Gear shifter - not enough clicks

I am trying to fix the gears on a mates Trek 8000. The shifters, which are Deore LX, do not have enough clicks in them. Eg before the cable is attached, for the rear there are only 4 or 5 clicks , consequently only the 4 or 5 smaller cogs are accessible.
Do you think the shifter is broken, or is their some adjustment I am unaware of? I have given them a good spray of WD40, and am fitting new cables.
Do you think the shifter is broken, or is their some adjustment I am unaware of? I have given them a good spray of WD40, and am fitting new cables.
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Open them up and have a look.
VOODOO CANZO
Come and see me at https://www.facebook.com/biketyke/
I've bought a new bike....ouch - result
Can I buy a new bike?...No - no result
In trepidation I opened the shifters up, they looked OK. Sprayed in some degreaser, then water, followed by GT85 - both back to life now.
Cheers