(Topic ID: 61134)

Official Seawitch Fan Club ... All Welcome

By DirtySouth

6 years ago

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  • 914 posts
  • 116 Pinsiders participating
  • Latest reply 12 days ago by cottonm4
  • Topic is favorited by 40 Pinsiders


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Post #209 Replacement Shooter Lane Ball Gate by Cliffy Posted by Cliffy (4 years ago)

Post #391 Link to IPDB for manual / schematics. Posted by frunch (2 years ago)

Post #512 Link for guide to wiring in new rectifier board. Posted by Chalkey (1 year ago)

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#692 1 year ago
Quoted from Chalkey:

Use the Steve Kulpa guide linked, cross reference the schematics if necessary. I'll get you a photo when I get home if you need it.

Looked there but it looks back to front, if you could do a photo that would be great - cheers!

#701 1 year ago

So i've re-pinned the connectors on the TA-100 all showing correct voltages. I can't seem to get the 5v on the SDU-100 Rev C.

- Re-pinned connectors J3 and J4
- Rebuilt 5v section (apart from 2.2 Cap)
- New Voltage Regulator (tested on bench)
- Ground mods done and 5v TP1 -> Tp3

Now i can give the board 12v on the bench and all is well, but as soon as i plug it into the backbox no 5v, i've checked pin 12 on J3 and its giving out 12v unreg.

Its got me scratching my head some what..

Any ideas?

#703 1 year ago
Quoted from j_m_:

silly question, but have you checked continuity on the wire(s) that should be providing the 5v to the SDU board from the rectifier board?

Cheers, I am getting the 12v unregulated, 5v is regulated from this on the SDU board.

#704 1 year ago

Right i've sorted the SDU board out and the game now boots and i can start a game. All switches are registering in test, only problem i have now is the Solenoids don't seem to be working correctly, i.e If the Right slingshot is hit the knocker sounds and the right bumper will trigger the ball trough.

Any help would be appreciated

#708 1 year ago

I got the probe out and tested U2 on the SDU and pin 23 isn't pulsing. I've ordered a replacement.

2 weeks later
#709 1 year ago

Do these roms get bitrot or something, i've not had a battery in there (was waiting on a memory cap) and the ram won't clear now. All the displays show 22, it was working before. I'm sure i remember reading something about it corrupting the code if there is no battery?

2 months later
#735 10 months ago

Does anyone have a file or measurements on the plastic add-on to stop the ball going on the plastic?

8 months later
#866 54 days ago

I am only getting 6 flashes when I power on my seawitch. If I go into diagnostics the solenoids fire as it goes through the test but one thing I've noticed is there is all 2's on the display - is this a faulty 6810?

#868 53 days ago

Sorry didn't really explain myself properly:

I can enter diagnostics pressing the button on the mpu, then pressing the button the coin door

Its not all 2's just like some random score on the displays and 22 on the credit display.

#870 53 days ago

Its a stock MPU 200.

Instead of being 0's its random numbers, i seem to remember reading that if you ran it without a battery for a bit it corrupts the ROM - which i find very hard to believe.

I'll check the voltages in a bit.


#872 53 days ago

No batteries in yet.

#874 53 days ago

Does it do silly things like this with no batteries?

#876 53 days ago

Every day's a school day

#877 53 days ago
Quoted from Quench:

Sounds like you have an Alltek MPU board.
Failure to get the 7th LED flash means that the MPU board is not getting it's 43 volt input. It comes in at pin 15 of MPU board connector J4.
Get your multimeter out and measure it:
Factory Stern MPU board you should measure 21 volts at test point TP1
Alltek MPU board revision L you should measure 43 volts at test point TP2
Alltek MPU board revision J and K you should measure 43 volts at test point TP7
any other revision Alltek, you need to look in their manual for it.

Sorry, if you get a '2' where there should be a '0', a '3' where there should be a '1', a '6' where there should be a '4' etc, then it's the same issue at pin 26 of connector J1.
Anyway it sounds like you may have a few MPU board connector issues that need to be dealt with.

Just tried now and it booted into a game, turned off and it wouldn't do the 7th flash.


TP3 = 21/22v
TP2 = 14v
TP5 = 5.1v

Pin 15 of J4 = 45v

So all within range, i think i will repin that J4 and see if that makes any difference.

#879 51 days ago

Thanks. What will the logic probe show in a working system?

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