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I finally got finished with my FB2 Rev B menu button (aka soft reset) mod. This mod allows you to go back to the game selection menu without toggling the power button. This mod is completely independent of the cartridge mod. It can be added in addition to the cartridge mod, or as a standalone mod without the cartridge.
I've been playing with my FB2 both before and after this mod, and I must say the overall experience is much nicer with the mod. I really love being able to quickly go back and select a different game. Not that it's difficult to cycle the power button, but this just seems more polished to me.
OK, so let's get to work!
You will need the following items:
A momentary contact SPST pushbutton switch
Some small guage wire (26 - 30 AWG will work best)
A soldering iron and some solder
Some hand tools like a screwdriver, file, drill and drill bits
You will need to take the FB2 apart by removing 5 screws from the bottom. One screw is in the center under the white label. You will also have to break the warranty seal to open the unit. Once you have it open, remove the main circuit board from the top cover by taking out all the small screws. You will also have to remove the screws from the two smaller circuit boards that hold the power and difficulty switches. You will be soldering two wires to the main circuit board on the bottom (green) side. Once you have it apart, you can start by preparing the switch and mounting it in the case.
I had a switch that was leftover from another project. I think I ordered it from MCM electronics some time ago. This is what it looked like in the package:

IMG 4165

This is the switch taken out of the package:

IMG 4127

Next you will need to solder two wires to the switch terminals. You can use the same color wire for both since polarity doesn't matter here.

IMG 4153

I used some heat shrink tubing to cover the solder connections and add some strain relief. This step is optional.

IMG 4154

 

Next, you will need to make a hole to mount the switch. I chose the left front edge of the top cover. I used a smaller drill bit, then finished the hole with a hand file.

IMG 4156

 

Here is a close up of the hole:

IMG 4158

 

Here is the switch mounted in the top cover:

IMG 4160

 

And a look from the underside of the top cover with the switch in place:

IMG 4161

 

I had to file a small relief area in the bottom cover so the switch would fit when it was all put together:

IMG 4175

 

Next you need to find the correct points on the circuit board to solder the two wires to. Look for a zero ohm jumper resistor marked J19 to the left of U2 (the ROM chip that's under the big black blob near the top edge of the board.) You can solder the first wire to either side of J19 as both sides are connected to ground. The second wire from the switch will connect to a round pad just above C10. Take a look at the two photos below. The second one is a close up of the board. The two points you need to solder to are marked in red in both images.

IMG 4145 edit

IMG 4141 edit

Here is what mine looked like after I soldered both wires in the correct place. It would be a good idea to glue or tape these wires down to the board for strain relief. You can use hot melt glue or electrical tape. Just be careful of the placement so the wires don't interfere with any switches or buttons when you put it back together.

IMG 4182

Now put everything back together and test it out. The FB2 should power-up normally and show the game select menu on the screen. Once you select a game, you can now go back to the menu by pressing the new button you just installed!
Here is my unit fully assembled with the new menu button.

IMG 4187

IMG 4178

 

I plan to add some lettering above the button that says "MENU" at some point. But it's functional for now so I'm just going to play some games instead and worry about that later.

I would love to hear any constructive feedback or suggestions.

 

Thanks,

Dave

 

 

 

 

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Fantastic! Thanks for documenting this mod (that Curt has teased us about for years!) and showing folks how to do it. Even better since I have the save revision board in my FB2. I will definitely give this a try in the coming months.

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I didn't know this was found so long ago! Mine is untested, but I think this is correct!

I had just posted my findings, and this picture:

gallery_29575_1457_170483.jpg

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Hi,

 

Yes, yours is correct for a legitimate PCB ( as you show posted). The pics I had shown are of a "bootleg" PCB thr R3 is in a different location and I just used the nearest ground pad in place of your J19.

Thanks for your posts, they helped me find the correct locations for my "Kroger fake FB2"

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Thanks so much for this guide! I think I had a Rev B FB2 as well, as it looked the same as in the illustrations. I hadn't soldered in years, and I am a novice at this, but it was quite easy and also a fun small project to do in the evening. I just had to keep my hands steady when soldering, and it was useful to have one of those "helping hands" tools that you can get from electronics stores (like the Source in Canada).

 

My push button is not the best looking, it protrudes too much so I may swap it out with another one in the future. But it does the job! See my work attached.

post-47549-0-64116300-1474174469_thumb.jpg

Edited by rednakes1

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Just an update on my soft reset mod. I changed the momentary push button (SPST) to part number 30-146 by Philmore, which was available at my local electronics parts store. Here's a couple of pictures attached.

post-47549-0-00255900-1475289789_thumb.jpg

post-47549-0-96289900-1475289951_thumb.jpg

Edited by rednakes1
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