Cary Audio CAD 280sa V12i Power amp

No, all 12 LED not lit up when power on at the first time and after. Are they supposed light up during normal condition? input selector is set on RCA. power switch is set on position, standby switch is set on operate. I tried to adjust the right channel bias level slowly started from 0 counterclockwise to about half, noticed that all 6 kt88 were lit up for short while and hear low level distortion sound and then all LED is off. I turned off the unit, wait for while before turning back on, nothing happened. LED not lit up no matter how precisely turn the bias level. all 16 tubes lit up though. hope this will get you more understanding its current working condition. thanks for helping.

sorry, I meant turn clockwise.

Have you checked your fast blow fuses?

I am assuming you do not have the manual for it. You can download it by searching their website, Caryaudio.com, it has very detailed biasing instructions.

Check your fuses as Markwatkiss suggested.

I am away from home at the moment. Will check the fuses again when come home. In fact at the very first time connected to power, all tubes lit up but no sound at all, I did find a AC 3A fuse blown on left channel but not sure if it already blown before arriving to my door or after I connected to power. I replaced a new fuse, thus 3 blue LED on face plate lit up, Tubes all lit up but NOT the tube red bias indicator. Wiring are connected properly. Still not hearing nothing. I think adjusting bias level has nothing to do with no sound issue. Incorrectly set the bias level can affect the sound quality. I have the menu, but little confusing to read. At one time I do hear a low level distortion sound while adjusting the bias level, until the red LEDs turned on and went off. from there I have not checked for blown fuses. Gotta go out on business trip until next Wednesday. I sure will post what I might find out. Thank you, guys. Happy holiday!