Eugene, thanks for hte tip. I will check it out.& let you know the results. Frank
-- HQ Electronics 218 N 1st St Shelton WA 98584 360-426-3336 (Shared phone and fax) http://www.hqelec.com ----- Original Message ----- From: "Eugene Spooner" <[EMAIL PROTECTED]> To: "ELECTRONICS PROFESSIONALS LIST" <[EMAIL PROTECTED]> Sent: Tuesday, July 13, 2004 12:15 PM Subject: Re: [Techs] Mits vert help needed. > The sweep is linear and not distorted which rules out the > yoke. Think you have a feedback problem back to the Jungle > IC that generates the vert sweep. Generally ; the more > feedback it gets means less drive and smaller pix. So , you > may have a resistor and or capacitor that is off value in > the feedback line from low end of yoke to jungle IC. I have > found the timing capacitor ( vert ramp ) may be off value > and 'times out' before it should have. Don't forget to check > for leaks from capacitors to louse you up - giveaway is > black traces. Last and not least is the infamous "Brown > Glue". HTH > Best: Eugene > > HQ Electronics wrote: > > > > Make: Mitsubishi > > Model: CS3515R > > Sams: 3055 Note- not 100% vert circuit correct for this model. one cap > > shown in sch. missing on bd from factory. Also 30v PS feed shows 12 pins on > > IHVT this one has 10 as near as I can tell. > > Problem: came in with no vertical. > > I now have vert sweep, but it does not fully fill the screen. The top 1.5-2" > > is black with retrace lines below that. > > I used QUALITY parts, all checked before I replaced them, and even subbed > > the known good quality vert IC with another good quality one. (From an > > entirely different source & batch --just in case) > > > > This one has me flummoxed! > > I have replaced the following : > > IC4E1- LA7838 > > C538 [EMAIL PROTECTED] > > C4E2 [EMAIL PROTECTED] > > C4e4 [EMAIL PROTECTED] > > C5J9 [EMAIL PROTECTED] > > C965 [EMAIL PROTECTED] > > C4F3 [EMAIL PROTECTED] > > [EMAIL PROTECTED] > > [EMAIL PROTECTED] > > Q4A1 2SC2234 subbed with 2SC2235 (30 V reg.) > > Note: 30V line to vert solid at 29.5VDC > > > > There are 2 bipolar elect caps that I ESR'd-- OK-- and one cap that shows > > elect in the schematic but is a 1 mfd mylar in the set. > > > > I have repaired several traces the "fish oil" has damaged and double checked > > that I put in the 'lytics with proper polarity. > > The set will slowly lose more vertical the longer its left on, > > predominantly from the top, but does pull up from the bottom too. > > > > What have I missed?? > > (Could this be a yoke problem?) > > > > Thanks! > > Frank > > > > -- > > HQ Electronics > > 218 N 1st St > > Shelton WA 98584 > > 360-426-3336 (Shared phone and fax) > > http://www.hqelec.com > > > > --- > > Outgoing mail is certified Virus Free. > > Checked by AVG anti-virus system (http://www.grisoft.com). > > Version: 6.0.719 / Virus Database: 475 - Release Date: 7/12/2004 > > > > _______________________________________________ > > Tech Repair CD...order your just $49.00 plus shipping...One year of updates free. > > www.intrepid-video.com www.tech-repair.net > > Techs mailing list > > [EMAIL PROTECTED] > > http://intrepid-video.com/mailman/listinfo/techs_intrepid-video.com > > -- > Head Witch Doctor and Chief Bottle Washer > Eugene Spooner , CET , AAS , NP > Eugene's Carry-In TV > 1417 Eastway Drive > Charlotte , NC 28205 > mailto:[EMAIL PROTECTED] > > _______________________________________________ > Tech Repair CD...order your just $49.00 plus shipping...One year of updates free. > www.intrepid-video.com www.tech-repair.net > Techs mailing list > [EMAIL PROTECTED] > http://intrepid-video.com/mailman/listinfo/techs_intrepid-video.com --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.719 / Virus Database: 475 - Release Date: 7/12/2004 _______________________________________________ Tech Repair CD...order your just $49.00 plus shipping...One year of updates free. www.intrepid-video.com www.tech-repair.net Techs mailing list [EMAIL PROTECTED] http://intrepid-video.com/mailman/listinfo/techs_intrepid-video.com
