Larry is the base of q410 low in standby or just he emitter? Gear Guy Electronic repair A/V systems design, maintenance and installation AMX programming Matt Sherer, CET 1411 Honeysuckle Lane Champaign, IL 61821 (217)356-9479 m.sheer@xxxxxxxxxxxxx ----- Original Message ----- From: "Larry E." <videotech@xxxxxxxxxxxx> To: <techassist@xxxxxxxxxxxxx> Sent: Saturday, August 03, 2002 4:39 PM Subject: [TechAssist] Re: Philips 25TR12 C102 chassis 25P606-OOAA > > Walter, yes there is 5 volts on the emitter if R417 is pulled, base & > collector read 2.64 & 2.54 ? > now I`m really confused, Larry E. > > walter wood wrote: > > >Larry, try removing R417. Plug the set in and see > >if there is 5vdc on the emitter of Q410. > >This removes all the 5v sources to the micro. > >Walter > >--- "Larry E." <videotech@xxxxxxxxxxxx> wrote: > > > >>Walter, I pulled & Ohmed R406 & R402 because I > >>only have 2.3v on > >> Collector of Q404, they > >>both check good so something further along is > >>pulling my supply down, > >>only have 1.2v on Q410`s > >>emitter, 1.8 on base and 2.3 on collector. No 5 v > >>line= no relay click, > >>I`ll keep looking, > >>thank you for your time and expertise, > >>Larry E. > >> > >>walter wood wrote: > >> > >>>Larry, the regulated power supply on these > >>> > >>chassis > >> > >>>is very close. > >>>The scan derived is different as is the micro. > >>>The standby 5v is on the emitter of Q410 through > >>> > >>a > >> > >>>6.8 ohm resistor R417. > >>>It then branches into 3 more 5 volt sources. > >>>L417 > >>>L418 > >>>and through R305 and L315. > >>>Q410 base looks like it is fed from the raw 156 > >>>volt b+ through F401,R406,R402,D415,D416 and > >>> > >>R416. > >> > >>>The collector of Q410 should have aprox. 6.6vdc > >>> > >>in > >> > >>>stand by.The emitter 5vdc and Base about 6. > >>>IC 345 on the P6 is fed 5v on pins > >>>17,13,18,36,40,16,48,34,33,32,30,31,and 44 > >>> > >>through > >> > >>>the remote receiver. > >>>Pin 17 also goes to the keyboard, and a stuck, > >>> > >>or > >> > >>>windex'ed button would kill the 5v. > >>>HTH > >>>Walter > >>>--- "Larry E." <videotech@xxxxxxxxxxxx> wrote: > >>> > >>>>Hi guys, got a 25P6 chassis totally dead, No > >>>>relay click, nothing. I > >>>>haven`t got the print for a > >>>>P6, I`m using a Y1/Y4 because the power supply > >>>> > >>is > >> > >>>>close. I have standby > >>>>B+ out of the regulator IC > >>>>to collector of Q403 the 9volt standby switch > >>>>but emitter is 2 volts > >>>>instead of 6.8, if the P6 > >>>>chassis works the same way as the Y1/Y4 this > >>>>means I don`t have my 5 > >>>>volt line for the micro. > >>>>The micros are both marked IC345 but they are > >>>>different, any ideas?? > >>>> > >>>>Larry Eastman > >>>>American TV & Electronics > >>>>Crystal River Fl. > >>>> > >>>>------------------------------------------ > >>>>To REMOVE your email address, click here: > >>>> http://www.tech-assist.org/unsubb.html > >>>>To CHANGE your email address, click here: > >>>> http://www.tech-assist.org/change.html > >>>>------------------------------------------ > >>>>***NEW*** Tips Added Instantly!!!*** > >>>>Submit Repair Tips here: > >>>>http://www.tech-assist.org/secure/tip/ > >>>> > >>> > >>>===== > >>>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! Health - Feel better, live better > >>>http://health.yahoo.com > >>>------------------------------------------ > >>>To REMOVE your email address, click here: > >>> http://www.tech-assist.org/unsubb.html > >>>To CHANGE your email address, click here: > >>> http://www.tech-assist.org/change.html > >>>------------------------------------------ > >>>***NEW*** Tips Added Instantly!!!*** > >>>Submit Repair Tips here: > >>>http://www.tech-assist.org/secure/tip/ > >>> > >>> > >> > >>------------------------------------------ > >>To REMOVE your email address, click here: > >> http://www.tech-assist.org/unsubb.html > >>To CHANGE your email address, click here: > >> http://www.tech-assist.org/change.html > >>------------------------------------------ > >>***NEW*** Tips Added Instantly!!!*** > >>Submit Repair Tips here: > >>http://www.tech-assist.org/secure/tip/ > >> > > > > > >===== > >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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