Panasonic NN-V659WB Service Manual page 2

This service information is designed for experienced repair technicians only and is not designed for use by the general public. It does not con-
tain warnings or cautions to advise non-technical individuals of potential dangers in attempting to service a product. Products powered by elec-
tricity should be serviced or repaired only by experienced professional technicians. Any attempt to service or repair the product dealt with in
this service information by anyone else could result in serious injury or death.
* This product should be serviced only by trained, qualified personnel.
This service manual covers products for following markets.
When troubleshooting or replacing parts, please refer to the country identifications shown below for your applicable product specification.
BPQ ... for the United Kingdom
DANGER OF HIGH VOLTAGE AND HIGH TEMPERATURE (HOT/LIVE) OF THE INVERTER POWER SUPPLY(U)
This Inverter board looks like a regular PCB, however, this PCB drives the magnetron tube with extremely high voltage and high current.
IT HAS: 1: Very high voltage and high current circuit.
It functions the same as the high voltage transformer and high voltage capacitor in ordinary microwave ovens.
2. aluminium heat sink is very hot.
3. Very high voltage may remain in the circuitry even when the oven is off. High voltages may remain in the capacitors on the
board.
DO NOT: *1. Do not touch the circuitry as it becomes very hot (high voltage). Even when replacing board, extreme care should be taken to
avoid possible electric shock. High voltage may remain in the circuit.
*2. Do not touch aluminium heat sink because it is very hot in high voltage and also very hot in high heat energy.
*3. Do not try to repair the Inverter PCB as this can be very dangerous. Replace the whole High Voltage Inverter Circuit(U) unit and
return fully re-packed with the original shopping box and shipping materials.
*4. Do not try to adjust or tamper with the preset volume on the Inverter board because it is very dangerous to adjust it without
proper test equipment.
*5. Do not test oven while Inverter grounding strip or screws are loose. It is very dangerous to operate the H.V. Inverter Circuit (U)
with loose mounting screws or if improperly grounded.
H.V. INVERTER(U) *3
INVERTER SUPPORT
BRACKET
INVERTER WARNING
INVERTER POWER SUPPLY DIAGRAM
HEAT SINK (RECTIFIER BRIDGE)
CHOKE COIL
SAND BAR RESISTOR
LEAD WIRE
CUSTOM I.C.
PHOTO COUPLER
INVERTER WARNING DO NOT TOUCH *4
LABEL
GROUNDING PLATE *5
WARNING
WARNING
NEW H.V.
DO NOT TOUCH (HOT/HIGH VOLTAGE) *2
CN 701
CURRENT TRANSFORMER
DO NOT REPAIR. REPLACE WHOLE H.V.INVERTER(U)
2
HIGH VOLTAGE AREA*1
FILM CAPACITORS
HIGH VOLTAGE
TRANSFORMER
PRIMARY WINDINGS
SECONDARY WINDINGS
HIGH VOLTAGE DIODES
CN 703
HIGH VOLTAGE CAPACITORS