Burgertime error

BubbaK

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My Burgertime is giving me more troubles. When I power the machine up, it automatically goes into the test screen. The 2 test switches function properly, and when they are in the off position, the game still goes into test mode. As I cycle through test, the dip switch screen shows switches 7&8 on SW1 turned on. They are not. I've tried to clean the switches, worked them back and forth and it is still there. Do dip switches go bad, or is something else going on?
 
My Burgertime is giving me more troubles. When I power the machine up, it automatically goes into the test screen. The 2 test switches function properly, and when they are in the off position, the game still goes into test mode. As I cycle through test, the dip switch screen shows switches 7&8 on SW1 turned on. They are not. I've tried to clean the switches, worked them back and forth and it is still there. Do dip switches go bad, or is something else going on?

Dip switches can go bad, but rarely.

Check the Resistor pack at RM2, then check pin 12 on the 74LS367 at 13C.
 
Thanks guys.. I'll give these a check tonight and see whats up.

Am I checking Pin 12 for voltage or continuity? I don't have a logic probe, but do have a good DMM.
 
Thanks guys.. I'll give these a check tonight and see whats up.

Am I checking Pin 12 for voltage or continuity? I don't have a logic probe, but do have a good DMM.

At this price how can you go wrong? Very worthwhile tool to have on hand.

http://www.ebay.com/itm/LOGIC-PROBE...769?pt=LH_DefaultDomain_0&hash=item53ec0f3b51

It cost just a bit more than making one like I did and this one above is more forgiving on the power inputs. It has audio also so when you are craning around a cab, you don't have to look at it to tell if it is high or low. Home brew doesn't

http://www.swansontec.com/sprobe.html
 
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Done.. thanks for the link. I haven't needed one yet, so I never bought one..

At this price how can you go wrong? Very worthwhile tool to have on hand.

http://www.ebay.com/itm/LOGIC-PROBE...769?pt=LH_DefaultDomain_0&hash=item53ec0f3b51

It cost just a bit more than making one like I did and this one above is more forgiving on the power inputs. It has audio also so when you are craning around a cab, you don't have to look at it to tell if it is high or low. Home brew doesn't

http://www.swansontec.com/sprobe.html
 
Ok.. I think the chip at 15c is done. According to the links posted above, when the dips are off, there should be no signal out on 15c. I have a signal. With my dmm, its showing 3.75vdc. At the board connector, I'm getting 5.12vdc. I'm going to get some replacement chips, but could I cut the legs on the 2 outputs that show the dips are on to test?

I did pick up the logic tester listed above. This board doesn't have any test points to hook up to, so I used my meter instead.
 
I tried to clip the 2 legs, and made it worse... No pic, and nothing past the start chime. Guess I'll have to wait a few more days till the chips get here.
 
Ok.. I think the chip at 15c is done. According to the links posted above, when the dips are off, there should be no signal out on 15c. I have a signal. With my dmm, its showing 3.75vdc. At the board connector, I'm getting 5.12vdc. I'm going to get some replacement chips, but could I cut the legs on the 2 outputs that show the dips are on to test?

I did pick up the logic tester listed above. This board doesn't have any test points to hook up to, so I used my meter instead.

the main thing is to look for where a problem should be, ie rom, they should have most of the lines pulsing real fast on on one state or the other; Hi/lo. At this point just hook that thing up and start probing some chips and just get used to how the different signals read. Look for floating pins; Pins where everything goes dark.

You will learn real quick on what the signals should and will look like on similar chips. You will also see very quickly if a board is working some or not at all.

One pin is almost always good to look at is the reset line of the cpu chip(s).
 
Thanks.. I was all set to start probing around, but there aren't voltage test points on the board. In this case, do you guys just solder something to find a spot to get the 5v from?



the main thing is to look for where a problem should be, ie rom, they should have most of the lines pulsing real fast on on one state or the other; Hi/lo. At this point just hook that thing up and start probing some chips and just get used to how the different signals read. Look for floating pins; Pins where everything goes dark.

You will learn real quick on what the signals should and will look like on similar chips. You will also see very quickly if a board is working some or not at all.

One pin is almost always good to look at is the reset line of the cpu chip(s).
 
Thanks.. I was all set to start probing around, but there aren't voltage test points on the board. In this case, do you guys just solder something to find a spot to get the 5v from?

Usually a cap of some kind has the voltage you need for the logic probe. Use you Volt Meter to find a +5vdc source. If you look at the 74lsxx chips the pins that go to pins 8 and 16 usually have the voltage source you are looking for. Just follow them traces to find a good spot to power the logic probe. Then you just practice probing some chips, first probe some of the other 74lsxx chips on the power pins and watch the results. Then maybe do some roms but don't touch more that one pin at a time. I would look at the schematics but on dial up it would take too long.
 
I finally got around to replacing the chip at 15c.. that went well. I think I have bigger problems now though.. Somewhere along my way of testing and removing and installing the boards, I apparently had the video board connector on backwards, putting +5v on the ground leg. The machine seems to run through its test mode just fine, but when I power it up with the service switches off, I get the initial chime and thats it. Black screen, no sounds, no inputs or coin ups. I know the game was powered up at least 2x with the plug backwards. Any chance on resurrecting this or is it toasted?
 
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