Hi all , Missing sound fix .
My Gangbusters was missing one sound , which was the robber sound , i though it was one of the MFC 80-40's on the pre amp board, that had blown .
I tested for voltage on the pre amp connector , and the 'Robber' voltage was not their.
Turns out it was a blown 555 timer chip on the Amp board , I installed 2 sockets and 2 new 555 chips, , thought i would just replace both. game sounds are now fully working . Yes!!
I recommend putting new sockets in for the LM 354's also on the Amp board , because the original type are not great , This worked on mine. getting the Machine gun sound going again , as it was intermittent..

Yes still using the original 8 track tape player . I just cleaned the heads in it with some alcohol .

Some great information on Kens arcade page regarding the Sea Raider sounds.
http://www.rainfall.com/pinball1/machines/Midway-Sea-Raider/Midway-Sea-Raider.html.

searaid9 (resized).png

Thought i'd share some pictures of the Amp board work .
New sockets on both the LM 354's and both 555 timer chips were replaced and sockets fitted .
A bad LM socket was stopping the explosion and gun sound from working , fixed . ( The original sockets are outdated and can crack, as mine had )DSCF1604 (resized).JPGDSCF1600 (resized).JPG You might need slightly longers screws to refit the heatsink on the LM's .
A bad 555 timer chip was blown and stopping the 'robber' sound from being picked up from the pre amp board . fixed!
I also put new elec caps on all both the pe amp and amp board ...DSCF1606 (resized).JPGDSCF1607 (resized).JPG

I have found a LDR that works for the Gangbuster game , 170ohm light / 1.3Mohm dark
part no 466-1996 RS Components.
.http://au.rs-online.com/web/p/ldr-light-dependent-resistors/4661996/?sra=pstk
I replaced 5 today on my game that were not working and bingo! working again like they should.
Heres a link for the LDR's , these work great and are cheap compared with the hard to find originals ,
My game had only 3 or 4 sensors working , but all are working now after i replaced them with these

No worries mate , just remember to use a heat sink when soldering these in , try not to overheat the legs.
Hopefully RS components will post overseas ,as it's a Aussie based company.
If you have problems getting them , send me a message , I could always send some over .
Happy new year all...

Yes a real mix of EM and Early electronics , I found some of the relay contacts were hard to make work correctly , testing with meter helps.
The old edge connectors on the boards caused a few issues.
Was thinking of replacing these with the 'Gottlieb' style edge connectors.?? Opinions anyone? .
But for the moment the games is working 100%. I think.

The only issue now is the Car now scores 300 per hit , before i replaced all the LDR's it used to score 100 per hit.
The rest of the sensors on all other targets work fine, so i would love to hear if the Car should score 300 or 100???
Everyone that plays it loves the Game .

Gangbusters (8) (resized).JPG

Thanks yes ritch. my car scores 300 when it, i wasn't sure if that was the correct amount, Thanks for clearing that up cheers.