12Vdc Power Supply; Testing Power Supply - Pratica Chef Express Service Manual

12VDC Power Supply

The DC Power Supply outputs 12V DC to the main control board.

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 show 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.
• If the multimeter registers 12V DC, then power supply is
good.
• If the multimeter registers a voltage of 10% higher or
lower than 12V DC, 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.
Voltage adjustment
Output 12V DC
Power Supply
208 / 240V
89