Hello, I'm not an absolute expert, but I successfully fixed a couple of RL02 in the past. Adjustment to the head is only useful for azimuth, I think. The radial position will be adjusted continuously using the servo tracks, so there's no absolute position adjustment at all. If the drive fails during spinup, I would check at least the following: - the presence of spindle sector signal after digital conversion of pulses from analog signal coming from the pickup. - having disabled the servo linear motor (there's some jumper to setup, check the maintenance manual), perform the motor spinup, then load slowly the heads on the disk by hand, until you find the servo tracks. - with an oscilloscope check the presence of analog signal of the servo tracks on both heads, and it's digital counterpart after amplification and threshold detection (expected level values in the manual). If you see something strange, e.g missing or too short pulses, try to adjust the gain with the trimmer on the head board - enable again the servo, then load again
My 2 cents. Andrea