[TechAssist] Re: Sony RA-2A KP-46C65 instantly blows IC601 & R608
- From: Al L <alleathe@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 15 Jul 2005 16:42:44 -0400
My set had the cap shorted that isolates the rf input to the set,a disc
inside the can with the rf plug.
Al Leatherman
224 RT. 46
Mine Hill, NJ 07803
973-361-5796
WWW.ALS-TV.NET
----- Original Message -----
From: "Larry E" <videotech@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, July 15, 2005 4:09 PM
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, 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
>>
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