HITACHI Repair Tips

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MakeModelCh:SymptomProblem SolutionSolutionBy:
HitachiTN2166/2146St/by only - HT=90vDry joint IC952 5v reg
HitachiTN2166/2146POWER SUPPLY TRIPSSUSPECT DRY JOINTS ON IC952
HitachiPAL4Frame - foldover after 10 mins.C613 ( 100u f ) o/c.
HitachiNP9AWidth - reduced.R756 o/c.
HitachiNP9ATripping.Q905 ( 2SA673 ) o/c.
HitachiNP9AStandby - stuck in standby mode.Change C919 to 220u F , replace C906/918 , drys on T901/703
HitachiNP9AStandby - going into standby int.4.43Mhz crystal X1401. on memory PCB PC895.
HitachiNP9AStandby - going into standby at switch on.Check C919 if its a 22u f change it to a 220u f.
HitachiNP9ALine - pulling on verticals.CRT conductive earthing , C983 , C907 , IC980.
HitachiNP9ADead - Int dead.DJs
HitachiNP8CQStartup - no startup.Chopper transistor.
HitachiNP8CQStandby - in standby at switch on.BC548 also 4 7uf/22uf electrolytics.
HitachiNP8CQOVER BRIGHT PIC , NO FLYBACK LINES22mfd , 250v SMOOTHING CAP TO RGB OP. STAGES
HitachiNP8CQInt no colour.Try adj R515 , make sure agc control R203 is turned up.
HitachiNP8CQInt colour.One leg og R620 s/c to jumper lead J723.