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McIntosh MAC1500 - SERVICE MANUAL 1 Service Manual

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MAC 1500 STEREO RECEIVER
McINTOSH
AUDIO COMPANY
WARRANTY STATION
SERVICE MANUAL
CONTENTS
1
2-3
6-7
8
8
9-14
15
16
16

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Summary of Contents for McIntosh MAC1500 - SERVICE MANUAL 1

  • Page 1: Table Of Contents

    MAC 1500 STEREO RECEIVER SERVICE MANUAL CONTENTS INTRODUCTION FM ALIGNMENT CHART MULTIPLEX DECODER ALIGNMENT CHART _ 4-5 SCHEMATIC TESTS AND ADJUSTMENTS DIAL STRINGING PARTS LIST 9-14 TOP AND BOTTOM VIEWS SPECIFICATIONS BLOCK DIAGRAM McINTOSH AUDIO COMPANY 2 Chambers St., Binghamton, N.Y. 13903...

  • Page 2: Introduction

    MAC 1500 STEREO RECEIVER I N T R O D U C T I O N All Mclntosh tuners are carefully aligned and tested at the factory using the finest available test equipment. All Mclntosh tuners will meet their published specifica- tions when shipped from the factory.

  • Page 3: Fm Alignment Chart

    MAC 1500 SIGNAL GENERATOR INDICATOR TUNER STEPS DIAL CONNECTED FREQ. MODULATION COUPLING SETTING TYPE Point of no Through external VTVM 10.7MC TP#1 .01 MFD capacitor interference to mixer grid (pin and no signal 4 or 6DS4, V2) SAME SAME SAME SAME SAME Pin 1 of T4...
  • Page 4 FM ALIGNMENT TEST REMARKS ADJUST LIMITS Before making any adjustments, set the controls as follows: a) Input selector switch to FM mono, b) Volume control maximum CCW. c) Muting pot maximum CW. d) Muting OUT. e) Stereo light adjust maximum CW. Maximum pos- Shunt to ground the winding not being adjusted.

  • Page 5: Multiplex Decoder Alignment Chart

    MAC 15 00 MULTIPLEX SIGNAL GENERATOR INDICATOR TUNER STEPS DIAL CONNECTED FREQ. COUPLING MODULATION SETTING TYPE Point of no Audio gener- TP#2 Audio L or R tape output ator set to 67KC interference VTVM 0.5 volts out- or signal put or less MPX generator SAME SAME...
  • Page 6 DECODER ALIGNMENT TEST REMARKS ADJUST LIMITS Stereo light must be on. This is done by adjusting the "MPX Light Adj." Adjust for mini- 67KC Trap (L-6) mum voltage control, R-12. Stereo light must be off. Adjust for maxi- T-6 top and bottom;...

  • Page 9: Tests And Adjustments

    PREAMP/AMP TESTS AND ADJUSTMENTS All adjustments should be made after a minimum of a 10 minute warm-up. Remove the 12AX7 (V-9). Measure the voltage at TP#3. Voltage should be 0.7 volts positive. If it is not 0.7 volts, ad- just R-8. Do likewise with TP#4 and R-9, TP#5 and R-10, TP#6 and R-11.

  • Page 10: Parts List

    MAC 1500 PARTS LIST TUBES ITEM TUBE PART NUMBER NUMBER HF Amplifier 6DS4 165-013 Mixer 6DS4 165-013 1st IF Amplifier 165-004 6AU6 2nd IF Amplifier 6AU6 165-004 3rd IF Amplifier, 1st Limiter 6AU6 1 65-004 4th IF Amplifier, 2nd Limiter 6CS6 165-01 1 19KC Amplifier, Indicator Control...
  • Page 11 CONTROLS ITEM PART FUNCTION RESISTANCE NUMBER Balance Control 500K-500K 134-165 Bass Control 134-117 IM-1M Treble Control 134-118 500K-500K Volume Control 134-164 60K-60K Muting Adjust Control 100K 134-102 Driver Balance Control 134-103 Driver Balance Control 134-103 Bias Adjust Control 134-102 100K Bias Adjust Control 100K 134-102...
  • Page 12 CAPACITORS PART DESCRIPTION CAPACITANCE VOLTAGE TOLERANCE NUMBER Ceramic Disc. 12PF 20% NPO 061-010 C-31 Ceramic Disc. .1MPD +80-20% 061-049 C-32 .005MFD Ceramic Disc. +80-20% 061-040 C-33 Ceramic Disc. .005MFD +80—20% C-34 061-040 .01 MFD Ceramic Disc. +80-20% 061-043 C-35 ±.75PF Ceramic Tubular 15PF C-36...
  • Page 13 CAPACITORS PART ITEM DESCRIPTION CAPACITANCE NUMBER VOLTAGE TOLERANCE Mylar .1MFD C-114 125V 064-028 Mylar .1MFD C-115 125V 064-028 Ceramic Disc. .005MFD C-116 1400V 061-052 .005MFD Ceramic Disc. C-117 1400V 061-052 C-118 .47MFD Mylar 200V 064-020 Electrolytic 60-40MFD C-119 500V-500V 066-026 Electrolytic 40-40-40 MFD 066-032...
  • Page 14 RESISTORS PART ITEM WATTAGE NUMBER TOLERANCE RESISTANCE 136-082 ½W 220 ohms R-36 ¼W 136-382 R-37 ¼W 136-382 R-38 ½W 136-166 22 K R-39 ¼W 136-370 R-40 136-367 2.2K ¼W H-41 ½W 136-110 R-42 ¼W 136-303 R-43 ¼W 136-295 470 ohms R-44 ¼W 1 36-298...
  • Page 15 RESISTORS ITEM PART RESISTANCE TOLERANCE WATTAGE NUMBER R-124 7.5K 136-376 ¼W R-125 4.7K ¼W 136-298 R-126 7.5K 136-376 ¼W R-127 4.7K 1 36-298 ¼W R-128 150 ohms ¼W 136-294 R-129 150 ohms ¼W 136-294 R-130 5.6K 136-397 ¼W H-131 5.6K 136-397 ¼W R-132...

  • Page 16: Top And Bottom Views

    1500 BOTTOM VIEWS V 15 V 14 BIAS ADJUST CONTROLS OUTPUT POWER TRANSFORMERS TRANSFORMER LEFT RIGHT OSCILLATOR COIL TRIMMER COIL 12AU7 (V8) MIXER TRIMMER 6EA8 (V7) LEFT AND RIGHT PRE AMP PRINTED CIRCUIT BOARDS TRIMMER COIL ANTENNA TUNING CONDENSER COVER COIL V14 V15 MUTE ADJUST CONTROL...

  • Page 17: Specifications

    SPECIFICATIONS H.F. Filler, cutoff frequency = 5KC. AMPLIFIER SECTION: FM TUNER SECTION: attenuation rale = 1 2db per octave POWER OUTPUT: 60 watts continuous, 30 watts per USABLE SENSITIVITY lot 100% modulation): 2.5uV channel, 65 watts total music power (I.H.F. Stand- (I.H.F.

  • Page 18: Chambers St., Binghamton, N.y

    MclNTOSH AUDIO COMPANY 2 Chambers St., Binghamton, N.Y. 13903 Made In U.S.A. Phong—Area Code 607-723-5491 Design subject to change without notice. 038-133 BE062003 Printed in U.S.A.

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