General/Introduction - Panasonic HL-BD82S Service Manual

HL-BD82S

4 General/Introduction

4.1. System Description
• ELECTRONIC CONTROL.
The control consists of a main power board and a display board. An additional power board is derived from the main one remov-
ing the power supply parts. It has all the functions of the main one to drive the lower cavity in a double oven. The main power
board provides the voltages to the other boards (GND, -5V and -24V for the relays to the lower power board only).
• The three boards share a I2C communication bus (Data and Clock).
• COOKING MODE & TEMPERATURE SELECTORS.
All ovens have one selector for the cooking modes and one for the set temperature, per every cavity. The cooking mode selector
has 4 positions for thermal cavities, 9 for multifunction ones.
• TEMPERATURE SENSOR.
There is one Pt1000 sensor per every oven (two in a double, of course), fixed on the rear wall outside the cavity.
• HEATING ELEMENTS.
Four heaters are available in multifunction ovens while the ring element is missing in the thermal ones. They are combined
together in different ways, depending on the selected mode, but the maximum power never overtakes 3500W.
- UPPER ELEMENT
- LOWER ELEMENT
- RING ELEMENT
- UPPER EXTERNAL ADDITIONAL ELEMENT 775W at 208V (meaning 1032W at 240V).
• CONVECTION FAN.
Convection fan. It works in all convection modes, in Fast Preheat and in Self-Clean. It makes the heat distribution uniform, inside
the cavity. According to the oven model, each cavity can be provided with 0, 1 or 2 fans, reversible or not.
• COOLING FAN SYSTEM.
A cooling fan keeps the internal parts temperature within acceptable values, and removes smoke from the cavity through the
catalyser. There is a 70°C by-pass thermostat that when the temperature overtakes the threshold, switching the cooling fan into
its full speed. This normally occurs during self-clean only.
• OVEN LIGHTS.
Halogen 120V lamps. They turn on when a cooking mode starts or when the door is open. It's also possible to switch the lights on
manually by pressing the light button.
• DOOR LATCH SYSTEM.
A motor actuates the latch mechanism to lock or unlock the door. The motor always rotates in the same direction, and it's the
mechanism that determines the locking or unlocking phases. They take about the same time to complete the half cycle. The door
micro switch is checked every time the latch starts to verify that the door is actually closed. If the door is open, the latch icon
flashes until the door is closed. A changeover micro switch placed right on the motor shaft and actuated by a 180° cam provides
the electronics with the latch position information
3500W at 240V.
3000W at 240V.
2500W at 240V.
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