Hi Dallas Thanks for all the replies. Hope I am not inconveniencing you too much.
Q203, NPN, 2N1304: EB/BE=Hi/0.23, CB/BC=Hi/0.24, EC/CE=Hi/Hi Q204, NPN, 2N1304: EB/BE=Hi/0.27, CB/BC=Hi/0.25, EC/CE=Hi/Hi Checked all diodes on both PCBs - all OK. Nothing getting hot anywhere. C119 is now a link feeding the LEDs, which illuminate BTW. So, some output from T202 at least Still, I am beginning to suspect transformer T202, but how do I test it? Next step is to disconnect the power supply PCB from the main board and see if I can get +-15v with no other load. Regards Lou On Wed, Jun 8, 2016 at 3:24 PM, Dallas Smith <[email protected]> wrote: > Hi Lou, > > I believe that the transistors are good. If they do not run to hot to hold > on to. > Yes CR105 feeds the negative supply. Did you check CR104 and CR105? > Q203 and Q204 should also be check since they could shunt the transformer. > Is transformer T202 and T203 hot. The high voltage windings on T202 could > be leaky. > Try taking out C119, did rails go to approximately 15 volts? > Time to start isolating the supplies to various circuits to find the > culprit by removing one leg of various resistors. > You can deal with the carbon resistor accuracies later. > I had all many issues with my meter, after all their very old. > > Dallas > > On 6/7/2016 11:09 PM, Lou Amadio wrote: > >> Hi Dallas >> I set my DMM on Diode Check mode: >> Q201, PNP, no part number: EB/BE=0.23/Hi, CB/BC=0.21/Hi, EC/CE=Hi/Hi >> Q202, PNP, no part number: EB/BE=0.22/Hi, CB/BC=0.20/Hi, EC/CE=Hi/Hi >> Q111, NPN, 2N1304: EB/BE=Hi/0.28, CB/BC=Hi/0.26, EC/CE=Hi/Hi >> Q112, PNP, 2N1305: EB/BE=0.26/Hi, CB/BC=0.25/Hi, EC/CE=Hi/Hi >> >> The two 15v rails are down to about 5v each. The oscillator is working but >> fluctuating badly on frequency. >> Replaced all the electro caps. Have not replaced the resistors or diodes. >> Will check these next. >> >> CR105 feeds the neg 15v supply cap?? >> Regards >> Lou >> >> > _______________________________________________ > volt-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts > and follow the instructions there. > _______________________________________________ volt-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
