Yes. It is a Darlington. Dave ----- Original Message ----- From: "walter wood" <wwood_38478@xxxxxxxxx> To: <techassist@xxxxxxxxxxxxx> Sent: Saturday, February 08, 2003 12:57 Subject: [TechAssist] Re: Pioneer SD-P5183-K In power down > > FAX sent approx. 2:55 CST > Walter > --- Dave <audioserviceclinic@xxxxxxxxx> wrote: > > > > 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 > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > __________________________________________________ > > > > > > > Do you Yahoo!? > > > > > > > Yahoo! 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