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(Topic ID: 183403)

Time Warp blowing F2 fuse when powered on

By boostedskex

7 years ago


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#18 5 years ago
 
JON

Schwaggs

Gameroom Mods

10y 105K 4,760 10

OP
Quoted from boostedskex:

Update - With a good fuse in F2 and the 2J9 plug unplugged - game powers on and boots up. new game will start. The sling shots, drop targets and right saucer coils are working. The upper saucer, flipper coils and music (sounds) are not working.
If i press the test button on the sound board I do get the forever repeating sounds until the game is powered off.

Remove F2 - boot the machine up - carefully reinsert F2 using an insulated tool after the game is in attract.

If the fuse DOES NOT blow, you probably have a problem with the blanking circuit.

If it does blow, you need to keep looking for a locked on coil or shorted driver transistor.

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#22 5 years ago
 
JON

Schwaggs

Gameroom Mods

10y 105K 4,760 10

Sounds like you have a shorted transistor on your hands which is by far, easier to find and fix.

Pull the driver board from the machine. Using the diode test function on your meter, test all the large transistors on the left side of the board. You are not looking for specific numbers. You are trying to find the transistor(s) that measures significantly different than its neighbors.

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#24 5 years ago
 
JON

Schwaggs

Gameroom Mods

10y 105K 4,760 10

Quoted from Cycloneman:

wouldnt it be easier to place black probe to ground(backbox grey strap)and red red probe on the tab of transistor.if meter beeps that transistor is shorted

I've never tested them that way but I don't see why that wouldn't work!

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#28 5 years ago
 
JON

Schwaggs

Gameroom Mods

10y 105K 4,760 10

OP
Quoted from boostedskex:

I replaced that transistor and pre-driver and reinstalled the board.
Now when I turn the game on it does not boot up. All GI illuminates and the displays are not showing anything. Does this make any sense, where should I turn now?

Make sure you have a couple mounting screws in each board. That helps with the ground plane.

Try pulling the 40 pin apart and back together. Make sure the back of the CPU board is in the bracket slot correctly and the 40 pin solder pads are not touching the bracket. If you push them together too hard, sometimes the boards can short to the mounting bracket.

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