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(Topic ID: 253318)

Resistor Netowork/Displays Help on HS

By smileymatthew

1 year ago

Topic Stats

  • 7 posts
  • 2 Pinsiders participating
  • Latest reply 1 year ago by smileymatthew
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There have been 3 images uploaded to this topic. (View topic image gallery).

Display_signals (resized).jpg
Master_Display (resized).jpg
Display_Segments (resized).jpg

#1 1 year ago

Having an issue on this High Speed - The Lower Right Segment on the ALPHA displays is very very dim or not there at all. Replaced the Display board and ribbon cables with new, and no change. Everything else is fine.

Figure the issue is in a resistor network - after looking at the schematics, I'm having a hard time determining which network to replace. Looks like there 3 Resistor networks involved and then two others that go to the "Widget I/O" whatever that is! LOL

Would rather not replace all the resistor networks unless I have to, but can't figure out which segment goes to which Resistor Network I need to replace.

Many thanks for the help!


#2 1 year ago

Which displays are affected?
Which segment?

Display_Segments (resized).jpg
#3 1 year ago

Thank you. That helps a ton!

Just the "C" segment. and it's just on the alphanumerics.

#4 1 year ago

My guess would be a bad resistor at R39.
The lines with resistor networks are not for segment "C".

Master_Display (resized).jpg
#5 1 year ago

Yeah, except I put a new Master Display board in with new cables and the segment was still missing, so that leads me back to the Main MPU.

#6 1 year ago

That would be possible....
Then you need to check the signal at J22 or at the PIA U41-pin12.

Display_signals (resized).jpg
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