Monitor Issue / Asteroids Ship Glitch

Use flush cutters to snip the legs, and then tweezers or bulb to pull out the remains. The objective is to not hurt the PCB first, and secondarily to remove the chip. Then inspect around the holes and remove any stray solder. Then solder in a dual wipe socket. Then you can insert a new 2114 RAM chip from twistywrist or arcadechips or Bob Roberts.

is desoldering just to risky to hurt the board?
thanks
blake
 
Trying to save the chip is false economy unless it's expensive or hard to find which a 2114 is not. Puts the board at risk and the heat is bad for the chip.
 
does the 2114 have .3 spacing in the legs?


Yes. If you are ordering from Bob you can just buy the 2114 and say 'plus socket' and he'll send the right one. If I were you I'd order a few because the Asteroids manual claims that self-test stops at the first failing chip (so after you fix it you may find you get an error beep on a subsequent one). I think there are a total of six for Asteroids.
 
Yes. If you are ordering from Bob you can just buy the 2114 and say 'plus socket' and he'll send the right one. If I were you I'd order a few because the Asteroids manual claims that self-test stops at the first failing chip (so after you fix it you may find you get an error beep on a subsequent one). I think there are a total of six for Asteroids.
ok thanks a bunch.
blake
 
so i pulled the pcb out to do the repairs and i noticed it has been worked on and has an odd sub assembly pcb that has jumpers going to multiple ic's and a resistor? not sure if it was used because of bad traces or if it has something to do with a high score save kit or multi-kit?
thanks
blake
 
pics of pcb
 

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so i successfully replaced R4, but get the same results. put it in test mode and now am getting a r6 error so on to changing the P4. so far so good.
thanks
blake
 
so after successfully replacing P4 i am no longer getting a ram tone error. but i still have the same glitch and in test mode i am getting the following picture. pic below.
thanks
blake
 

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You're going to need a logic probe, and to start probing.

I would first check the LS161 counters at B7, C7, and D7. Specifically, check pin 15 on each chip. If any of these aren't toggling, replace that LS161.
 
You're going to need a logic probe, and to start probing.

I would first check the LS161 counters at B7, C7, and D7. Specifically, check pin 15 on each chip. If any of these aren't toggling, replace that LS161.

i have no experience with a logic probe although im not opposed to learning and investing in one. can we still rule out the daughter board and its jumpers?
thanks
blake
 
The daughterboard is a speed mod board. I have one just like it, with the 4 chips and 4 colored wires.

If you want, you can remove the board, desolder the wires (making note of which ones go where, in case you want to reinstall it in the future), then replace C5 with an LS161. That should put the board back to stock condition, however I wouldn't think it's likely to be the cause of your issue, as glitches like that are usually due to problems late in the vector chain, rather than the clock circuit, which is what that daughterboard modifies.

Can't hurt to try removing it though. My guess is it will make no change, but you never know.
 
The daughterboard is a speed mod board. I have one just like it, with the 4 chips and 4 colored wires.

If you want, you can remove the board, desolder the wires (making note of which ones go where, in case you want to reinstall it in the future), then replace C5 with an LS161. That should put the board back to stock condition, however I wouldn't think it's likely to be the cause of your issue, as glitches like that are usually due to problems late in the vector chain, rather than the clock circuit, which is what that daughterboard modifies.

Can't hurt to try removing it though. My guess is it will make no change, but you never know.

is there a big difference in the speed? i suck at the game so probably wouldnt hurt to slow it down a bit. ill probably bring it back to stock. is there value to the mod? was it retailed by a company?
thanks
blake
thanks
blake
 
You're going to need a logic probe, and to start probing.

I would first check the LS161 counters at B7, C7, and D7. Specifically, check pin 15 on each chip. If any of these aren't toggling, replace that LS161.

if i wanted to shotgun the issue would purchasing 3 of these and replacing at each location be a good chance at solving the problem? or are there other ic's i should by as well? or is this a terrible approach and buy the probe and learn how to use it?
thanks
blake
 
Imagine all life as you know it stopping instantaneously and every molecule in your body exploding at the speed of light.
 
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