Recent content by benindavis

crickets..... its sure been a while.... no takers eh?

Hello gang! Well, I pulled some transistors from the driver board and found a couple so far that do not test within the parameters stated by those far more learned than I. "A899 V KN" is printed on two. I have done a lot of digging and cant seem to find reference to EXACTLY what is printed on...

Well, I managed to comprehend, tested all of the multiple transistors in circuit .And it looks like l have to pull the little ones to get an accurate read....if only I was retired and had a clean work bench!!

Thanks!!..but now...Ow! My brain hurts. Ok, study time. I do have a multi meter with diode setting. And I got it on sale for $25... maybe its decent:)

thanks! but alas as an absolute novice... Im gonna have to crack some books to figure that out. replacing parts I can do fairly easily... serious brain work.....hmm well it will be a while

thanks for the good advice. ill have to learn how to test the transistors. Im gonna replace caps too. I checked all the resistors i could find specs for. 41 and 42, 43, and 44 all test over 150 ohms . 168, 156, 173, and 199 respectively. guess ill hit up some Youtube for transistor testing lesson.

While looking at the schematic for driver board I noticed that a number of the resistors inparticular have no data listed for them. The parts list shows ohm data for R33 to R50, but nothing for higher or lower numbered resistors... ie R56 , R17 ETC. Am I missing something? Or looking in the...

thanks!!

Ok, turns out I was mistaken about the offset. :rolleyes: I managed to get the offset to read correctly and if I pull the driver board it comes out of protection. Im gonna have to figure out how to check all the capacitors and resistors etc. gonna try to dig up a service manual I can get for...

correct!

when I click that link I get a ' page cant be found' msg

fuses are fine.

yes

Hi gang, So my VietNam vet neighbor gave me his 8080DB that had been hanging around in his garage for a few years collecting dust. Good for me, right? So I opened it up and blew out the dust ( remarkably little by the way) plugged it in and everything fired up. Some crackling on the volume and...