3atariSTE Posted December 30, 2016 Share Posted December 30, 2016 Hello ppl I'm repairing my Indus...the step-motor is dead (caused by the failure of U6 - UDN2541B). Of course I have ordered the parts (5x SN75437A). :-) But my question is another: I am seeing the mainboard and I saw an IC with the sign canceled The IC is U22 (CD74HC???).. Anyone knows the exact sign? Thanks for any help Maurizio Quote Link to comment Share on other sites More sharing options...
+Stephen Posted December 30, 2016 Share Posted December 30, 2016 I am attaching the Indus GT schematics I have. Sheet #2 shows U22 as a 74HCT32. I cannot vouch for the accuracy of these. Also attached a copy of the FSM. indus-schematics.zip INDUS_GT_FSManual.zip Quote Link to comment Share on other sites More sharing options...
3atariSTE Posted December 30, 2016 Author Share Posted December 30, 2016 Hi Stephen, thanks for your reply. U17 is 74HCT32. U22 seems to be equal to U20 and U24 (74LS74)....the HCT version is for TTL levels. So I think it is 74HCT74...but i'm not sure. Anyone can help me? Maurizio. Quote Link to comment Share on other sites More sharing options...
Like us on Facebook
Follow us on Twitter
AtariAge on Instagram
Watch us on YouTube
Chat on Discord
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.