what will cause a DS1210 chip to fail

maddog14

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as in immediatly after relacing on gottlieb system 3 board

Is this feasable: not using a 0 ohm resistor in the jumper?
 
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as in immediatly after relacing on gottlieb system 3 board

Is this feasable: not using a 0 ohm resistor in the jumper?

Can you give a little more information? What is the game doing? Sorry, I don't have my System 3 schematics in front of me and my memory is a little foggy, but what jumper are you asking about?

One thought I had was that the DS1210 could have been damaged when it was installed. It is a CMOS device and is highly succeptible to ESD damage. You did install an IC socket when you pulled the old chip, right?

--Luke
 
Thanks Luke for replying.

The short history; bought this machine doa. Board does not boot, in or out of machine.

I have the board out. using 5 volt PC power supply to bench test. The board is a newer style board with the space for a 28 pin 6264 memory. It will not boot. . When I got the board, the jumper 4 had been moved to jumper 3 to accommodate the 6116 memory, but the zero ohm resistor had been replaced with a piece of wire.

The 24 pin memory had been placed at the bottom of the 28 pin socket. The closest I get to booting is when I have the original 24 pin 6116 memory installed at the top of the 28 pin socket (with memory installed in proper direction) the red light blinks for a few seconds and the goes solid red. (All I get is solid red light with the new 6264 memory I have with jumper 4 in place)

I noticed the u6 DS1210 was dropping 1 volt on the output to the memory ( which drops down below 2 volts) . the DS1210 data sheet says that I should only see at most a .3 volt drop.

When I socketed and replaced the expensive ds1210 chip, it worked properly for just a short while. Then when I rechecked the chip, it was down to 1 volt drop, like the previous bad chip.

That being said, the manual says they use a ZERO ohm resistor. Jumper 1 has a ZERO ohm resistor for the 27512 EPROM. The memory jumper does not have a resistor jumper. Just a wire.

Can that be my booting problem, or just another thing that needs to be fixed first? Or something that should have no effect at all.
 
A zero ohm resistor is basically a short piece of wire (i.e. a short piece of wire has pretty much zero ohms of resistance). So, that's not the problem.

What voltage is the power supply running at. IIRC, it needs to be pretty close to 5v otherwise it can cause weird problems.

--Luke
 
I would test the DS1210 with the RAM not installed. If you find the new DS1210 to be bad too my guess would that that you fried one of those RAMS (probably the 6116 because you already said you installed it in the wrong position) and the RAM then fried the DS1210.

That's just a guess. I could be totally wrong.

Like I said, I would test the DS1210 with the RAM removed and get that working. Then install jumper J4 and install a known good 6264 RAM and see what happens. You might have problems extending beyond just the RAM.

If you have an EPROM programmer, many of them have a RAM test option. That might be an option to test the 6116 and 6264 RAMs.
 
pulled out the 6116 and tested, the ds1210 at u6 is now working properly.. even with the 6264 in place... but no boot.
no check this out, with board in game , hooked up, sound boards dont boot. with the p4 connector removed the sound boards boot... but control board still does not boot.

how many different chips affect booting?
 
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