McIntosh-C2300-pre-sm维修电路原理图.pdf

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1、C2300 SERVICE MANUAL Performance Specifications .2 Notes .2 Rear Panel .3 Section Location .3 Block Diagram .4 Interconnection Diagram .5 - 6 Main Schematic and PCB .9 - 22 Display Schematic and PCB.23 - 28 Balanced Schematic and PCB .29 - 34 Tube Schematic and PCB .35 - 42 Data Schematic and PCB .4

2、3 - 46 Pushbutton Schematic and PCB .47 - 48 Headphone Schematic and PCB .49 - 50 Meter Lamp Schematic and PCB .51 - 52 Parts List .53 - 62 Repacking Instruction .63 CONTENTS SERIAL NO. YA1001 And Above C2300 TUBE PREAMPLIFIER RadioFans.CN 收音机爱 好者资料库 PERFORMANCE SPECIFICATIONS General Specifications

3、 Frequency Response +0, -0.5dB from 20Hz to 20,000Hz +0, -1dB from 10Hz to 100,000Hz Total Harmonic Distortion 0.08% from 20Hz to 20,000Hz Rated Output (Main) 2.5V Unbalanced, 5V Balanced Maximum Voltage Output 8V RMS Unbalanced, 16V RMS Balanced Sensitivity (for rated output) High Level, 450mV unba

4、lanced, 900mV balanced Phono MM, 4.5mV Phono MC, 0.45mV Signal To Noise Ratio (A-Weighted) High Level, 93dB Phono, 80dB Input Impedance High Level, 20K ohms unbalanced, 40k ohms balanced Phono MM, 47K ohms; 50 to 750pF, in 50pF steps Phono MC, 25, 50, 100, 200, 500 or 1,000 ohms; 100pF Maximum Input

5、 Signal High Level, 5V Unbalanced, 10V Balanced Phono MM, 50mV Phono MC, 5mV Voltage Gain High Level to SRVR(REC) Output: 0dB High Level to Main Output: 15dB Phono MM to Record Output: 40dB Phono MC to Record Output: 60dB Output Impedance 220 ohms Headphone Load Impedance 16 ohms to 250 ohms Tube Co

6、mpliment MM Phono Circuitry: 2 - 12AX7A MC Phono Circuitry: 2 - 12AX7A High Level Circuitry: 2 - 12AX7A Power Requirements 100 Volts, 50/60Hz at 75 watts 110 Volts, 50/60Hz at 75 watts 120 Volts, 50/60Hz at 75 watts 220 Volts, 50/60Hz at 75 watts 230 Volts, 50/60Hz at 75 watts 240 Volts, 50/60Hz at

7、75 watts Standby Power, less than 2 watts Note: Refer to the rear panel of the C2300 for the correct voltage. Overall Dimensions Width is 17-1/2 inches (44.45cm) Height is 6 inches (15.24cm) including feet Depth is 18 inches (45.72cm) including the Front Panel, Knobs and Cables Weight 29.5 pounds (1

8、3.41 kg) net, 44.9 pounds (20.41 kg) in shipping carton Shipping Carton Dimensions Width is 25 inches (63.5cm) Depth is 27 inches (68.6cm) Height is 12 inches (30.5cm) NOTES 1. The heavy lines on the schematic denote the primary signal path. 2. Unless otherwise noted, all voltages indicated on the s

9、chematics are measured under the following condi- tions: a. AC input at 120 volts, 50/60Hz. b. All voltages are +/-10% with respect to ground. A high impedance (10 megaohm) voltmeter must be used. 3.Unlessotherwisespecified: a. Resistor values are in ohms. b. Capacitor values are microfarads (uF). c

10、. Inductor values are in microhenries (uH). 4. On PC board drawings, Square pad indicates: a. Polarized Capacitors - Positive b. Diodes - Cathode c. Others - Pin 1 5. WARNING Parts marked with the symbol have critical characteristics. Use only replacement parts recom- mended by the manufacturer. 6.

