Maybe a pic of the curcuit board may help?

Reseat all connectors and boards in the backbox. If that doesn't help then you've got electronics problems. Possibly that "push-to-reset" circuit breaker is bad. If so, you can replace it with a 2.5 amp slo-blo fuse and fuseholder. If that doesn't fix it, then test bridge rectifier BR402. If that's ok, then test/replace integrated circuit IC101.

Be sure to read everything here:

http://www.pinwiki.com/wiki/index.php?title=Sentinel_/_Wonder_Wizard

Thanks for posting this thread ...have one in their garage and this will be very helpful

Change all three of those crappy circuit breakers with fuseholders and use 2.5 amp slo blo fuses in each one.

Best of luck. Had one of these as a kid; brings back so many memories. I’d love to find one in the Dallas area for sale

Looks like common metal tarnishing to me. All of those transistors are the solenoid drivers.

You can test those transistors. I did a Flying Aces a couple yrs back as a learner for soldering and testing basic circuit board parts. I ended up replacing the flipper transistors drivers and pre drivers. Also changed 3 or 4 of the IC chips. Got it up and running a 100% and my buddy gave me a hundo for it which is what I had in it.
I also replaced the bridge rectifiers and did the same with the fuse holders. I wish I could remember all that was wrong with it when I started. Trying to look back and find the thread.

I think I have some IC chips left over. I will check tonight. If you need them! My pop bumpers were also not working and the IC chip fixed that problem.

Nice! It's a great little pin to start out doing those kinda things with. I learned a lot from that little HUO pin. And KenLayton was a big help as well!!!

Me too Dallas. My brother and I bought it brand new for about $ 200 (lots of money when we were making $5/week delivering newspapers at the age of 12).

We loved it and my Dad modified the flippers with a separate bracket and coil so they would work "normally". It lived in my bedroom next to my bed

Dave

Bally used 1/4-28 (fine) threads (headless set screws) on their flipper pawls. I would assume that is what is used on your machine.

Did you get this fixed? I have the exact same machine. Everything works but the flippers and bumpers. Powers on calculates score etc. I cleaned all the coils but it made no difference at all.

And I have had this machine since 1978 when Santa brought it. Lol

https://pinside.com/pinball/forum/topic/flying-aces-pinball-by-sentinal
This might help a little.
Never mind wrong one.

The hard to find score display chips shown simply as 4433 chips on the schematic are actually type SCL4433ABE for everyone's information.

I know changed all the transistors small and large. Or pre drivers and drivers is the term used. Then the bridge rectifiers and finally it came down to the interconnect chip being bad. Can't remember for sure which one runs your solenoids.

KenLayton was there even a diagram available for this pin?

Schematic:

https://www.pinwiki.com/wiki/images/9/9f/Wonder_Wizard_schematic.pdf

Manual:

https://www.pinwiki.com/wiki/images/4/47/Sentinel_manual_better.pdf

See also the Star Explorer "Club" thread:

https://pinside.com/pinball/forum/topic/star-explorer-the-dont-get-no-respect-club

I will check this evening I might still have a couple of those interconnect chips in the tool box.

IC101 is on the display board. It controls the 1s and 10s digits and scoring. It is a type CD4093.

IC201 is the sound tones generator on the sound board. It is a type LM324.

Hello, I understand that this thread was created a year ago. Maybe there is some help out there. I wish to unseat my audio board to fix some rollover/bonus slot scoring problems (it does not score points). How were you able to unseat the boards as they are very tightly secured? Any recommendations would be appreciated.

General observation about Sentinel/Wonder Wizard machines: The wiring harness is a loose bundle of wires. You'd think the manufacturer could spend a few pennies for some zip ties to neaten up the harness like other pinball machine manufacturers.

In general, when I encounter "difficult" to remove boards mounted vertically, I *carefully* pry up the board with a screwdriver. Of course I first look to see if there are any screws/ties/studs/brackets that may need to be removed first before the board can be released.

Leo_T Instead of pulling up on the boards, I push up from the bottom using my fingers in a rocking motion. I was very nervous, but with a little patience and effort the board came out.

KenLayton
Ken you rock! I have been reading your responses to several of the Star Explorer posts. Thank you for your patience and friendly replies.

My son discovered the Star Explorer in his Grandfather's shed over the summer that must have been there for 35 years. It has been a great project for us, especially him. He has learned about soldiering and electronics. We have done many of the recommended changes on this post and 2 others. Now, we have hit a brick wall.

What areas should make sound?

Currently, we have sound being triggered from metal rollover contact strip of the Bonus strip on the far top left side of the playing field and the Bonus hole. However, we do not have any sound from the top 2 metal rollover contact strips in the playing. These contact strips do trigger the points counter, just no sound. We have replaced the IC202. Do you have any other suggestions?

Thanks,
Ken

IC 201, IC 203, and IC 204 are chips relating to sounds generation. You might try replacing them.

Where is the interconnect chip?

How does one go about replacing this with a fuse ?

Radio Shack # 2700739 fuseholder and Radio Shack # 2701024 Fuse, 2.5 amp slo-blo are the parts.

These little black guys are IC chips and should numbered as KenLayton said IC 201,203,204 are related to sounds. Others will be for solenoids. I will look at print and see if I can tell which are for solenoids. Hard to read this print as it is old and I am still noobish!

pasted_image (resized).png

KenLayton please correct me if I am wrong and school us with your knowledge and the correct answer!
I think these small ones indicated in red are logic gates which I think are a smaller ic chip and would all be Identified with the same # IC101.
As for the IC chip 106 which I believe is for the solenoids would be indicated in blue.
I might be wrong, as I am trying to learn here as well.

pasted_image (resized).png

IC106 drives the outhole ball return coil.

All other coils are operated by their respective switches which in turn operate the driver transistors (no ICs are involved for those coils as well as the flippers).