Ps1 memory card slots not working

Hello ,
I hope someone have some tips for me.
I am trying too fix a ps1 5502 serie system
At first the controller port wasnt working.

Now i fixed that, by removing fuse ps605, and replaced it with a resistor.
Booted it up, and the controllers where working, except the memory cards slots.
Tested the menory card on a different system, and ita working, so i know thats not the problem.

Does somebody know which fuses are also used for the memory card ports?

 

A resistor isn't a fuse.

I've had a similar problem with another PS1 and if you look at the schematics the memory cards and controller ports share the same basic wiring with only a wire difference if memory serves. So if one breaks both should break. Could be a memory slot issue.

 

Use a fuse not a resistor

 

That will be the problem?
cause it does the same thing right?
except a fuse will blow, if it goes beyond a certain amount?

btw, i bridged the point with a wire, just too test it out, and now the memory card slot and controllers work.
so, could it be that it was a way too low resistor?

 

You still have to install a fuse.

 

See a fuse like a 0 ohm resistor if you wish but with an abnormal low tolerance to temperature. If too much power flows through it, it'll heat up and blow.

So a standard resistor will not do the job here as it will probably just heat up a lot without burning and then you'll end up burning your power source because it'll output a degree of power superior to it's normal operation mode.

So to summarize, never replace a fuse with a resistor. Replace it with a fuse and if it blows up again then you'll have saved your power supply from degradation; what a resistor wouldn't prevent.

 

Why you want install a resistor? bah
A fuse must replaced with fuse with equal value (see the number on it?)
Bridge and resistor (0 ohm type too) are the stupidest things to do, another short and say goodbye to your psx because the problem became too complex to resolve for you

 

ty for your explanation.

i got a replacement fuse at my local store, installed it, and its working now.

 

No problem. Just keep in mind that there is a possibility that it'll blow again. It blew out the first time for a reason. Fuses for such small power grades aren't really a concern when it comes to degradation over time.

Just compare how many time you replaced a fuse in your car because it just blew for no apparent reason, not many times I bet!

If it blows again and there is no apparent damage or short to the ports, then I would check the gear you plug in those ports. Maybe that's the cause of the failure. I've seen cables of old controllers that were so used the individual sleeve some wires were worn down and created a small short (it won't necessarly be 0 ohm but it'll be far less than what it's supposed to be).

So take note of what you plug in and if the fuse blow again, check the you controllers and memory cards.