McIntosh C45 User manual

SERVICE MANUAL
Performance Specifications ................................... 2 - 3
Rear View and Section Location ................................. 4
Block Diagram ...................................................... 5 - 8
Interconnection Diagram .................................... 9 - 10
Main Schematic and PCB .................................. 13 - 26
Display Schematic and PCB ............................... 27 - 32
6 Channel Schematic and PCB .......................... 33 - 36
Tone Schematic and PCB .................................. 37 - 38
Data Schematic and PCB ................................... 39 - 40
Pushbutton Schematic and PCB ........................ 41 - 42
Tuner/RAA1 Schematic and PCB ....................... 43 - 46
Tuner AM/FM Alignment Procedure .................. 47 - 48
Parts List ............................................................ 51 - 60
Exploded View and Parts Lists ........................... 61 - 65
Repacking Instructions ............................................. 67
CONTENTS
AUDIO
CONTROL CENTER
SERIAL NO. XF1001 And Above
Serial Number XF1001 And Above

PERFORMANCE SPECIFICATIONS
FrequencyResponse
+0,-0.5dB from20Hzto20,000Hz
TotalHarmonicDistortion
0.002%maximumfrom20Hzto20,000Hzatrated output
SignalToNoise Ratio
Phono: 86dB below 10mV input (AWeighted)
High Level: 96dB below rated output (AWeighted)
RatedOutputVoltage
2.5V Unbalanced Outputs (Main)
5.0V Balanced Outputs (Main)
MaximumVoltageOutput
8VUnbalanced
16VBalanced
OutputImpedance
250 ohms Unbalanced
500ohms Balanced
InputImpedance
Phono:47k ohms,65pf
High Level: 22k ohms Unbalanced, 50k ohms Balanced
SensitivityforRatedOutput
Phono:4.5mV
HighLevel:450mVUnbalanced,900mVBalanced
MaximumInputSignal
Phono:50mV
HighLevel: 5V Unbalanced, 10VBalanced
VoltageGain
Phono to Tape/VCR Out: 40dB
Phono to Output (Main): 55dB
HighLevel to Tape/VCROut:0dB
High Level to Output (Main): 15dB
ToneControls
BassControl: ±12dB at30Hz
TrebleControl:±12dBat10,000Hz
PowerRequirements
100Volts50/60Hz,35watts
110Volts 50/60Hz, 35 watts
120Volts50/60Hz,35watts
220Volts50/60Hz,35watts
230Volts50/60Hz,35watts
240Volts50/60Hz,35watts
Note: Refer to the rear panel of the C45 for the correct voltage.
OverallDimensions
17-1/2inches (44.45cm)W, 6 inches(15.24cm) H, including
feet,16-1/2 inches (41.91cm)D,including clearance for
knobs and connectors.
Weight
21 pounds (9.53kg) net, 35 pounds (15.88kg) in shipping car-
ton
OPTIONALTM1TUNER
FMTuner
UseableSensitivity
14dBfwhich is1.4uV across75 ohms
50dBQuieting Sensitivity
Mono: 19dBf which is 2.4uV across 75 ohms
Stereo: 35dBf which is 15uV across 75 ohms
SignalToNoise Ratio
Mono:75dB
Stereo:70dB
FrequencyResponse
Mono:+0,-1dBfrom20Hzto15,000Hz
Stereo:+0,-1dB from 20Hz to 15,000Hz
HarmonicDistortion
Mono:0.3%at100Hz,0.3%at1,000Hz,0.3%at10,000Hz
Stereo: 0.45%at100Hz,0.45%at1,000Hzat1000Hz, 0.65% at
10,000Hz
IntermodulationDistortion
Mono:0.25%
Stereo: 0.45%
CaptureRatio
1.2dB
AlternateChannelSelectivity
75dB
SpuriousResponse
100dB
ImageResponse
75dB
RFIntermodulation
65dB
2

