– 31 –
VFD Operating Voltage
Note:
To gain better access to components, remove
the wires that plug onto the large relays on the
Relay Board (See
Relay Board
.), and cut the wire
tie that the Smart Board
CN103 wire harn ess (See
Smart Board
.), is routed through.
Check voltage at Smart Board CN103 pins 4 and 5.
• If 5 VDC is present, replace Smart Board.
• If 5 VDC is not present, check the harness
between the Smart Board and Power Supply
Board. If OK, replace Power Supply Board.
Relay Operating Voltage
Note:
To gain better access to components, remove
the wires that plug onto the large relays on the
Relay Board. (See
Relay Board
.
) Cut the wire tie that
the Smart Board
CN103 wire harn ess (See
Smart
Board
.) is routed through.
Check voltage at Smart Board CN103-03 and CN
103-05.
• If 12 VDC is present, replace Smart Board.
• If 12 VDC is not present, check the harness
between the Smart Board and Power Supply
Board. If OK, replace Power Supply Board.
Back Light or Buzzer Operating Voltage
Note:
To gain better access to components, remove
the wires that plug onto the large relays on the
Relay Board. (See
Relay Board
.
) Cut the wire tie that
the Smart Board
CN103 wire harn ess (See
Smart
Board
.) is routed through.
Check voltage at Smart Board CN103 pins 2 and 5.
• If 12 VDC is present, replace Smart Board.
• If 12 VDC is not present, check the harness
between the Smart Board and Power Supply
Board. If OK, replace Power Supply Board.
Board Spacer
Retainer
Retainer
Disconnect
Disconnect
Jumper Harness
Smart Board
To remove the Smart Board:
1. Disconnect power to the oven.
2. Remove the control panel assembly.
(See
Control Panel Removal
.)
3. Remove the Relay Board.
(See
Relay Board Removal
.)
4. Disconnect wire harnesses at CN102, CN15, and
CN10.
5. Remove the 2 Phillips-head screws from the
bottom of the Smart Board.
6. Lift and remove the Smart Board from the top 2
retainers.
Note:
When replacing the Smart Board, transfer the
board spacer to the replacement board.
