Viking DEDO127T Service Manual page 61

Diagnostics
Relay Board Operation
The previous page covered the connections between the Main Control Board and the Relay board. When
a cook cycle is selected, the Relay for the required element and the Line break relay will energize. If you
suspect a faulty or defective element or relay board, run the built-in diagnostics to test each individual element.
All five elements (Four on some select models) can be checked individually in the test mode.
The relay board operates on a supply voltage of 240 volts. FIG A shows the main power connections to the
relay board. If there is a problem with the relay board not operating, check for the proper voltage to the board
before proceeding.
Power Connection for relay board
BAKE (Inner)
When the Main Control Board calls for the Inner Bake element, K10 is energized. FIG A shows the K10 relay
activated. FIG B shows a close-up of the P9 connector. L1 (Red) comes into the P9 connection on the relay
board. With the relay closed, L2 is sent to the inner Bake element. The Inner Bake element draws 6.25 amps.
K10 K11 K12 K13 K14
To Inner Bake From Main Terminal
element Block L1
Common to all
elements
All the elements are supplied L2 (Black) through
the Line break relay. FIG C shows the Line break relay
activated. The yellow wire is the common L2 power to
all the elements. The Black wire is from the Main Terminal
From main terminal
block (L2). Place your amprobe on either the black or
Block L2
yellow wire to test the draw of the element
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© 2008 Viking Preferred Service