GE JES2251SJ Technical Service Guide

3
DANGER OF HIGH VOLTAGE AND HIGH TEMPERATURE (HOT/LIVE) OF THE INVERTER POWER SUPPLY (U)
INVERTER WARNING
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 circuits.
It functions the same as the high voltage transformer and high voltage capacitor in ordinary
microwave ovens.
2. Aluminum heat sink that is energized with very high voltage and high heat energy.
3. Very high voltage which may remain in circuitry even when oven is off. High voltage charge
may remain in the capacitors on the board.
DO NOT:
* 1. Do not touch circuitry because it has very hot (high voltage) circuitry. Even when replacing
board, extreme care should be taken to avoid possible electric shock hazards. High voltage
charge may remain in circuits.
* 2. Do not touch aluminum heat sink because it is energized with very high voltage and is
also very hot in high heat energy.
* 3. Do not try to adjust or tamper with preset control on the inverter board because it is very
dangerous to adjust without proper test equipment.
* 4. Do not test oven while inverter grounding plate or screws are loose. It is very dangerous to
operate H.V. inverter Circuit (U) with loose mounting screws or if improperly grounded.
* 5. Do not try to repair inverter PCB because it is very dangerous to repair. Replace as a
complete High Voltage inverter Circuit unit and return fully re-packed in original shipping
box and shipping material.
NEW H.V.
INVERTER POWER SUPPLY
H.V. INVERTER(U)
INVERTER
BRACKET
GROUNDING
PLATE
HEAT SINK
DANGER OF HIGH VOLTAGE
AND HIGH TEMPERATURE
HOT/LIVE OF HEAT SINK
IGBT
CHOKE COIL
RECTIFIER BRIDGE
HIGH VOLTAGE
TRANSFORMER
CN702
(AC 120V)
DO NOT
ADJUST VR701
SAND BAR
RESISTOR
CN701
(PULSE 5V)
SHORT FOR DISCHARGING HIGH
VOLTAGE CHARGE REMAINS IN
HIGH VOLTAGE CAPACITORS
HIGH VOLTAGE
CAPACITORS
HIGH VOLTAGE CHARGE
REMAINS IN HIGH VOLTAGE
CAPACITORS
DO NOT TOUCH
CN703
(HIGH VOLTAGE)
HIGH
VOLTAGE
DIODES
SECONDARY
WINDINGS
FILM
CAPACITORS
PRIMARY
WINDINGS

GE JES2251SJ Specifications

General

Brand	GE
Model	JES2251SJ
Category	Microwave Oven
Language	English