On May 15, 8:34*pm, Wolf K wrote:
On 13/05/2011 9:12 AM, N_Cook wrote:

I'm an electronic engineer asked to repair a number of these DCC control
boards
that apparently plug into/under model train locos. I've found a few failings
testing cold but would like to apply some power to them.
Anyone know of "block diagram" pinning for such units or any technical info?
Boards are 32x30mm with surface mount components , 2x4 way connector, 21 way
conn, 5 x 2way and 1x 4w connector

I've read the thread, and my opinion is that it's hardly worth the
trouble, unless of course you want the "learning opportunity". Without a
model number, it's nearly impossible to say what the board is. A later
post by you suggests that it's a 21-to-8 pin adapter, not a DCC control
board (decoder) as such. If, as you say, some of the solder joints are
cold/defective, fixing them will likely fix the board. OTOH, if it
actually a decoder, then most likely the chip is defective.

The DCC decoders convert rail power (14-18V, 50/60HZ)

If you can't even the basics right about DCC, why bother posting?

locomotive, at about 150KHz IIRC.

Completely wrong again.

I'm not an electronics expert, the above comments are based on my
knowledge of DCC.

Need I say more?

MBQ