John's Arcade Forum - Classic Arcade and Pinball Collecting and Restoring Discussion Forum - RETRO MAME - Nintendo Vs Forum
October 31, 2024, 06:46:25 pm *
Welcome, Guest. Please login or register.

Login with username, password and session length
News: Welcome to the John's Arcade Forum. Glad you made it! Smiley
 
   Home   Help Search Calendar Login Register  
Pages: [1] 2 3
  Print  
Author Topic: Asteroids Deluxe no voltages.  (Read 10004 times)
0 Members and 1 Guest are viewing this topic.
Jack
Jr. Member
**
Offline Offline

Posts: 73


Jack Kirkpatrick


View Profile
« on: July 25, 2015, 02:56:00 pm »

I have an Atari Asteroids Deluxe that I just picked up today, broken. I replaced the power transistor because it was bad, but it still won't work. I noticed the voltage selector and molex connector are missing on the power "brick". Does anyone know if this is normal?

The monitor and light kicks on, however there is no voltage to the board.
Logged

Jack
Jack
Jr. Member
**
Offline Offline

Posts: 73


Jack Kirkpatrick


View Profile
« Reply #1 on: July 25, 2015, 03:52:40 pm »

Update: Voltages at the test leads are 0.01-0.05 volts. I am thinking the big blue capacitor.
Logged

Jack
iankellogg
Global Moderator
Hero Member
*****
Offline Offline

Posts: 1433



View Profile
« Reply #2 on: July 25, 2015, 04:29:40 pm »

First check fuses.
Then check voltages on the power brick. Check the dc voltage between pin 1 and 5 of the 15 pin connector.

Should be something above 9v dc

I doubt the big blue is bad. You won't be able to test that properly until you have a working game. However if you want to see if it's the problem just do a ac voltage test between pins 1 and 5 of the 25 pin connector and if it is more than maybe 3v ac then it might be bad.

« Last Edit: July 25, 2015, 10:08:14 pm by iankellogg » Logged

https://iankellogg.com
Cap kits, eproms, and more
Jack
Jr. Member
**
Offline Offline

Posts: 73


Jack Kirkpatrick


View Profile
« Reply #3 on: July 25, 2015, 04:48:53 pm »

0V between 1 and 5
Fuses are all good.
« Last Edit: July 25, 2015, 04:51:08 pm by MyTechtime » Logged

Jack
iankellogg
Global Moderator
Hero Member
*****
Offline Offline

Posts: 1433



View Profile
« Reply #4 on: July 25, 2015, 10:11:21 pm »

What is the ac voltage between 6 and 7
Logged

https://iankellogg.com
Cap kits, eproms, and more
Jack
Jr. Member
**
Offline Offline

Posts: 73


Jack Kirkpatrick


View Profile
« Reply #5 on: July 25, 2015, 10:40:37 pm »

About 36
Logged

Jack
iankellogg
Global Moderator
Hero Member
*****
Offline Offline

Posts: 1433



View Profile
« Reply #6 on: July 25, 2015, 10:42:34 pm »

You need to get the power brick out of the cabinet to continue any more work on it. Either the diode bridge is broke somehow or a wire came loose. But there isn't anything more we can do with it in the cabinet.
Logged

https://iankellogg.com
Cap kits, eproms, and more
Jack
Jr. Member
**
Offline Offline

Posts: 73


Jack Kirkpatrick


View Profile
« Reply #7 on: July 25, 2015, 10:44:02 pm »

I've removed it a few times already. All the wiring inside it is fine.
Logged

Jack
iankellogg
Global Moderator
Hero Member
*****
Offline Offline

Posts: 1433



View Profile
« Reply #8 on: July 25, 2015, 10:46:05 pm »

Have you checked the bridge? Does the bridge get AC?
Logged

https://iankellogg.com
Cap kits, eproms, and more
Jack
Jr. Member
**
Offline Offline

Posts: 73


Jack Kirkpatrick


View Profile
« Reply #9 on: July 25, 2015, 10:48:39 pm »

I haven't. How exactly do I test the bridge rectifier?
Logged

Jack
iankellogg
Global Moderator
Hero Member
*****
Offline Offline

Posts: 1433



View Profile
« Reply #10 on: July 25, 2015, 10:52:10 pm »

The short answer is use the diode test on your multimeter and kind of probe between any two adjacent pins and you should have either 0.5v or OL. Test each pair both directions. You should have 4 0.5v results. And two 1.4v results.

The extra short answer. Have the thing flipped over and plug it in. Two pins will have AC voltage and two will have DC voltage.
Logged

https://iankellogg.com
Cap kits, eproms, and more
Jack
Jr. Member
**
Offline Offline

Posts: 73


Jack Kirkpatrick


View Profile
« Reply #11 on: July 25, 2015, 11:21:25 pm »

One pair is about .8 volts one way and nothing the other
Other pair is nothing either way
Logged

Jack
iankellogg
Global Moderator
Hero Member
*****
Offline Offline

Posts: 1433



View Profile
« Reply #12 on: July 25, 2015, 11:23:36 pm »

You Have To Test Every combo of pairs.  They are all interconnected. I should also mention there is going to be a pair where itblocks in both directions.

It's still easier to test voltages when it's on. 
« Last Edit: July 25, 2015, 11:27:58 pm by iankellogg » Logged

https://iankellogg.com
Cap kits, eproms, and more
Jack
Jr. Member
**
Offline Offline

Posts: 73


Jack Kirkpatrick


View Profile
« Reply #13 on: July 25, 2015, 11:36:14 pm »

All pairs look good except two. One does conduct either way and the other one gives .8 v one way instead of .4
Logged

Jack
iankellogg
Global Moderator
Hero Member
*****
Offline Offline

Posts: 1433



View Profile
« Reply #14 on: July 25, 2015, 11:39:44 pm »

That sounds good. Just finish that up with checking the voltages.  I don't remember if they label the pins or not. Either way here is all the common styles
Logged

https://iankellogg.com
Cap kits, eproms, and more
Pages: [1] 2 3
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2015, Simple Machines Install Simple Machines Forum Valid XHTML 1.0! Valid CSS!