VECTOR: Re: G05 and q502

[email protected] Mon, 09 May 2005 19:07:05 -0500
Newsgroups gmane.games.arcade.vector
Message-ID <[email protected]>
"Poor brightness with retrace lines could mean a defective D504, or
perhaps the “Z” signal wire is not connected properly to the base
of Q504." 

According to the manual, d504 is the Red LED. How does a
defective LED cause retrace lines?

-tom