bclark
Well-known member
Can someone post me a link on where I can get a replacement? The one that is in there died and I dont know which one I need to get for 720. Thanks guys!
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Do you care if it's specifically "Peter Chou"? If not,
15 Amp Standard Switching Power Supply $25.00
http://www.therealbobroberts.net/parts.html
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are you sure it's dead? sometimes they'll go into overcurrent protection cause the +5 adjustment pot's covered in shit and needs to be wiped. I've seen this happen a few times before, which is why I do it for preventative maintenance on ALL video games in our arcade now.
disconnect all the wiring that goes to the game's edge connector (leave all the AC wiring attached) from the power supply. using alligator clips, borrow a working coin door light fixture and hook one lead on the fixture to the +5 lug and the other to the COMmon ground lug. this will place a 5 volt load on the power supply and not burn it out on you for sure.
now turn the +5 adjustment pot completely from one extreme to the other a few good times. return it to the center position. power the cabinet and get your digital multimeter out, set to 20V DC, and probe the +5 and COM lugs, adjust the +5 knob to about 5.10-5.15 volts.
for added measure, turn the knob up, find out what your power supply's max output is still. if you can't get it above 5.4V, then chances are it is in fact no good. and if you're in a situation where you have the +5 knob turned down and it's still outputting a high voltage (it SHOULD go as low as about 4.85V) then the unit is officially no good and you will need a new one, as already linked above.
good luck. I need to add this as a sticky to my blog.
This will work fine as a replacement. Do NOT hook up the sense lines, leave them hanging if you go this route.
Atari System II's are a little different when it comes to power. There is no edge connector at all. The +5vdc comes from two different sources too. The switcher can be tested as you have described by removing the game wiring to the +5vdc on the switcher and adding a lamp to the +5vdc of the switcher.
Sense lines?
720 has 6 wires going to the switching power supply.
1. +sense
2. +5vdc
3. +5vdc
4. Gnd
5. Gnd
6. -sense
I have my +sense bridged with +5 and - sense bridged with - 5 with no issues.
You can safely remove them if you no longer have the original power supply
Just curious why you need them in the first place then.