McIntosh C-45 Service manual
AUDIO
CONTROL CENTER
SERIAL NO. XF1001 And Above
CONTENTS
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
SERVICE MANUAL
Serial Number XF1001 And Above
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
PERFORMANCE SPECIFICATIONS
Frequency Response
+0, -0.5dB from 20Hz to 20,000Hz
T otal Harmonic Distortion
0.002% maximum from 20Hz to 20,000Hz at rated output
Signal T o Noise Ratio
Phono: 86dB below 10mV input (A W eighted)
High Level: 96dB below rated output (A Weighted)
Rated Output V oltage
2.5V Unbalanced Outputs (Main)
5.0V Balanced Outputs (Main)
Maximum V oltage Output
8V Unbalanced
16V Balanced
Output Impedance
250 ohms Unbalanced
500 ohms Balanced
Input Impedance
Phono: 47k ohms, 65pf
High Level: 22k ohms Unbalanced, 50k ohms Balanced
Overall Dimensions
17-1/2 inches (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 carton
OPTIONAL TM1 TUNER
FM T uner
Useable Sensitivity
14dBf which is 1.4uV across 75 ohms
50dB Quieting Sensitivity
Mono: 19dBf which is 2.4uV across 75 ohms
Stereo: 35dBf which is 15uV across 75 ohms
Signal T o Noise Ratio
Mono: 75dB
Stereo: 70dB
Sensitivity for Rated Output
Phono: 4.5mV
High Level: 450mV Unbalanced, 900mV Balanced
Maximum Input Signal
Phono: 50mV
High Level: 5V Unbalanced, 10V Balanced
V oltage Gain
Phono to T ape/VCR Out: 40dB
Phono to Output (Main): 55dB
High Level to T ape/VCR Out: 0dB
High Level to Output (Main): 15dB
T one Controls
Bass Control: ±12dB at 30Hz
Treble Control: ±12dB at 10,000Hz
Power Requirements
100 Volts 50/60Hz, 35 watts
110 Volts 50/60Hz, 35 watts
120 Volts 50/60Hz, 35 watts
220 Volts 50/60Hz, 35 watts
230 Volts 50/60Hz, 35 watts
240 Volts 50/60Hz, 35 watts
Note: Refer to the rear panel of the C45 for the correct voltage.
Frequency Response
Mono: +0, -1dB from 20Hz to 15,000Hz
Stereo: +0, -1dB from 20Hz to 15,000Hz
Harmonic Distortion
Mono: 0.3% at 100Hz, 0.3% at 1,000Hz, 0.3% at 10,000Hz
Stereo: 0.45% at 100Hz, 0.45% at 1,000Hz at 1000Hz, 0.65% at
10,000Hz
Intermodulation Distortion
Mono: 0.25%
Stereo: 0.45%
Capture Ratio
1.2dB
Alternate Channel Selectivity
75dB
Spurious Response
100dB
Image Response
75dB
RF Intermodulation
65dB
2
PERFORMANCE SPECIFICATIONS con’t
C45
Ster eo Separation
45dB at 100Hz
45dB at 1,000Hz
35dB at 10,000Hz
SCA Rejection
65dB
AM T uner
Sensitivity
20uV External Antenna Input
Signal T o Noise Ratio
48dB at 30% modulation
58dB at 100% modulation
Harmonic Distortion
0.5% maximum at 50% modulation
Frequency Response
50Hz to 6kHz NRSC
Adjacent Channel Selectivity
45dB minimum IHF
Image Rejection
65dB minimum from 540Hz to 1,600kHz
IF Rejection
80dB minimum
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).
NOTES
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 recommended by the manufacturer.
