(Topic ID: 198199)

1973 Sega Ali Baba / Arabian Night

By toytrix

4 years ago



Topic Stats

  • 10 posts
  • 4 Pinsiders participating
  • Latest reply 4 years ago by pinball4ever
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#1 4 years ago

Hi everyone,

I have recently purchased an Ali Baba machine, its my first EM. So far I have given it a good prelim clean and look over.
On power up, the score reels reset to zero but the the score drum keeps rotating and the ball doesnt get ejected onto the playfield. None of the playfield switch register.
The RESET PIN POSITION cables are lying in the bottom of the backbox.
I havent found and literature online for this machine and am therefore "going at it blind" so any help would be awesome thanks.
Duncan.

#2 4 years ago

These Sega machines are rare and they don't seem similar to Bally or Williams circuitry. You might want to check if any of the pinball parts Web sites have a schematic for this machine... Some simple things to check: Make sure the coin switches are open and not stuck in the closed position; check the score reels to make sure they are fully resetting; check all the score reel switches to see if they are clean and adjusted properly...

#3 4 years ago

Wow, what a great find - congrats! I've been looking for a Sega game from this era forever.

Make sure that even though the score reels are at zero that the contacts for each reel (that most likely close at the zero position) are actually closed (and you can get continuity readings across them). Also make sure the outhole switch is closed when the ball is resting on it (and you're getting continuity across that switch).

You could also try manually triggering the start relay to see if you can at least get a game started.

Good luck, and please post some pics if you get a chance!

Edit: Not really what I was expecting to see in the backbox. Looks like the score reels may not use the traditional switches I was imagining but more of a wiper system. I usually use the green scotch brite pads to clean these:

http://www.ipdb.org/showpic.pl?id=44&picno=59669&zoom=1

#4 4 years ago
Quoted from pinball4ever:

Wow, what a great find - congrats! I've been looking for a Sega game from this era forever.
Make sure that even though the score reels are at zero that the contacts for each reel (that most likely close at the zero position) are actually closed (and you can get continuity readings across them). Also make sure the outhole switch is closed when the ball is resting on it (and you're getting continuity across that switch).
You could also try manually triggering the start relay to see if you can at least get a game started.
Good luck, and please post some pics if you get a chance!
Edit: Not really what I was expecting to see in the backbox. Looks like the score reels may not use the traditional switches I was imagining but more of a wiper system. I usually use the green scotch brite pads to clean these:
http://www.ipdb.org/showpic.pl?id=44&picno=59669&zoom=1

Hi, thanks for your reply altho I may have worded my original post incorrectly.
When I power up the machine (switch it on) the GI all comes on as expected. When I push the red button on the outside of the coin door (start button??) the scoring reels (on the backbox) rest to zero, the scoring drum (motor and drum assembly in the bottom of the cabinet) keeps rotating and the ball doesnt eject into the shooter lane.

Yes I have checked the zero switches on the scoring reels (which are located on the front side of the scroing reels) and they are registering correctly, as is the outhole switch.

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#5 4 years ago
Quoted from fredsmythson:

These Sega machines are rare and they don't seem similar to Bally or Williams circuitry. You might want to check if any of the pinball parts Web sites have a schematic for this machine... Some simple things to check: Make sure the coin switches are open and not stuck in the closed position; check the score reels to make sure they are fully resetting; check all the score reel switches to see if they are clean and adjusted properly...

I have checked the switches you have listed (and added pics of them) and they all test OK.

#6 4 years ago

Another thing to check would be the player unit in the back box. I don't see a ball unit anywhere, might be incorporated into the player unit. Make sure it is resetting correctly. They often have worn springs.

#7 4 years ago
Quoted from Mk1Mod0:

Another thing to check would be the player unit in the back box. I don't see a ball unit anywhere, might be incorporated into the player unit. Make sure it is resetting correctly. They often have worn springs.

This is a good thought. If you look at the pic on IPDB, look at how dirty this unit is. On some older EM's, you have to sit and play with these units for hours to get them to behave like they did when the game is new (meaning moving freely around in circles when triggering it). Also, make sure to clean the wiper contact plate with a green scotch brite pad or equivalent. If these brass contact points are really dirty (on any of these types of assemblies), the game will never work correctly.

You could try manually ejecting the ball into the shooter lane once everything resets. Maybe the coil's burned out? Also, sometimes there is a switch that's triggered once the ball is shot from the outhole to the shooter lane (although I have no idea if there is with this game).

#8 4 years ago
Quoted from Mk1Mod0:

Another thing to check would be the player unit in the back box. I don't see a ball unit anywhere, might be incorporated into the player unit. Make sure it is resetting correctly. They often have worn springs.

Ahh yes that unit was very stiff/sluggish in operation. I removed and cleaned the contacts along with the leaf switches. Adjusted the preload on the spindle and manually tested with a successful result. It now has a much easier movement.

#9 4 years ago
Quoted from pinball4ever:

This is a good thought. If you look at the pic on IPDB, look at how dirty this unit is. On some older EM's, you have to sit and play with these units for hours to get them to behave like they did when the game is new (meaning moving freely around in circles when triggering it). Also, make sure to clean the wiper contact plate with a green scotch brite pad or equivalent. If these brass contact points are really dirty (on any of these types of assemblies), the game will never work correctly.
You could try manually ejecting the ball into the shooter lane once everything resets. Maybe the coil's burned out? Also, sometimes there is a switch that's triggered once the ball is shot from the outhole to the shooter lane (although I have no idea if there is with this game).

I looked at all the leaf wiper contacts inside the backbox on today's repair session. I physically removed each of the scoring reels and inspected the leaf switches and cleaned up the contacts (just to make sure I hadn't missed anything). I found one switch actuator was mis-aligned and not located in the correct position. The "ones" and "tens" scoring reels have wiper contacts as well as the triple leaf switches. I removed the reels from the spindles and cleaned the contacts, assembled and re-installed.
You may have seen on the inside of the coin door there were two cut wires from the slam tilt switch, I had to twist them together.
On power up, everything appeared as per previous attempts.
Added credits direct at the credit wheel.
Pushed the start button, hey presto the scoring reels reset to zero and a ball ejected into the shooter lane.
Everything appears to be working on the playfield and a game can now be played. I know I have to do more work to the ball counter assembly as at the moment it appears to be playing an endless game.
I have added a couple more pics of the reel assemblies, manly to show the triple leaf and wiper switch setups.

Many thanks for the hints, tips and information!

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#10 4 years ago
Quoted from toytrix:

Pushed the start button, hey presto the scoring reels reset to zero and a ball ejected into the shooter lane.
Everything appears to be working on the playfield and a game can now be played.

Great news, and congrats on bringing a piece of pinball history back to life!

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