The TC1000 can use any reflector you like.
Wild has from the very beginning used a standard round prism as a reference and this instrument must be set to a prism constant of zero for this standard round prism. (type GPH1 or GPR1)
This prism has an actual (true) prism constant of -34.4, which...
I fear this error indicates a defect that needs you to send the TC605 in for service.
I don't know all codes by heart, but I think this is either a problem with the EDM electronics or the calmotor. That's the little motor that regulates the amount of return signal to the sensor.
Good luck
André