3
SECTION LOCATION
TOP VIEW WITH COVER REMOVED
REAR VIEW
4
BLOCK DIAGRAM
C45
5 6
BLOCK DIAGRAM con’t
7 8
C45
1
INTERCONNECT
9 10
NOTES
11 12
C45
2A
MAIN 749850 SH 1 OF 5
13 1514
2B
MAIN 749850 SH 2 OF 5
16 1817
C45
2C
MAIN 749850 SH 3 OF 5
19 20
2D
MAIN 749850 SH 4 OF 5
21 22
C45
2E
MAIN 749850 SH 5 OF 5
C174
22uF
D11
C173
47uF
D12
T1
T1
T1
T1
TO POWER TRANSFORMER
T1
J4:7
J4:6
J4:5
J4:4
J4:3
J4:2
J4:1
J5:4
J5:3
J5:2
J5:1
TO OPTIONAL TUNER
J3:6
J3:5
J3:4
J3:3
J3:2
J3:1
RED
1
RED
1
RED/YEL
1
BLU
1
BLU
1
SS VOLTS
8
SCAN STOP
8
MPX
8
MUTE
8
SCLK
8
PLL CE
8
TUN
PRESENT
8
LEFT
8
GND
8
GND
8
RIGHT
8
GND
8
PLL DATA
8
33V
8
12V
8
5V
8
NC
8
GP2
1
J16
J17
J18
J19
J20
J21:1
J21:2
J21:3
J21:4
J21:5
J21:6
J21:7
J22:1
J22:2
J22:3
J22:4
J23:1
J23:2
J23:3
J23:4
J23:5
J23:6
F2
2A
C171
.047uF
F3
2A
F1
2A
C172
.047uF
TUNER_SS
SCAN_STOP
MPX
TUNER_MUTE
SCLK
PLLCE
TUNER_PRESENT
JMP1
SDATA
33V
12V
5V
D9
D13
D10
D14
D7
D5
D6
D8
D16
D15
C192
10uF
C193
10uF
47uF
C175
-24 REGULATOR
-38V
C176
470uF
-22V
C178
3300uF
22V
C179
3300uF
15V
8V
C177
3300uF
R244:B
R237
1k
U25
2
IN OUT
1
-15V REGULATOR
U23
23
IN OUT
1
15V REGULATOR
U24
1
IN OUT
2
12V REGULATOR
U32
IN OUT
2
5V REGULATOR
U22
1
IN OUT
2
1
220k
R244:A
2
4
INT_TU_CONTROL
220k
3
P1169 C45 MAIN (PS)
rev 05/21/03 res
D17
HS2
3
3
31
HS1
3
5V
129466 049850
08/06/02 res
1
2
C182
C180
C181
C198
.1uF
.1uF
.1uF
.1uF
C183
1
K34
2
.1uF
33V
K35
C187
C184
C185
C199
4
3
220uF
10uF
10uF
10uF
10uF
C186
4
3
L_2CH
5V
5V
-24V
-15V
15V
12V
5V
R_2CH
PH/AUX_CONTROL
TU_CONTROL
CD_CONTROL
CD2_CONTROL
DVD_CONTROL
SAT_CONTROL
TAPE_CONTROL
VCR_CONTROL
TAPE1_OUT
TAPE2_OUT
TONE_BYPASS
PH/AUX_SEL
BAL_CONTROL_2CH
BAL_CONTROL_6CH
INT_TU_CONTROL
2CH_SUB
5V
2CH_CONTROL
6CH1_CONTROL
6CH2_CONTROL
SUB_MUTE
6CH_CTL
6CH_SEL
FIL1
FIL1
FIL2
MPX
PLLCE
SCAN_STOP
TUNER_SS
SCLK
-24V
SDATA2
GRN/
1
WHT
GRN
1
POWER TRANSFORMER
GRN
1
FIL
CENTER
FIL1
FIL2
J12
J14
J15
F4
0.4A
FIL1
5.9 VAC
FIL2
-24V
D3
R245
4.99k
SDATA
595CE
IR_DATA
