General Information For Service; General Precautions In Use; Trial Operation; Features And Specifications Features - GE JVM1790BK Service Manual

GENERAL INFORMATION FOR SERVICE

GENERAL PRECAUTIONS IN USE

A. Never operate the unit when it is empty.
Operating the oven with no load may shorten the
life of the magnetron. Whenever cooking dry foods
(dried fish, bread, etc.) or a small amount of food,
be sure to put a glass of water into the cooking
compartment. The glass turntable may become hot
after operating, be careful when touching it.
B. Aluminum foil should be avoided because it will
disrupt cooking and may cause arcing. However,
small pieces may be used to cover some parts of
food to slow the cooking. Any aluminum foil used
should never be closer than 2.5 cm to any side wall
of the oven.

TRIAL OPERATION

After installation, the following sequences and results
should be checked carefully.
A. Put a container filled with water (about 1 liter) into
the oven, and close the door tightly.
B. Set cooking time for 10 minutes by touching "1"
and then "0" three times. "1, 0, 0, 0" appears in
the display window.
C. Touch the START key.
Make sure the cavity light comes on. The unit will
begin cooking and the display window will show the
time counting down by seconds.
D. After about 5 minutes, make sure the primary
interlock switch, the secondary interlock switch and
the interlock monitor switch operate properly by
opening and closing the door several times. Touch
the START key each time the door is closed.
E. Continue operating the unit. Four long beep sound
signal is heard when the time is up. The unit will
shut off automatically.
F. Confirm the water is hot.
G. Finally, measure the output power according to
"POWER OUTPUT MEASUREMENT" on
page 7-3.
FEATURES AND SPECIFICATIONS
FEATURES
A. The safety systems incorporated in this model are:
(1) Primary interlock switch
(2) Secondary interlock switch
(3) Interlock monitor switch
(4) Choke system
(5) Magnetron thermostat
(6) Oven cavity thermostat
(Note: This thermostat located on the oven
cavity will open and stop the unit from operation
only if a high temperature is reached, such as,
a fire created by overcooking food.)
B. Any one of 10 power output levels ranging 100W to
1000W can be selected by the touch control and
electronic computer system.
STANDARD TEST LOAD
The standard test load is one liter (1000ml.) water with
starting temperature of 59°F ~ 75°F in a 1000ml
beaker.
(DO NOT USE ANY OTHER LOAD OR DISH AS
RESULTS WILL VARY FROM STANDARD.)
PERFORMANCE TEST FOR MICROWAVE
1. Use Glass Tray and the beaker WB64 x 0073.
2. Record initial water temperature.
3. Run at high power for 2:03.
4. Record end water temperature.
The minimum difference between the initial and
ending temperature should be: 38°F @ 120V
TO PREVENT ELECTRICAL SHOCK. USE EXTREME
CAUTION WHEN DIAGNOSING OVEN WITH OUTER
CASE REMOVED AND POWER "ON". THE HIGH
VOLTAGE SECTION OF THE POWER SUPPLY
INCLUDING FILAMENT LEADS IS 4000 VOLTS
POTENTIAL WITH RESPECT TO GROUND.
6-1