McIntosh MX135 User manual

SERVICE MANUAL
Performance Specifications ................................... 2 - 3
Notes ......................................................................... 3
Rear Panel .................................................................. 3
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 ................................... 37 - 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
Balanced Schematic and PCB ........................... 67 - 70
Parts List ............................................................ 71 - 90
Exploded Views and Parts Lists .......................... 91 - 94
Repacking Instruction .............................................. 95
CONTENTS
A/V CONTROL CENTER

PERFORMANCE SPECIFICATIONS
Audio
FrequencyResponse
Stereo: Leftand RightSmall speakers:80Hz-20,000Hz
Subwoofer:20Hz-80Hz
Leftand RightLarge speakers:20Hz-20,000Hz
Subwoofer:OFF
Pro-Logic IIx: (Movie Processing Mode)
Left,Center, Right,Smallspeakers: 80Hz-20,000Hz
SurroundSmall speakers:80Hz-20kHz
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,Smallspeakers: 80Hz-20,000Hz
SurroundSmallspeakers:80Hz-20,000Hz
Subwoofer:20Hz-80Hz
Left,Center,RightLargespeakers: 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(no LPfiltering)
RatedOutput
AllModes:2.0Vrmsfor full bit digitalinput
InputImpedance
22kohms
OutputImpedance
47 ohms at all outputs
MaximumOutputVoltage
9.5Vrms
TotalHarmonicDistortion
0.005% at all outputs
Sensitivity
AnalogInput: 400mV for 2.0Voutput
SignalToNoise Ratio –All Outputs
Greater than 90dB un-weighted. Greater than 100dBA
weighted.Greater than 98dBCCIR.
MaximumInputSignal
AnalogInput:6Vrms
VoltageGain
Analog Input to Output: 14dB
FrequencyResponse
+0,-0.5dBfrom20Hzto20,000Hz
ToneControls
+12dB,-12dB from flatsetting
FMTuner(TM1option)
UseableSensitivity
14dBF which is 1.4uV across 75 ohms
50dBQuietingSensitivity
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, -1dBfrom20 to15,000Hz
Stereo:+0,-1dB from20 to15,000Hz
HarmonicDistortion
Mono:0.3%at100Hz,0.3% at1,000Hz,0.3% at10,000Hz
Stereo:0.45%at 100Hz,0.45%at 1,000Hz,0.65%at 10,000Hz
IntermodulatonDistortion
Mono:0.25%
Stereo:0.45%
CaptureRatio
1.2dB
AlternateChannel Selectivity
75dB
SpuriousResponse
100dB
ImageResponse
75dB
RFIntermodulation
65dB
StereoSeparation
45dBat100Hz,45dB at1,000Hz,35dBat 10,000Hz
SCARejection
65dB
2

GeneralSpecifications
PowerRequirements
100Volts,50/60Hz at 65watts
110Volts, 50/60Hzat 65 watts
120Volts,50/60Hz at 65watts
220Volts,50/60Hz at 65watts
230Volts,50/60Hz at 65watts
240Volts,50/60Hz at 65watts
NOTE: Refer to the rear panel of the MX135 for the correct
voltage.
OverallDimensions
FrontPanel: 17-1/2 inches(44.5cm) wide, 9-7/16inches
(23.97cm) high. Depth behind front mounting panel is 19
inches (48.26cm) including clearance for connectors. Panel
clearance required in front of mounting panel is 1-1/8 inches
(2.9cm).
Weight
31.5 pounds (14.3kg) net, 55 pounds (25kg) shipping weight
PERFORMANCE SPECIFICATIONS con’t
MX135
AMTuner(TM1option)
Sensitivity
20uV external antenna input
SignalToNoise Ratio
48dBat 30% modulation
58dBat 100% modulation
HarmonicDistortion
0.5%maximumat 50%modulation
FrequencyResponse
50Hzto6kHzNRSC
AdjacentChannelSelectivity
45dBminimumIHF
ImageRejection
65dBminimumfrom540to1600kHz
IFRejection
80dBminimum
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. 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. On PC board drawings, Square pad indicates:
a. Polarized Capacitors - Positive
b. Diodes - Cathode
c. Others - Pin 1
4. WARNING
Parts marked with the symbol have critical
characteristics. Use only replacement parts recom-
mended by the manufacturer.
NOTES
REAR PANEL
3

4
SECTION LOCATIONS
BOTTOM VIEW WITH COVER REMOVED
TOP VIEW WITH COVER REMOVED

5 6
MX135
BLOCK DIAGRAM

7 8
BLOCK DIAGRAM con’t

91110
INTERCONNECT
MX135
1

12 1413
DISPLAY 050036 SH 1 OF 2
2A
BC

15 1716
DISPLAY 050036 SH 2 0F 2
MX135
2A
BC

18 2019
2A
SURROUND 050037 SH 1 OF 6
3
KEYBOARD SECTION 050053
2C
LED SECTION 050054
2B
DISPLAY CONTROL SECTION 050036

SURROUND 050037 SH 2 OF 6
3
21 2322
MX135

24 2625
3
SURROUND 050037 SH 3 OF 6

27 28
SURROUND 050037 SECTION 4 OF 6
3MX135

29 30
SURROUND 050037 SH 5 OF 6
3

SURROUND 050037 SH 6 OF 6
3
31 32
MX135

SURROUND 050037
3
33 34

NOTES
35 36
MX135

DATA 050033 SH 1 OF 2
4
37 38

39 4140
DATA 050033 SH 2 OF 2
4MX135

S-VIDEO 050035 SH 1 OF 2
5
42 4443