Advice on coils for bally loop the loop

(Topic ID: 237125)

Advice on coils for bally loop the loop


By grandadpinball

22 days ago



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  • 13 posts
  • 6 Pinsiders participating
  • Latest reply 5 days ago by astyy
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#1 22 days ago

Hello, continuing to work away in strip and rebuild of my machine. trying to identify two coils I need to replace. 1 is the coil for HOLD and the 2nd is the coil for 2nd coin. none of these coils have markings and no reference to them on a document I have, called " Bally EM Pinball Coil Chart. If you can offer advice I would appreciate your help. One other question. The hold coil has a " resister" small Gray flat item with wire at either end. connected from one coil terminal to a blade with a Gray wire with red red tracer 91-3 on schematics. this seems to have got very hot at one time and may be burned out. Is this an original fit or has it been added to help load on coil? Thanks for your time and expertise. Pat

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#2 19 days ago

Do you have a high quality scan of the schematic you can post?

#3 19 days ago

http://www.planetarypinball.com/reference/partsmanuals/BLY_Parts_1969/index.html#/45/zoomed

Looks like the Hold relay is part # c-7800-335 https://www.marcospecialties.com/control/keywordsearch?SEARCH_STRING=C-7800-335

The 2'nd coin (same as 1'st & 3'rd coin ) chute # c-7800-384 https://www.marcospecialties.com/control/keywordsearch?SEARCH_STRING=C-7800-384

You would have to see the value of the resistor on the schematic but a fantastic post here about it & what it does https://pinside.com/pinball/forum/topic/what-is-this-4#post-3358932

#4 19 days ago
Quoted from currieddog:

Do you have a high quality scan of the schematic you can post?

Yes, OP, please post one. If you have the schematic you can get a high quality scan of it from (for example) Staples ($2) or Kinkos ($6)

#5 19 days ago
Quoted from chas10e:

http://www.planetarypinball.com/reference/partsmanuals/BLY_Parts_1969/index.html#/45/zoomed
Looks like the Hold relay is part # c-7800-335 https://www.marcospecialties.com/control/keywordsearch?SEARCH_STRING=C-7800-335
The 2'nd coin (same as 1'st & 3'rd coin ) chute # c-7800-384 https://www.marcospecialties.com/control/keywordsearch?SEARCH_STRING=C-7800-384
You would have to see the value of the resistor on the schematic but a fantastic post here about it & what it does https://pinside.com/pinball/forum/topic/what-is-this-4#post-3358932

Note that on this era of Bally flipper games, the hold relay is energized and the Tilt or slam switches literally short the hold relay hot wire to ground causing the relay to drop. It also causes one helluva spark when the switch is "made".

#6 18 days ago

Afternoon, thanks all for help on this I will arrange to purchase these, takes a few weeks as I'm in Scotland and I may raise another post as I'm concerned there is a fault somewhere in the start up sequence. For Currieddog, can I say the schematic I have is OK, I can read with good light and I could copy it for you. It would cost about £6.00 plus the cost of postage. Glad to help if you want one.

#7 14 days ago

Hello, You were right chas10e about the KKN 335 coil but as I do not have any relays for first/ third etc coin I cannot make a comparison. There are six relays that relate to starting and ending as follows-
END OF GAME READING 64.2 OHMS-------------PLAYER UP 91.4 OHMS-----------BALL RETURN 91.4 OHMS-----------HOLD 100 OHMS (KKN 335)---------
ANTI-CHEAT 9.5 OHMS-------------2ND COIN BROKEN. Do you think player up coil is the same as 2nd and do you have an opinion on the lower readings on end of game and anti-cheat? I have asked Marco specialties advice and the were good enoughto look at manuals etc but advised that the forum was best place for help. Praise indeed so thanks if you can help.

#8 13 days ago

I think the values listed are fine (except "broken" ) is "broken" a dead short or infinite resistance ?

The values for the 2 coils I linked above aren't listed in this chart: https://www.flippers.com/coil-resistance.html but you can see the values of other coils vary within those ranges

Quoted from grandadpinball:

Afternoon, thanks all for help on this I will arrange to purchase these, takes a few weeks as I'm in Scotland and I may raise another post as I'm concerned there is a fault somewhere in the start up sequence. For Currieddog, can I say the schematic I have is OK, I can read with good light and I could copy it for you. It would cost about £6.00 plus the cost of postage. Glad to help if you want one.

I think the idea of seeing a full schematic scan was to help assist you and others with this machine. I don't know how they get submitted to the IPDB .... this one is for the "replay version" https://www.ipdb.org/machine.cgi?id=1475

"add-a-ball version" here ... this one does have a snippet of the alternative wiring: https://www.ipdb.org/machine.cgi?id=5279

#9 9 days ago

Thank you again for this information. It is all helping to widen my knowledge which I hope will help get this game going.

#10 9 days ago

Is your Loop the Loop the replay or addaball version?

#11 5 days ago

Hi thanks Howard, sorry been away few days. The machine is a free ball machine.

#12 5 days ago

A bit closer to home grandadpinball Pinballmania has some Loop the Loop docs listed on his website
https://pinparts.co.uk/p/manuals-and-schematics

#13 5 days ago

Hi grandadpinball. Bally released two versions of this machine in Sep 66 - "Replay" and "Add a Ball". According to ipdb the AAB was exclusive to Italy so in Scotland you most likely have the Replay, but not impossible an AAB! I'm not sure if the Add a Ball is a true implementation as this machine precedes the conversion kit available from Rocket III in April 67, looking at the difference in parts it's probably some form of "Shoot Again". Apparently the AAB has a kicker instead of a special on the left outlane and a different backglass (by part number) which might help identify.

This machine interests me as it may be the first occurrence of the "rotary flipper", I have this too on my Rocket III.
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More info here;
Replay version https://www.ipdb.org/machine.cgi?id=1475
AAB version https://www.ipdb.org/machine.cgi?id=5279

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