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grobda View Drop Down
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    Posted: 21 August 2011 at 2:03pm


As mentioned on another thread, thought I'd put it here too for posterity;

PCB had sprites missing, played blind, odd lines here and there looked like remainder of sprite data.

Checked schematics found 2 2114 'object rams' at 1A and 2A, output pins looked weak on scope. Replaced these rams and sprites came back, but missing alternate lines;



found another two pages of schematics for object control, and another 4 2114 rams (3H,4H,3J,4J) as mentioned on this repair log - http://www.jammarcade.net/?p=1260

swapped these and now the game works. decided to do them all, as its hard to determine which is causing the problem, plus if ones bad the rest might follow.


Edited by grobda - 21 August 2011 at 2:03pm
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Cool, missing or partial sprites are usually down to RAM on the lower board on Commando, usually caused by overvoltage if more than one RAM is bad.  Great work and thanks for sharing.

Edited by Equites - 21 August 2011 at 2:49pm
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My board also seems to have the same issue, are these the 2 chips you are taliking about on the top board?

 
 
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Nope, they're 74138's decoder logic

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...and the one above that is a multiplexer. You are looking for a 18 pinned IC, should be marked 2114.
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Haha, I saw two 138's

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All the 2114s mentioned are on the bottom board
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Ok I will have another look, thanks
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I think I got em. Are they an easy chip to find & replace?
 
 
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those are them, as mentioned before theres also a bank of them in the center-ish of the pcb. check the data i/o lines; a probe might tell you, a scope will tell you. i got my last lot of 2114s off ebay.
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can i ask a question specifically about weak signals?

can a probe indicate this kind of symptom? because sometimes when probing, the hi/lo LED displays a dimmer light than normal. is that considered a weak signal? and is that considered a fault on the IC or is there a reason for this?
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Originally posted by vib_ribbon vib_ribbon wrote:

can i ask a question specifically about weak signals?

can a probe indicate this kind of symptom? because sometimes when probing, the hi/lo LED displays a dimmer light than normal. is that considered a weak signal? and is that considered a fault on the IC or is there a reason for this?
 
A probe is no good for testing RAMs in-circuit.  Pretty much all I use them for is to look for floating pins.  A scope will show you if the signal is clean or mashed, a probe will not.
 
The problem with RAMs is that they will go on and try to operate till the end, just not within spec anymore.
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Originally posted by Beaps Beaps wrote:

I think I got em. Are they an easy chip to find & replace? 
 
Andys-Arcade has them in stock;
 
 
 
How is your soldering?
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Originally posted by Equites Equites wrote:

A probe is no good for testing RAMs in-circuit.  Pretty much all I use them for is to look for floating pins.  A scope will show you if the signal is clean or mashed, a probe will not.
 
The problem with RAMs is that they will go on and try to operate till the end, just not within spec anymore.


thanks for that answer.

i looked a little further into dim lights.

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Types of faults:

1.     Open output in driving gate:-

Symptom:- a loss of signal to all gates, Bad floating level, Logic probe light will be “dim”.
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Points: 4124 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Beaps Quote  Post ReplyReply Direct Link To This Post Posted: 29 April 2012 at 12:26pm
Originally posted by Equites Equites wrote:

Originally posted by Beaps Beaps wrote:

I think I got em. Are they an easy chip to find & replace? 
 
Andys-Arcade has them in stock;
 
 
 
How is your soldering?
 
Thanks for this info mate.
 
How is your soldering? LOL 
 
Never done it before....Ouch 
 
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Originally posted by Beaps Beaps wrote:

Originally posted by Equites Equites wrote:

Originally posted by Beaps Beaps wrote:

I think I got em. Are they an easy chip to find & replace? 
 
Andys-Arcade has them in stock;
 
 
 
How is your soldering?
 
Thanks for this info mate.
 
How is your soldering? LOL 
 
Never done it before....Ouch 
 
 
In that case I strongly recommend that you send the PCB to someone who can, or you WILL damage the PCB.
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This problem seems to happen a lot with Commando, I would recommend anyone wishing to purchase it, to consider the bootleg version
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Originally posted by lhantz lhantz wrote:

This problem seems to happen a lot with Commando, I would recommend anyone wishing to purchase it, to consider the bootleg version

bootleg has the same problem
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