3
1. The heavy notes on the schematic denote the primary
signal path.
2. Unless otherwise noted, all voltages indicated on the
schematics are measured under the following conditions:
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. Unless otherwise specified:
a. Resistor values are in ohms.
b. Capacitor values are microfarads (uF).
c. 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.
NOTES
Stereo Separation
45dBat 100Hz
45dBat1,000Hz
35dBat10,000Hz
SCARejection
65dB
AMTuner
Sensitivity
20uV External Antenna Input
SignalToNoise Ratio
48dBat 30% modulation
58dBat 100% modulation
HarmonicDistortion
0.5%maximumat50%modulation
FrequencyResponse
50Hzto6kHzNRSC
AdjacentChannelSelectivity
45dBminimumIHF
ImageRejection
65dBminimumfrom540Hzto1,600kHz
IFRejection
80dBminimum
PERFORMANCE SPECIFICATIONS con’t
C45

4
REAR VIEW
TOPVIEWWITHCOVERREMOVED
SECTION LOCATION

5 6
BLOCK DIAGRAM
C45

7 8
BLOCK DIAGRAM con’t

INTERCONNECT
1
910
C45

NOTES
11 12

13 1514
C45
MAIN 749850 SH 1 OF 5
2A

16 1817
MAIN 749850 SH 2 OF 5
2B

MAIN 749850 SH 3 OF 5
2C
19 20
C45

MAIN 749850 SH 4 OF 5
2D
21 22

MAIN 749850 SH 5 OF 5
2E
23 24
BLU
BLU
RED
RED
8
8
8
8
8
8
8
8
8
8
8
1
1
1
1
1
5V
12V
33V
5V
0V
5V
0V
5V
0V
5V
5V
0V
5V
0V
5V
5V
5V
5V
5V
5V
0V
0V
0V
0V
0V
0V
0V
0V
5V
5V
5V
-24V
5V
0V
5V
5V
-24V
0V
GND
5V
5V
SS
FIL2
FIL1
FIL1
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
3B
3B
3B
3B
3B
3B
3B
3B
3B
3B
3B
3B
3B
3B
J8:18
J8:17
J8:16
J8:15
J8:13
J8:12
J8:11
J8:10
J8:8
J8:7
J8:6
J8:5
J8:3
J8:2
J8:1
8
8
8
8
8
8
33V
5V
5V
0V
0V
5V
5V
5V
0V
0V
5V
INPUT
5V
5V
FIL2
5V
15V
NC
NC
5V
FIL2
6
6
6
3B
3B
3B
3B
3B
3B
3B
3B
3B
J8:14
J8:9
J8:4
TO DATA PCB
TO POWER TRANSFORMER
J3:2
12V
J3:3
33V
J3:4
J3:5
J5:1
J5:3
J5:4
J4:2
J4:3
J4:4
MPX
J4:7
RED/YEL
SDATA
PLLCE
SCLK
TUNER_SS
D5
D7
D10
D13
D9
5V REGULATOR
12V REGULATOR
15V REGULATOR
-24 REGULATOR
12V
DRIVER
INPUT
DRIVER
0V POWERON
TUNER_MUTE
0V
5V TRIGGER_B
0V
5V
0V
5V
0V
5V
5V
1
WHT
GRN/
0V
DECODER
DECODER
DECODER
FIL2
FIL1
FIL
SCLK
TRIGGER_B
15V
4.3V
0V
5V
5V
5V
0V
IR_DATA
0V
SCLK
SQH1
595CE
VOLCE
VOLDA
SDATA
SDATA2
-24V
5V
PLLCE
FIL2
UPDATE
IR MUTE
CONTROL
POWERON
POWERON
TRIGGER B
IR DATA
TRIGGER A
SQH1
595CE
GND
J1:23
PRESENT J1:22
VOLUME
CLOCK
IR MUTE
J1:19
DATA
J1:18
EX DATA
J1:17
IR TO
595 CLOCK
J1:14
SDATA2
J1:13
VFD -24V
J1:12
SCLK
J1:9
J1:8
PLLCE
J1:7
