Duke DSO 500, Service Manual

Page: 43 / 80

43
INVERTERS
The inverters drive the upper and lower convec-
tion blower motors. These inverters must be
programmed when first installed.
Location and Access
The inverters, Figure 18, are located on the right
side of the oven and mounted to the inside sur-
face ef the rear panel. The right side panel will
need to be removed.
Figure 18. Inverters
Safety Issues
• Electrical supply of 208/240 VAC to the
control transformer when POWER switch
is in ON position
• Main POWER switch and fuses have
208/240 VAC present on the input side
whenever the oven is connected to the
input power source
• Inverters are powered when power cord
is live
Tools required
• Flat blade screwdriver to remove side
panel
• #2 Phillips screwdriver to remove screws
securing inverters to right side of oven
Operational Testing
The inverters drive the upper and lower convec-
tion fans. Operation of the inverters is controlled
by the control board through wires 71-80. Wires
71 through 75 control the upper blower and wires
76 through 80 control the lower blower.
Test Procedure
Refer to the detailed test procedure in the TEST
PROCEDURE section of this manual.
Replacement
Unplug oven from power source. Remove right
side panel. Disconnect wires to the defective
inverter. Remove nuts attaching inverter to panel.
Install new inverter with nuts. Reconnect wires.
Program inverter in accordance with procedure
in APPENDIX A. Install side panel. Plug oven into
power source and recheck operation.
COMPONENT OVERVIEW