(Topic ID: 205428)

Monster Bash Ground short row 1


By SUPERBEE

2 years ago



Topic Stats

  • 37 posts
  • 8 Pinsiders participating
  • Latest reply 2 years ago by SUPERBEE
  • Topic is favorited by 2 Pinsiders

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#1 2 years ago

I just got a call from a friend of mine. He just moved and finally set up all his pins at the new place. When he turned on his MB he got a ground short row 1 error. He says the balls just sit in the trough and do nothing and he also cant seem to get into the test menues. Im going to go over and take a look at it for him tomorrow and was wondering if someone could help point me in the right direction. Im guessing a broken wire or something touching and grounding out somewhere ? He has the manual but really knows nothing about pin repair.

#2 2 years ago

BTW..it was working fine before the move.

#3 2 years ago

bump as im going over tomorrow and could use a little advice if possible ...

#5 2 years ago

When you get there, put it on a pallet and send it my way, I will send back something from my collection that works perfectly. Of course I will pay the shipping.

#6 2 years ago
Quoted from GRUMPY:

When you get there, put it on a pallet and send it my way, I will send back something from my collection that works perfectly. Of course I will pay the shipping.

LOL...He actually really wants my Getaway !! Once i put the new playfield in that is. Told him i would do an even swap ...

#7 2 years ago

What do you think i should be looking for ? Like i said, it was working fine until he moved it.

#8 2 years ago

never fails when you move games, something always gets pissed off

#9 2 years ago
Quoted from PinsideTroll:

never fails when you move games, something always gets pissed off

Aint that the truth! Any ideas anyone ?

#10 2 years ago
Quoted from GRUMPY:

When you get there, put it on a pallet and send it my way, I will send back something from my collection that works perfectly. Of course I will pay the shipping.

Oh, and btw... that comment was unusually unhelpful to me...

#11 2 years ago

I think Grump is too busy for me. I see he is over at another thread trying to win free swag !

#12 2 years ago

BTW Grump, i think you should get a half point for your answer ..

#13 2 years ago

Yep I should get 7 balls for that answer. I would help but stuck at work for 4 more hours. I may send info when your fast asleep.

#15 2 years ago

Ground row short Row 1 indicates something in row 1 is (you guessed it) grounding out! The row #1 switch are:

11 - Launch button
21 - Slam Tilt
31 - Trough Eject
41 - Not Used
51 - Left Slingshot
61 - Left Low Loop
71 - Right Ramp Enter
81 - Up/Down Bank Up

I'd check the Slam Tilt first.

#16 2 years ago

How about a metal coin box lid moved and landed on the slam switch causing a a short?

#17 2 years ago
Quoted from SUPERBEE:

he also cant seem to get into the test menues

Check the 12Volt regulated at TP / LED 100 on the powerdriverboard.

edit: extra
+ check the connectors on the CPU-board for misalignment or wrong plugged

#18 2 years ago

Thanks guys. That should get me to the problem. I'll keep you posted.

#19 2 years ago
Quoted from SUPERBEE:

Thanks guys. That should get me to the problem. I'll keep you posted.

This thread may be helpful as it shows the problem solved in the first post:
https://pinside.com/pinball/forum/topic/repair-ground-short-row-1-solved

Also, after moving a machine and getting errors, it is always a good idea to unplug and reseat the connectors in the backbox. Only take a few minutes, also pressing in on the chips on the boards helps too. That has fixed numerous problems for me after transporting.

#20 2 years ago

Well what did you find?

#21 2 years ago

No luck so far. It's blowing the fuse for the 18v flasher circuit which seems weird as it says in the manual that a ground short row 1 is a switch ground. Maybe wherever the short is it's causing the flasher circuit fuse to blow ? I pulled all the connectors on the cpu one at a time to try and isolate and narrow down where the short is but no luck. Went over all the connections under the playfield with a fine tooth comb but couldn't find any obvious issues. Reset all the connectors in the backbox and made sure all the chips we're seated well. Any idea where to look from here ?

#22 2 years ago

Would that be F114 fuse that is blowing? If yes then test BR1 for a shorted diode. They may not be any short at all on the playfield.

#23 2 years ago

I think it was fuse F116 but have to double check when I go back.

#24 2 years ago

I'm no expert but a friend of mine had trouble with a DM. No service buttons and kept blowing the fuse.
Was a BR1 issue and the board got sent away.Cane back and game works flawless again.

#25 2 years ago

WPC and WPC95 are getting mixed up here.

Quoted from zaza:

Check the 12Volt regulated at TP / LED 100 on the powerdriverboard.

Was it lit ?

Make a note which fuse it was because F116 is for a flipper.

My guess based on the 'info' above is that it was 18V for lampmatrix and one of the diodes D11-D14 is shorted and fuse F106 blew.
Check the LEDs on the driverboard, that's best to start with.

#26 2 years ago
Quoted from zaza:

WPC and WPC95 are getting mixed up here

Zaza is correct again.
I was looking at WPC schematics.
But I still think you will find a shorted diode and it had nothing to do with the move.

#27 2 years ago

You are correct zaza. It was the 18v lamp matrix with 106 blowing

#28 2 years ago
Quoted from GRUMPY:

But I still think you will find a shorted diode and it had nothing to do with the move.

Yes, agreed 100%

Quoted from SUPERBEE:

It was the 18v lamp matrix with 106 blowing

That explains it all. 18Volt + 12Vreg is missing, so no switches can be read by the CPU.

Measure the 4 diodes mentioned above.

#29 2 years ago
Quoted from zaza:

That explains it all. 18Volt + 12Vreg is missing, so no switches can be read by the CPU.

Measure the 4 diodes mentioned above.

Thanks guys, im new to all this so which diodes am i checking again ? Diodes need to be removed to check correct ? If so , can you tell me how to do it ?
Thanks again .

#30 2 years ago
Quoted from SUPERBEE:

so which diodes am i checking again

D11, D12, D13 and D14 .

Quoted from SUPERBEE:Diodes need to be removed to check correct ?

Just check them for ohm's, if one is shorted you will know right away.

#31 2 years ago

Thanks as usual Grump.

Quoted from GRUMPY:

Just check them for ohm's, if one is shorted you will know right away.

So just checking for continuity correct ?

#32 2 years ago

Yep.

#33 2 years ago

Or is that resistance ?

#34 2 years ago

ok cool . Sorry, still learning.

#35 2 years ago

You are looking for a short so continuity or resistance so it will work both ways.
Mind that there are big capacitors in this circuit so it will give distorted reading. And unplug J129 when doing this.

diodes like this:
https://nl.rs-online.com/web/p/rectifier-schottky-diodes/6391548/

1 week later
#36 2 years ago

Check the flipper opto board. Usually located in the lower cabinet or under the playfield. Square with six connectors on it.

1 week later
#37 2 years ago

Well my friends MB is back up and running. It was a shorted diode in the power supply section on the driver pcb.

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