DLC’s – The Lights Won’t Go Out!

7-29-16-DLC.pdf (9 downloads )
Domelight Controllers can be daunting when they don’t work as expected because of their complicated nature.   This week’s tech bulletin won’t discuss every single detail of those complexities, but rather will identify the parts and pieces and basic troubleshooting techniques for when you’re having a data transfer issue with the unit.
First let’s start out with some images of proper configuration and terminology
1) Main Board Power – Must be separate and only power 4 Power Banks at bottom of board.  If you have a 75W Power Supply, you may daisy chain the main board to an extension board.
2) Logic Supply Power -7.5V only.  These wires must be run from Driver board only.  You may chain two boards together using this method as well so long as you remember to separate Bank and Logic Power.  Highlighted is the Logic Power Supply fuse.
5) Date Output (Top Center of Main Board) – Used to run Cat5 from Main board to Secondary Extension Board.  Microchip is Highlighted
6) Data Input (Bottom Left of Main Board) – Data is transferred via ribbon cable from the DLC-LCD board to the data input of main board.  In the case of an Extension board, data will be run via Cat5 from the data input of the Main Board, to the Data input of the Extension Board.  Microchip is Highlighted.
Possible causes of “Lights won’t turn off”
1)      Bad Network Cable
2)      Bad Network Switch
3)      Bad Switch Port
4)      Bad Ribbon Cable
5)      Bad Relay Fuse
6)      Bad Logic Power Fuse
7)      Bad Bank Power Fuse
8)      Blown 7.5 DLC-LCD Power Supply (Due to improper initial
         configuration, remember to change the jumper on DLC-LCD board
         to 7.5V)
9)      Bad Microchip on Data Input
10)    Bad Microchip on Data Output
11)    Improper wire connection
How to troubleshoot when there are so many potential causes?
1)      Check you wiring
2)      Check 7.5V Jumper on DLC-LCD Board
3)      Check your network connections
4)      Change Ribbon Cable
5)      Change Logic Power Fuse
6)      Swap out Network Cable
7)      Swap out appropriate Microchip
8)      Check Bank Fuses
9)      Check Relay Fuses

10)    Swap out DLC-LCD Board to find out if issue is with DLC-LCD or
Main Board

At first, when facing an error with more than 10 potential causes it can be daunting.  The steps to troubleshoot DLC’s aren’t too dissimilar from anything else; the only major difference with DLC’s is that there are more parts.  Address them one at a time and it’s just like anything else.  Step one – Check Hardware and Software Configurations.  Step two – Swap out potentially defective pieces that could be the cause with a known good unit.  Step 3 – Call for Assistance.