Kenwood RXD-M31 Service Manual

Also see for LS-M31: Service manual

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Kenwood RXD-M31 Service Manual Manual pdf 8 page image

RXD-M31(b)(a) Laser PowerPickup0.05~0.15 mWOptical power meterRF signal in test mode (PLAY).Perform the tangential and focusing offset are focusedinto one point on the display. The crossing points aboveand below the center shall also be looked clearly.No.12ITEMLASERPOWERFOCUSERRORBIASINPUTSETTING–Test discType 4OUTPUTSETTINGConnect an oscilloscopeas follows.(+)side: RF(IC201,17pin)GND: VREF(test pin)Set the senor section ofthe optical power meteron the pickup lens.PLAYERSETTINGPress the "PLAY"key to check thatthe display is "03".Press the "PLAY"key. Confirm thatthe display is "05".ALIGNMENTPOINTVR201–ALIGN FOROn the powerfrom.0.05 to0.15mw. when thediffraction grating iscorrectly alignedwith the RF level of0.8Vp-p or moreOptimum eye patternFIG.(a)(b)Note:Type 4disc :SONY YEDS-18 Test Disc or equivalent.LPF : Around 47kΩ + 390pF or so.Adjustment of CD playerTEST MODE : While pressing the [CD PLAY] key, plug the AC power cord into the AC outlet.RF signal : AC coupledNo.1ITEMTUNEDLEVELINPUTSETTINGOUTPUTSETTINGTUNERSETTINGALIGNMENTPOINT–ALIGN FOR FIG.Adjustment of tuner(A)98MHz,31.2dBf (ANT INPUT)1kHz, ±40kHz DEVAdjust VR1 and stopat the point whereED1 (TUNED)goes ON.VR101MONO 98.0MHzFM300WFM75WAMGNDDIGITALOUTOPTICALANTENNAAUX INPUTAC 110–120V AC 220–240VSPEAKERS(6–16Ω)+––+SUPERWOOFERPRE OUTMANUAL AUTOPANELOPEN/CLOSERRLLAG{ (E)(B)Oscilloscope AC voltmeter AC voltmeterFrequency counter(A)(C)(D)Dummy antennaFM-MPX-SGFM-MPX-SG POLAR SGAM-SGMAIN BOARDCN404123PLAY (R)PLAY (L)A. GNDRVS FWDNO. ITEM INPUTSETTING OUTPUTSETTING CASSETTE TAPEDECK SETTING ALIGNMENTPOINTS ALIGN FOR FIG.Unless otherwise specified, set the respective switches as follows: 0dBs = 0.775VTAPE : NORMAL DOLBY : OFFI Cassette mechanism unit (Adjustment of the REC / PLAY head)(1) Demagnetizationand cleaning — —Power : OFFDemagnetization,cleaning, PLAYRecordinghead, erasehead, capstanpinch rollerDemagnetize the REC / PLAY headwith the head eraser. Clean the REC/PLAY head, erase head, capstan andpinch roller using a cotton swab slightlydamped with alcohol.(2) Azimuth of theREC / PLAYheadSCC-1727TCC-153MTT-11410kHz, -10dB(B) PLAYAdjust the output to maximum andadjust the azimuth adjustment screwfor the Lissajours waveform pattern ofthe oscilloscope to become close to a45˚ straight ling.II PC board adjustment.(1) BIASCURRENT(E)• Set the AUX input levelto +3dB.• Adjust the AG for theoutput of the deck tobecome -20dB(400Hz/12.5kHz)(B) REC PLAY VR701(L)VR702(R)Record 400Hz and 12.5kHz alternately,and adjust the bias current adjustmentpotentiometer for the playback levels tobecome the same.Adjustment of cassette deck8ADJUSTMENT