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Twilight Zone sound issue

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redleader View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote redleader Quote  Post ReplyReply Direct Link To This Post Topic: Twilight Zone sound issue
    Posted: 12 Oct 2021 at 7:46am
Hi 
My TZ sound board has gone faulty, when i turn machine on i get
a repeating bong sound about 19 bongs in total if that means anything,
I removed roms cleaned legs and replaced, checked ribbon cable with
multimeter all good, done some reflow work on back of board, checked
for correct voltage, but problen still remains.
Not got another machine to do board swap, any suggestions what to try.
thanks for any help.
Garry...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DaSpadger Quote  Post ReplyReply Direct Link To This Post Posted: 12 Oct 2021 at 8:39am
Try Jim Askey at mypinballs, he’s esp good with audio cards. I’ve only got a DCS card so no good, put got a pinsound +

Restoring a few classics.

Looking for a Carnival, Asteroids Deluxe, Horiz Jamma cab.

Coming for sale: Tempest Upright, Asteroids Upright.
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redleader View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote redleader Quote  Post ReplyReply Direct Link To This Post Posted: 12 Oct 2021 at 11:47am
Ok just re-checked voltages looks like my transformer is faulty.
here are my findings..
J501-1   14V   from transformer secondary
J501-2   14V  loop off J501-1
J501-3   KEY
J501-4   22v   from transformer secondary
J501-5   22V   loop from J501-4
J501-6   5V    loop from fransformer secondary
J501-7   5V    loop from  J501-6

The information i can find online and manual is that all these voltages
should be 20v, i also lifted playfield to check at first plug from transformer,
same results..
anyone know where i can find a transformer for TZ, may be the same on other pins.
Number on transformer is - 5610-12835-00
thanks...
G
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redleader View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote redleader Quote  Post ReplyReply Direct Link To This Post Posted: 12 Oct 2021 at 12:12pm
Originally posted by redleader redleader wrote:

Ok just re-checked voltages looks like my transformer is faulty.
here are my findings..
J501-1   14V   from transformer secondary
J501-2   14V  loop off J501-1
J501-3   KEY
J501-4   22v   from transformer secondary
J501-5   22V   loop from J501-4
J501-6   5V    loop from fransformer secondary
J501-7   5V    loop from  J501-6

The information i can find online and manual is that all these voltages
should be 20v, i also lifted playfield to check at first plug from transformer,
same results..
anyone know where i can find a transformer for TZ, may be the same on other pins.
Number on transformer is - 5610-12835-00
thanks...
Ok more results.. the above test was with J501  unpluged but when i plug
J501 back into sound board i get these results...
J501-1   19.89V   from transformer secondary
J501-2   19.89V  loop off J501-1
J501-3   KEY
J501-4   19.47v   from transformer secondary
J501-5   19.47V   loop from J501-4
J501-6   00.00V    loop from fransformer secondary
J501-7   00.00V    loop from  J501-6
this is driving me nuts, but still fault must be transformer as no voltagge on 6 & 7
anyone shine some light on this
cheers..
Garry.
G
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