11、Use McIntosh Remote Control Model HR061 with the C2300. 2 RadioFans.CN 收音机爱 好者资料库 C2300 SECTION LOCATION REAR PANEL 3 RadioFans.CN 收音机爱 好者资料库 BLOCK DIAGRAM 4 RadioFans.CN 收音机爱 好者资料库 C2300 INTERCONNECT 1 56 RadioFans.CN 收音机爱 好者资料库 NOTES 78 RadioFans.CN 收音机爱 好者资料库 C2300 910 GND GND 51.1 R 62 3B 3B 3B

12、3B 249 R 63 INPUTS 0V R 0V 1.5k R75 1.21k R78 RIGHT MC LEFT MC 2 J1 L 1 J1 3 21 Q14 110 R 56 3 21 Q12 110 R 54 3 21 Q18 51.1 R 64 3 21 Q16 22.1 R 71 1000pF C 42 22.1 R 70 1.5k R77 31 2 Q20 1.5k R76 1000uF C 47 220uF C 51 31 2 Q19 1000uF C 46 220uF C 50 1.5k R74 1.21k R81 31 2 Q28 1.21k R80 31 2 Q27

13、1.21k R79 31 2 Q36 31 2 Q35 475 R85 475 R8422pF C57 1 4 6 7 8 2 3 5 - + U9 1 4 6 7 8 2 3 5 - + U8 .1uF C 62 2.21 R91 .1uF C 61 2.21 R89 2.21 R88 1k R93 1k R92 J4:11 TO TUBE J4:10 J4:9 J4:12 3 21 Q13 1k R 55 1k R 57 3 21 Q11 249 R 65 3 21 Q17 3 21 Q15 1000pF C 43 1000uF C 49 220uF C 53 1000uF C 48 22

14、0uF C 52 31 2 Q21 31 2 Q22 31 2 Q29 31 2 Q30 31 2 Q37 31 2 Q38 2.21k R 87 2.21k R 86 22pF C56 .1uF C 63 2.21 R90 .1uF C 60 MC PH 4.75k R60 4.75k R69 4.75k R58 4.75k R67 MC OUT MC OUT 1000pF C 45 22.1 R 73 1000pF C 44 31 2 Q24 100pF C 41 31 2 Q23 4.75k R59 4.75k R66 10uF C 59 31 2 Q32 31 2 Q31 J2:2 J

15、2:3 J2:4 J2:1 1k R 53 1k R 52 22.1 R 72 100pF C 40 31 2 Q25 31 2 Q26 4.75k R61 4.75k R68 1000pF C 55 475 R83 1000pF C 54 31 2 Q33 31 2 Q34 10uF C 58 475 R82 -15V -15V -15V -15V 15V 15V 15V 15V MC1MC2 MC3MC4 MC1MC2 MC3MC4 0V 0V 0V 0V 0V 0V 0V 0V 0V0V0V0V0V 0V 0V0V 0V 0V 0V 0V0V0V0V0V .6V.6V .6V.6V.6V

16、 .6V.6V.6V.6V.6V 0V 0V 0V0V 0V 0V 0V 0V 0V 0V 0V 0V 0V 0V 0V 0V 0V 0V .6V .6V.6V .6V .6V .6V.6V.6V.6V.6V 0V 0V 0V 0V 0V 0V 0V0V MAIN 750761 SCH 1 OF 62A RadioFans.CN 收音机爱 好者资料库 1112 MAIN 750761 SCH 2 OF 62B 4A 4A 4A 4A 4A 4A 4A 4A 4A 4A 4A 3A 3A 3A 3A 3A 5V DVD NC GND GND GND GND LEFT- R L R L R L 0

17、V 0V 0V 0V 0V 0V 0V 0V 0V 0V 0V 0V 0V LEFT 0V 0V 0V 0V 5V 0V 0V 0V 0V 0V 0V 5V 0V 0V 0V R L SERVER (REC) GND GND MM MC MC -24v -24v NC 24v 24v 3B 3B 3B 3A 3A 3B 3C 3C 3A 3A 3A 3A 3A J4:6 J4:9 J4:10 J3:1 J3:2 J3:4 J3:5 J3:6 J3:7 J3:9 J3:10 J3:11 J3:12 4A 4A 4A 4A 4A 4A 4A 3A 3A 3A CD AUX CDR GND GND

18、GND GND 100k R11 L L R 0V 0V 20K R35 0V 0V 5V 0V 0V MAIN MM MAIN NC 3B 3B 3A J4:8 J3:3 J3:8 100k R12 CONTROL J9:1 CONTROL J9:2 CONTROL J9:3 J9:4 CONTROL J9:5 RIGHT- J9:11 J9:12 J9:13 J9:14 J9:15 LEFT- LEFT+ J9:18 R MM OUT J4:2 J4:1 J2:1 J1:2 J1:1 5V 5V 5V 5V 5V 0V 0V 0V 0V 0V 0V 0V 0V 10k R13 MM 4 3

