN MIX LEFT RIGHT MAIN-L-2 MAIN-R-2 R131 10K R288 22K C260 100P C46 47u/25V R130 10K R289 22K VR58B W50K VR58A W50K 3 2 1 U20A 4580M 5 6 7 U20B 4580M R292 56K C263 22P C47 47u/25V R236 5K1 R293 56K C264 22P C48 47u/25V R237 5K1 R239 5K1 R238 5K1 AUX RETURN 1 R326 68K R325 68K EFX TO AUX1 AUX- 1 AUX- 1 LEFT-BUS RIGHT-BUS R133 10K R290 22K R134 10K R291 22K VR57B W50K VR57A W50K 3 2 1 U21A 4580M 5 6 7 U21B 4580M R294 56K C265 22P C55 47u/25V R309 20K R295 56K C266 22P C56 47u/25V R310 20K AUX