spyhunter help!!

berlincam86

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my game will power up and i can go into the diagnostics part and all the inputs will register in the input tests except the gas pedal and steering but the coin in will not work in game play. Anyone know whats wrong with my game?
 
The gas and the steering go through a tiny "absolute position" pbc. I'd start by looking at it.

Edward
 
I tryed another board that i have and it still doesnt work. Who knows if that board works tho.
 
also can anyone tell me step by step on how the main boards seperator plates go back together?
 
The coin meter is powered by +5v from connector 5 pin 1, white wire on power supply, connects to coin meter, then continues on white/yellow wire to J5 pin21 on the soundboard, the return to complete the circuit is through J5pin20 white/brown wire back to connector 5 pin 10. Make sure the path is completed when coining the game.
Board seperator plates
All notches facing up, furthest away from cabinet side sound board w/ components facing left, attached to plate, cpu board middle attached between plate 1 and 2 component side facing right, video board attached between plate 2 and 3 components facing left. Gas and steering powered by +5v from connector 5 pin 4 red/yellow wire to connector J2 pin16 on absolute pos board. Return ground from J2 pin 4 yellow/gray wire to connector 5 pin 3 ground. Test voltage and make sure pin 3 is connected to ground. Pots are possibley bad. Check pot resistance with meter.
 
have you replaced the board interconnect ribbon cables? If they're the white with blue striped kind, there's a good chance they're causing at least some of your problems. That is really the first thing that i'd replace.
As far as how the stack goes together -the order is SSIO on top, cpu in the middle, and the video on the bottom. the video and cpu board parts side face each other. The bottom plate has the long studs on one side only. The center aluminum plate is the one with the longer studs on each side. The top plate is the one with short studs on both sides. The notches on all 3 boards line up with the notches on the top of all 3 plates.
If thats not enough, look at www.crazykong.com in the pcb pics, i'm sure there's pics of a SH boardset there.
 
and you've checked continuity between boards? If they're the dual rows, they're kind of weird the way they plug in. If you use the top row of one, you use the bottom of the other.
When you boot the game do you get an ssio error?
 
ok, so turn the game on, and let it boot. Now unplug the connector from J4 on the ssio board. Take a wire and touch it from pin 1 to pin 9 of j4 on the ssio board. It should register a credit. Then take the same wire and touch it from pin 2 to pin 9 of j4 on the ssio. It should register another credit.
If it does, you have a cabinet wiring problem, if it doesn't, you have a board problem.
 
Oops, I mistook the coin meter(counts the total # of credits like an odometer) with the game credits when I looked at the schematics and posted. On cdjump's post, I might add pin 1 is for coin slot 1 and pin 2 is for coin slot 2. Specifically what is wrong with your game?
 
What I dont understand is why does it register the coin in during diagnostics but not during gameplay? Everyone is thinking its a wiring problem. So if its wiring why does it register during diagnostics? if i can find out what chips control inputs to the game computer itself i can probably find the problem.
 
if it registers in test mode, then its not the fault of the input chips, if it was dead, it would be dead all the time. My guess at this point would be a rom problem, most likely some bit rot.
Fwiw, the schematics are available at www.klov.com go to the spyhunter page and scroll to the bottom.....
I can tell you that the coin input is handled by F2 on the ssio board, but thats not your problem.
If you try what i posted above, that will elliminate the cabinet wiring completely. Who knows, the coin wire ground might be miswired through the service switch, or more likely, its got bit rot.
 
most likely bit rot in the roms then. But, just on the off chance, have you checked the voltage on the pcb itself? Not likely, but low +5 could possibly cause it.
Set a voltmeter to DC Volts, with the next higher scale greater than 5. Put the black lead on the bottom left corner pin of an eprom on the ssio (top board). Put the red lead on the top right hand corner pin. Eproms are the wide chips with stickers on them covering a clear window - there should be 2 on the ssio. The top of the chip is the end with the notch. You should read no lower than 5.0V. If its lower, that might be the issue.
 
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