19、 CDR L 1 R DVD 2 L TUNER 100pF C24 20K R40 100pF C26 0V 5V 5V INPUT DRIVER CONVERTER 0V 5V DECODER DECODER INPUT DECODER DECODER 0V OUTPUTS R MC OUT L MC OUT TUBE ON TUBE ON TUBE ON TUBE ON TUBE ON J9:6 RIGHT- J9:10 J9:9 J9:8 J9:7 RIGHT+ RIGHT+ LEFT+ J9:17 J9:16 J4:3 J4:4 L MM OUT J2:2 R MM IN L MM

20、IN 0V 0V 0V 0V 100k R2 220pF C1 47pF C2 3 21 Q1 47pF C4 3 21 Q4 100k R3 220pF C3 10k R8 100k R10 47.5k R18 1k R20 47.5k R17 1k R19 0V 2 J6:2 0V INPUTS INPUTS R 1 J12:1 SRVR 1 J11:1 2 CD R 1 J10:1 2 J10:2 AUX 2 J9:2 2 J8:2 1 2 J7:2 1 J7:1 220k 34 R22:2 220k 3 4 R21:2 220k 12 R22:1 10uF C15 220k 12 R2

21、1:1 10uF C13 220k 12 R24:1 10uF C11 10uF C12 220k 12 R26:1 10uF C20 220k 34 R23:2 10uF C10 220k 34 R25:2 10uF C18 10uF C17 2 1 3 4 K6 2 1 3 4 K5 2 1 3 4 K2 10uF C22 10uF C21 40.2k R34 1k R32 40.2k R33 100pF C23 40.2k R31 1k R29 100pF C28 100pF C25 20K R39 5V DRIVER RIGHT CONVERTER 0V 100k R42 .1uF C

22、35 220pF C36 221k R49 221k R48 0V 1 J13:1 10uF C38 TUBE ON 100k R4 3 21 Q2 100k R1 3 21 Q3 100k R9 10k R14 1 J6:1 2 J12:2 2 J11:2 1 J8:1 1 J9:1 220k 34 R24:2 220k 34 R26:2 10uF C14 10uF C16 220k 12 R23:1 220k 12 R25:1 10uF C9 10uF C19 2 1 3 4 K1 2 1 3 4 K3 2 1 3 4 K4 2 1 3 4 K8 221k R27 221k R28 40.

23、2k R30 100pF C27 6 7 8 9 1 2 3 4 514 15 16 17 18 10 11 12 13 GND U1 6 7 8 9 1 2 3 4 514 15 16 17 18 10 11 12 13 GND U2 .1uF C30 .1uF C29 100k R41 2 1 3 5 4 K17 .1uF C31 .1uF C34 2 1 3 5 4 K18 10uF C37 2 J13:2 10uF C39 BALANCED TO UNBALANCED BALANCED TO UNBALANCED 1k R47 1k R43 221 R50 J14:12 J14:8 J

24、14:7 J14:3 J14:2 GP1 390pF C5 100pF C6 3 21 Q5 10k R5 100pF C8 3 21 Q8 390pF C7 10k R6 10k R16 10k R15 20K R36 2 1 3 4 K14 2 1 3 4 K13 2 1 3 4 K10 22uF C32 1k R45 1k R44 J2:5 J2:6 J2:7 J14:9 J14:10 J14:11 J14:5 J14:4 J14:6 J14:1 3 21 Q6 10k R7 3 21 Q7 2 1 3 4 K9 2 1 3 4 K11 2 1 3 4 K12 2 1 3 4 K16 2

25、2uF C33 1k R46 QF 5 QG 6 QD 3 QA 15 QB 1 GND 8 QH 7 SQH 9 OE 13 VCC 16 QC 2 QE 4 LCLK 12 RESET 10 SCLK 11 DATA 14 U6 QF 5 QG 6 QD 3 QA 15 QB 1 GND 8 QH 7 SQH 9 OE 13 VCC 16 QC 2 QE 4 LCLK 12 RESET 10 SCLK 11 DATA 14 U4 221 R51 J2:8 QF 5 QG 6 QD 3 QA 15 QB 1 GND 8 QH 7 SQH 9 OE 13 VCC 16 QC 2 QE 4 LC

