I use the scope when the ESR readings aren't conclusive. Too much ripple will cause that. Al Marquardt [EMAIL PROTECTED] Al Marquardt Electronic Repair 206 W Main Girardville Pa. 17935 ----- Original Message ----- From: "Mark Wentowski" <[EMAIL PROTECTED]> To: "ELECTRONICS PROFESSIONALS LIST" <[EMAIL PROTECTED]> Sent: Saturday, June 19, 2004 9:12 AM Subject: RE: [Techs] TA Admiral GOJ12333. P/S hum in s/b
> Just remember that ESR readings on most supply caps should be extremely low > in "resistance". I use my scope to spot problems but I can't seem to > convince anyone else to do likewise. > > Mark Wentowski > Perry Hill Electronics > 3836 Harrison Rd. > Montgomery AL 36109 > phone: (334)279-5622 > fax: (334)273-9050 > [EMAIL PROTECTED] > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Intrepid Video > Support > Sent: Saturday, June 19, 2004 5:16 AM > To: ELECTRONICS PROFESSIONALS LIST > Subject: Re: [Techs] TA Admiral GOJ12333. P/S hum in s/b > > > Mark, > It kind of sounds like a bad cap. It's coming from the power supply circuit. > I have pressure in my ears, > so it's hard to pin point the location. > The hum starts low and gradually increase in about 5 seconds after set is in > standby. > Jeff > -- > Intrepid Video TV/VCR Repair > 263 S Front St, Steelton PA 17113 > 717-939-7708; (F) 717-564-4952 > www.intrepid-video.com www.tech-repair.net > ----- Original Message ----- > From: "Mark Wentowski" <[EMAIL PROTECTED]> > To: "ELECTRONICS PROFESSIONALS LIST" <[EMAIL PROTECTED]> > Sent: Saturday, June 19, 2004 12:21 AM > Subject: RE: [Techs] TA Admiral GOJ12333. P/S hum in s/b > > > A hum from where? High frequency? Low frequency? The speaker? The power > supply circuit? Does the set operate normally otherwise. From my experience > a high frequency noise from the supply in standby can be caused by a bad > cap. They wont always test bad either but you can spot them with your scope. > But if its a lower frequency "hum" then it may be from the AC line choke. A > little hot glue or silicon glue can cure that. > > I'm guessing Jeff. If anyone has a manual on Admiral I want them to let me > know about it. > > Admiral, Apex,........etc, etc. They never intended for those things to be > repaired. No service support so far as I know but I would be thrilled to be > proven wrong. > > Mark Wentowski > Perry Hill Electronics > 3836 Harrison Rd. > Montgomery AL 36109 > phone: (334)279-5622 > fax: (334)273-9050 > [EMAIL PROTECTED] > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Intrepid Video > Support > Sent: Friday, June 18, 2004 10:33 AM > To: Tech List > Subject: [Techs] TA Admiral GOJ12333. P/S hum in s/b > > > Set came in dead. > Replaced shorted HOT (2SD2627) with NAP 483513048195.. > Set has an Orion CRT and I think the main board is Toshiba...has VMX180C > imprinted on it. > Set will come on now, but in stand by there is a hum. > IC 501 output at 4.4vdc..Input is 6vdc. > It looks like this comes from Q504(2SC1815) This is as far as I got with out > a schematic. > Has anyone seen this before, or have a schematic I can borrow..be faxed or > emailed (of this section)to me? > Thank you. > > Jeff > -- > Intrepid Video TV/VCR Repair > 263 S Front St, Steelton PA 17113 > 717-939-7708; (F) 717-564-4952 > www.intrepid-video.com www.tech-repair.net > > > _______________________________________________ > 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 > > > > _______________________________________________ > 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 > > > > _______________________________________________ > 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 > > > > _______________________________________________ > 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 > > _______________________________________________ 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
