(Topic ID: 73782)

TZ: Twilight Zone Swich Help...

By Guitoone

6 years ago

Topic Stats

  • 4 posts
  • 2 Pinsiders participating
  • Latest reply 6 years ago by Fanatic
  • No one calls this topic a favorite


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#1 6 years ago

Hello everyboby!
I clean my TZ this morning and change rubber on the mini playfield, so i put it off.
After that when i plug it again, i had test error on switch12, 32, 34, 36, 42.
So I try the switch edge, and i really don't have any switch on the bottom of the playfield and the mini playfield...
After some recherch on the forum, i saw it could be the opto switch under the playfield, so i check it, plug it off and on.
And now, when i do the switch edge, some switch still not responding and for some all the line comes...
it seems to be really bad...
Any help please...???

#2 6 years ago

I would begin with a physical examination.

Your switches are all loosely related in the switch matrix -

32, 34, 36, - are all on the same Column - trace and examine wire J206-3 (Green with a red trace)

12, 42 - are on the same Row - trace and examine wire J205-2 (Orange with a red trace)

Make sure all solder connections are good (no cold joints/ broken wires). Make sure all disconnects are secure and properly seated/ making connection.

3 weeks later
#3 6 years ago

Thanks Fanatic for your advices.
Sorry to be late.
I try everything you said. I check every switch one by one, following the manual. I had Column 1 to 4 with problems...
I check and trace J206-3 and J205-2,and i didn't saw any disconnection. Solder seems to be all good...
I was going crazy ; )

I finally solve the problem changing U20 (IC, ULN, 2803A) (Witch was finally after my command 2803L)

(NB: first time i changing, it didn't work... I put the IC in the wrong way! Check the little hole on the IC and put it on the same side of the other one on the same Board)

So happy that it works again ; )

#4 6 years ago

Thanks for posting your fix (and your mistakes).
Very helpful for folks having problems in the future.
Glad things worked out. You have a very fun game there

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