ARII popping Fuse and J6

[HudsonArcade]

Could be an internally shorted big blue, but that wouldn't account for no voltage on pin 6 & pin 7. I am thinking that your trans is bad.

Gee, do you think F4 and F5 being blown could *possibly* account for no voltage between 6 and 7 =-P

 

[vicjw66]

The pics did not look right so I checked the schematics for the power supply assembly from several different atari games (couldn't find ROTJ). I have to ask if you pulled anything off before you took the pics. For one, did you remove fuse F2? The schematics show that it leads to the Bridge Rectifier. Without it, no AC current to be rectified to DCv. Fuses F4 and F5 are not in circuit with the BR or filter capacitor. But that wouldn't matter because there's an empty spot at J3 where the voltage plug connector should be. This configuration of wires determines what the AC voltage from the outlet must be. (Note:the voltage plug connector should be configured for 120VAC) I hope power wasn't applied to this assembly with the wrong setup. Lastly, it looks like some wires are missing from the transformer block. Where did you get it from? Anyway, start with a new transformer, or better buy a whole new assembly.

 

[HighScoreSaves]

I think you're right. Here's the schematic -

AO37671-14

 

[HighScoreSaves]

 

[Dokert]

The pics did not look right so I checked the schematics for the power supply assembly from several different atari games (couldn't find ROTJ). I have to ask if you pulled anything off before you took the pics. For one, did you remove fuse F2? The schematics show that it leads to the Bridge Rectifier. Without it, no AC current to be rectified to DCv. Fuses F4 and F5 are not in circuit with the BR or filter capacitor. But that wouldn't matter because there's an empty spot at J3 where the voltage plug connector should be. This configuration of wires determines what the AC voltage from the outlet must be. (Note:the voltage plug connector should be configured for 120VAC) I hope power wasn't applied to this assembly with the wrong setup. Lastly, it looks like some wires are missing from the transformer block. Where did you get it from? Anyway, start with a new transformer, or better buy a whole new assembly.

You are correct, that he does not have the right power brick.

The missing fuse at F2 also explains the lack of voltage at J5 pins 1, 2, 3.

The input voltage selector being missing is not a big deal, because it doesn't look like the transformer itself is wired for it.

The negative side of big blue is tied to the center tap of the winding that is used for F4 & F5.

The obvious best solution is to try and find the correct power brick. Could you make this power brick work? Probably.

 

[Arcadenut]

Must be something in the Arizona Power I picked up a Centipede last week, just finished rebuilding the power brick and ARII. Powering up causes F4 and F5 to blow...

Haven't had time to diagnose it, but I'll post the progress here.

 

[Arcadenut]

ok, putting cap C18 in backwards WILL cause F4 and F5 to blow...