Twilight Zone sound issue

[redleader]

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...

 

[Spadge]

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 +

 

[redleader]

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...

 

[redleader]

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.