Search found 1762 matches

by sylvain
Tue Mar 26, 2024 7:15 pm
Forum: Pinball machines (EM)
Topic: Gottlieb’s - Pro Football review
Replies: 8
Views: 1615

Re: Gottlieb’s - Pro Football review

Looking at the schematics, the G and BB relays and their contacts need to close and stay closed for 1/3 score motor rotation, e.g. for the 5 impulses of score motor 1A to make it to the 1000 pts relay coil for a touchdown (I assume another contact adds the other pulse for 6 points total). From my ex...
by sylvain
Mon Mar 18, 2024 8:25 pm
Forum: Projects
Topic: Gottlieb Stargate Restauration
Replies: 29
Views: 606

Re: Gottlieb Stargate Restauration

Wow, impressionnant, Bravo!
by sylvain
Sun Feb 11, 2024 8:02 pm
Forum: Pinball and Videogame Tech
Topic: Gottlieb Arena proper fuses rating
Replies: 3
Views: 176

Re: Gottlieb Arena proper fuses rating

It appears the manual indicates the actual circuits/voltages that the fuses protect, where the fuse card indicates the fuse ratings of the fuses themselves. Indeed this could lead to potential confusion. What is important is the current rating of the fuses along with their fast/slow blow ratings. Ne...
by sylvain
Wed Dec 20, 2023 3:48 pm
Forum: Stuff Sold and Old Ads (>6months)
Topic: Sold and gone: 1977 Bally Eight Ball pinball machine
Replies: 4
Views: 454

Re: Sold pending pickup & payment: 1977 Bally Eight Ball pinball machine

Sold and gone to a good home.
Thanks for the interest!
by sylvain
Wed Dec 20, 2023 9:48 am
Forum: Stuff Sold and Old Ads (>6months)
Topic: Sold and gone: 1977 Bally Eight Ball pinball machine
Replies: 4
Views: 454

Re: FS: 1977 Bally Eight Ball pinball machine

Thanks all for the useful info and kind words !
by sylvain
Sat Dec 16, 2023 2:51 pm
Forum: Stuff Sold and Old Ads (>6months)
Topic: Sold and gone: 1977 Bally Eight Ball pinball machine
Replies: 4
Views: 454

Sold and gone: 1977 Bally Eight Ball pinball machine

For Sale: 1977 Bally Eight Ball pinball machine Works great and fast, many new parts including rubber rings, leg levellers, pinball, some bulbs, some electronic parts, etc. Nice playfield & backglass. One broken plastic. Usual cabinet dings and scratches, overall nice. MPU had corrosion, neutral...
by sylvain
Tue Nov 28, 2023 8:04 pm
Forum: Pinball and Videogame Tech
Topic: Playfield Coffee table
Replies: 3
Views: 359

Re: Playfield Coffee table

It would be better to use LEDs for a lot less power and heat. Otherwise, use #47 bulbs instead of #44: #47 bulbs use 0.15A each at 6.3VAC #44 or #555 bulbs use 0.25A each at 6.3VAC Tally the number of bulbs and multiply by individual bulb power drain to get the current need, and add a bit for buffer...
by sylvain
Mon Nov 20, 2023 7:37 pm
Forum: Pinball and Videogame Tech
Topic: Kiss Sound board problems
Replies: 3
Views: 421

Re: Kiss Sound board problems

Congrats for having fixed your board and detailed the solution - well done!
by sylvain
Sat Nov 18, 2023 1:39 pm
Forum: MAACA Forum and Chat
Topic: Back in business
Replies: 8
Views: 622

Re: Back in business

Looks great, bravo !
by sylvain
Fri Nov 03, 2023 9:01 pm
Forum: Pinball Parts for Sale
Topic: OTTAWA Bally and Williams Plasma Displays
Replies: 3
Views: 439

Re: OTTAWA Bally and Williams Plasma Displays

I'd be interested in those 7-digit displays if they are still available.
PM sent. Thanks
by sylvain
Wed Nov 01, 2023 7:24 pm
Forum: MAACA Forum and Chat
Topic: Williams High Speed
Replies: 12
Views: 777

Re: Williams High Speed

Sound like there is a locked-on solenoid, caused by either a stuck switch (if special solenoids: slings, pop-bumpers), and a shorted associated drive transistor for that coil on the MPU board. The overheated coil (and its diode) probably needs replacement too if it has shorted internally. I assume t...
by sylvain
Mon Oct 30, 2023 6:57 pm
Forum: Pinball and Videogame Tech
Topic: Kiss Sound board problems
Replies: 3
Views: 421

Re: Kiss Sound board problems

Did the sound work initially before replacing every other board and repinning? Any chip burning hot on the sound board? (if so it is probably bad). I seem to recall that the Sustain potentiometer's adjustment is fairly critical to get sound too. I would also check voltages according to the diagram, ...
by sylvain
Mon Oct 23, 2023 8:04 pm
Forum: Pinball and Videogame Tech
Topic: LF: techs that want to tinker with weird small EM projects
Replies: 4
Views: 526

