MRC problem with Zephyr

[Blind Bruce]

I have a Roundhouse 4-4-0 with MRC sound and cannot seem to change the CVs. When I select a CV and push the RD CV on the Zep, it comes back with a no acknowlege error message. There is a brief hiss from the speaker, then nothing. I have the Zeps program output hooked directly to a piece of track and nothing else. I am using "page" mode. All sounds work as described in the factory data sheet I just want to fine tune the loco.

Aside from a defective decoder, what could be wrong?

[cacole]

Nothing is wrong with the Zephyr; it's the MRC decoder, which is extremely limited in what it can do and how it is programmed.

[selector]

You would lose nothing by switching to Ops Mode and trying it that way.  It would be great if you happen to have a DT400 throttle, Bruce, because I could talk you through it off line if that would be of any use to you.

[Blind Bruce]

I beilieve that Dave B hit it on the head. There is no readback! I went ahead and entered a lower number for the sound volume and pressed enter CV. Although I received no confirmation, the sound seems lower.

It is no wonder that MRC decoders are in such small demand.

Thanks to all,

[jeffrey-wimberly]

My recommendation on MRC decoders is to avoid them whenever possible.

[cacole]

 Actually, they are good for leveling legs.   Or, if you grind them up, they make good ballast.  We need a"What MRC decoders are actually good fo" thread.

David B

How about, "Instant, though very short-term, smoke generators."