Check the edge connector at the game MPU. Is it warm/hot to the touch after
15 minutes or so? If so, then I suspect you have toasted Common and
possibly +5VDC connections either inside the connector or the card edge
connector. This can damage the monitor because the monitor Common reference
point will not be the same as the MPU Common and this will offset the bias
of the transistors enough to take them out.
Many used a jumper wire to fix this edge connector problem with great
success....
John :-#)#
At 08:27 PM 30/12/2001 -0500, you wrote:
>Got another update on my Asteroids G05 monitor. After my last post about
>replacing the Hi Voltage rectifier and fixing the blooming screen and letting
>it run for 8 hours everything seemed fine so I left it on for another 2 hours
>and left it unattended. When I went back to check on it the monitor was dead
>and the player 1 and 2 buttons were flashing. I turned it off and looked it
>over and nothing looked burnt but the deflection board had blown F 101 and F
>700. It was late so I did not get back to it until today as yesterday was
>spent getting the Star Wars to play blind which it now does :-) The first
>thing I did with the Asteroids was to unplug the monitor and see if the game
>would play blind and it did. The next thing I did was to unplug the Hi
>Voltage unit and replace the blown fuses and turn it back on and see what
>happens. The fuses blew again so I new the problem was not the hi voltage
>unit but It still could have been the cause. Next I unplugged all the
>connectors from the deflection board except the power in and replaced the
>fuses again. This time no fuses blew and I think the spot killer led was on.
>Next time I plugged P700 which goes to one set of deflection transistors and
>when I turned power on it blew the fuses again. I removed the deflection
>transistors one by one and tested them and found 2 were dead shorted and 2
>were open, all 4 were toast. These were new transistors and had very few
>hours on them. What could have caused them to go bad? I replaced all 4 and
>checked everything on the deflection board and it checked out good so I put
>it back in and hooked everything back up except the Hi voltage unit. I fired
>it up and could here deflection chatter from the yoke and the led was off.
>Next I plugged the Hi voltage unit back in and installed the Hi voltage
>rectifier and turned it back on. The monitor came back to life and appears to
>work fine again. I am puzzled as to what happened. Did the transistors just
>get to hot? I had the back door off and it ran for 8 hours before it fried.
>Would it help to add a fan to aid in keeping it cooler. For now it's working
>fine and I want to keep it that way. If anyone has any ideas or suggestions
>please let me hear them. Thanks for reading, now back to the Star Wars
>monitor :-)
>Sam
>---------------------------------------------------------------------------
>** To UNSUBSCRIBE from vectorlist, send a message with "UNSUBSCRIBE" in the
>** message body to vectorlist-request@synthcom.com. Please direct other
>** questions, comments, or problems to neil@synthcom.com.
---------------------------------------------------------------------------
** To UNSUBSCRIBE from vectorlist, send a message with "UNSUBSCRIBE" in the
** message body to vectorlist-request@synthcom.com. Please direct other
** questions, comments, or problems to neil@synthcom.com.
Received on Sun Dec 30 18:16:03 2001
This archive was generated by hypermail 2.1.8 : Fri Aug 01 2003 - 00:33:47 EDT