Sanyo M9994K Service Manual

enonectvRiciansTORQUEADJUSTMENTTAPESPEEDADJUSTMENT1.SettheunittothePLAY,FAST.FORWARDorREWINDmode.1.ConnectafrequencycountertotheExt.Speakerjack.2.Measuretheeachtorquewithatorquegauge.Theyshouldbeas2.Mounta3kHztesttapeontheunitandplayitback.Turntlfollowing;potentiometerinsidethemotorandadjustituntilthecounterreaPLAY35—60 g/cmingbecomes2970~3020Hz.FASTFORWARD60—100g/cmREWIND65—100g/cm3.Iftheeachtorquefailstoreachthestandardvalue.CleanthedriveHEADAZIMUTHADJUSTMENTbelt,flywheel,motorpulley,take-upreel, idlerand rewindroller1.Mountamusictape ontheunitforthereproductionoftape.Insewithacottonswabsoakedinalcohol. thescrewdriver(+) toazimuthhole,andturntheazimuthadjusti!screwuntiltothemaximumsound.PINCH ROLLER ADJUSTMENT1. Set the unit the Play mode.2. Apply a tension gauge (500 gr) to the pinch roller and measure thepressure. The gauge reading should be within the range 300 — 400 gr.3. To adjust the contact pressure, bend the spring or change the springwith a new one, if necessary.ADJUSTMENT OF STAND-BY MECHANISM(RESULTANT FORCE OF LOCK-LEVER SYSTEM)The lever of the slide (445) has to be unlocked with the revolving shaftof the pulley (443) kicking it before the stand-by mechanism works.Employ a spring gauge capable of measuring a force of up to 110 g formaking this adjustment.Resultant force of lock-lever system ..... 100g or smallerIn the event that the resultant force is larger than the above specification,adjust by bending or replace the spring coil 331 (141-2-851T-56100).j‘;;ii'a‘44{||::j;4