How to use Accubias feature on Onkyo tape deck?

I own the TA-2090 which has this feature. From memory, just insert a tape and push the accubias button. The machine does the rest! I believe you'll want to set the recording level to an appropriate level and also turn down the volume on your preamp. The machine lays a tone on the tape, rewinds to the start of the tone, then uses it to set an optimal bias level for the particular tape-type you're using. My TA-2090 needs some work if you know a good technician.
Thanks, Ken

Oops! It just dawned on me (remember, this is from memory)... I think you've got to set-up your deck like you're ready to record... i.e. 1. press pause 2. press play-and-record at the same time 3. press the accubias button. You're welcome...