Used wrong PS on Atari 800 11v

[NML32]

I'm so mad at myself right now. I just bought an Atari 800 along with a 5200 and some other odds and ends off of Craig's list. To make a long story short I grabbed the 5200 ps and now the 800 will not turn on anymore. This is no surprise to me, I am wondering if there is anything I can do to fix it? Also before I used the wrong ps it booted up but the KB did not work. That is another issue.

 

Are there any fuses in the 800?

[atariksi]

I'm so mad at myself right now. I just bought an Atari 800 along with a 5200 and some other odds and ends off of Craig's list. To make a long story short I grabbed the 5200 ps and now the 800 will not turn on anymore. This is no surprise to me, I am wondering if there is anything I can do to fix it? Also before I used the wrong ps it booted up but the KB did not work. That is another issue.

 

Are there any fuses in the 800?

 

Atari 800 takes 9vac so 9vdc probably would not have harmed it +/- a volt or two. However, Atari 5200 adapters I have measured read like 14VDC or more although they are labels 9.3vdc or 11vdc. One approach would be to get another Atari 800 and replace the power unit to narrow down the problem.

[sup8pdct]

No. there are at least 3 voltage regulators. a 7805, 7812 and a circuit that gets -5V from the AC input. All 3 are required by the ram chips the 800 uses. There is a diode pump along with 2 capactors to get the requided voltage for the 7812. a similar setup is used to get -5 volts

The power led is powered by the -5V rail. When using the proper power supply unit, does the power led come on? If not, check to componants for the -5v supply. Here is a schematic of the 800 power supply board.

 

james

 

 

 

 

I'm so mad at myself right now. I just bought an Atari 800 along with a 5200 and some other odds and ends off of Craig's list. To make a long story short I grabbed the 5200 ps and now the 800 will not turn on anymore. This is no surprise to me, I am wondering if there is anything I can do to fix it? Also before I used the wrong ps it booted up but the KB did not work. That is another issue.

 

Are there any fuses in the 800?

[NML32]

No. there are at least 3 voltage regulators. a 7805, 7812 and a circuit that gets -5V from the AC input. All 3 are required by the ram chips the 800 uses. There is a diode pump along with 2 capactors to get the requided voltage for the 7812. a similar setup is used to get -5 volts

The power led is powered by the -5V rail. When using the proper power supply unit, does the power led come on? If not, check to componants for the -5v supply. Here is a schematic of the 800 power supply board.

 

james

 

 

 

 

I'm so mad at myself right now. I just bought an Atari 800 along with a 5200 and some other odds and ends off of Craig's list. To make a long story short I grabbed the 5200 ps and now the 800 will not turn on anymore. This is no surprise to me, I am wondering if there is anything I can do to fix it? Also before I used the wrong ps it booted up but the KB did not work. That is another issue.

 

Are there any fuses in the 800?

Thanks This may be beyond my abilities but I am going to try to fix my 800. Maybe I can find a local repair shop that may be able to help.