I've got an old light box, the sort that can be used for viewing old transparancies, or slides. It's about A2 in size, robustly constructed, and at least 25 years old.
I does not work because the blue neutral cable has come loose inside the box and I can't work out where it should attached.
Inside the box are 4 fluorescent tubes cables to two HPF Dimming Ballasts marked SSQH/40220/D, and an on/off/dimmer switch. The blue live cable is connected (via a fuse) to L1 on the switch, cables from L2 and VL on the switch run to either side of one of the ballasts. The green/yellow earth cable is attached to the chassis of the unit.
I've checked the cabling for loose/broken connections if case I can identify where the cable should be located, but no luck.
Any help would be much appreciated.