Re: LF: techs that want to tinker with weird small EM projects

Indeed those projects are fun. Always great opportunity to learn and be amazed by old technology and designs.
I wish I had more spare time - maybe one day I'll be able to retire eventually!
I might be able to help next year if you still have some projects that need attention.
by sylvain
Thu Oct 05, 2023 6:05 pm
Forum: Pinball and Videogame Tech
Topic: Bally 6803 credit match display out
Replies: 9
Views: 417

Re: Bally 6803 credit match display out

Hmm, interesting.
Does the issue still occur with switch matrix connectors J3 & J4 disconnected at the MPU?
Display connector J2 has no cold solder joints at the MPU?
by sylvain
Thu Oct 05, 2023 4:01 pm
Forum: Pinball and Videogame Tech
Topic: Bally 6803 credit match display out
Replies: 9
Views: 417

Re: Bally 6803 credit match display out

Something appears bad on the credit/match board - either shorted glass internally, bad U1 decoder chip, etc.
Have you tried a different 6-digit display in its place yet (make sure machine is OFF prior to disconnect/reconnect connectors).
Good luck!
by sylvain
Fri Sep 29, 2023 8:54 pm
Forum: Pinball and Videogame Tech
Topic: Bally mpu J4
Replies: 5
Views: 443

Re: Bally mpu J4

I would recommend to fix it. There is a reason why it was designed that way originally. With the age of those machines, missing one out of two ground pins might work for now, however over time a bit of resistance in the remaining connector pin might develop. That could lead to a small ground voltage...
by sylvain
Thu Sep 28, 2023 6:18 pm
Forum: Pinball and Videogame Tech
Topic: Bally mpu J4
Replies: 5
Views: 443

Re: Bally mpu J4

Looking at the Embryon schematics, MPU J4 pins 18 & 19 are grounds,
which connect to Solenoid Driver board connector J3, pins 18 & 19.
by sylvain
Wed Sep 06, 2023 6:55 pm
Forum: MAACA Forum and Chat
Topic: What did you do today in the hobby?
Replies: 5332
Views: 344496

Re: What did you do today in the hobby?

Almost done fixing a Gottlieb Jacks Open. Replaced all drop targets, tightened/adjusted all contacts. Initially drop targets did not score any points with no top inlane scored. Did some troubleshooting and found that the score motor 4B NC switch was open. That switch is very difficult to see and acc...
by sylvain
Tue Jun 13, 2023 9:19 pm
Forum: MAACA Forum and Chat
Topic: What did you do today in the hobby?
Replies: 5332
Views: 344496

Re: What did you do today in the hobby?

Working on a Road Kings that had prior repairs. Just completed MPU board work, etc.
Not quite done yet, but getting there. Fun during my limited spare time!
by sylvain
Thu May 18, 2023 6:42 pm
Forum: Pinball and Videogame Tech
Topic: Flash Gordon Strobe isolation transformer woes
Replies: 15
Views: 555

Re: Flash Gordon Strobe isolation transformer woes

The transformer appears good from your readings as far as I can tell.
Are you sure there is no 115VAC at its output if properly fed by 120VAC arriving at its primary?
by sylvain
Thu May 18, 2023 2:55 pm
Forum: Pinball and Videogame Tech
Topic: Flash Gordon Strobe isolation transformer woes
Replies: 15
Views: 555

Re: Flash Gordon Strobe isolation transformer woes

what value is displayed on your DMM?
The transformer might be good then?

It is unlikely in my opinion that all of the windings are opened
by sylvain
Thu May 18, 2023 1:02 pm
Forum: Pinball and Videogame Tech
Topic: Flash Gordon Strobe isolation transformer woes
Replies: 15
Views: 555

Re: Flash Gordon Strobe isolation transformer woes

What about trying to read resistance as opposed to continuity on the secondary and primary side of the transformer?
Maybe continuity is expecting only a low reading, whereas there will be some resistance for the windings in a good transformer
by sylvain
Thu May 18, 2023 11:37 am
Forum: Pinball and Videogame Tech
Topic: Flash Gordon Strobe isolation transformer woes
Replies: 15
Views: 555

Re: Flash Gordon Strobe isolation transformer woes

Do you have continuity on the right side between pins 1 and 2 for the fuse holder ?
Just to confirm that your meter works correctly in continuity mode
by sylvain
Wed May 17, 2023 8:27 pm
Forum: Pinball and Videogame Tech
Topic: Flash Gordon Strobe isolation transformer woes
Replies: 15
Views: 555

Re: Flash Gordon Strobe isolation transformer woes

Did this just occurred in your machine, or you recently acquired the machine with this issue? Does the transformer smell or look burnt? The other question you need to ask is why did the transformer burn, if it is burned indeed. A component in the strobe unit in the head might have cause an overload ...
by sylvain
Sun Mar 26, 2023 9:03 pm
Forum: Pinball and Videogame Tech
Topic: TZ problem again
Replies: 26
Views: 959

Re: TZ problem again

Strange - a 35V cap installed correctly should not smoke and short with 15.5VDC.
All the cap does is smooth the DC power arriving at J1-5, to feed the 7805 +5V voltage regulator input...