CR-840 adjustments?

I recently acquired a Yamaha CR-840 and have been searching for a service manual for it without any luck.

The DC-Offset is high and needs to be adjusted and I would like to check/set the bias while I'm at it.

I only see two pots in the amp section one marked DC-L and the other marked DC-R which I'm guessing are for DC-Offset adjustments.

Can someone confirm this for me and also let me know where to set/check the bias and the correct value for it.

Thanks in advance

E-mail Norman
and tell him what you need ie. CR-840 SM.
he will provide a extremely good quality pdf. for minimal cost.

http://www.analogalley.com/m_yamaha.htm

You are correct that the two pots you see are for offset.

There is no bias adjustment. It's supposed to be fixed at an appropriate level in the output modules.

Regards,

chazix

chazix, thanks for the confirmation.:thmbsp:

I found that setting the DC-offset was finicky on this receiver - a tiny adjustment went a very long way - but I finally got it to ~0mv on both channels.

avionic, the link to Yamaha service manuals is greatly appreciated.