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No Display - control is
Switch Mode Power Supply (SMPS), User
blank
Interface (UI)
SUGGESTED CORRECTIVE ACTION PROCEDURE
NOTE: Before starting any test, cycle power to the oven (power Off, wait 10
seconds, and then power On).
1.
Unplug oven or disconnect power.
2.
Remove plastic cover from UI. Check connection from display to UI. If the
display is firmly connected, go to Step 3. If display connection is loose,
reconnect and go to Step 10.
3.
Check wiring from main line to SMPS (CONN 7).
N L2 L1
HMI Left
CONN7
CONN2
WH
6
2
SMPS
5
1
4
14V DC
3
BK
15 W
1
4.
Check connection from wiring harness to UI (J15).
5.
Check proper voltage input at J15-2 (GND) to J15-4 (14 VDC) on the UI
by completing the following steps:
6.
Connect voltage measurement equipment to J15-2 and J15-4 on UI.
7.
Plug in oven or reconnect power.
8.
Measure voltage and confirm voltage reading is 14 VDC. If voltage is
correct, unplug oven or disconnect power and go to Step 13. If voltage
is not correct, go to Step 9.
9.
Unplug oven or disconnect power. Replace the SMPS.
10. Reassemble all parts and panels before operating.
11. Plug in oven or reconnect power.
12. Check for control board display. If still no display, unplug oven or
disconnect power.
13. Replace HMI-Central/UI board.
Failure/Error Display Codes
Control Panel Assembly
Speaker
BK
J8
1
HMI-C/
RD
J4
J6
User Interface
J5
J7
HMI Right
J15
1 2 3 4
EOL
1 2
YL
BU
YL
OR
OR
YL
BU
OR
YL
P26
1 2 3 4 5
Microwave Appliance
Manager
14. Reassemble all parts and panels before operating.
15. Plug in oven or reconnect power. If the UI was replaced, follow the on-
screen prompts to select the model number.
16. Verify operation is normal. If problem persists, replace the Control Panel
Assembly and repeat steps 14 through 16.
7
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