[TechAssist] Re: Pioneer SD-P5183-K In power down
- From: "Dave" <audioserviceclinic@xxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 8 Feb 2003 12:53:22 -0800
Sounds strange. Can you fax me the page? Send it to 661-296-6803.
Dave
----- Original Message -----
From: "walter wood" <wwood_38478@xxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, February 08, 2003 12:41
Subject: [TechAssist] Re: Pioneer SD-P5183-K In power down
>
> I believe that this is a darlington.
> The transistor Q308, that is in the circuit with
> it(and drawn on the pioneer schematic the same way
> as Q309) is findable on NTE and subs to a NTE261, a
> NPN darlington power transistor.
> It does NOT read shorted between emitter and base.
> In fact, it's over 70Kohms in circuit.
> What has me really puzzled is the fact that the
> schematic shows both of these to be two junction
> devices with damper and resistor.
> The resistor is blocked from the base by the second
> junction.
> If the 2SD2300 IS a darlington, then the info from
> the google search isn't correct. A NTE 2331 is a
> horizontal output, but not a darlington.
> Walter
> --- Dave <audioserviceclinic@xxxxxxxxx> wrote:
> >
> > If we're talking about a HO, yes that would be
> > the damper diode, and about
> > 40ohms sounds about right. It shows a diode
> > junction between
> > emitter/collector and base/collector and 40ohms
> > between base/emitter? If so,
> > yes that's normal.
> >
> > Dave
> > ----- Original Message -----
> > From: "walter wood" <wwood_38478@xxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Saturday, February 08, 2003 12:05
> > Subject: [TechAssist] Re: Pioneer SD-P5183-K In
> > power down
> >
> >
> > >
> > > I don't know, It's being used like a horizontal
> > > output, although pioneer calls it "High Voltage
> > > Det."
> > > Walter
> > > --- Dave <audioserviceclinic@xxxxxxxxx> wrote:
> > > >
> > > > This is kind of out of context, but I think
> > you
> > > > are describing a digital
> > > > transistor, correct?
> > > >
> > > > Dave
> > > > ----- Original Message -----
> > > > From: "walter wood" <wwood_38478@xxxxxxxxx>
> > > > To: "Tech Assist" <techassist@xxxxxxxxxxxxx>
> > > > Sent: Saturday, February 08, 2003 11:55
> > > > Subject: [TechAssist] Pioneer SD-P5183-K In
> > power
> > > > down
> > > >
> > > >
> > > > >
> > > > > This set goes into shutdown immediately.
> > > > > Dead, with the led on the front panel red,
> > and
> > > > > steady burning.
> > > > > Relay clicks, but must unplug to get the
> > set to
> > > > > attempt startup again.
> > > > > I found Q309, a 2SD2300 type, reads 40 ohms
> > > > across
> > > > > the base and emitter out of
> > circuit.According
> > > > to
> > > > > the schematic this shouldn't be. Of course
> > it
> > > > reads
> > > > > shorted in circuit, reads through a coil.
> > > > > Q308 is drawn the same way, and does not
> > read
> > > > that
> > > > > way. The pioneer schematic indicates a
> > diode
> > > > and a
> > > > > resistor, and two transistor junctions in
> > this
> > > > > package.
> > > > > The NTE on line cross reference does not
> > find
> > > > this
> > > > > transistor, and neither does Tritronics.
> > > > > A google search finds some discussion that
> > it
> > > > can
> > > > > be replaced by a NTE2331.
> > > > > This had to do with a RCA set.
> > > > > Pioneer does not give a part number.
> > > > > Can anyone give me any guidance
> > troubleshooting
> > > > > this set, and finding out about this
> > > > transistor??
> > > > > Thanks
> > > > > Walter
> > > > >
> > > > > =====
> > > > > Walter Wood
> > > > > Future Tech Home Center
> > > > > 2786 Hwy. 43 N.
> > > > > Lawrenceburg Tn. 38464
> > > > > 931-829-3337
> > > > > Fax 931-829-4044
> > > > > mailto:wwood_38478@xxxxxxxxx
> > > > >
> > > > >
> > > >
> > >
> >
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> =====
> Walter Wood
> Future Tech Home Center
> 2786 Hwy. 43 N.
> Lawrenceburg Tn. 38464
> 931-829-3337
> Fax 931-829-4044
> mailto:wwood_38478@xxxxxxxxx
>
> __________________________________________________
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