System Parts - Bosch HBL 73 Service Manual

1. DISPLAY BOARD. It's mounted on the front
panel, it's the oven brain. It handles the user
interface (display, keyboard and knob), receives
inputs and send information to drive all outputs
through the Power Board.
2. POWER BOARD. It's mounted on the cooling
channel, it provides the Display Board with all its
power lines. It manages the latch, the heaters, the
auxiliary loads following the Display Board
indications. It measures the temperature read by
the sensor.
3. HEATING ELEMENTS (nominal power at 240V).
a. UPPER ELEMENT
b. LOWER ELEMENT
c. RING ELEMENT
d. ADDITIONAL ELEMENT
4. AUXILIARY RELAY BOARD. It's mounted on
the front panel. It provides the working fan dual
speed (only double oven) and the Double Line
Break feature (only for Canadian requirements).

SYSTEM PARTS

3500W
3000W
2500W
1000W