Stockly.com Forums  

Go Back   Stockly.com Forums > Altair 8800 > Troubleshooting

Notices

Reply
 
Thread Tools Display Modes
  #1  
Old 05-24-2010, 02:35 AM
TomL_12953 TomL_12953 is offline
Member
 
Join Date: Jan 2007
Location: Malone, NY USA
Posts: 81
Send a message via AIM to TomL_12953 Send a message via MSN to TomL_12953 Send a message via Yahoo to TomL_12953 Send a message via Skype™ to TomL_12953
Default +5V Adjustment

My ACR is only reading +3.9V on the UART when it should be +5V. Does my power supply need adjusting? If so what's the best method? Do I remove all the cards and measure the bus lines? I don't want to blow all my boards!

Tom Lake
Reply With Quote
  #2  
Old 05-24-2010, 02:49 PM
marty marty is offline
Senior Member
 
Join Date: Jun 2007
Posts: 118
Default 5v+

Hi Tom;
Check the Regulator on the Board that has the Uart on it... (88-sio) it should be something like a 7805 or a 78M05... Also you could have a BAd Power Cap on either side of the regulator..... Also check the other Ic's on that Board, if the power is good on them , then check that you don't have a bent pin on the uart, or a short on the power pin to something else....
THANK YOU Marty
Reply With Quote
  #3  
Old 09-07-2010, 07:36 PM
peroja peroja is offline
Junior Member
 
Join Date: Sep 2010
Posts: 7
Thumbs up

Quote:
Originally Posted by marty View Post
Hi Tom;
Check the Regulator on the Board that has the Uart on it... (88-sio) it should be something like a 7805 or a 78M05...
THANK YOU Marty

7805 is correct
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 01:47 AM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2024, vBulletin Solutions, Inc.