These are default values from the service manual:
BASS settings: BS1_ 02h BS2_ A4h BS3_ C4h ADJSET settings: COK_ A0h FAT_ C0h TAT_ 3Fh CAT_ 20h FAB_ 00h DEQSET settings: HQ1_ 90h HQ2_ 90h HSG_ 11h HSO_ FDh LQ1_ 90h LQ2_ 90h LSG_ 11h LSO_ 00h GQ1_ 98h GQ2_ 84h GSG_ 11h GSO_ 00h GQR_ 00h CTRL__ settings: CT0_ 48h CT1_ E0h PWL_ 00h RC0_ C0h RC1_ FEh SYC_ A6h DR1_ A0h DR2_ A6h IN1_ D4h IN2_ 67h CTR_ 6Dh CT2_ 14h CT3_ 03h CT4_ 64h CT5_ 74h CT6_ 08h CT7_ 00h SPM_ 00h MSL_ 80h RSL_ 00hThe values for Focus, Spin, Track, Sled and Temp are referring to settings of the optical block and should be left alone...
Note that not all values that differ from this list mean there's an error. My unit had two different values in the control menu and did work, though changing them to the default settings did no harm.