No GI on my Space Invaders

[Classicpinballs]

As the  title says, I've suddenly lost the GI on my Space Invaders. I've checked the  fuses on the -rottendog- rectifier and they are all fine. Apart from the fuses on that board, I cant seen to find any others on the machine so I guess there's a fault somewhere. All the feature lamps are fine and everything else works ok. I'm wondering if the rectifier board is giving too much out? I checked the voltages on the test points and they are all about 10% higher than the voltage values are stated on the test points. But that would give me GI, surely?

Any ideas as to where to start looking please?

Many thanks, Doug.

[Strangeways]

Have you removed the fuses to test them ? I've seen dozens of fuses measure correctly, only to find them open when removed from the board.

IS GI missing from the headbox and playfield ?

[Classicpinballs]

Yes, I've taken them out, one by one and tested them and all are ok [I know what you mean about false readings  ]
I have GI on the head unit, its just the playfield that has died for some reason.. Machine plays fine, apart from this.