[TechAssist] Re: Panasonic CT-32HX40B, Chassis DX2/AP346 Int High Voltage
- From: "art bevilacqua" <abevilac@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sun, 14 Sep 2003 18:23:10 -0400
Thanks for getting back to me on this:
Actually, there are a ton of relays in this set. There is one that turns =
on
the main ac supply, one for the degausser, one relay puts a short across =
a
soft start resistor after a short turn on delay, and the one that send =
the
140Vdc over to the horizontal (B+ on/off).
The pins at the microprocessor that I've checked (ac on/off and degauss) =
are
toggling at the micro and the relays are working. The B+ on/off is not
picking up, and that's what I'm trying to find the cause of. What I'm
imagining is that the micro is looking for some kind of feedback about
something or other before it picks up the B+ on signal, but there is =
nothing
in the manual or schematic that indicates what that logic might be.
Until I got another tip about the soft start resistor, I didn't even =
realize
that relay existed so I plan to check on it's operation first thing in =
the
morning.
Art Bevilacqua
Essex Radio and TV
40 Main Street
Essex, MA 01929
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Al L
Sent: Sunday, September 14, 2003 3:25 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: Panasonic CT-32HX40B, Chassis DX2/AP346 Int =
High
Voltage
art,
If the micro toggles,check from there on to the relay and driver.If
necessary,float the pin on the miocro to see if it toggles and trace to =
the
driver base,and see if the driver pulls down the relay.You may hear the
degauss relay cl;ick.,or the problem could be in the horizontal.
If you have the notes,jump the on off relay and see if the hv comes =
up.
good luck.
Al Leatherman
224 Rt. 46
Mine Hill, NJ. 07803
973-361-5796
WWW.ALS-TV.NET
----- Original Message -----
From: "art bevilacqua" <abevilac@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, September 13, 2003 9:34 PM
Subject: [TechAssist] Panasonic CT-32HX40B, Chassis DX2/AP346 Int High
Voltage
> This set has been in the shop too long and it's quite large, I really =
=3D
> want
> to get it going. The set will fire up ok sometimes, but usually sound =
=3D
> comes
> up with no high voltage.
>
> I've downloaded the manual for this set, and have found that there is =
a
> relay in the 140V B+ line from the power supply transformer that is =
not
> being picked up, hence no power to the horizontal output section. The =
=3D
> signal
> that drives this relay is called B+ on/off and comes from the
> microprocessor.
>
> During startup, the micro pins labeled AC on/off and degauss toggle =
and
> relays within the set click, but the B+ on/off doesn't.
>
> All other voltages at the secondary of that transformer (-16, +24, =
etc) =3D
> are
> good.
>
> I wondering whether anyone has a training manual on this set that =
tells =3D
> why
> B+ on/off might be blocked from working. The micro costs $42, and the =
=3D
> set
> will fire up now and then, so I want to avoid buying that chip if =3D
> something
> else is preventing startup.
>
> Thanks
>
> Art Bevilacqua
> Essex Radio and TV
> 40 Main Street
> Essex, MA 01929
>
>
>
>
>
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