E124
Error: Variable condensator for E124 VCO SN74S124 needs re-adjustment.
Detection: XXDP diskless controller selftest failed.
Repair: let "XXDP diskless controller selftest" running, rotate trimmer and find left and right position wich let test succeed. Then choose middle position between those two extrems.
2x occured!
Contact: Jörg Hoppe
E21
Error: Fast bipolar PROm 82S171 was "all-zero" ... as if now power applied.
Detection: XXDP diskless controller selftest failed.
Repair: New part can be programmed with ALL07
Contact: Jörg Hoppe