Thanks John, After a close inspection, I realise that the display test was showing the number 8 on all segments. According to service manual the ICs 12 and 14 are responsible to drive the "internal part" of each segment, and the ICs 11 and 13 the "external part". A number 8 uses only "external" filaments and athe letter K, for instance, uses some "internal" ones. Put my scope on IC 14 and no action on output pins... Today i'll try to buy one mc14094bcp on some local store, and see what happens... Thank you guys! JL Enviado via iPad Em 03/03/2013, às 16:06, John Robertson <jrr@flippers.com> escreveu:
John Robertson wrote:
Jose Luiz Martins wrote:
Hi !
Today I've decided to put my 9010A back to work after 5 years.
It boots OK, but the display is not showing some parts of some letters. For instance the K and V looks like I.
I opened and performed the display test, as mentioned on Workshop manual, and everything seams to be right.
Any clue on that ?
Thanks
JL ___
Haven't done the display test in years - does it check every segment? If so, and the segments all light up as they should then you may have a ROM issue where some of the ASCII code text in the text tables is defective. That is just a guess, you can check against the code on the ftp site to make sure the base ROMs are all good.
Anyone else with a guess?
John :-#)#
Could be the decoder for the display, sounds like it handles individual segments OK, but may a problem with combinations needed to build letters...
John :-#)#
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