I need a TDK DA-3826 Owner Manual.I am trying to record but my recorder says No AUDIO. I know I am using blank disc so what am I doing wrong?

I imagine your search engine works. "TDK DA-3826 manual" leads eventually to...
http://www.manualsonline.com/support/tdk/other/please-help-find-the-manual-for-this-tdk-digital-audio-cd-re-1858792

The CD would have to be rewriteable.

The manual...

http://audio.manualsonline.com/ex/thread/view/idThread/1858792

I can't help you with the manual but the rear panel is fairly simple and versatile...

http://gear.ign.com/dor/objects/481812/tdk-da-3826/images/tdk_da3826_io_scheme_big.html

Like any other recording device it has IN's and OUTs, but in this case there are two distinct units in the case - a Player and a Recorder.

You have analog in's and outs that accept standard Line Level RCA patch cords.

Coaxial Digital connectors carry standard digital audio in or out; ditto the Optical connectors.

I imagine that, being a dual deck, it has internal digital routing for copying from the Player to the Recorder.

I also imagine it requires CD-R AUDIO blank media for making recordings; not computer CDR's.

As described in the manual, like any other digital source.

Find a link to it here...

Click on "Get This Manual"

http://audio.manualsonline.com/ex/thread/view/idThread/1858792

As described in the manual, page 23, the disc must be a Music or Audio blank disc. Data disc won't record on this machine.

Find a link to it here...

Click on "Get This Manual"

http://audio.manualsonline.com/ex/thread/view/idThread/1858792

http://audio.manualsonline.com/ex/thread/view/idThread/1858792

Data cds will not work with this recorder.
You must use music or digital audio cd's when recording!

Select the analogue source input.

Try a different disc brand.You could have a failing record laser.

This message usually indicates that a non-audio disc is in the record tray. Please use only blank music CD-R or CD-RW media. Refer to page 12 of the owners manual for more information regarding acceptable media type for the DA-3826. Also, the laser lens in your CD might be dirty or failing. Try the following solutions: Clean the laser lens with a CD player lense cleaning disc. Lense cleaning discs are available at many electronics retail store. Sorry i can't help you more.