ARCHIVED FORUM -- March 2012 to February 2022READ ONLY FORUM
This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
Hi All,
just working on my BG4000 which behaves erratically - if the carriage moves to the 30cm drop-down point the arm won't lower ?
reading through the technical information at the end of the SM it mentioned minor changes to the BL and DR circuit because of i troduction of a new bulb for the detector arm and suggested changing
1R30 from 15 to 22 ohm and also remove the 50kOhm trimmer mounted on the solder side of board #1
from which serial number should those measures be implemented ?
thank you for some info on that matter
ALF
Alf
Do you have a copy of Solderons BG4000 course notes? they give some very usefull insights into the unit.....
Craig
Thanks for your reminder Craig, indeed I have these notes !
in the meantime I followed the faultfinding SM flowchart....and it was the solenoid switch that needed to attention.
after some fine-sanding of the top contact the arm lowers again.
only wish I could take all of those contact springs out and gold-plate them !