McIntosh MX-136 Service manual

MX136

A/V CONTROL CENTER

SERIAL NO. XM1001 And Above

CONTENTS

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

SERVICE MANUAL

Serial Number XM1001 And Above

Video Schematic and PCB ................................. 48 - 50

Input 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

HDMI Module ......................................................... 71

HDMI Power Supply ................................................ 72

Parts List ............................................................ 73 - 90

Exploded Views and Parts Lists .......................... 91 - 94

PERFORMANCE SPECIFICATIONS

Audio Specifications

Frequency Response

Left, Center , Right, Left Surround, Right Surround, Left Back, Right Back:

±0.5dB from 20Hz-20,000Hz Subwoofer1:

±0.5dB from 20Hz-140Hz

T otal Harmonic Distortion

0.005% 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

9.5V Unbalanced 19V Balanced

Output Impedance

100 ohms Unbalanced 200 ohms Balanced

General Specifications

Power Requirements

100 Volts, 50/60Hz at 65 watts 110 Volts, 50/60Hz at 65 watts 120 Volts, 50/60Hz at 65 watts 220 Volts, 50/60Hz at 65 watts 230 Volts, 50/60Hz at 65 watts 240 Volts, 50/60Hz at 65 watts

Note: Refer to the rear panel of the MX136 for the correct

voltage.

Overall Dimensions

Width is 17-3/4 inches (45.09cm) Height is 9-7/16 inches (23.97cm) including feet Depth is 18-3/4 inches (47.63cm) including the Front Panel and Knobs

Weight

31 pounds (14.06Kg) net, 55 pounds (24.95Kg) shipping

Shipping Carton Dimensions

Width is 25 inches (63.5cm) Depth is 28 inches (71.12cm) Height is 18-3/8 inches (46.67cm)

FM T uner Specifications

Useable Sensitivity

14dBf which is 1.4uV across 75 ohms

Input Impedance

Phono: 47k Ohms, 65pf High Level: 22k Ohms Unbalanced

50k Ohms Balanced

Sensitivity for Rated Output

Phono: 5mV High Level: 500mV Unbalanced

1V 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): 54dB High Level to T ape/VCR Out: 0d B High Level to Output (Main): 14dB

T one Controls

Bass Control: ±12dB at 30Hz Treble Control: ±12dB at 10,000Hz

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

Frequency Response

Mono: + 0, - 1dB from 20 to 15,000Hz Stereo: + 0, - 1dB from 20 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

0.65% at 10,000Hz

Intermodulation Distortion

Mono 0.25% Stereo 0.45%

PERFORMANCE SPECIFICATIONS con’t

MX136

Capture Ratio

1.2dB

Alternate Channel Selectivity

75dB

Spurious Response

100dB

Image Response

75dB

RF Intermodulation

65dB

Ster eo Separation

45dB at 100Hz 45dB at 1,000Hz 35dB at 10,000Hz

SCA Rejection

65dB

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.

AM T uner Specifications

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