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Hi Roxbury,

 

it keeps looping on the self test and it's not a dip switch setting.....

 

was hoping to read about common probs with this model in case it was a common problem possibly age related?

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Could be a lot of things, ranging from easy fixes to complicated. It is either power supply or PCB issue.

 

Pics of the cab and internals will help with context.

 

Easy things to check first:

 

* Check the voltage getting to the chips on the far end of the PCB (opposite end to edge connector). Should be around 5v. if it is a bit low (say 4.5v), dialling the 5v power supply up a little carefully might help.

* If your voltages are good, remove the PCB from the cabinet and carefully reseat any ribbon connectors, and reseat any socketed chips carefully. Clean the edge connector on the PCB as well.

* Try the PCB in another cabinet or on a test rig (may need to get another local member to help with this).

* If you still have problems after this, it is likely a PCB problem which is a whole other world of troubleshooting. Looking for repair logs either here or on other sites could help, learning arcade PCB repair takes a lot of time and effort if you want to try. Not sure if you have any knowledge in these areas, but if the basic attempts above don't work it is probably PCB repair time. Starting a PCB repair thread may get some responses from knowledgeable members here.

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Roxbury I am on an island off the tassie south coast

 

- - - Updated - - -

 

Xevious has a test switch somewhere in the cabinet, if that is left set to "on" the board will always be in test mode and will loop through the tests endlessly.

 

nah...not the dip switch.

 

- - - Updated - - -

 

Could be a lot of things, ranging from easy fixes to complicated. It is either power supply or PCB issue.

 

Pics of the cab and internals will help with context.

 

Easy things to check first:

 

* Check the voltage getting to the chips on the far end of the PCB (opposite end to edge connector). Should be around 5v. if it is a bit low (say 4.5v), dialling the 5v power supply up a little carefully might help.

* If your voltages are good, remove the PCB from the cabinet and carefully reseat any ribbon connectors, and reseat any socketed chips carefully. Clean the edge connector on the PCB as well.

* Try the PCB in another cabinet or on a test rig (may need to get another local member to help with this).

* If you still have problems after this, it is likely a PCB problem which is a whole other world of troubleshooting. Looking for repair logs either here or on other sites could help, learning arcade PCB repair takes a lot of time and effort if you want to try. Not sure if you have any knowledge in these areas, but if the basic attempts above don't work it is probably PCB repair time. Starting a PCB repair thread may get some responses from knowledgeable members here.

 

 

yeah..thought it might be the psu...cabinet hasnt been fired up for 6 years...so could even be dried out caps.

I know the instruction set for the zilog off by heart but they have swapped some of the data lines to protect their code...so a bit messy.

 

I reprogrammed/hacked the eproms about 20 years ago on it (yes thats how long i have had it) i have 40 lives on startup...LOL...so want to fix it...hard without schematics though.

 

So was hoping there was some sort of lazy common fault list as this is a very very old but good game..

 

thanks

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