NEED HELP -Conceptronics oven HVC102 SERIES-trouble shooting

Hi all, Need help troubleshooting for I've just bought a 1997 second-hand oven HVC102. Unfortunately, after loading profile & press run mode we found all TC READING IS ZERO & CONVEYOR READING FEEDBACK IS ZERO SHOWN ON MONITOR SCREEN ,& I LOSS PASSWORK LEVEL 3 I HAD REPLACE DC MOTOR CONTROL CARD BUT PROBLEM STILL PERSISTS -SOFTWAVE REV---- 09-01-94 WINDOW REV 2.50C EPROM REV-386AT WINDOWS I just need a little help trying to figure out the problem. Thanks for any input.

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