Door Sensor Bypass Switch Installation FAQ
by Loafy23

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Unless you've shelled out the bucks for a no-swap (MOD) chip, you've probably just wedged something between the door of your PSX and the door sensor so that the PSX thinks it's closed and you can use one of the various swap methods. Although this is the cheapest solution, it's also the worst solution. The problem lies in the fact that the door is never closed. This allows dust, smoke, and any other foreign particles to enter your PSX get into the mechanism moving the laser and coating the optics of the laser with a film causing mis-reads which then have to be re-read, making the PSX work harder and slowing down your gaming fun. You also have a higher chance of someone spilling something into the PSX. We all know how much that would suck! 

Here is what _I_ did to alleviate the problems stated above. I'm not telling you to do this, so don't send me e-mail telling me that you messed up your PSX and that it's my fault. This is just an example of what you can do. First of all I should tell you that I'm not the least bit afraid of opening up the case on the PSX. I've got the experience and it's not something for me to be afraid of. This is a fairly simple procedure though that requires a little common sense (to know what you are capable of,) basic soldering skills, a micro toggle switch, some light weight wire (26 - 30 gauge,) a drill and bit, and a Philips head screw driver. 

If you are going to attempt this procedure DO NOT force anything. If something does not come free easily, you probably missed a screw or something. Above all, take your time, and make notes of what you've done so as to be able to reverse whatever you do. Video tape it if you can. 

First I removed any disk that might be in the PSX and disconnected everything from the PSX. Especially the POWER cord! At this point find a nice table to work on, a good light source, and a towel to lay the PSX on so it doesn't get scratched up. Turn the PSX over and remove the screws from the bottom of the case. Then simply remove the upper part of the PSX by gently lifting it off after carefully turning the PSX back over. To remove the drive assembly, grasp the plug (I think it had four wires on it) and gently pull it off the motherboard (mb.) Then remove the data cable (a ribbon cable that kinda looks like MYLAR) from the mb by lifting the two tabs on the ends of the connector on the mb and then gently pull the cable free. Once this is done, the whole drive assembly just simply lifts out. Next, pull the power supply cable from the mb and then remove the screws that attach the mb and controller/mem card ports to the bottom of the case. When this is done the whole mb should lift out. Now find the switch that is the door sensor. It's near the back of the board and is situated under where the button is in the CDRom compartment. This is pretty easily found. The next step is to find where the switch is soldered to the board on the bottom of the mb. It connects with four solder joints, two on either side of the switch. Then solder two pieces of wire (approximately 8 in. in length) to these solder joints on the mb and then to each side of the toggle switch. It doesn't make any difference which individual solder point of each pair of solder joints you solder to. Each pair is electrically the same point. There just has to be one wire attached to each side of the switch. When the switch is closed, the PSX thinks that the door is closed, no matter what position the door is actually in. When the switch is open, the door sensor functions normally. This next step is the hardest thing to do. You need to drill a hole in the top of the PSX case for the toggle switch. There has to be enough clearance under the toggle so the case can be put back together and the switch is touching nothing but the plastic of the case. There is a little niche on the right side on the metal support for the mb that is large enough for the switch. This niche is about two inches from the back on the right side. Measure the top of the case and then drill a hole of the correct size. Reassemble the PSX reversing the steps above, routing the new toggle switch wire so it doesn't interfere with anything. Double check all connections to make sure that everything is connected correctly and install the switch into the hole in the top and screw the top of the case to the bottom 

During the re-assembly I made sure that when the switch is closed, it was toggled towards the front of the PSX. This really didn't make a difference in how it worked but I wanted it to correspond to the door position. Forward being closed. 

When I want the door to work normally, I just toggle the switch to the back position. I use the audio swap method since I have an older PSX. With the toggle switch in the normal position I open the door, turn on the PSX, and select CD Player. I then insert a PSX disk (I use DDerby for my swap disk) and flip the toggle forward to the closed position. The disk will spin up and then stop when the PSX has loaded in the audio (and territory) data. Then I remove the DDerby disk and insert one of my imports, close the door, and exit the CD Player menu. The game then loads and I get to play my imports. The toggle switch can now be set to the normal position. 

It took about 25 minutes for me to complete this procedure and the parts are readily available at yer local Radio Shack. I used a 12watt Weller soldering iron and KRYNAR wire but any 25watt or lower soldering iron and light weight wire can be used. 

This works wonderfully and I'm _very_ happy with the way it turned out. Once it's all together you can swap your disks and not worry about stuff getting into the constantly open door. Have fun and good luck with the install.

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