Al, thanks for the reply, I checked the 2.2 meg resistor already and it`s good, main fuse strangely enough does not blow, I guess R608 opening saves it, Larry E Larry Eastman American TV & Electronics Crystal River, Fl. 34428 ----- Original Message ----- From: "Al L" <alleathe@xxxxxxxxxxxxx> To: <techassist@xxxxxxxxxxxxx> Sent: Friday, July 15, 2005 3:46 PM Subject: [TechAssist] Re: Sony RA-2A KP-46C65 instantly blows IC601 & R608 > I once had an antenna isolation shorted,ran perfectly on my variac,which was > also an isolation transformer.Hooked up the cable on ac,BAM blown fuse.There > was 120 VAC on the r-f connector!If I had been holding the cable,and touched > the rf.....................!Good luck. > > Al Leatherman > 224 RT. 46 > Mine Hill, NJ 07803 > 973-361-5796 > WWW.ALS-TV.NET > > ----- Original Message ----- > From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxx> > To: <techassist@xxxxxxxxxxxxx> > Sent: Friday, July 15, 2005 3:24 PM > Subject: [TechAssist] Re: Sony RA-2A KP-46C65 instantly blows IC601 & R608 > > > > You made me think that the customer mentioned "that they had lightning > > problems 2 days before set went down". Since it ran on the variac, it > > would > > be doubtful that the problem is in the power supply as they are not very > > forgiving. I am wondering if they may also have an electrical issue at > > their > > home as a result. Is the set at your shop now? > > > > Bob Waterman, CET® #RI-28 > > Master Technician License #9109 > > Service Manager / Parts Manager > > Gemini Computer, TV, & Security Alarms > > (508)695-7302 > > (508)695-7769 FAX > > geminitv@xxxxxxxxxxx > > > > > > ----- Original Message ----- > > From: "Larry E" <videotech@xxxxxxxxxxxx> > > To: <techassist@xxxxxxxxxxxxx> > > Sent: Friday, July 15, 2005 3:12 PM > > Subject: [TechAssist] Re: Sony RA-2A KP-46C65 instantly blows IC601 & R608 > > > > > > Bob, don`t know, haven`t got the parts in yet, (ran out of IC601). I did > > check the customers > > ac outlet when I found out the parts were shorted again, had 124 volts, I > > guess I`m stupid for > > not thinking to plug it straight into the AC at the shop before returning > > the set, never gave it > > a thought, (won`t happen again) the fact that it shorts all 6 pins to each > > other would say a dead > > short to me but I sure as hell can`t find one, Thanks for the reply, Larry > > E > > Larry Eastman > > American TV & Electronics > > Crystal River, Fl. 34428 > > ----- Original Message ----- > > From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxx> > > To: <techassist@xxxxxxxxxxxxx> > > Sent: Friday, July 15, 2005 2:59 PM > > Subject: [TechAssist] Re: Sony RA-2A KP-46C65 instantly blows IC601 & R608 > > > > > >> Aside of plugging it into the variac at your shop, what happens when you > >> plug it directly into a normal outlet at your shop? Do it still short the > >> regulator or does this only happen at the customer's home? > >> > >> Bob Waterman, CET® #RI-28 > >> Master Technician License #9109 > >> Service Manager / Parts Manager > >> Gemini Computer, TV, & Security Alarms > >> (508)695-7302 > >> (508)695-7769 FAX > >> geminitv@xxxxxxxxxxx > >> > >> > >> ----- Original Message ----- > >> From: "Larry E" <videotech@xxxxxxxxxxxx> > >> To: <techassist@xxxxxxxxxxxxx> > >> Sent: Friday, July 15, 2005 2:50 PM > >> Subject: [TechAssist] Sony RA-2A KP-46C65 instantly blows IC601 & R608 > >> > >> > >> Hi Guys, My week for headache sets, this Sony RA-2A covers the following > >> models > >> KP41T65, 46C65, 48S65, 53S65, & 61S65, went to customers house and all > > pins > >> of IC601 (MX0841AB-F) were shorted to each other, also R608 the .1 1/2w > >> fusible resistor was open, pulled all of the little blue caps around > >> IC601 > >> and checked > >> them on the sencore, all ok. I ordered a new IC & resistor, installed > >> them > >> and when > >> I powered up the set they instantly blew, pulled set to shop, > >> re-installed > >> new chip > >> & resistor, plugged into variac & brought up slowly, set started and > > worked > >> fine, heres > >> the fun part, I brought the set back to the customer hooked it up and all > > I > >> get is a > >> constant blink of the led, of course IC601 & R608 were blown again, > >> Obviously my > >> Sencore variac being an isolation transformer let the set run but > >> connectiong to the > >> customers AC outlet lets the parts short, I have pulled every cap in the > >> "hot" side > >> of this power supply and found no shorted caps, checked the 2.2 meg > > resistor > >> R601, there is no continuity between hot & cold ground, customer told me > >> second > >> time out that they had lightning problems 2 days before set went down but > > I > >> see > >> no arcs etc on board, main fuse was not blown, HOT circuit good, seems to > > me > >> it > >> has to be hot & cold ground connected somewhere??? > >> please help if you can, I`m pulling hair out at this point, Larry E > >> Larry Eastman > >> American TV & Electronics > >> Crystal River, Fl. 34428 > >> ------------------------------------------------------------------------- - > > -- > >> - > >> This Email List is Public. 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