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BSD fuse F104 fuse pops after cab refit

s000m

s000m

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Joined
Apr 12, 2021
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Swindon
Hi all,

So I took everything out of the cab. Put new decals with @jagman and refitted everything.

It turned on but the immediately F104 blew.

Sound turns and attract lights are working.

Balls won't feed into the trough and the up ramp stays down. Likely due to the blown fuse.

Does this mean I have a short to ground somewhere?

I did move the earth braid about and completely strip back the back box.

Any help appreciated...
 
Check all connections first especially the ribbon cables. Very easy to misalign then , Recently i misaligned the one that connects the cpu - power board but that blow a couple of fuses !! Think it was f114 and f104 ?

Just remembered it was f114 , f115 and f112
 
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Hi,
F104 is solenoids 9-16, which are the slings, bumpers, ramp and through. Good chance you have a short at one of them, so that‘s the first thing to look for. They are all coming from J107-2, so disconnecting J107 should stop the fuse blowing. Test that first, if it still blows you have an issue with the PD. Provided fuse stops blowing measure resistance of pin 2 on the plug to ground. Probably connected. Then follow that cable from coil to coil until you find the short. Could also be a shorted coil but unlikely if everything worked before you took it apart.
 
drhex said:
Hi,
F104 is solenoids 9-16, which are the slings, bumpers, ramp and through. Good chance you have a short at one of them, so that‘s the first thing to look for. They are all coming from J107-2, so disconnecting J107 should stop the fuse blowing. Test that first, if it still blows you have an issue with the PD. Provided fuse stops blowing measure resistance of pin 2 on the plug to ground. Probably connected. Then follow that cable from coil to coil until you find the short. Could also be a shorted coil but unlikely if everything worked before you took it apart.
Click to expand...
Hey also have a thread on FB.

Looks like J127 is responsible for the solenoids 9-16.

I disconnected that and the fuse didn't blow. So looks like I have a short in the playfield somewhere.
 
Great things are working again!
J107 is where the power to the coils is originating from, J127 is where the ground connection is made by the PDB to activate the coil. Given that none of the coils locked on per your description the issue had to be between J107 and the coils. Where did the starpost lights get their power from? A short to the sling arm should actually not create an issue by itself if there isn't anything else shorting out on the mech as it isn't grounded.
 
drhex said:
Great things are working again!
J107 is where the power to the coils is originating from, J127 is where the ground connection is made by the PDB to activate the coil. Given that none of the coils locked on per your description the issue had to be between J107 and the coils. Where did the starpost lights get their power from? A short to the sling arm should actually not create an issue by itself if there isn't anything else shorting out on the mech as it isn't grounded.
Click to expand...
Hey,

So they were piggy backing via crocodile clips to where I can't remember. They must have tied back the coils as they light activated upon a sling hit.

I've ripped them out as I never liked how they look. I did document where they are but they are in a sea of pictures i'd have to fish out.

I'll likely replace them with the lolipop slings @stumblor makes as I never did like the way these ones protruded out of the posts.
 
Ah OK, makes more sense, so were tied into the slingshot somehow then. Thought they were driven from the GI - would still check if there is anything else making contact to the metal on that slingshot to complete the path to coil power.
 
drhex said:
Ah OK, makes more sense, so were tied into the slingshot somehow then. Thought they were driven from the GI - would still check if there is anything else making contact to the metal on that slingshot to complete the path to coil power.
Click to expand...
Found a few exposed wires in different places. Some cut dash and solder jobs with no insulation here and there. Patched those up to be sure. Was a royal nightmare sifting through the loom.
 
Hope you're OK then - wouldn't hurt to measure voltage on the slingshot metal (should be none) as well as continuity to ground (shouldn't be either).
 
drhex said:
Hope you're OK then - wouldn't hurt to measure voltage on the slingshot metal (should be none) as well as continuity to ground (shouldn't be either).
Click to expand...
Not a bad shout.

The legs are off and its on the dolley at the moment while all the powder work on the parts I sent off is being done.

Once everythings back i'll give it another once over.

Right now its like being on roller skates so don't like having the playfield up :D
 
Just measure on the sling arm with the glass off, that is where the short supposedly happened after all.
 
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