McIntosh MX134 User manual

SERVICE MANUAL
Performance Specifications ................................... 2 - 3
Notes ......................................................................... 3
Rear Panel .................................................................. 4
Section Location ........................................................ 4
Block Diagram ...................................................... 5 - 8
Interconnection Diagram .................................... 9 - 11
Display Schematic and PCB ............................... 12 - 19
Surround Schematic and PCB ............................ 19 - 34
Data Schematic and PCB ....................... 35, 36, 39 - 41
S-Video Schematic and PCB .............................. 42 - 47
Video Schematic and PCB ................................. 48 - 50
Input Lamp Schematic and PCB ........................ 51 - 56
Component Video Schematic and PCB ............ 57 - 60
Tuner AM/FM Alignment Procedure ................. 61 - 62
Tuner/RAA1 Schematic and PCB ....................... 63 - 66
Parts List ............................................................ 67 - 72
Exploded Views and Parts Lists .......................... 73 - 75
Repacking Instruction .............................................. 77
CONTENTS
A/V CONTROL CENTER

PERFORMANCE SPECIFICATIONS
FMTuner
UseableSensitivity
14dBF which is 1.4uV across 75 ohms
50dBQuieting Sensitivity
Mono: 19dBF which is 2.4uV across 75 ohms
Stereo: 35dBF which is 15uV across 75 ohms
SignalTo Noise Ratio
Mono:75dB
Stereo:70dB
FrequencyResponse
Mono:+0,-1dB from 20to 15,000Hz
Stereo:+0,-1dBfrom 20to15,000Hz
HarmonicDistortion
Mono:0.3%at 100Hz, 0.3%at1,000Hz, 0.3% at10,000Hz
Stereo:0.45%at100Hz,0.45% at 1,000Hz,0.65%at10,000Hz
IntermodulatonDistortion
Mono:0.25%
Stereo:0.45%
CaptureRatio
1.2dB
AlternateChannelSelectivity
75dB
SpuriousResponse
100dB
ImageResponse
75dB
RFIntermodulation
65dB
StereoSeparation
45dBat100Hz,45dBat1,000Hz,35dBat10,000Hz
SCARejection
65dB
AMTuner
Sensitivity
20uV external antenna input
SignalTo Noise Ratio
48dBat 30% modulation
58dBat 100% modulation
HarmonicDistortion
0.5%maximumat50% modulation
FrequencyResponse
50Hzto6kHzNRSC
AdjacentChannelSelectivity
45dBminimumIHF
ImageRejection
65dBminimumfrom540to1600kHz
IFRejection
80dBminimum
Audio
FrequencyResponse
Stereo: LeftandRight Smallspeakers: 80Hz-20,000Hz
Subwoofer:20Hz-80Hz
Leftand Right Large speakers: 20Hz-20,000Hz
Subwoofer:OFF
Pro-Logic II: (Movie Processing Mode)
Left,Center,Right, Small speakers:80Hz-20,000Hz
SurroundSmall speakers: 80Hz-7kHz
Subwoofer:20Hz-80Hz
(Music Processing Mode)
Left,Center, Right, Largespeakers: 20Hz-20,000Hz
SurroundLarge speakers: 20Hz-20,000Hz
Subwoofer:OFF
DolbyDigital and DTS:
Left,Center, Right, Largespeakers: 80Hz-20,000Hz
SurroundLarge speakers: 20Hz-20,000Hz
Subwoofer:OFF
Left,Center, Right Largespeakers: 20Hz-20,000Hz
SurroundLarge speakers: 20Hz-20,000Hz
Subwoofer:20Hz-80Hz
ExternalInput
Left, Center, Right, Left Surround, Right Surround:
20Hz-20,000Hz
Subwoofer:20Hz-20kHz(noLP filtering)
RatedOutput
AllModes: 2.0Vrmsfor full bit digital input
InputImpedance
22kohms
2

3
1. The heavy lines 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.ACinputat120volts,50/60Hz.
b. All voltages are +/-10% with respect to ground. A
high impedance (10 megaohm) voltmeter must be used.
4. On PC board drawings, Square pad indicates:
a.PolarizedCapacitors-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
OutputImpedance
47 ohms at all outputs
MaximumOutputVoltage
9.5Vrms
TotalHarmonicDistortion
0.005% at all outputs
Sensitivity
AnalogInput: 400mV for2.0V output
SignalTo Noise Ratio –AllOutputs
Greater than 90dB un-weighted. Greater than 100dB A
weighted.Greater than98dB CCIR.
MaximumInputSignal
AnalogInput: 6Vrms
VoltageGain
Analog Input to Output: 14Db
FrequencyResponse
+0,-0.5dBfrom20Hzto20,000Hz
ToneControls
+12dB,-12dB fromflat setting
GeneralSpecifications
PowerRequirements
100Volts,50/60Hzat 65watts
110Volts,50/60Hz at65 watts
120Volts, 50/60Hzat 65 watts
220Volts, 50/60Hzat 65 watts
230Volts, 50/60Hzat 65 watts
240Volts, 50/60Hzat 65 watts
NOTE: Refer to the rear panel of the MX134 for the correct
voltage.
OverallDimensions
FrontPanel: 17-1/2 inches (44.5cm) wide,7-5/8 inches
(19.37cm) high. Depth behind front mounting panel is 21
inches (53.3cm) including clearance for connectors. Panel
clearance required in front of mounting panel is 1-1/8 inches
(2.9cm).
Weight
32.5 pounds (14.8kg) net, 51.5 pounds (23.4kg) shipping
weight
PERFORMANCE SPECIFICATIONS con’t
MX134

4
REAR PANEL
SECTION LOCATIONS
TOP VIEW WITH COVER REMOVED

5 6
MX134
BLOCK DIAGRAM

7 8
BLOCK DIAGRAM con’t

91110
INTERCONNECT
MX134
1

12 1413
DISPLAY 049625 SH 1 OF 2
2A
BC

15 1716
DISPLAY 049625 SH 2 0F 2
MX134
2A
BC

18 2019
DISPLAY 049625
CONTROL SECTION
2A
SURROUND 049627 SH 1 OF 6
3
KEYBOARD SECTION
2C
LED SECTION
2B

SURROUND 049627 SH 2 OF 6
3
21 2322
MX134

24 2625
3
SURROUND 049627 SH 3 OF 6

27 28
SURROUND 049627 SECTION 4 OF 6
3MX134

29 30
SURROUND 049710 SH 5 OF 6
3

SURROUND 049627 SH 6 OF 6
3
31 32
MX134

SURROUND 049627
3
33 34

DATA 049622 SH 1 OF 2
4
35 36
MX134

NOTES
37 38

39 4140
DATA 049622 SH 2 OF 2
4MX134

S-VIDEO 049624 SH 1 OF 2
5
42 4443