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Can an Eprom become corrupt?

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Anonymous
July 11, 2005 7:49:02 PM

Archived from groups: rec.games.pinball (More info?)

I have a JP that T-Rex is not moving side to side enough. There is movement
but like an inch. I assume that the MPU board, Eprom in particular is the
one that controls the side to side motion to find the sides and then center
position.

Since the T-Rex is moving only slightly and I hear the relay click to change
direction which I think is controlled my the Program Eprom thru a transistor
to the relay board, how can it now not be working when it was for years?

Can the Eprom become corrupt?

Brian

More about : eprom corrupt

Anonymous
July 11, 2005 7:49:03 PM

Archived from groups: rec.games.pinball (More info?)

>Can the Eprom become corrupt?

Yes, but very easy to check.

You run a checksum with an eprom burner or have someone do it for you.
The 1's and 0's are added up and given in a hex format (example- 33e4).
You can then run a checksum on a known good code (or it's given with
the code) and compared.

The same rev program should have the same checksum. Anything out of
whack and you need a new rom. I wouldn't even risk trying to re-use the
old one.

Some games do checksums on the eproms (game, sound, display) as a test,
but this is not always the case. I've had some strange game problems
that were solved with a new eprom. My Pinball magic would re-boot if
tried to go into test mode. A new rom fixed that.

Kirb
Anonymous
July 11, 2005 7:49:03 PM

Archived from groups: rec.games.pinball (More info?)

The game's program doesn't tell it how far to move, it only initiates
the movement and waits for feedback from a switch to tell it to move in
the opposite direction. Hence, you have a bad micro-switch or switch
arm.
Related resources
Anonymous
July 11, 2005 7:49:03 PM

Archived from groups: rec.games.pinball (More info?)

Hi Brian
I've had many a difficulty with my T rex, and the problem you describe
sounds like a bad switch. The "center position" switch under the T
rex may not be activating. It's one of those PITA roller switches,
similar to what's used in the ball trough. It's a different part,
though. Try the Trex test in the diagnostics menu.
Brian
Anonymous
July 11, 2005 9:46:01 PM

Archived from groups: rec.games.pinball (More info?)

gixxerdude1000@yahoo.com wrote:
> The game's program doesn't tell it how far to move, it only initiates
> the movement and waits for feedback from a switch to tell it to move in
> the opposite direction. Hence, you have a bad micro-switch or switch
> arm.

Switches check out in the diagostics but will check out.

Brian
Anonymous
July 12, 2005 12:13:15 AM

Archived from groups: rec.games.pinball (More info?)

There is no problem in the diagnostics test of the switches.

Brian


"BrianAce" <blaceb@yahoo.com> wrote in message
news:1121115723.046623.19630@g14g2000cwa.googlegroups.com...
> Hi Brian
> I've had many a difficulty with my T rex, and the problem you describe
> sounds like a bad switch. The "center position" switch under the T
> rex may not be activating. It's one of those PITA roller switches,
> similar to what's used in the ball trough. It's a different part,
> though. Try the Trex test in the diagnostics menu.
> Brian
>
July 12, 2005 1:52:08 AM

Archived from groups: rec.games.pinball (More info?)

kirb wrote:
>>Can the Eprom become corrupt?
>
>
> Yes, but very easy to check.
>
> You run a checksum with an eprom burner or have someone do it for you.
> The 1's and 0's are added up and given in a hex format (example- 33e4).
> You can then run a checksum on a known good code (or it's given with
> the code) and compared.

Even easier, DE games will give you the checksums on the DMD when you
first switch them on. If it really isn't a microswitch failure then
this may give you an easier way to test without the need for an eprom
burner.
Anonymous
July 12, 2005 2:23:07 AM

Archived from groups: rec.games.pinball (More info?)

If the switches test good, then it must be the points of the t-rex that
come into contact with the switch levers (maybe a broken nub of
plastic?). I have a pinbot that had a bent arm on one of micro
switches for the visor. It caused it to cycle (open & close) 1-extra
time for each required movement. Mechanics can be a tough thing to
figure out (for me, anyways, having an electronics background). Take a
good look and try to make some sense of what should be going on under
there and you'll figure it out.
Anonymous
July 12, 2005 10:23:57 AM

Archived from groups: rec.games.pinball (More info?)

is this movement only in test?
it will only move only some in test

I think your problem is like most. Cracked solder joints on the relay under
the PF. there are 2 of them. check them both. better yet just reflow them
both.
often times the t rex will only go to one side not the other. this is he fix
Timathie cargpb15
"Amyotte" <amyotte@personainternet.com> wrote in message
news:11d5j9cb2ro0c68@corp.supernews.com...
>I have a JP that T-Rex is not moving side to side enough. There is
>movement but like an inch. I assume that the MPU board, Eprom in
>particular is the one that controls the side to side motion to find the
>sides and then center position.
>
> Since the T-Rex is moving only slightly and I hear the relay click to
> change direction which I think is controlled my the Program Eprom thru a
> transistor to the relay board, how can it now not be working when it was
> for years?
>
> Can the Eprom become corrupt?
>
> Brian
>
>
>
Anonymous
July 12, 2005 10:40:18 AM

Archived from groups: rec.games.pinball (More info?)

<gixxerdude1000@yahoo.com> wrote in message
news:1121145787.280304.76620@z14g2000cwz.googlegroups.com...
> If the switches test good, then it must be the points of the t-rex that
> come into contact with the switch levers (maybe a broken nub of
> plastic?). I have a pinbot that had a bent arm on one of micro
> switches for the visor. It caused it to cycle (open & close) 1-extra
> time for each required movement. Mechanics can be a tough thing to
> figure out (for me, anyways, having an electronics background). Take a
> good look and try to make some sense of what should be going on under
> there and you'll figure it out.
>

During the diagnostics T-Rex is the one that triggers the switches, they are
not triggered by hand.
T-Rex is rotated right and left using the flipper buttons.

I'll keep looking. :) 

Brian
Anonymous
July 12, 2005 10:46:11 AM

Archived from groups: rec.games.pinball (More info?)

"wolfus" <timeisenga2@sbcglobal.net> wrote in message
news:1mJAe.436$dX5.211@newssvr19.news.prodigy.com...
> is this movement only in test?
> it will only move only some in test
>
> I think your problem is like most. Cracked solder joints on the relay
> under the PF. there are 2 of them. check them both. better yet just reflow
> them both.
> often times the t rex will only go to one side not the other. this is he
> fix
> Timathie cargpb15

During the game boot up when T-Rex is supposed to do his side to side dance
and find center there is little movement. I can go into the diagnostics
menu and move him side to side and the left using the flippers. The left,
center and right switches show that they work.

There is only one relay for the side to side movement, the other is for up
and down, I think, and I tried the reflow yesterday.

Thanks
Brian
!