Kenwood CS-5230 Service Manual

Also see for CS-5230: Instruction manual

FINAL UNIT (X80-1370-0X)26ADJUSTMENTVR4( )V. VoltageVR1FRONT410mV GAINVR2CpTROUBLESHOOTINGWhen operating the CS-5200, be sure to use the proper proce-dure and check all panel settings.A wrong setting cause abnormal operation from even a goodproduct. For example, observation of a waveform with highnoise components is accompanied by jitter. In such a case, thejitter can be corrected by setting the trigger coupling to HFrej.If there is any function which you do not understand, check outby reading the instruction manual.If the operation is abnormal even when the operating procedureis correct, remove the top case and bottom panel.CAUTIONHIGH VOLTAGE PARTS ARE INSIDE THE EQUIP-MENT. THEY ARE EXTREMELY DANGEROUS.Check all PC boards to ensure that there is no unpluggedconnector or soldering defect.Some problems may be corrected by applying correct adjust-ment. For example, if the trace moves up and down when theVertical Variable control is turned, it can be corrected by adjust-ing the Variable balance. For the adjustment methods, read thedescriptions of adjustment procedures.The description in the troubleshooting section use the samecircuit names as those used in the block diagram. Refer to theblock diagram when reading the troubleshooting.First, start with checking the power supply block.Check the voltages at U401 on X74-158.OK (Acceptable): Go to next step.NG (Unacceptable): There is a problem in the power supplyblock. Check the regulator circuita: Incase no spot is displayed on the CRT in the X-Y mode.Check that voltages at pins 1 and 4 of P7 on the X74-1580.OK: Check the voltages at pins 1 and 3 of P5 on the X80-1370.OK: There is a problem in the BLK amp. (Go to b.)NG: There is a problem in the vertical amp. (Go to i.)NG: There is a problem in the horizontal amp. (Go to c.)b: Check if the voltage at JW18 on X74-1580 is correct.OK: There is a problem in the BLK amp.NG: There is a problem in the HIGH Volts converter.c: Short-circuit the bases of Q306 and 0307 on X74-1580.A spot is displayed on the CRT:There is a problem somewhere before the Xamp. (Go to d.)Nothing is displayed on the CRT:Short the collectors of Q310 and Q311.A spot is displayed on the CRT:There is a problem in the MAG amp or R/O SW.Nothing is displayed on the CRT:There is a problem in H-FINAL.d: Short-circuit the collector of Q151 on X74-1580 with thechassis.A spot is displayed on the CRT:There is a problem in the Vertical block.Nothing is displayed on the CRT:There is a problem in the X amp.e:Incasenotraceisdisplayedon theCRTintheAsweepmode.Measure the waveform at pin 12 of U102 on X74-1580.OK:MeasureeverywaveformafterU102tolocatethedéfectiveposition.NG:Measurethe ASWEEPGATE,ASWEEP,ASWEEPSTOP and HOLD OFF waveforms to locate the defec- ~tive position.f: In case no trace is displayed on the CRT in the B sweepmode.Measure the waveform at pin 12 of U105 on X74-1580.OK:MeasureeverywaveformafterU105tolocatethedefectiveposition.NG:MeasuretheBSWEEPGATE,BSWEEP,BSWEEPSTOPandDTPcircuitwaveformstolocatethe defec-tiveposition.g: Intensity is not modulated in ALT sweep mode.Check the waveform at the collector of Q116 on X74-1580.OK: There is a problem in INTEN.NG: There is a problem in the BLK amp.h: Triggering cannot be applied.CheckthewaveformatthecollectorofQ151on theX74-1580.OK:Checkthewaveformatthe collector ofQ158onX74-1580.OK: ThereisaproblemintheSchmittcircuit.NG: ThereisaproblemintheTrig.Coup.NG: There is a problem in the trigger selector.