This Fireball Classic machine had some issues when purchased and all have been solved except one..Problem is with the 1 amp SB fuse blowing on initial power up of game..
First of all the game boots up and plays fine. New Alltek Ultimate CPU board. New Alltek lamp board.
All scoring / targets/ displays/bumpers/ flippers/etc are working fine; the only issue is the under playfield 1 Amp SB fuse.

I may have it narrowed down the problem. But need a little help solving the issue.
This is the scenario of the problem
--When i unplug the solenoid expander board and power up the game; the 1amp SB playfield fuse does not blow- the game plays fine except for the spinner not working.
--When i plug in the solenoid expander board and power up the game;the playfield 1amp SB fuse blows - the game still plays fine; the spinner works fine but the pop bumpers/kickers work at a reduced power.
I have replaced the original solenoid expander board with a newer "Great lakes Modular" version with the same results.
I have repinned the connector to the solenoid expander board. All wires match up with the original with the same results
I even have switched the original Solenoid Driver Board with a new Alltek Solenoid Driver Board - still the same results

In a nutshell- To play the game you either have the spinner working and have half power on the playfield because of a blown fuse or replace the fuse and unplug the solenoid expander board and play the game at full playfield power with no spinner.

Have anyone got a suggestion
thanks

Yes the "spinner" in my post is the spinning disc in the center of the playfield. Sorry for any misunderstanding.
The solenoid expander Board is the little board under the back of the playfield

Attached are two short video clips showing the solenoid expander board working in the attract mode and also during the lamp test mode. I have a newer version of the solenoid expander board installed and i was told that that the 555 bulb does not even need to be installed or working due to the improved design of the newer board. The board seems to working correctly- the blinking light /clicking/ spinner working without the 555 light on. Am i correct?
Maybe my issue is not in the solenoid expander board; but in a coil associated with the solenoid expander board.
Does the solenoid expander board in Fireball Classic control any of the secondary coils as well or is it just the "center spinning disc" ?
All coils seem to work fine in the solenoid test mode.

Attract mode :

Lamp test mode :

Thanks for the help ;I have looked at your ideas.

The ground braid was not attached in the head? Completely missed that one --see pictures for before and after . After I reattached the ground i tried a new fuse and it blew again- no difference.

The power module fuses in the bottom cabinet are all good. There is no 1 Amp SB fuse in that module. Unsure about that schematic posted. The only fuse affected is the under the playfield 1amp SB.

I have reexamined the wiring to the connector that was redone. I followed the same wire placement as the old connector had. Attached is a before picture and an after picture. They look the same to me .

dangle ground (resized).JPG

no ground (resized).JPG

ground reattached (resized).JPG

old SEB board and wiring placement (resized).JPG

new SEB wiring placement (resized).JPG

the transformer module

transformer module (resized).JPG

The New SEB used

SEB new (resized).jpg

A closer look at the new SEB with the JMP 1
The transformer picture i will get shortly

SEB image j (resized).jpg

is this picture any better

trans 1 (resized).JPG

unfortunately i'll have to check later- i have to go to work now.
i wish i had more time .....
.i will check that fuse as soon as i get back thanks for now

-- I checked the fuse in the floating two pin connector in the cabinet next to the transformer and the fuse was fine. Not blown.
-- I checked for continuity between pin 4 and pin 9 on the connector and could not get any continuity.
-- I reread my old notes from a previous repair attempt late last year and it looks like the original SEB did have the jumper attached; and i cut it off to try the original SEB board in the machine without the jumper.

i could not get any continuity on those pins noted . No continuity on pin 7 as well.
Continuity test- power off in machine-- diode setting on meter-- one lead on each area noted - correct ?

just checked the continuity from pin 4 to pin 7 -it did show show zero ohms
just checked the continuity from pin 7 to pin 9 -it did show show zero ohms

i will now go cut the jumper and see what happens

I cut the jumper in the new SEB. Turned on game and the fuse did not blow......
Everything worked perfect. The spinner and full playfield power.
Thank you very much for the help in getting this game to 100%

Nowhere on the instructions did it say to cut the jumper for a specific game.
One simple small cut..wow
thanks again