|HP29C documentation and data|
Message #1 Posted by Vieira, Luiz C. (Brazil) on 18 Aug 2003, 5:21 p.m.
I'm taking the chance to try to repair two HP29C (unfortunately it seems their ACT are bad) and I decided to collect as much data as possible about them. I'll contact the owner and ask for a few more time with them so I can go further. Have a look at the image below (low resolution):
I scanned the mainboard and the power supply unit. I tried to "draw" the power supply in an electronic design SW but I did not achieve good results. So I decided to refine the original scanned image and generate the drawing over it. It seems I have a better look, now. I know it's not the final art I want but I'd like to ask you , please, check it and add your feedback so I can improve it. Original scanned images and track-only are saved.
I also removed the transformer and I measured its "coils" so it's now easier to "see" what's going on. I am transferring the "free-hand" drawings to an appropriate layout so I will add its final art later.
I measured the output DC voltages and I'll add them in a final drawing. I also tried to see (and record) the waveforms, but I have an old audio-lab, vacuum tube oscilloscope that is far from being able to read more than 100 kHz (if more than this, image is fuzzy and out of focus), so I cannot add this information.
I scanned the mainboard without any IC and the power supply, just a few components, both sides. This way I'll be able to generate final schematics.
I'll let you know as soon as it's ready and I'll post the information here. Please, Dave, is it O.K. to do it? I mean, will it be an issue if HP does not allow? Please, let me know.