electronics, repairs, service manuals and datasheets discussion community for the repairs professionals and technicians
FAQSearchMembersGroupsRegisterProfilePM'sLogin/Out
help!!

 
Post new topic   Reply to topic    Electronic equipment repair and service manual search discussion Forum Index -> Electronics General
View previous topic :: View next topic  
Author Message
adi82



Joined: 14 May 2007
Posts: 1

PostPosted: Mon May 14, 2007 11:29 am    Post subject: help!! Reply with quote

It is about a wind-velocity measurement digital circuit in an exam question.
Here is the link where you can see the circuit:
http://www.diskusjon.no/index.php?showtopic=752114&hl=+temperaturm%E5ler

Its norwegian but you can see the circuit if you scroll down on the page.

Well anyways the question is pretty simple actually:

The 7 segment display is showing 00 even though the wheels on the wind-velocity measurer are rotating.
What are the possible reasons for that??
Back to top
View user's profile Send private message
vtech



Joined: 08 May 2006
Posts: 1264
Location: USA

PostPosted: Tue May 15, 2007 1:23 am    Post subject: Reply with quote

Could be a number of possibilities. The optocoupler pulse is used as a source to counted down /process against a preset reference oscillator while trigerring the segment displays. Beside the connection& or power supply issues, I'd start by tracing the optocoupler pulse onward.....
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    Electronic equipment repair and service manual search discussion Forum Index -> Electronics General All times are GMT
Page 1 of 1

 
Jump to:  
You can post new topics in this forum
You can reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


eServiceInfo on FB - Service Manuals Free Download - Service Diagrams

Free TV Schematics Download - HARDW.net - Pinout Master - Jabse Service Manual Search - Jabse.InK  - onTap.bg

SnimkiOt.com - Poblizo.com : пътешествия