Arcade Collecting > Pinball
STTNG electrical problems (switches/opto's)
Cenobyte:
Ok, did some testing tonight, here it comes.
--- Quote from: smartbomb2084 on June 08, 2011, 06:12:06 pm ---...Your problem seems to be with switch Column 3.
When you enter SWITCH EDGES test do all of the switches in Col 3 immediately close in rapid succession one right after the other?
--- End quote ---
No, the switches stay exactly the way they appear when I open the Switch Edges screen, like shown on the attached photo.
--- Quote from: pinballjim on June 06, 2011, 02:15:56 pm ---With the game off, unplug the connector that is associated with column 3.
Turn it on, go into test mode. Do you still have a stuck column? Then you've got a board problem.
--- End quote ---
As you can see on the picture, I don't seem to have a stuck column. It's a (random?) selection of switches, some of them closed, but I'm not sure which of them are supposed to be closed and which do not.
I disconnected column 3 and column 4 on the 16-opto board (with machine off) and the Switch Edges screen stayed the same after turning the pin back on.
I also looked for misplaced connectors, but the only misplaced connector was a J137 and J138 that were switched and that would not make a difference in my opinion. All other connectors are on the right place.
I also was able to get the machine "playing" by only inserting one ball to prevent a pile up in front of the plunger and I noticed that the machine still resets when lots of plungers fire simultaneously.
When the driver board was repaired, these components were replaced:
-C5, C30, C8
-BR1, BR2
-GI headers
A full test in another pinball (Fish Tales if I'm correct) showed that the driver board was functioning perfectly after that.
smartbomb2084:
First off... Remember that in Switch Edges Test, optos show up as CLOSED on the display (square) when they are actually OPEN. The exact opposite of a mechanical switch.
With no balls in the game and in Switch Edges Test the following switches should have squares on the display at idle:
Sw 24 - ALWAYS CLOSED
All of Column 3
All of Column 4
All of Column 6 except Switch 68 ( shooter)
Sw 95 and 97 (Right and Left gun home) With guns connected
Why is switch 45 closed (dot not square) ?
Switch 57 should be open (dot) but it is likely closed because the Top Drop Target is Down.
Are you absolutely sure the Green/Orange wire from CPU J207-3 to 16 opto Board J5-10 (Column 3) is intact?
Cenobyte:
After some nights of eliminating things, we ended up replacing all four LM339's on the opto board and the Star Trek is back to health. God, I missed that machine ;D
Since this is the second time I had problems with the 16-opto PCB board (first time we switched out the board with another machine), I was wondering: is there's something that might be responsible for destroying these IC's?
smartbomb2084:
That is good news.
I would be looking for 50V (more like 70V) coil power that may be intermittently touching one of the opto wires connected to J1-J2-J3 or J4 of your 16 opto board taking out the LM339's. Since they don't blow immediately, playing the game may vibrate some bared wire(s). Take your time and check everywhere.
Cenobyte:
--- Quote from: smartbomb2084 on July 06, 2011, 09:29:59 am ---That is good news.
I would be looking for 50V (more like 70V) coil power that may be intermittently touching one of the opto wires connected to J1-J2-J3 or J4 of your 16 opto board taking out the LM339's. Since they don't blow immediately, playing the game may vibrate some bared wire(s). Take your time and check everywhere.
--- End quote ---
Well, it looks like I cheered too soon...
The problems keep coming back intermittently now. I guess the LM339's are still intact (since it sometimes functions perfectly without any errors on startup) but it keeps doing strange things: switches that do not work one moment and DO work the next moment. Cannons constantly turning one time and doing all right the next..
Oke, back to playing the detective again ;D
But first fix a defective coil (and mosfet?) in my Stargate :lol
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