Completing the restoration of my Flash Gordon, its been awhile since I have had to trouble shoot a pin and I am having this issue with FG.

Pin boots up with correct number of flashes 7, target reset, Playfield and displays light as expected.
Doesn't start a game when set on free play, alltek MPU game selection switch left most digit set to one.
Fuse under PF was checked and is good.

What else would prevent a game from starting?

Forgot about that dip sw #28 turns off credit display.

Now have to solve DT switches and GI issue.

GI issue, power board J1 heating up after being on for a few minutes

Show some pictures

Power play
Need some assistance in identifying where these wires in picture go.
Located near MPU J1 wire colors are
black / yellow 83
2nd wire white / yellow 53
Game is Power Play
Connector diagram in manual doesn’t show these colors.
J1 connector doesn’t have empty slots

Any one with BOPP can look and see where these wires go

image (resized).jpg

Thanks wasn’t even thinking knocker because whole knocker assembly is missing

New problem
Displays are blank, have glow so displays are getting power.
All voltages are good
New MPU, transformer board repinned all connector have check pin outs w manual
Perform continuity check on A1 to A2J1 pins associated with displays
MPU boots upas it should

Thought?

Repinned connectors last thing done
Nothing in display
Display board tp1 = 0.5v tp2=177.6v

5v @ sdb A3J3-17
5v A1J1-20
Tp1 should be 5v, disconnect all connectors on MPU in case it loading it down

No change
Other thoughts?

Also tried another spare display w all others disconnect same effect 0.5 v tp 1

Yes been measuring TP3 w black lead, note tp1 = -0.5v

Wiring checkouts & measures out correctly as described above:

To eliminate possible board issues, i replaced SDB, MPU, rectifier / transformer one at a time with known good working boards.
No change, issues must be a wiring issue

Rechecked transformer & SDB J3 connectors both are correct

A) 3.6 M ohms
B) 0 ohms

Display boards TP 3 all measure 0 ohms

J3-20 to display Gnd is 0 ohms

Crimp is good, measured 0 ohms

A)0.1 ohms
B)0.3 ohms
C)0.3 ohms

First time I measure wrong pin on J3

Sdb gnds to display have continuity and so do 5 volt lines

Ok went back connected everything and it now works.
Guessing a pin must of been misaligned. Removing and replaced solved issue.

Thanks for walking me through this.

Drop target coils don’t reset at start or new game, coil test, DT sw score.
43 volts on both sides dt coil.
The save again post between flippers looks fried, could that be causing issues.

All flippers work fine

Targets reset both do

Interesting you mention wrong time activation.
Left & right PB will engage when either one is hit, but not the middle.
During coil test PB work like they should only popping one at a time. During game play L& R engage.
All other coils are working as should w exception of play more post.

Went through all switches and numbers do match.

NR SS is hinged game