[TechAssist] Re: Sony RA-2A KP-46C65 instantly blows IC601 & R608
- From: "Larry E" <videotech@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 15 Jul 2005 17:25:41 -0400
Kevin, good point, Larry E
Larry Eastman
American TV & Electronics
Crystal River, Fl. 34428
----- Original Message -----
From: "Kevin's TV Repair" <kevintv@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, July 15, 2005 5:19 PM
Subject: [TechAssist] Re: Sony RA-2A KP-46C65 instantly blows IC601 & R608
> What if IC601 fails first?
>
> Kevin Wilks
> Kevin's TV Repair
> Penticton BC Canada
> kevintv@xxxxxxx
>
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Larry E
> Sent: Friday, July 15, 2005 1:44 PM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: Sony RA-2A KP-46C65 instantly blows IC601 &
> R608
>
> Kevin, It`s also supposed to open before it eats IC601 but it doesn`t,
> Larry
> E
> Larry Eastman
> American TV & Electronics
> Crystal River, Fl. 34428
> ----- Original Message -----
> From: "Kevin's TV Repair" <kevintv@xxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, July 15, 2005 4:34 PM
> Subject: [TechAssist] Re: Sony RA-2A KP-46C65 instantly blows IC601 &
> R608
>
>
> > That is what that resistor is there for.
> >
> > Kevin Wilks
> > Kevin's TV Repair
> > Penticton BC Canada
> > kevintv@xxxxxxx
> >
> >
> > -----Original Message-----
> > From: techassist-bounce@xxxxxxxxxxxxx
> > [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Larry E
> > Sent: Friday, July 15, 2005 1:10 PM
> > To: techassist@xxxxxxxxxxxxx
> > Subject: [TechAssist] Re: Sony RA-2A KP-46C65 instantly blows IC601 &
> > R608
> >
> > 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, CETR #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, CETR #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
> > >
> > >>
> >
> ------------------------------------------------------------------------
> > -
> > -
>
>
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