Viking Designer DEDO530T, Service Manual

Page: 60 / 73

Diagnostics
© 2008 Viking Preferred Service
60
Relay Board – Main Control connections
Connection between Main Control Board
As described on the previous pages, the main logic resides in the Main Control board. When the oven receives
an input from the end user, the Main control board will send a signal to the relay board for the
appropriate action. The relay board is connected to the main control board via a 14-pin connector.
FIG A
shows the connection on the Main Control Board for the relay cable. FIG B shows the connection on P4 of the
relay board from the Main Control board. If you receive the RELAY ERROR code during a cook cycle, check to
make sure that the connection between the two boards is secure.
Pin identifier
Pin 1 = Input – Serial Data from Main Control Board
Pin 3 = Input – Data clock from Main Control Board
Pin 5 = Input – Start Enable from Main Control Board
Pin 7 = N/C – Not used
Pin 9 = Output – Serial data return from Main Control Board
Pin 11 = Input – Safety AC wiggler input from Main Control Board
Pin 13 = Input – Redundant Door lock Motor Driver signal from main Control Board
Pin 2-14 are tied to Ground
NOTE:
If the Main Control Board is replaced, make sure that you reconnect the proper connection cable from the
proper relay board(s). If you reverse the connections on the double oven and start a cook cycle in one cavity,
the other relay board will activate and the opposite oven will begin to heat. The cooling fan for the selected oven
however will not operate. A COOLING FAN error will be displayed within 10 seconds. If you receive this error
after changing a main Control Board, check to make sure of the proper connections.
Upper Oven Lower Oven