KEYPAD
UPDATE
MPX
J1:4
J1:3
J1:2
NC
J3:1
5V
GND
J3:6
GND
GND
J5:2
TO OPTIONAL TUNER
J4:1
J4:5
J4:6
SS VOLTS
MPX
.047uF
C172
F1
2A
F3
2A
.047uF
C171
10uF
C192
10uF
C193
D8
D6
D14
D12
D15
22uF
C174 D16
D11
1
2
220k
R244:A
8V 5V
3
2
1IN OUT
U22
HS1
2
31 IN OUT
U32
3300uF
C178
3
2
1IN OUT
U24
HS2
-15V REGULATOR
3
1
2IN OUT
U25
1k
R237
D17
3
4
2
1
K34
5V
.1uF
C183
10uF
C186
.1uF
C198
10uF
C199
.1uF
C180
10uF
C184
.1uF
C182
220uF
C187
5V
0V
0V
5V TRIGGER_A
FRONT_6CH
0V
5V
0V
1
1
GRN
GRN
100k
R239
.1uF
C188
CENTER
10uF
C190
220pF
C191
5.9 VAC
FIL1
595CE
TRIGGER_A
0V
5V
VOLCK
595CE
IR_DATA
SCLK
MPX
FIL1
KEYPAD
EXT DATA
GND
SCLK
TUNER
VOLUME CE
J1:20
J1:21
VOLUME
SDATA
J1:15
J1:16
J1:10
J1:11
J1:5
J1:6
J1:1
1
GP2
F2
2A
34
220k
R244:B 3300uF
C179
23
1
IN OUT
U23
3
4
2
1
K35
.1uF
C181
10uF
C185
POWER TRANSFORMER
.1uF
C189
TO DISPLAY
J23:4
J23:3
PLL DATA
RIGHT
LEFT
J22:1
TUN
SCLK
J21:5
MUTE TUNER_MUTE
15V
J18
J17
J16
08/06/02 res
129466 049850 6CH_SEL
P1169 C45 MAIN (PS)
6CH2_CONTROL
6CH1_CONTROL
5V
R_2CH
L_2CH
2CH_SUB
BAL_CONTROL_6CH
BAL_CONTROL_2CH
TONE_BYPASS
TAPE1_OUT
TAPE_CONTROL
SAT_CONTROL
DVD_CONTROL
CD_CONTROL
PH/AUX_CONTROL
15V
-15V
SQH1
5V
1k
R240
SDATA2
J7:2
J7:3
J7:7
J7:8
POWERON
J7:12
J7:13
J7:17
J7:18
J6:1
TUNER_PRESENT
EXT SENSOR
J6:6
DATA PORTS
J6:11
SCAN STOP
J6:16
SCAN_STOP
J6:21
J23:6
J23:2
J23:1
J22:3
J22:2
J22:4
JMP1
PRESENT
PLL CE
J21:6
J21:4
J21:7
TUNER_PRESENT
SCAN STOP
J21:1
J21:2
SCAN_STOP
J20
J19
47uF
C173
470uF
C176 47uF
C175
rev 05/21/03 res
SUB_MUTE
2CH_CONTROL
6CH_CTL
5V
5V
TAPE2_OUT
INT_TU_CONTROL
PH/AUX_SEL
VCR_CONTROL
CD2_CONTROL
TU_CONTROL
-24V
1k
R241
IRMUTE
J14
J15
F4
0.4A
D3
J7:4
J7:5
J7:10
J7:9
1k
R243
J7:15
J7:14
J6:4
J6:3
J6:2
J6:5
J6:9
J6:8
J6:7
J6:10
J6:14
J6:12
J6:13
J6:15
TUNER_SS
J6:19
J6:18
J6:17
J6:20
J6:23
J6:22
J23:5
3300uF
C177
J21:3
6
7
8
9
1
2
3
4
5
14
15
16
17
18
10
11
12
13
GND
U26
6
7
8
9
1
2
3
4
5
14
15
16
17
18
10
11
12
13
GND
U27
6
7
8
9
1
2
3
4
514
15
16
17
18
10
11
12
13
GND
U28
6
3
112
11
10
7
5
4
2
15
14
9
13
QF
QG
QD
QA
QB
OE
QH
QC
QE
LCLK
SQH
RESET
SCLK
DATA
U31
6
3
112
11
10
7
5
4
2
15
14
9
13
QF
QG
QD
QA
QB
OE
QH
QC
QE
LCLK
SQH
RESET
SCLK
DATA
U29
6
3
112
11
10
7
5
4
2
15
14
9
13
QF
QG
QD
QA
QB
OE
QH
QC
QE
LCLK
SQH
RESET
SCLK
DATA
U30
4.99k
R245
J12
J7:1
J7:6
1k
R242
J7:11
J7:16
INT_TU_CONTROL
T1
T1
T1
T1
T1
-38V
-22V
22V
C45

