Hi all, just introducing myself and my current project to the group. I am a web programmer during the day but have always been interested in electronics. Always have been a 'part swapper' level of a electronic repair tech but know a bit of theory and how to read schematics etc. Also am a fan of audio tube amplifiers and looking to build my own circuits for home audio projects (preamp, active crossovers). Also need to fix a TV power supply for my brother at the moment; and have a tape deck I need to diagnose deeper than I can do with a DMM. So now I'm wanting to learn more; taking a class and just now getting into scopes and the deeper math side of things. But sticking with low Mhz needs and analog for starters.
Picked up a Tek 465 off Craiglist on Monday - it has a single non-sweeping dot in the center and a toasty hot sweep IC. I've been following the service manual diag steps and seeing low voltage on the +5v rail until the horizontal amp board connector is removed, then it stabilizes to 5v per my DMM. No -8v to be seen but solid +55 and +15. I have been told on the EEBlog forum to check for ripple; seems I need to buy another (working) scope to get that confirmed which I think I'll do. Any chance the less expensive USB O-Scopes can do ripple?
I see the custom Tek Sweep IC can be had from some specialty web sites so I may order one of those based on mine running too hot to touch. Otherwise I'm planning to test and swap all caps and transistors as needed. I also have a quality Tek o-probe on the way and a good Weller soldering station and pretty well equipped bench.
Thanks in advance; I'm hoping to ask more detailed questions as I have them but am starting testing from the power supply end.
- Neil