26、LK 12 RESET 10 SCLK 11 DATA 14 U5 QF 5 QG 6 QD 3 QA 15 QB 1 GND 8 QH 7 SQH 9 OE 13 VCC 16 QC 2 QE 4 LCLK 12 RESET 10 SCLK 11 DATA 14 U7 J5:18 J5:17 J5:7 J5:6 J5:14 J5:15 J5:16 J5:9 J5:10 J5:11 J5:12 J5:5 J5:1 J5:3 J5:2 J2:12 J2:10 J2:11 J2:9 J4:2 J4:1 J3:2 2 3 1 - + 84 B+ B- U3:1 J5:13 J5:4 J5:8 J3:

27、1 6 5 7 - + U3:2 595CS ACC_ON D/A_CONTROL CD_CONTROL CDR_CONTROL DVD_CONTROL L_MC L_MM LEFT- LEFT- LEFT+ LEFT+ MC_CONTROL MC_CONTROL MM_CONTROL MM_CONTROL PC_SPKR1 PC_SPKR2 POWERON R_MC R_MM RIGHT- RIGHT- RIGHT+ RIGHT+ SCLK SCLK SCLK SCLK SDATA SQH1 TU_CONTROL TUBE_LIGHT TUBE_LIGHT -15V-15V -15V-15V

28、 -15V-15V -15V-15V -15V15V 5V 5V 5V 5V 5V 5V 5V5V 5V 5V 5V 5V 5V 5V 5V 5V 5V 5V 5V 5V 5V 5V 5V 5V 5V -24V 24V LISAUD-LLISAUD-R MONO MUTE SPKR1 SPKR2 MC1 MC2 MC3 MC4 MM1 MM2 MM3 MM4 L_MM R_MM METER_MUTE 5V 5V 5V 5V L_MC R_MC 15V -15V MM3MM4 MM1MM2 MM3MM4 MM1MM2 10uF C161 5V 100k R238 220pF C162 1k R2

29、39 595CS HDPH MUTE 5V 5V 5V TO J33 PIN3 Ext_Lamp_Control TO BALANCED (INPUT) TO TUBETO TUBE (MC) TO TUBE TO TUBE 0V 0V 0V 0V 0V 0V 0V 5V 5V 5V 5V 5V 5V 5V 5V 5V 5V 0V 0V 0V 5V 5V 0V 5V 5V RadioFans.CN 收音机爱 好者资料库 C2300 1314 MAIN 750761 SCH 3 OF 6 2C 0V 0V 0V LEFT 0V 5V 5V 5V 0V -5V 0V 0V LEFT 5V 5V 5

30、V 5V 5V .6V 0V 0V 0V 0V .6V 0V -9dB 0V 0V .6V 0V 0V -15V 15V -5V 5V 0V 0V 47.5k R181 0V 267k R183 0V 5V 0V 267k R185 3CJ6-11 3CJ6-10 3CJ6-9 3CJ6-8 3CJ6-6 3CJ6-5 3CJ6-4 3CJ6-3 J6-1 0V 0V 5V 5V 5V .6V .6V 1M R204 -3dB 1M R207 .6V .6V .6V 1M R215 .6V 267k R218 .6V -9dB .6V 1M R233 267k R182 J16:3 J16:4

31、 J16:8 J16:9 NEGATIVE POSITIVE 10uF C118 .1uF C123 10M R199 DECODER POST ATTENUATOR DRIVER .6V 0V 0V -3dB 0V -6dB DRIVER 0V .6V -9dB DRIVER -9dB DRIVER LEFT POST ATTENUATOR .6V -12dB DRIVER 0V 0V 0V -12dB 267k R172 267k R171 .1uF C113 221 R175 10uF C111 12.1k R177.1uF C116 12.1k R176 220pF C117 1k R

32、180 8.25k R179 47uF C119 47uF C120 10uF C127 10uF C122 267k R184 3CJ6-12 3CJ6-7 150k R190 150k R191 J6-2 -13.7V 12 3 S G D Q54 1k R195 1k R194 1M R200 -13.7V TUBE MUTE 10M R198 .1uF C144 DECODER TUBE MUTE 31 2 Q55 -13.7V 267k R202 10uF C152 47.5k R209 1000pF C149 1000pF C150 10M R205 10uF C151 .6V 1

