Xevious Issue

LBJon

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I recently purchased a Xevious in great condition a couple of weeks ago, and up until yesterday it worked fine. Now when powering on the screen is frozen on the 'rug' pattern (see pic). I read on an older thread to re-seat the Z80's on the PCB, however these seem to be really stuck in their place and I was hesitant to apply too much force to remove these. Any advice on removing?

Also, any other advice in general to get it back working?
 

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Pickup some Deoxit brand contact cleaner and use that to soak into the sockets for a while before carefully wiggling them out, but yes you need to swap out the z80 cpus as the first test. There are 3 of them and they can be moved around to see if.anything changes on booting. Then you can narrow down to which one is bad.
 
before you start in on replacing parts on the board, check the +5 volts dc on the power supply and again ON THE BOARD using your trusty multimeter
is it right on ?
is it high or low ?
report back plz
 
Thanks. Need some help on how to check voltages on this power supply?
 

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pin 6 and 7 on the game board or check it at the connector there on the game board

that picture shows a problem with the fuse holder there and all those wires could be gathered up and a few wire ties to neaten up the area
is that a burned out fuse holder under the fuse holder floating there in space or no

negative/black lead of the multimeter on ground and the red poking in the connector pin 6 and 7 with the multimeter set on DC (not ac with the wavy line)

follow pin 6/7 wire back to the power supply to test it there.

the point of testing the output of the power supply both on the game board and at the PS itself is to detect any voltage drops along the way there.
sometimes a weak pin inside the connector can inhibit electron flow and cause all kinds of wonky problems

if this were my project, I would replace that big blue capacitor IMMEDIATELY
you can get them from bob Roberts. that could be your problem right there. those big blue capacitors filter the +5 volts and as they dry up can leak ac and cause all kinds of trouble including your problem
 
Thanks. Need some help on how to check voltages on this power supply?

For the Love of GOD tell me that is not what the bottom of your cab looks like!
Monitor Adjustment board Loose next to the power Supply, and the bare fuse connections. It looks like some one had swapped in a newer monitor, cables are messy. There are 2 Bare ended wires just "Floating" near the exposed power brick fuses. Orange and Yellow, I assume from the monitor, as it looks like someone wire nutted the video lines together, again way to long, and laying on the power block. Please at least tidy that up so you can say your not going to have a short someplace.
 
I know it's a mess when I got this a few weeks ago. I've tidied it up a bit. You're right about the orange and yellow coming from the monitor. What should I do with those? As you can tell by now I haven't worked on cabs much but I'm trying to soak in all that I can from the experts and research.
 
pin 6 and 7 on the game board or check it at the connector there on the game board

that picture shows a problem with the fuse holder there and all those wires could be gathered up and a few wire ties to neaten up the area
is that a burned out fuse holder under the fuse holder floating there in space or no

negative/black lead of the multimeter on ground and the red poking in the connector pin 6 and 7 with the multimeter set on DC (not ac with the wavy line)

follow pin 6/7 wire back to the power supply to test it there.

the point of testing the output of the power supply both on the game board and at the PS itself is to detect any voltage drops along the way there.
sometimes a weak pin inside the connector can inhibit electron flow and cause all kinds of wonky problems

if this were my project, I would replace that big blue capacitor IMMEDIATELY
you can get them from bob Roberts. that could be your problem right there. those big blue capacitors filter the +5 volts and as they dry up can leak ac and cause all kinds of trouble including your problem

Sorry for the delay, been busy but now focused on this over the holidays. So I replaced Big Blue, and reseated and rotated all the Z80A's. This produced a minor effect in that the rug pattern now has motion. I can even see the Atari logo once in a while in the bottom right corner of the screen.

Any advice?
 
UPDATE: I swapped out the 3 Z80A's for new ones with no success. Still the moving rug pattern when in test mode, and a static rug in normal. Looking for any advice - thanks again.
 
UPDATE: I swapped out the 3 Z80A's for new ones with no success. Still the moving rug pattern when in test mode, and a static rug in normal. Looking for any advice - thanks again.

If your voltage is good, right around 5v measured at the board, coz Xevious is a pig for a solid 5v. Move onto...

You've probably done this already but reseat the interboard connector that joins the CPU to the video board.

Then reseat the three 08xx custom ICs, then the one 06xx custom IC, then the one 51xx custom IC. It's possible but they may need to be re-socketed.

Take care with the 08xx and 06xx IC's they tend to rot and the legs fall off.
 
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