DECODER
U29
14
SDATA2
11
10
5V
9
12
0V
13
5V
.1uF
C188
14
11
10
5V
9
12
13
0V
100k
R239
15
1
2
3
4
5
6
7
15
1
2
3
4
5
6
7
QA
QB
QC
QD
QE
QF
QG
QH
INPUT
DECODER
U30
QA
QB
QC
QD
QE
QF
QG
QH
DATA
SCLK
RESET
SQH
LCLK
DATA
SCLK
RESET
SQH
LCLK
OE
OE
INPUT
DRIVER
U27
18
5V
17
0V
16
5V
15
5V
14
5V
13
5V
12
5V
11
5V
10
5V
DRIVER
18
0V
17
0V
16
0V
15
5V
5V
13
5V
12
5V
11
5V
10
U28
GND
GND
1
0V
2
5V
3
0V
4
0V
5
0V
6
0V
7
0V
8
0V
9
1
5V
2
5V
3
5V
4
0V
514
0V
6
5V
7
0V
8
0V
9
C191
C190
10uF
220pF
5V
R240
1k
R241
1k
SCLK
595CE
IRMUTE
TRIGGER_A
TRIGGER_B
VOLDA
VOLCE
VOLCK
TUNER_PRESENT
595CE
SQH1
SCLK
R242
1k
IR_DATA
R243
1k
POWERON
15
1
2
3
4
5
6
7
DECODER
QA
QB
QC
QD
QE
QF
QG
QH
U31
RESET
DATA
SCLK
SQH
LCLK
14
11
10
5V
9
SQH1
12
13
0V
OE
5V
5V
C189
.1uF
15V
FRONT_6CH
U26
GND
1
5V
2
0V
3
0V
4
5V
5
5V
6
0V
7
0V
8
0V
9
TRIGGER_A
TRIGGER_B
TUNER_MUTE
POWERON
0V
18
5V
17
5V
16
0V
15
0V
14
5V
13
5V
12
0V
11
5V
10
J6:23
J6:22
J6:21
J6:20
J6:19
KEYPAD
J6:18
J6:17
J6:16
J6:15
UPDATE
PLLCE
SCAN STOP
0V
5V
5V
J6:14
J6:13
J6:12
J6:11
J6:10
J6:9
J6:8
J6:7
J6:6
J6:5
J6:4
J6:3
J6:2
J6:1
J7:18
VFD -24V
SDATA2
SDATA
595 CLOCK
IR TO
DATA PORTS
EX DATA
VOLUME
DATA
VOLUME CE
EXT SENSOR
IR MUTE
VOLUME
CLOCK
TUNER
PRESENT
595CE
-24V
5V
5V
0V
J7:17
J7:16
TRIGGER A
0V
J7:15
IR DATA
J7:14
TRIGGER B
0V
J7:13
J7:12
J7:11
J7:10
J7:9
J7:8
J7:7
J7:6
J7:5
J7:4
J7:3
J7:2
POWERON
POWERON
IR MUTE
CONTROL
KEYPAD
UPDATE
EXT DATA
5V
5V
5V
5V
0V
0V
4.3V
J7:1
FIL1
FIL2
FIL2
MPX
5V
SS
SCLK
GND
SQH1
SCLK
NC
NC
5V
5V
GND
GND
15V
J1:1
3B
3B
J1:2
3B
J1:3
J1:4
3B
3B
J1:5
3B
J1:6
3B
J1:7
3B
J1:8
3B
J1:9
3B
J1:10
3B
J1:11
3B
J1:12
3B
3B
3B
3B
3B
3B
3B
3B
3B
3B
3B
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
J1:13
J1:14
J1:15
J1:16
J1:17
J1:18
J1:19
J1:20
J1:21
J1:22
J1:23
J8:1
J8:2
J8:3
J8:4
J8:5
J8:6
J8:7
J8:8
J8:9
J8:10
J8:11
J8:12
J8:13
J8:14
J8:15
J8:16
J8:17
J8:18
TO DISPLAY
TO DATA PCB
23 24
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