[TechAssist] Re: Sony KV32TS46 volatage/ground inpediance ???
- From: Wayne Vanaman <Wayne@xxxxxxxxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 10 Oct 2005 08:02:32 -0500
I am kind of thick here, Peter.
Are you saying that from the AV inputs or the Tuner "F" connector you
can measure -158v VDC to the coax cable in the shop? As you specified
DC volts, does that mean you measured 0VAC?
There is a cap/resistor in parallel, between the two grounds of the set,
R640 C628. The cap is 470p and the resistor is 8.2Meg. What is the
voltage measurement across there? Should be half the line.
I don't see how you can have the same voltage reading to both the hot
and neutral lines.
As for what is normal with that set, 0V. Leakage current measurements
must indicate less than .5mA (500 micro amps)AC. If you don't have a
leakage tester .15uf in parallel with 1.5k ohm resistor can be used, the
voltage drop must be less than .75VAC.
I think I would pull the bridge rectifier D602 and test it.
Wayne Vanaman
Omega Electronics
6904 W Fairfield Dr
Pensacola, Fl. 32506-3310
Wayne@xxxxxxxxxxxxxxxxxxxxx
WWW.PensacolaTVRepair.Com
850-456-5995 voice
850-458-6369 fax
Peter oliver wrote:
> Dc volatage of -158V is seen with respect to hot or netural of AC line. They
> brought the set into us so I don't know about the integrity of the sat
> system, although they claim it didn't spark with a diffrent set..
>
> Peter Oliver
> Tucson Radio TV
>
>
> From: "Leonard Caillouet" <lcaillo@xxxxxxxxxxxx>
> Reply-To: techassist@xxxxxxxxxxxxx
> To: <techassist@xxxxxxxxxxxxx>
> Subject: [TechAssist] Re: Sony KV32TS46 volatage/ground inpediance ???
> Date: Sun, 9 Oct 2005 08:55:06 -0400
>
> What do you mean by "There is a DC potential seen of -158v Current???"
>
> Have you performed a leakage current test?
>
> Is the sat system grounded properly? Are there any outlets wired backwards
> on equipment connected to the sat system?
>
> Most of the sat installs that I have seen have not been grounded or not
> grounded according to code. If something fails that makes the ground hot or
> if an outlet is wired wrong and the system is not grounded it could find
> ground through the set and not blow a breaker.
>
> Leonard Caillouet
> Service Manager
> Electronics World
> Gainesville, FL
>
> ----- Original Message -----
> From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Saturday, October 08, 2005 11:24 PM
> Subject: [TechAssist] Sony KV32TS46 volatage/ground inpediance ???
>
>
> One of our customers brought int a sony KV32TS46 that they claim was
> sparking (from the ant input?)/ giving shocks when they were trying to hook
> it up to a new satilite system...
> The set was dead, Main fuse blown and worked when the fuse was replaced.
> DC impediance is >2meg (Ant to plug)
> No AC potential is measured when the set is pluged in and running
> There is a DC potential seen of -158v Current???
>
> Any idea what is normal for this set?
>
>
> Peter Oliver
> Tucson Radio TV
>
>
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