my melcom st6000 system has stopped working?

i have a melcom ST6000 alarm system in my home, it stopped workin a few days ago, i had a look & the tamper light is on, & the key pad doesnt do anything, ive checked the sensors & door magnets they are ok, so i took the front cover off, checked the fuses there fine, then i found a dry joint in the circuit board ive repaired that, put it back together again powered it up & it still dont work, ive lost the paper work i had for it, ie diagrams,instructions, as my only door is down an entry i have to have an alarm that works, can anyone help me with myne please.