[TechAssist] Re: Sony RA-2A KP-46C65 instantly blows IC601 & R608
- From: Al L <alleathe@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 15 Jul 2005 15:46:48 -0400
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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