25 26
MAIN 749850 PCB
2

DISPLAY 749851 SH 1 OF 2
3A
27 28
C45

29 30
DISPLAY 749851 SH 2 OF 2
3B
J6:2
J6:3
J6:4
J6:7
J6:8
J6:9
2E
2E
2E
2E
2E
2E
2E
2E
2E
2E
2E
2E
2E
2E
SS
5V
5V
5V
0V
0V
5V
5V
0V
5V
5V
5V
5V
5V
0V
5V
0V
GND
GND
5V
C1
C0
R1
R0
R0
7
7
7
7
7
7
7
TO MAIN
J6:1
J6:5
J6:6
2E
2E
2E
2E
2E
2E
2E
2E
2E
0V
5V
0V
5V
5V 5V
5V
0V
5V
10
R4
TRIM
5V
5V 0V
R2
R3
7
7
7
7
7
TO PUSHBUTTON
J6:12
J6:13
J6:14
J6:17
J6:18
J6:19
J6:22
J6:23
TUNER_SS
0V
SCLK
LAMP_ON
SDA
SCL
MPX
5V
WDT
5V
0V
5V LAMP_ON
0V
.1uF
C11
5V
0V
.1uF
C8
5V
5V
5V
5V
5V
5V
0V
5V
5V
0V
5V
ENTER
TONE
5V
IR_EXT
0V
INPUT
129467
CONVERTED DATA
049851
5V
5V
5V
5V
5V
IR_FP
5V
FRONT
0V
0V
5V
5V
J3:7
J3:4
J3:2
J3:1
J3:10
J3:8
J3:6
J6:10
J6:11
J6:16
J6:15
J6:21
J6:20
-24V
5V
10
R8
10uF
C9
3
1
2
Q1
ADCE
5V
DS5
5V
FIL2
10
R12
10uF
C12
IR_FP
WDT
ADCE
SCLK
DS7
DS8
5V
100k
R26
0V
220pF
C14
1k
R16
10k
R3
5V
5V
1
3
2
Y1
12.0MHz
10k
R7
5V
0V
0V
0V
5V
5V
CONTROLLER
DS10
5V
5V
5V
5V
0V
0V
5V
5V
STANDBY/ON
SETUP
BYPASS
IR_FP
0V
SELECT
5V
10
9
8
U4:C
0V
5V
5
46
U4:B
10
98
U8:C
FRONT
PANEL IR
PANEL IR
0V
5V
5V
J3:9
J3:3
J3:11
J3:12
J3:5
100
R18
100
R20
100
R21
100
R19
10uF
C15
7
RST 6
SCL
8
VCC
5
SDA
2RST
3WP
1WDI
4GND
U2
DS3
13
12 11
U8:D
SDATA
TUNER_PRESENT
CLOCK
J1:21 VOLCK
IR MUTE
IRMUTE
VOLUME CE
VOLUME
IR_EXT IR_EXT
DATA PORTS
J1:16 IR_DATA VOLCE
VOLDA
595 CLOCK
595CE IRMUTE
SDATA
SDATA
-24V 595CE
SCLK J1:11 SCLK PLLCE
TUNER_SS
.6V
PLLCE
UPDATE
J1:6 KEYPAD_UPDATE
