Hi! I'm currently working on reviving a CBM 1702 monitor. I did most of the work about a year ago, and finally succeeded to take the display back to working order (my first ever trip to high-voltage analog land :-) ). Then faced some problems that prevented finishing things, got short of time and put the thing aside,... well, until yesterday. The primary problem that I faced, that, although the NTSC version is well documented, I couldn't find service manuals or schematic diags for the PAL version. Parts of the PAL main PCB obviously significantly differ from the NTSC board. Furthermore, the circuit is built up on Japanese integrated circuits (like the M51393A) whose datasheets I couldn't get hold of, either. Last year I did lots and lots of measurements and could draw up parts of the circuit, also using the NTSC service manual and Ray Carlsen's hand-drawn 1702 schematics. Those did it for fixing some artifacts that I had faced first (distortions and such), yet, I feel a little bit lost even with those drawings because of the unknown functions of the chips, and still have some little artifacts left to fix plus a full setup before assembling the thing together. If someone knew of / had at least specific parts of the PAL 1702 schematics, help would be greatly appreciated. Thanks, Levente PS. This display happens to be a 1702T, that is, a 1702 with a Toshiba CRT, model 1702F, PCB assy number GE-1011A. Message was sent through the cbm-hackers mailing listReceived on 2013-11-25 01:00:04
Archive generated by hypermail 2.2.0.