Panasonic NN-CT890SBPQ, Service Manual

Page: 3 / 45

NN-CT890SBPQ
3
2 Inverter Warning
The inverter board looks like a regular PCB, however, this PCB
drives the magnetron tube using very high voltages and cur-
rent.
It has
1. Very high voltage and high current
2. An Aluminium heat sink that becomes very hot
3. The capacitors on the inverter circuit will contain a high
voltage charge even when the oven is not operating.
Do not
1. Do not touch the circuitry as it contains very high volt-
ages. When replacing the board please take extreme
care to avoid possible electric shock. High voltages may
remain in the circuit.
2. Do not touch the aluminium heat sink as it will become
very hot. It also contains high voltages.
3. Do not attempt to repair the inverter PCB as this can be
very dangerous. Replace the high voltage inverter circuit
as a complete unit.
Return the old unit fully repacked
in the original shipping box and completed paper
work.
4. Do not adjust or tamper with the preset volume on the
inverter board. It is very dangerous to adjust this preset
without proper test equipment.
5. Do not test the oven while the inverter grounding strip or
screws are loose. It is very dangerous to operate the
inverter circuit board without a proper ground connection.
Inverter Grounding
Figure 1
Inverter PCB layout
Figure 2
3 Feature Chart
Function BPQ
Microwave 6
Grill 3
Convection 17
Combi Yes
Sensor Reheat 0
Sensor Cook 5
Sensor Combi 8
Sensor Crisp -
Weight Defrost 3
Weight Combi 5
Weight Reheat -
Weight Cook -
Memory Cook 3
Weight Crisp -
Stage Cooking 3 stage
Delay / Stand Yes
More / Less Yes
Kg -> lb/oz Yes
Clock 24H
Word Prompt English
Step by Step LED