MPX D4
MPX
FIL2
FIL1 J1:1 FIL1
324
R17
595CE
SDATA
MTGPAD3
MTGPAD2
SCL
SDA
MICROPROCESSOR
ILLUMINATION
08/28/02 res
P1169 C45 Display 2 of 2
VFDA
VFCE
.1uF
C10
IR_DATA
J2:11
J2:5
SIGNAL STRENGTH
A/D CONVERTER
.1uF
C13
TUNER
VOLUME
PRESENT
GND J1:23
J1:22
EXT SENSOR
EX DATA
DATA
IR TO
J1:18
J1:19
J1:17
VOLDA
VOLCE
VOLCK
SDATA2
VFD -24V
J1:13
J1:14
J1:12
SDATA2
SDATA SCAN_STOP
PLLCE
KEYPAD
SCAN STOP
J1:8
J1:9
J1:7
2.21k
R25
DS6
SCAN_STOP
FIL2
FIL1
J1:4
J1:3
J1:2 100
R13
3
4
2
1
K1
324
R23
324
R24
SDATA2
324
R14
SCLK
5V
MTGPAD1
2
3
4
5
6
7
8
9
1
R10
8x22k
47uF
C7
DS9
FRONT PANEL WATCHDOG TIMER / RESET
rev 05/13/03 res
DS4
DS11
DS2
2
13
U4:A
DATA PORT CONTROL
TUNER_PRESENT
VFCL
J2:9
J2:4
J2:10
J2:6
KEYPAD_UPDATE
J2:12
J2:1
J2:3
J2:2
J2:7
J2:8
J1:20
8
7
6
5
1
2
3
4OUT
CLK
I/O
-
+
Vcc
GND
REF
IN
ALG
REF
DATA
CS
U6
TREBLE
BASS
TONE
J3
J1:15
J1:10
J1:5
324
R15
6
3
1
12
11
10
7
5
4
2
15
14
9
13
QF
QG
QD
QA
QB
OE
QH
QC
QE
LCLK
SQH
RESET
SCLK
DATA
U5
100
R22
2
3
4
5
6
7
8
9
1
R6
8x22k
66
55
3VOL_B
15V
4GND
2VOL_A
VOLUME
CONTROL
S2
2
13
U8:A
5
46
U8:B
2
3
4
5
6
7
8
9
1
R5
8x10k
13
12 11
U4:D
20 VSS 40
VDD
21
P2.0
19 XT1
23
P2.2
24
P2.3
17 P3.7
16 P3.6
26
P2.5
14 P3.4
28
P2.7
29
PSE
12 P3.2
11 P3.1
31
EA
9RST
33
P0.6
7P1.6
34
P0.5
6P1.5
36
P0.3
4P1.3
38
P0.1
2P1.1
39
P0.0
1P1.0
22
P2.1
25
P2.4
15 P3.5
18 XTO
27
P2.6
30
ALE
32
P0.7
35
P0.4
5P1.4
8P1.7
10 P3.0
13 P3.3
37
P0.2
3P1.2
U3
3
1
2
45
CCW
CW
S1
2
3
4
5
1
R27
4x22k

