Burgertime: Speed Hack?

Just to update this I put the game in test mode and it seems that the game is going through the tests super fast. In normal game mode if you press a button will it go to the next screen? It sounds like a stuck button. I disconnect the CP harness and it does the same thing.
 
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So now that I got home I looked at the manual and its the credit switch inside the coin door that advances through the self tests. It appears that it is stuck on. I'm looking at the schematic in the manual and I can't find the test switch. I guess its time to start tracing the wire back to the pcb and follow the traces.
 
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Just to update this the credit switch is tied into the coin door coin switches. Any of the coin switches or the credit switch will advance the tests.

I haven't found the issue with the speed up or stuck switch issue yet. I did notice when I went into the DIP switch test mode that dip switch 2 does not change states and position 6 is rapidly changing between 1 and 0. This is going to be a challenge!
 
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So now that I got home I looked at the manual and its the credit switch inside the coin door that advances through the self tests. It appears that it is stuck on. I'm looking at the schematic in the manual and I can't find the test switch. I guess its time to start tracing the wire back to the pcb and follow the traces.

The schematics I have are very hard to read (anyone have a better scan?)

If you have a stuck switch check the LS04 at 9C and it looks like 4D . Check pins 11 and 10 on 9C and Pins 3 and 4 on 4D (I would expect them both to be 9C, so might be a missprint on the schematics).

Then I would check the LS367 at 8H Pins 12 and 14.

If those don't pan out, check 13J and 13H, the the LS74's next to those.
 
The schematics I have are very hard to read (anyone have a better scan?)

If you have a stuck switch check the LS04 at 9C and it looks like 4D . Check pins 11 and 10 on 9C and Pins 3 and 4 on 4D (I would expect them both to be 9C, so might be a missprint on the schematics).

Then I would check the LS367 at 8H Pins 12 and 14.

If those don't pan out, check 13J and 13H, the the LS74's next to those.

Excellent thanks!

At the time I thought the stuck switch was the credit switch. After reading the schematics the credit switch is tied into the coin switches on the door but because it is past the coin door it doesn't trigger the coin counter.

I don't think that is my problem. I have another LS74 to check out because of a DIP switch issue and then i need to figure out why in the world my PCB is running so fast.
 
Excellent thanks!

At the time I thought the stuck switch was the credit switch. After reading the schematics the credit switch is tied into the coin switches on the door but because it is past the coin door it doesn't trigger the coin counter.

I don't think that is my problem. I have another LS74 to check out because of a DIP switch issue and then i need to figure out why in the world my PCB is running so fast.

Well the dipswitch itself could be bad.

Dip Switch 1 is read by the LS367 at 15C and 13C
Dip Switch 2 is read by the LS367 at 14C and 13C

I would also check the resistor packs RM1 and RM2.

For your speed issue, you might check the NE555 at 2A or the LS04 at 1C.
 
Well the dipswitch itself could be bad.

Dip Switch 1 is read by the LS367 at 15C and 13C
Dip Switch 2 is read by the LS367 at 14C and 13C

I would also check the resistor packs RM1 and RM2.

For your speed issue, you might check the NE555 at 2A or the LS04 at 1C.

Thanks for the assistance I think you have pointed me in the right direction. The LS04 @ 1C had a 103k 100v mylar capacitor soldered to pins 1 and 7. I'm not sure why that was there but I'm guessing its because of a problem with the LS04. I removed it just to see what happens and there is no change. I don't have any spare LS04s so I'm going to have to order a few.

I socketed the 555 and put a new one in and that didn't fix it either. Luckily my new desoldering gun allowed me to reinstall the original since I was able to remove it without damaging it :)
 
Do your sounds play at normal speed?

Do you see any tearing in the video?

The sounds play at the normal speed and there is no tearing. Its just like it is on fast forward. At the end of the first level it plays the end level music but it doesn't complete it.
 
The sounds play at the normal speed and there is no tearing. Its just like it is on fast forward. At the end of the first level it plays the end level music but it doesn't complete it.

If you have an Oscilloscope, you could check to see what the clock is going into the main CPU. See if it's too fast or not.
 
Ok, this has been fixed.

The problem was on the Sound Board.

The issue was a lifted pad on Pin 1 of 15C. This broke the connection between PIN 1 of 15C and Pin 15 of 13C and Pin 12 of 14F.

I ran a jumper from the top side of Pin 1 of the Socket for 15C to Pin 15 of 13C and Pin 12 of 14F and all is good now.
 
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