[TechAssist] Re: Sony RA-2A KP-46C65 instantly blows IC601 & R608
- From: "Damon" <DamonEB@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 15 Jul 2005 21:26:37 -0500
That is a good point, if the main neutral wire going into the service box
has opened/developed Hi resistance the entire houshold will be seeing about
220 from time to time.....might have the customer call the power company and
have them test the resistance of the service lines.
I don't know if the voltage would rise if only that specific line had an
intermittant neutral, I think you would experience "brown outs" with
anything connected to that tho'
Damon B
Telrad Electronics
Fort Wayne IN
----- Original Message -----
From: "Jerome Silverman" <greentron@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, July 15, 2005 7:14 PM
Subject: [TechAssist] Re: Sony RA-2A KP-46C65 instantly blows IC601 & R608
> 124 volts is suspiciously high, even for Florida. If he has lost the
neutral
> the voltage will go up and down as various loads around the house change.
> Jerry Silverman
> Greentron Inc
> 4 Newland Ave Greenville SC 29609
> Fax/Phone 864 232 3889
> greentron@xxxxxxx
>
> ----- Original Message -----
> From: "Larry E" <videotech@xxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, July 15, 2005 5:24 PM
> Subject: [TechAssist] Re: Sony RA-2A KP-46C65 instantly blows IC601 & R608
>
>
> > Phil, no vdr`s in this chassis, I`m looking at the isolation issue only
> > because I find no
> > parts in the primary circuit that are bad, (or the secondary for that
> > matter) yet it runs
> > if I power it from the variac? I`ve ordered new IC`s and resistors, I`ll
> try
> > operating
> > it from the variac when I get the parts in and if it runs off the variac
> > I`ll try
> > running it directly from the shop wall outlet, if it runs from my AC
> outlet
> > then
> > Bob Waterman may be right there may be an issue with the customers AC as
> he
> > said he had a violent strike of lightning 2 days before the set went
out,
> > you know
> > the drill down here, sprinkler system, garage door openers, etc. etc.
His
> > outlet
> > read 124 volts though when I was there, we`ll see when the parts come
in,
> > Thanks for the reply, Larry E
> >
> >
> > Larry Eastman
> > American TV & Electronics
> > Crystal River, Fl. 34428
> > ----- Original Message -----
> > From: "Phil Bader" <tjanphyl@xxxxxxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Friday, July 15, 2005 5:01 PM
> > Subject: [TechAssist] Re: Sony RA-2A KP-46C65 instantly blows IC601 &
R608
> >
> >
> > > You are assuming this is an isolation breakdown issue. Maybe not. Does
> > > this chassis use VDRs around the MXO841? These VDRs do go bad.
> > > Just a thought. I'll polk around when I'm not fixing table radios.
> > > Phil
> > > Phil
> > >
> > > Philip Bader
> > > Jan Phyl TV Inc. (estab. 1976)
> > > 3420 Recker Hwy. Winter Haven, Fl. 33880
> > > Fax (863) 299-8821
> > > email: tjanphyl@xxxxxxxxxxxxxxx
> > > personal/ alt. email: pbader@xxxxxxxxxxxxxxx
> > > see our ad at:
> > >
> >
>
http://jan-phyl-television-pc-monitor-service.9601288257006.worldpages-ads.c
> > om/
> > >
> > >
> > >
> > > Larry E wrote:
> > >
> > > >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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