DISPLAY 749851 PCB
3
31 32
C45

33 34
6 CHANNEL 749852 SCH
4
RS
LS
RF
LF
LS
SUB
RF
LF
5V
5V
5V
5V1
LS
GND
SUB
GND
GND
GND
GND
LF
2A
2A
2A
2A
2A
2A
2A
2A
2A
J1:5
J1:6
J1:7
J1:8
J1:9
J1:10
J1:16
J1:17
J1:18
RF
0V
0V
0V
0V
0V
0V
0V
0V
0V
0V
RS
0V
0V
0V
-15V
0V
0V
0V
0V
0V
0V
0V
LS-
15v
LF-
2B
2B
2B
2B
2B
2B
2B
2B
2B
2B
2B
J10:5
J10:4
J10:3
J10:2
J10:1
SUB
RS
5V
5V2
5V
RS
GND
GND
RF
2A
2A
2A
2A
2A
2A
2A
2A
2A
J1:4
J1:3
J1:2
J1:1
J1:13
J1:12
J1:11
J1:15
J1:14
TO MAIN
RS
LS
SUB
LF
2
3
1
S
-
+
J9
2
3
1
S
-
+
J8
0V
0V
0V
0V
0V
0V
0V
10uF
C24
10uF
C23
10uF
C22
LF
LS
15V -15V
0V
0V
5V
5V
0V
0V
0V
2B
2B
2B
2B
2B
2B
2B
J10:9
J10:7
J10:8
10:6
2
3
1
S
-
+
J7
2
3
1
S
-
+
J6
2
3
1
S
-
+
J11
2
3
1
S
-
+
J5
2
3
1
S
-
+
J12
10uF
C21
D1
100k
R30
TO MAIN
2
3
1
S
-
+
J10
6 CHANNEL 2
INPUTS
6 CHANNEL 1
0V
0V
0V
0V
0V
0V
0V
0V
0V
5V
5V
5V
5V2
5V
FRONT 2 2CH
FRONT 1 2CH
5V
5V
5V
SUB_MUTE
0V
0V
0V
0V
6CHIN2
6CH IN 1
FRONT
6CH
CENTER
CENTER
5V
221
R12
221
R11
5V
5V
SUB_MUTE
20K
R35
- BALANCED AMP
0V
CENTER
20K
R31
0V
0V
0V
0V
0V
0V
0V
0V
-15V15V
2CH
6CH
LS+
-15v
SUB+
GNDB
RF+
LF+
J10:17
J10:16
J10:15
J10:14
J10:13
J10:12
10uF
C11
10uF
C12
6
J2:D
5
J2:C
10uF
C9
10uF
C10
3
J2:B
2
J2:A
0V
0V
10uF
C7
10uF
C8
11
J1:G
12
J1:H
0V
10uF
C5
6
J1:D
8
J1:E
10uF
C3
10uF
C2
3
J1:B
1
2
220k
R6:A
34
220k
R6:B
1
2
220k
R5:A
1
2
220k
R3:A
34
220k
R3:B
1
2
220k
R2:A
34
220k
R2:B
34
220k
R1:B
1
2
220k
R1:A
3
4
2
1K6
6CH2
3
4
2
1K5
3
4
2
1K4
6CH1
3
4
2
1K12
D3
5V
3
4
2
1K11
3
4
2
1K10
D2
3
4
2
1K8
3
4
2
1K7
5V1
5V
DRIVER
DRIVER
10k
R43
10k
R45
5V
6CH1
6CH2
5V
0V
0V
SUB MUTE
33.2k
R24
221
R17
221
R18
33.2k
R23
221
R16
33.2k
R22
221
R13
221
R46
221
R44
221
R9
221
R10
221
R49
221
R47
221
R8
221
R7
3
4
2
1
K18
3
4
2
1
K17
D5
D4
22uF
C30
100k
R29
22uF
C29
100k
R28
22uF
C26
22uF
C27
22uF
C25
- BALANCED AMP
- BALANCED AMP
20K
R34
SUB
20K
R32
- BALANCED AMP
20K
R33
RF
0V
0V
.1uF
C31
0V
0V
0V
.1uF
C34
.1uF
C35
.1uF
C36
GND
RS-
FRONT
SELECT
RS+
CENTER-
SUB-
CENTER+
RF-
J10:18
J10:10
J10:11
10uF
C6
9
J1:F
10uF
C4
10uF
C1
5
J1:C
2
J1:A
34
220k
R5:B
34
220k
R4:B
1
2
220k
R4:A
3
4
2
1K3
3
4
2
1K2
3
4
2
1K1
3
4
2
1K9
33.2k
R21
221
R14
221
R15
33.2k
R19
33.2k
R20
3
4
2
1
K15
3
4
2
1
K13
3
4
2
1
K14
100k
R26
22uF
C28
100k
R25
100k
R27
CENTER
5V
5V
5V
- BALANCED AMP
20K
R42
15V
20K
R40 J4:5
J4:6
J4:16
J4:17
20K
R39
CENTER
5V2
5V1
10uF
C19
OUTPUTS
10uF
C18
10uF
C17
10uF
C38
10uF
C37
10uF
C16
10uF
C15
10uF
C40
10uF
C39
10uF
C14
10uF
C13
20K
R36
6
5
7
-
+
U3:B
2
3
1
-
+
U3:A
- BALANCED AMP
20K
R41
J4:1
J4:3
J4:4
.1uF
C32
J4:7
J4:8
J4:9
J4:10
-15V
J4:11
J4:12
J4:13
J4:14
15V
J4:18
.1uF
C33
1
3
2
Q2
1
3
2
Q1
10uF
C20
3
4
2
1
K16
6
5
7
-
+
U2:B
2
3
1
-
+
U2:A
2
3
1
-
+
U1:A
6
5
7
-
+
U1:B
20K
R38
J4:2
J4:15
20K
R37
J3:12
J3:2
J3:1
J3:18
J3:15
J3:17
J3:16
J3:11
J3:13
J3:8
J3:9
J3:7
J3:4
J3:5
J3:3
J3:14
J3:10
J3:6