33、000pF C154 31 2 Q61 1000pF C153 1M R212 31 2 Q60 10M R213 2.21M R221 31 2 Q65 1M R222 31 2 Q64 24.9k R228 1M R225 .6V 31 2 Q68 267k R227 12 3 S G D Q66 16.5k R235 -12dB 1000pF C158 1000pF C157 12 3 S G D Q70 10M R231 10uF C112 10uF C126 J16:1 J16:2 J16:5 J16:6 J16:7 J16:10 J16:11 J16:12 220pF C145 1

34、2 3 S G D Q53 267k R203 10M R206 47.5k R208 10M R214 267k R219 2.21M R220 267k R229 12 3 S G D Q67 24.9k R226 12 3 S G D Q71 10M R232 16.5k R234 RIGHT VOLUME CONTROL BUFFER .1uF C121 RIGHT TUBE MUTE 20K R193 TO TUBE -3dB DRIVER -3dB DRIVER -6dB DRIVER -6dB -12dB DRIVER 5 VOLT REGULATOR 3 1 2 INOUT U

35、23 5 VOLT REGULATOR 2 31 INOUT U22 .1uF C115 BUFFER 2 1 3 4 K26 10uF C114 10k R173 VOLUME CONTROL .1uF C124 10uF C125 VOLUME CONTROL .47uF C147 20K R192 -6dB 33.2k R217 31 2 Q57 31 2 Q56 267k R210 200k R201 12 3 S G D Q58 12 3 S G D Q62 1000pF C156 31 2 Q69 1000pF C155 1M R230 10M R223 10k R174 1k R

36、178 9 10 11 12 13 14 15 16 1 2 3 4 5 6 7 8 ZCEN DATAO DATAI AINR AGNDR AOUTR VA+ VA- AOUTL AGNDL AINL MUTE SCLK VD+ CS DGND U25 12 3 S G D Q59 267k R211 12 3 S G D Q63 33.2k R216 10M R224 RIGHT POST ATTENUATOR 2 3 1 - + 84 B+ B- U24:1 6 5 7 - + U24:2 QF 5 QG 6 QD 3 QA 15 QB 1 GND 8 QH 7 SQH 9 OE 13

37、VCC 16 QC 2 QE 4 LCLK 12 RESET 10 SCLK 11 DATA 14 U27 VOL_CLK VOL_CS VOL_CS VOL_DATA 5V -15V -15V -15V -15V -15V -15V-15V -15V -15V -15V -15V -15V -15V-15V-15V-15V -15V TUBE_ON -15V 15V5V2 -5V2 5V2-5V2 5V2 5V2 -5V2 5V2 5V 5V LISAUD-L LISAUD-R MONO R_OUT L_OUT 5v 21 22 24 25 26 27 28 29 30 31 32 1 2

38、3 4 5 6 7 8 9 10 11 12 13 14 15 1617 18 19 20 23 InA GND SWCA OutA GND Tone_Tr1a Tone_Mi1a Tone_Ba1a Tone_Ba2a NC GND VDDout DATA CLOCK LATCHADR0 ADR1 V- V+ NC NC Ba2b Ba1b Mi2b Mi1b Tr1b GND OutB SWCB GND InB Tone_Mi2a U26 5V2 -5V2 10uF C128 10uF C129 .0022uF C130 .0022uF C131 10uF C132 10uF C133 .

39、1uF C137 4.99k R186 4.99k R187 10uF C134 10uF C135 .1uF C136 100uF C139 100uF C140 TONE_CS VOL_CLK VOL_DATA 220pF C141 1k R189 1kR188 10uF C138 3C 3C 332 R236 7V -7V 332 R237 32 1 INOUT U28 1.5k R197 3 1 2 INOUT U29 1.5k R196 15V -15V 7V -7V 10uF C159 10uF C160 7V -7V -7V -7V -7V 1k R253 1k R254 .1u

40、F C175 .1uF C176 L MAIN 1 GND GND R MAIN 1 GND GND TUNE ON GND L MAIN 2 GND R MAIN 2 GND 0V 0V 0V 0V POSITIVE 7 VOLT REGULATOR NEGATIVE 7 VOLT REGULATOR 0V 0V 0V 0V RadioFans.CN 收音机爱 好者资料库 1516 MAIN 750761 SCH 4 OF 6 2D LEFT 0V 0V R R R L L 0V 0V 0V 0V 0V 5V 5V 5V 5V 0V 0V 0V 0V 0V HDPH GND HDPH GND

41、 1 1 2 5V MUTE MUTE GND 7 7 7 7 7 7 7 7 7 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B 4B J2:2 J2:3 J2:4 J2:8 J2:4 J2:3 J2:2 J2:1 L 22.1k R135 22.1k R134 0V LEFT 5V 5V 0V 0V 0V 0V 0V 0V 0V GND HDPH GND HDPH 5V 2 GND 7 7 7 7 4B 4B 4B 4B 4B J2:1 J2:5 J2:6 J2:7 TO HEADPHONETO BALALANCED PCB (OUTPUTS) 0V RIGHT .

