Time to finally solve a long standing issue with my DE Star Wars. To do that I need some advice on how to measure power at the sound board with the sound board "in circuit".
Symptoms - Sound cuts out during play, and sound goes wonky like the sound board is rebooting ("May the Force", or shorter variations like just "May The" repeated multiple times). Worse now, sometimes the sound board doesn't finish booting at power on (hear the full "May the Force be with you", or something shorter than the abbreviated phrase that should normally be heard at boot, without music). Running original ROMS, not the upgraded version (but do have the upgraded ROMS from Chad available).
I measured voltages at the power supply board test points and see (after things stabilize and the machine warms up for 20 seconds or so):
12+ = between 11.83 and 11.87, goes to 11.67 if I start a game and leave the ball unlaunched (R2D2 head moving and Deathstar moving).
12- = 14.95
5+ = 4.99 (but measured lower when booting the machine from cold, maybe 4.7, then rose until finally stabilized at 4.99).
I'd like to use my DMM to measure power at the sound board with the machine in attract mode, and when powering on the machine. What would be the best way to do that while leaving the sound board in the circuit? Where would I put the red meter probe on the sound board?
Possibly unrelated, I could swear I see the Deathstar "stutter" a bit when it first starts rotating, but maybe it always did that.