So i started up my Twilight Zone after a month of not playing to find the following errors:-
Check switch 12 - Right Outlane
Check switch 32 -Right Jet Bumper
Check switch 33 - Lower Jet Bumper
Check switch 34 - Left Slingshot
Check switch 35 - Right Slingshot
GND Short Row 2
GND Short Row 3
GND Short Row 2
GND Short Row 4
GND Short Row 5
GND Short Row 6
Ball Popper Opto Is Stuck

In the manual it says that all the GND shorts are connected to connector J208 but it would seem from the attached image they seem to be connected to J209.
The machine was fully working last time it was turned off.
Any ideas where i should start trouble shooting?

Thanks in advance all.

Mario

IMG_1876 (resized).JPG

Thank you in advance for any help you can offer.

Checked the switch matrix as explained in the supplied link and all seems to be well.
I'll check the voltage next and if thats ok it's on to the switched themselves i guess

Ive checked Voltages on TP1,2 & 3 and they seem to be correct:-

TP 1 - 13.51 (a bit high)
TP 2 - 5
TP 3 - 11.88

Would this suggest the board is ok or would i still need to check for battery damage?

I also have a Star Trek TNG, could i pull the power driver board from that and install it into TZ to test?

I’ll try that and let you know.

Thanks

The short rows have gone and now I only get the following errors:
Switches 12, 32,33,34,35 and ball popper opto is stuck

Update:
After putting back the 10 opto board the short seems to have cleared.

The clock is acting erratic in that the optics seem to be working and in the test it knows where 12:00 is but when I come out of test mode it never seems to find 12 (this is the new led version installed)
And the following errors are left:
Switch 32,36,42,44,45 and clock is broken

The clock was working correctly before, on opening it it would seem the problem is with the 15 min sensor as it seems to operate sporadically, must be a bad connection.

The row shortages must be due to a bad connection of some kind as sometimes they appear and disappear again, all other errors have stopped.

All individual switch errors are gone too, only the clock remains.
The issue is that sporadically the row errors reappear, i'll just have to make sure all plugs and cables are connected firmly i guess.