A.O. Smith BTX 100 Service Handbook page 40

uim ribbon Cable ConneCtion
Service Notes:
The Ribbon Cable that connects the Button Pad overlay to the uIM Circuit Board must be plugged in exactly
as shown in Figure 36 on page 37. The metal crimp connections in the Ribbon Cable plug must be facing away
from the uIM circuit board. These metal crimp connections are only visible on one side of the plug, see Figure
37 below. There are six flat metal pins on the uIM circuit board J3 socket. Ensure all six pins are fully inserted
into the Ribbon Cable plug whenever removing or installing the uIM or the Button Pad overlay.
It is possible to connect the Ribbon Cable Plug incorrectly. It can be plugged in upside down (with the crimp
connections facing the circuit board) or it can be plugged in with less than all six of the J3 socket pins inserted
into the plug.
Failure to connect this Ribbon cable exactly as shown Figure 36 on page 37 when servicing will render the
user input buttons inoperable. This should be checked whenever the nature of the service complaint is an
inoperable or unresponsive Control System display, uIM, or user input buttons, See uIM Is Inoperable on
page 57
METAL CRIMP
CONNECTIONS
38
RIBBON CABLE PLUG END
FRONT SIDE
Figure 37
Servicing should only be performed by a Qualified Service Agent
BACK SIDE