6 CHANNEL 749852 PCB
4
35 36
C45

37 38
TONE 749853 SCH and PCB
5
0V
0V
0V
5V
5V
0V
2B
2B
2B
2B
2B
J11:9
0V
0V
5V
47uF
C10
47uF
C11
0V
0V
2B
2B
BASS
0V
.1uF
C26
15V
.1uF
C25
-15V
TREBLE
40.2k
R14
0V
3.32k
R17
0V
-15V
0V
0V
5V
0V
BYPASS
J11:13
RTO J11:14
GND
J11:17
J11:18
RFROM
J11:10
2B
15V
5V 2B J11:8
J11:11
2B
GND
2B J11:1
LTO
2B J11:2
LTO
GND
J11:5
2B
J11:62B
L FROM
22uF
C1 .033uF C3
22uF
C2
3
4
1
2
CCW
R6:A
100k
7
8
5
6
CCW
R6:B
100k
3
4
2
1
K4
5V
475
R7
3
4
2
1
K1
475
R8
3
4
2
1
K3
475k
R11
475k
R12
40.2k
R13
.22uF
C13
.22uF
C14
470pF
C16
0V
6
5
7
-
+
U1:B
100pF
C17
0V
100pF
C18
3.32k
R18
15V
0V
10uF
C24
10uF
C23
10
R23
10
R24
0V
RTO
J11:15
GND J11:16
RFROM
2B J11:12
-15V
J11:7
2B
GND
J11:3
2B
J11:4
2B
GND
L FROM
TO MAIN
3
4
2
1
K2
475k
R10 475k
R9
470pF
C15
2
3
1
-
+
U1:A
681
R3
J1:10
J1:5
J1:1
J1:18
J1:13
681
R2
3
4
1
2
CCW
R1:A
100k
7
6
5
-
+
U2:B
.033uF
C4
100k
R5
7
8
5
6
CCW
R1:B
100k
47uF
C12
.033uF
C5 .22uF
C7
47uF
C9
.033uF
C6 .22uF
C8
100k
R16
J1:6
3.32k
R20
J1:3
10
R19
J1:2
.1uF
C22 .1uF
C21
J1:7
J1:11
J1:12
3.32k
R22
J1:8
J1:16
J1:15
10
R21
J1:14
100k
R4
1
2
3
-
+
U2:A
100k
R15
J1:4
J1:9
J1:17