Pratica Forza Express, Service Manual

Page: 67 / 90

61
Testing Power Supply
Warning: Make sure to connect the positive (red) Power Supply wire to terminal 1 and negative
(black) to terminal 2 on the control board. Switching polarities will cause damage to the control
board.
1. Remove both side and top panels from unit.
2. With the unit on, measure across L1 and L2 terminals for AC voltage (208/240) as shown in
the picture below.
•
If the multimeter reads correct line voltage, move on to step 3.
•
If the multimeter does not read line voltage, verify the wires are secure, the store
breaker is not tripped and correct voltage is getting to the unit, or oven fuse is not
blown.
3. Measure the DC voltage in the bottom two terminals labeled V- and V+ as shown in the
picture below.
•
If the multimeter registers 12VDC, then the power supply is good.
•
If the multimeter registers a voltage of 10% higher or lower than 12VDC, adjust the
voltage using the regulator screw located on the side of the terminals.
•
If line voltage is present and there is no DC output, replace the power supply.