McIntosh MAC1500 - SERVICE 1 User Manual

MAC 1500 STEREO RECEIVERWARRANTY STATIONSERVICE MANUALCONTENTSMcINTOSH AUDIO COMPANY2 Chambers St., Binghamton, N.Y. 13903MAC 1500INTRODUCTION 1FM ALI

MAC 1500 PARTS LISTTUBESITEMNO.V-1V-2V-3V-4V-5V-6V-7v-8V-9V-10V-11V-12V-13V-14V-15ITEMNO.Q-1Q-20-3Q-4Q-5Q-6Q-7Q-8Q-9Q-10Q-11Q-12Q-13Q-14Q-150-16Q-17Q-

CONTROLSITEMNO.R-1R-2R-3R-4R-5R-6R-7R-8R-9R-10R-11R-12R-55FUNCTIONBalance ControlBass ControlTreble ControlVolume ControlMuting Adjust ControlDriver B

CAPACITORSHEMNO.C-31C-32C-33C-34C-35C-36C-37C-38C-40C-41C-42C-43C-44C-45C-46C-47C-48C-49C-50C-51C-52C-53C-54C-55C-56C-57C-58C-59C-60C-61C-62C-63C-64C-

CAPACITORSITEMNO,C-114C-115C-116C-117C-118C-119C-120C-121C-122C-123C-124C-125C-126C-127C-128C-129C-130C-131C-132C-133C-134C-135ITEMNO.L-1L-2L-3L-4L-5L

RESISTORSITEMNO.R-36R-37R-38R-39R-40H-41R-42R-43R-44R-45R-46R-47R-48R-49R-50R-S1R-52R-53R-54R-60R-61R-62R-63R-64R-65R-66R-67R-68R-69R-70R-71R-72R-73R-

RESISTORSITEMNO.R-124R-125R-126R-127R-128R-129R-130H-131R-132R-133R-134R-135R-136R-137R-J3SR-139R-140R-141R-142R-143R-144R-145R-146R-147R-148R-149R-15

MAC 1500 TOP and BOTTOM VIEWSV 15 V 14 V13 BIAS ADJUSTCONTROLS V12 V3 V4OUTPUTTRANSFORMERSPOWERTRANSFORMERMIXERLEFT AND RIGHTPRE AMP PRINTEDCIRCUIT BO

SPECIFICATIONSFM TUNER SECTION:USABLE SENSITIVITY lot 100% modulation): 2.5uV(I.H.F. Standards)SIGNAL TO NOISE AND HUM RATIO: 65db.HARMONIC DISTORTION

MclNTOSH AUDIO COMPANY2 Chambers St., Binghamton, N.Y. 13903Made In U.S.A.Phong—Area Code 607-723-5491Design subject to change without notice.Printed

MAC 1500 STEREO RECEIVERINTRODUCTIONAll Mclntosh tuners are carefully aligned and tested at the factory using the finestavailable test equipment. All

MAC 1500STEPS12345678910112TUNERDIALSETTINGPoint of nointerferenceand no signalSAMESAME105MC90MC105MC90MC90MC105MC and90MC90MC90MCSIGNAL GENERATORFREQ

FM ALIGNMENTADJUSTTop (secondary)and bottom(primary) ofT1.T2, T3Primary andsecondary ofT4Secondary(top) ofT-5-4L-4C-2, C-3L-1, L-2, L3Primary (bottom)

MAC 15 00 MULTIPLEXSTEPS12345678TUNERDIALSETTINGPoint of nointerferenceor signalSAME100MCSAMESAMESAMESAMESAMESIGNAL GENERATORFREQ.Audio gener-ator set

DECODER ALIGNMENTADJUST67KC Trap (L-6)T-6 top andbottom;L-5T-7 bottom coreT-7 top coreL-5MPX light adjustcontrol R-12TESTLIMITSAdjust for mini-mum vol

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PREAMP/AMPTESTS AND ADJUSTMENTSAll adjustments should be made after a minimum of a10 minute warm-up.1 Remove the 12AX7 (V-9).2 Measure the voltage at