[Premium-Rx] Another DMS-102-5 ?

[Henry Kolesnik]

I haven't had any luck in finding any info so  I opened the Nixie 
display case  and could not see or smell anything burnt.  I noticed one 
nixie module was a bit loose so I re-seated it and all the rest, voila, 
all except one came up.  I made a module swap and now then they all 
worked for about a day. Now, sometimes with the correct frequency 
displayed and other times with 8000.N, but only the last digit will 
tune. Probably  corroded contacts and poor seating on the first problem. 
The second problem may be a cold solder joint since pressure on some 
boards makes it work for a short time.
This has DAFC and I know that stands for digital automatic frequency 
control but I'm not too sure on its use.  There are two rotary swtiches, 
with one labelled DAFC Last Digit with postions 0 to 9, it doesn't have 
any effect.  The other rotary labelled MODE with four postions Normal 
Display: DAFC or Tune and Decimal Shift: Tune or DAFC.  In  both Normal 
Display positions the Nixie display is medium brigtness and one decimal 
place shown.  On Decimal Shift in either position the display flashes on 
and off at high brightness and shows two decimals places.  The Last 
Digit has no effect.  Any tips on what DAFC is supposed to do and what 
is an indication that its working properly?
Still looking for a schemactic.
This unit is quite sensitive and I pick up many weak BCB stations as 
well as beacons with a short antenna.
tnx

73
Hank WD5JFR