There is a bank of DIP switches on the motherboard which are not labelled up on the silkscreen and that are not the ones that switch between MVS and JAMMA. I am unable to find a manual that is in english for the Rev 2 boards so after a bit of asking about I have been reliably informed that the manual states these do absolutely nothing and are not used at all.
The Lethal Enforcers guns arrived today.
On testing I found that the RED gun aiming was off a little to the right and the BLUE gun didn’t register a shot on screen but it did register when the trigger was pressed.
I fixed the RED gun simply by removing and cleaning the lens.
When I opened the blue gun a few bits dropped out, the photo transistor and the spring that pushes the trigger back out.
The photo transistor had simply been dislodged.
I cleaned up the solder holes and resoldered the part back onto the small PCB.
I decided to give this lens a clean too as it had a big greasy fingerprint right on the middle of it.
The hardest part of this repair was getting the bloody spring back in place and to keep it there for long enought to put the gun back together. After a lot of bad noise I managed it. Ive taken a couple of pictures just in case anyone else needs to know how the spring actually goes back in.
I retested the guns and the RED one works perfectly but the BLUE one doesn’t register shots fired around the edges. This is usually a common problem with older monitors as their brightness fades over time and the guns fail to register the screen flash. I know this shouldn’t be a problem with mine but I also know that components degrade over time too. I removed the bezel glass from my cab as it is slightly tinted and the BLUE gun now works perfectly. I will probably order a new photo transistor at some point, or possibly a new glass bezel!
I decided to take a look at the Lethal Enforcers board I recently bought as it had no sound.
There are many accounts of people with this problem on the forums for this board and the X-Men board, they use the same IC.
I found an excellent post over on the KLOV forums here and decided to see what I could do.
I scraped away the resin around the capacitors and with my multimeter checked continuity following the diagram user tkrn had posted in the above thread.
Capacitor C6 had leaked a little and had corroded the track between the positive side and the first pin of the 3 pin IC next to it. I removed the capacitor with a set on small pliers, it came off very easily, and replaced it plus I bridged the corroded track too.
Fired the board up and full sound is back. I haven’t replaced any of the other capacitors yet as its working but when I take this board out and store it I will probably do so just for the sake of longevity.
Many thanks to tkrn over at the KLOV forums for his excellent post, without it I wouldn’t have attempted this fix.
Symptom: No RGB output
Cure: Traced the Red signal back to pin 6 on an LS32 (IC57) on video board, it was dead. socketed and replaced the IC and everything is back
Note: This was a (Super) Bobble Bobble bootleg board but I think the majority of the layout etc is the same
Had this original Commando board for a while now but never been bothered to make an adapter up for it. Even though it may look like the JAMMA pinout, it isnt.
The original fault was garbage on screen
It turns out that in the back on the manual (found on the net) are the schematics for this board and they are nicely split into relevant sections too. After a little while of following them through I started checking the relevant inputs and outputs of the associated TTL.
I found a 74LS74 with a couple of dead pins which I removed and tested again in the Chipmaster
Fired the game up again and the backgrounds were now clear but there was still some garbage. After a little more probing I found a 74LS138 with a dead output
Replaced this and tested, the game now works fine and it also ended up being the Japanese version of the game, Senjou no Ookami.
The screen is a little off centre but this is due to my CGA – VGA adapter not being setup properly for the game.