Star Trek SOS won't boot.

[Sinistar]

Right so th readings were whacked because the audio was not connected. Why is that, I wonder.

Plugging it all back up and watching it, i see the 10a slow blowing every time.

 

[Sinistar]

The header pins on the ac in look a little burnt.

 

[Muel]

Does it blow the fuse with nothing at all plugged into the PS?

There are 3 connectors if I remember correctly. Does it blow the fuse regardless or when you plug in one of the connectors?

Right so th readings were whacked because the audio was not connected. Why is that, I wonder.

Plugging it all back up and watching it, i see the 10a slow blowing every time.

 

[Sinistar]

Well it blows it without the audio hooked up. The only other things plugged in are the ac in and the connector that would normally plug into the cage.

 

[Sinistar]

The caps all look good actually. And it does look ll this psu was rebuilt once before- probably about 15 yrs ago.

 

[Sinistar]

Oh btw if anyone is reading this thread that knows of someone who would/could rebuild this psu, please pm me. Would love to keep this baby all original.

 

[Muel]

Okay, if you now have your PS out and are taking a good look at it... underneath is where all the good stuff is at. You'll see what I'm talking about, you might find your bad part there and not on top of the board.

Here, check out this Billtronix link, scroll down half a page.

http://www.biltronix.com/Star_Trek_06.html

A complete PS rebuild is a little bit more extensive than most linear power supplies on this one.

If you haven't checked out the transistors that would be my next stop.

You can also probably get these parts at Jameco.com

The caps all look good actually. And it does look ll this psu was rebuilt once before- probably about 15 yrs ago.

 

[SaminVA]

Oh btw if anyone is reading this thread that knows of someone who would/could rebuild this psu, please pm me. Would love to keep this baby all original.

You might send Hans O (p1001) a PM. He might have one for sale, take yours in on trade or repair yours.
http://forums.arcade-museum.com/showpost.php?p=1280492&postcount=4

 

[Sinistar]

Been a few mos but got the psu fixed! Thank you oryk zinyo! One step closer...

Installed it and powered up and heres what I'm getting in the pics below.

I can see it going through the startup, but I hear nothing yet either.

The wiring on this things looks afu too. So its very possible something could be mis wired. But figured id check in and see I this is an easy one.

 

[Sinistar]

Bumping this, cmon star trekkers help me out here, these boards were restored by Perfidious, supposed to be %100 working. Why might I be seeing garbage here and getting no sound?

 

[SaminVA]

Well I see the pictures and something's not right but you already know that. If oryk zinyo fixed the power supply I am sure he tested the audio amp. You might try and make sure you have all the plugs and cables plugged in correctly. It's easy to connect them backwards. Also check the ribbon cable between the XY control and timing boards, the pins can bend easy and break off so be careful. Make sure you have the audio in and out plugs going to the power supply connected correctly. When the game powers up you should hear the Star Trek music even if something's wrong with the monitor. From the pictures You cant tell if the game is even booting up. I have seen the monitor draw random color lines with curves from a board with a bad CPU so at this point it could be anything. Are the lines on the monitor stationary or are they moving around. Some video might help. Were the boards tested in the card cage that's in your game? or did you get the boards loose and install them in your games cage. Might be dust or dirt in the back pane slots. Check the power connector that plugs into the bottom of the cage that goes to the back pane, is that plugged in the correct way? What happens when you push the red test button? Will it go into test mode? Test mode is explained in the manual.
That's all I can think of for now.

 

[Sinistar]

Thanks Sam!

I know its booting (video would help) because I can coin up, see it go through the start (the beats of the start, cant make out much) and then the buttons- especially shields makes the monitor go all crazy in game.

I am thinking its a connection, but not sure where.

 

[That80sGuy]

If its coining up and you can hear it play..the problem is either in the video output circuits OR the monitor needs a rebuild. Make sure your ground straps are all in place.

 

[SaminVA]

That80sGuy is correct, if the game is coining up then the CPU is working but you should still have sound, make sure you have the volume control turned up and check the audio in and out plugs on the power supply. It's real easy to get them reversed and backwards. Try putting it in test mode and see if you have any readable video. If so it should tell you if theirs any bad ROMs or RAMs. Check the XY board connections and try reseating them in the cage again. You could still have a monitor problem. Keep digging, you will get it sorted out.
Some video would still help.

 

[kstillin]

ummm

Check and see if you plugged the 6-pin connector to the monitor in upside down.

or if the input protection board is plugged into the deflection board upside down.

Better yet, plug the 6-pin monitor connector directly into the deflection board (the right way).

 

[Muel]

Any luck?

Are you getting any sound yet?

..also, check your ground straps with a meter to see if they are really gounded.

You should also check the voltage to the monitor to see if it is in spec (should be, you just had your PS rebuilt) It looks more like you're having a monitor issue.

If you had (or have access to) a scope, it would be really easy to see if the board(s) are at fault or if it's wiring or the Electrohome G08.

Fingers are crossed for you!!

Good Luck!

 

[Biltronix]

Check for -5V at the power supply and if you can, at the cage/boards.

One time, my power supply (before the rebuild) had 3-pin sockets connecting the regulator chip pins to the wires that go to the psu pcb. Due to age (oxidation), one of the terminals of the socket was contacting properly and the result was a loss of -5V. During the rebuild, I removed the sockets and soldered the wires to the regulators directly and insulated them with heatshrink tubing.

The -5V supply being absent will prevent all sounds from working and it does odd things to the graphics. In my case, the image was rotated 45 degrees, was jumpy, and some vectors were incorrect or missing. Otherwise, the game played just fine.

Restoring the -5V fixed everything.

Bill B.

 

[Sinistar]

Thank you guys, some great suggestions there! Going to go through each one and check it off the list- will report back here as soon as I find out anything.

This one sure is a puzzle, but man it'll be worth it, this is one of my favorite games of all time.