I picked up an old Galaxian cabinet this morning, pretty complete but in need of some relatively serious TLC. The prior owner was planning to restore, but never got around to it (and his wife wanted it gone).
As a first step, I wanted to try out the PCB on my bench and see if it works and/or can be fixed. For powering from a switcher for testing/debugging, do I need to jump D4/D5/R87 or can I get away with just increasing the switcher voltage to help offset the voltage drop from the diodes? Seems like folks are selling adapters with no reference to jumping those parts which is why its unclear whether its required or not. Also, have seen two different pinouts for DC use, one which connects E/5 to +5 and one which leaves them unconnected-- does it matter (at least for testing)?
The board itself looks pretty good (especially considering the age) so I would prefer to avoid non-critical changes until I figure out a long-term plan. Thanks!
As a first step, I wanted to try out the PCB on my bench and see if it works and/or can be fixed. For powering from a switcher for testing/debugging, do I need to jump D4/D5/R87 or can I get away with just increasing the switcher voltage to help offset the voltage drop from the diodes? Seems like folks are selling adapters with no reference to jumping those parts which is why its unclear whether its required or not. Also, have seen two different pinouts for DC use, one which connects E/5 to +5 and one which leaves them unconnected-- does it matter (at least for testing)?
The board itself looks pretty good (especially considering the age) so I would prefer to avoid non-critical changes until I figure out a long-term plan. Thanks!
