Please help me get audio on Scramble. (Wiring harness issue.)

There is an orange wire, which is disconnected from the harness. The wire to 12v on the power supply is also orange. When I'm in diode mode (I looked it up), and I touch the multmeter leads to 12v on the power supply, and pin one on the harness, I get a quick readout (last time it was like 1400).

Should I attach the disconnected orange wire to the ground on the harness, and just see what happens? :001_ssuprised:
 
Last edited:
Just connect one end of the DDM lead to the disconnected orange wire, and the other to 12v on the PSU. That will tell you if you have the right wire.
 
Yes, I am getting a reading on the disconnected orange wire! :D However, the disconnected blue wire is also registering at several points on the power supply (both AC, -5, 5v and at 12v).
 
Last edited:
Can anyone tell me where to these loose connections need to be soldered on the harness? I'm so close to having this thing working! Could I short anything out if I just touched the orange wire to a pin, and see if I started getting sound?
 
Last edited:
If you did everything right then the free orange wire goes to pin 1 on the harness.

If there is a wire already soldered to pin 1, don't do anything.

Don't touch the blue wire, your DMM should not register a 1 at all those points.
 
I have a question. Could you take a Better Photo of your Harness connector? Like right from the back side where all of the wires are.

I have a feeling the 2 wires you have broke off are A1 and B1
A1 is +12 Orange
B1 is -5 Blue
Looking at your first photo it looks to me that there are 2 broke off connections on the far left side of the photo. But I want a better pic to be sure.
And IF the Blue IS B1 -5 you will see some readings back at the power supply.
 
Here's what I'm working with.

powersupply_zpsx2rcqnsh.jpg


pscu_zpsk2mrxn69.jpg

It looks to me like you have, going from bottom near fuse, Ac, Ac, Fg, -5, +12, gnd, and +5. Also looks like the +12 terminal is under that cap.
 
He says that the blue wire is connected to several points on the harness. That sounds scary to me.

I would personally re-do the entire harness if that's what I came up with.
 
I have a question. Could you take a Better Photo of your Harness connector? Like right from the back side where all of the wires are.

I have a feeling the 2 wires you have broke off are A1 and B1
A1 is +12 Orange
B1 is -5 Blue
Looking at your first photo it looks to me that there are 2 broke off connections on the far left side of the photo. But I want a better pic to be sure.
And IF the Blue IS B1 -5 you will see some readings back at the power supply.

Here's a close-up of it. You can see that at the 10th and 11th pins in from the left, there is a little bit of solder. That's why I was thinking that those wires came off of those pins.


scrambleharness_zpslzzt4jgl.jpg


harness2_zps9tczzhiq.jpg
 
Last edited:
So should I pop orange in A1 and blue in B1? On closer examination, the pins are still soldered to the wires. I hope that I don't sound too clueless here; I just don't want to do anything dumb.
 
Last edited:
Be CAUTIOUS to know where A1 and B1 are at. If you get them upside down you will Fry shit.

I would "think" A1 would be the Parts side of the board and B1 is the Solder side, But before you Just "do it" Please get conformation if I am correct or not.
 
Be CAUTIOUS to know where A1 and B1 are at. If you get them upside down you will Fry shit.

I would "think" A1 would be the Parts side of the board and B1 is the Solder side, But before you Just "do it" Please get conformation if I am correct or not.

The parts side of the harness shows numbers, and the solder side shows letters. Thus, "A" is on the bottom of the harness:

12
AB

So, "1" and "A" are the unoccupied slots.

Any advice? I have an extra board, in case anything fries.
 
Last edited:
Nobody wants you to take a gamble and fry a perfectly working board.

You need to be sure before you power anything up.
 
The back of the Harness Should be labeled, and even if it is not, look at the Schematics for the game find the next wire over to the one you think is A1 (Should be A2) and see whare it leads in the harness. if it matches you have your position.

Also EDIT on MY part.

According to the schematics
A1 is -5
B1 is +12

I may have told you incorrectly.

http://www.arcade-museum.com/manuals-videogames/S/Scramble.pdf

Here is a link to the Schematics for Scramble. Look at Page 8 for the harness pinouts. It is top left side Looks like a bunch of Long Circles with numbers.

Looks like A3 is P1 Shoot But I think it should read P2 Shoot 1 (May be a typo) A4 is P2 Left. So if you can trace those 2 wires to one side of the harness You Know for sure where A1 is located then, its on the same side.
 
Last edited:
firstly you need to try to find the parts VS solder side of the connector.
i believe you have found the orange is +12 correct??
set your DMM to continuity and probe from pin 5 to your 1 player start (the hot side not the ground side) and see if it beeps.
if it does beep that is your SOLDER side and the +5 goes on that side.
IF it does not beep, probe your 2 player start button(the hot side not the ground side) , if it beeps that is your PARTS SIDE and the +12 goes on that side. once you figure out parts VS solder side take a sharpie and mark the side for future ,

second you need to find what V is on those two wires. set your DMM to VDC black to ground and red one at a time to the blue wire and then the orange. i would not use the monitor frame for ground , i would try to use the ground on the PS.
you keep mentioning touching or soldering those to ground. those two wires are either +12 & -5 or +5 & +5 either way NEITHER of them should be grounded! your going to fry fuses or your PS if you try that.

please post back your result.
 
Last edited:
Here is another piece of the puzzle: Those slots are totally empty on the other side of the harness. There is no metal connection at all. It's just vacant space.
 

Attachments

  • harness2_zps9tczzhiq.jpg
    harness2_zps9tczzhiq.jpg
    176 KB · Views: 8
Back
Top Bottom