Hi Keith,
Time to update the title of this thread? Nice success, but how do "you" manage to have a 'scope with so many problems! :=)
Wavy readout is common. How pronounced depends on sweep frequency. You can minimize this (see cal proc somewhere) but don't expect miracles of that.
Readout centering can be adjusted also.
Your readout misses the decimal scaling, Time Slot TS-1. The -15V time slot pulse TS-1 should appear at interface contacts B33 of all bays, but the fault could be in a logic circuit further on. It's a good idea to read the readout theory first!
Albert
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Good News! We now have a working CRT and R7903!
The Short story: After replacing one resistor the screen came alive. After some adjustments there are two items remaining with this project that I need help with:
1. The readouts only gives one numeral. For instance, .5uS, 5uS, and 50uS all display as 5uS. Similarly, .5V, 5mV, and 50mV all say 5mV. Same for all settings, and regardless which plugins I use. The 10X multiplier makes no difference in the Readout display, though it does make it a little "wavy", like a slight vibration. Also, the Readouts are positioned a little low on the screen, so that the lower ones are half-obscured off the bottom of CRT frame.
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Your thoughts on how to approach the Readout problem?
Thanks,
Keith Ostertag