42、1uF C74 .1uF C75 0V 0V 0V 1 OUTPUTS 1 2 MAIN 1k R136 BUFFER 0V INVERTING BUFFER 0V 0V RIGHT HEADPHONE 0V BUFFER HEADPHONE 0V 0V 0V NC NC R HDPH R HDPH L HDPH L HDPH OUTPUT OUTPUT OUTPUT LEFT + LEFT + 0V BUFFER OUTPUT BUFFER OUTPUT 100uF C77 10k R118 100uF C76 2 1 3 4 K19 2 1 3 4 K23 2 1 3 4 K22 100k

43、 R124 100k R123 100k R121 100k R120 10uF C83 0V 10uF C81 0V 10uF C80 0V 10uF C78 MAIN 2 10uF C87 10uF C86 10k R133 10k R132 1k R137 RIGHT 0V 10k R139 LEFT 0V 10k R138 BUFFER 100 R143 100 R142 NC NC OUTPUT RIGHT - RIGHT + RIGHT - RIGHT + LEFT - LEFT - 10k R119 2 1 3 4 K20 2 1 3 4 K24 2 1 3 4 K21 100k

44、 R125 100k R122 10uF C82 10uF C79 221 R127 J21:3 J21:2 J21:10 J21:11 J20:1 J16:18 J16:17 J16:15 J20:5 J16:14 J20:6 J16:13 J16:12 J16:10 J20:10 J16:9 J16:7 J16:4 J20:16 J16:3J16:3 J20:17 J16:2 J16:1 2 3 1 - + 84 B+ B- U13:1 2 J17:2 221 R131 2 J19:2 221 R129 1 J19:1 221 R128 1 J17:1 221 R126 6 5 7 - +

45、 U15:2 INVERTING J21:1 J21:4 J21:7 J21:6 J21:5 J21:8 J21:12 J20:2 J20:3 J16:16 J20:8 J20:7 33.2k R141 J16:11 100uF C91 J20:11 J16:8 J20:13 J20:14 33.2k R140 J16:5 J16:6 100uF C90 J20:18 6 5 7 - + U13:2 2 J18:2 221 R130 1 J18:1 2 3 1 - + 84 B+ B- U15:1 2 3 1 - + 84 B+ B- U14:1 6 5 7 - + U14:2 J20:4 J

46、21:9 J20:12 J20:15 J20:9 L_MAIN L_MAIN LMAIN R_MAIN R_MAIN RMAIN 15V-15V LMAIN L_MAIN R_MAINRMAIN 5V 5V 5V 5V 5V 5V 5V L_OUT R_OUT MUTE MUTE SPKR1SPKR2 SPKR1 SPKR2 R_MAIN L_MAIN 15V -15V 15V -15V 220pF C163 220pF C164 2 1 3 4 K27 2 1 3 4 K28 HDPH MUTE 5V 5V 470uF C165 470uF C166 1k R240 1k R241 221

47、R243 221 R242 .1uF C85 .1uF C84 100uF C168 100uF C167 15V -15V 15HP -15HP -15HP 15HP RadioFans.CN 收音机爱 好者资料库 C2300 1718 MAIN 750761 SCH 5 OF 6 2E 0V 0V 0V 0V 0V .3V -.5V -3.7V 0V 0V 1 1 1 0V 0V 0V .3V -.5V 1 0V 0V LEFT DGND -3.7V LEFT -3.7V -3.7V 4.75k R115 LEFT METER DRIVER LEFT METER RIGHT - RIGHT + LEFT - J22:2 RIGHT LEFT 47uF C66 RIGHT .1uF C64 806 R94 47uF C65 D1 220uF C69 D6 D7 D11 RIGHT D10 D9 D13D12 31 2 Q39 METER DRIVER 4.75k R114 LEFT J23:1 J23:2 LEFT + J22:1 47.5 R95 D8 31 2 Q4