Measurements And Adjustments - John Lewis NN-GT578SBJQ OEM 27L JLFSMWG002 Service Manual

11 Measurements and Adjustments

Warning
• Only replace parts with parts from the original man-
ufacturer.
• When the 10 amp fuse is blown due to the operation
of the short switch, you must replace the primary
latch switch and short switch. Then follow the
installation procedures below.
• Interlock switch replacement - When replacing
faulty switches, check the mounting tabs on the
door-hook assembly are not bent, broken or defi-
cient in their ability to hold the switches.
• Refer to the schematic and wiring diagram to ensure
the plug connectors on the wire harness are con-
nected to correct switches.
11.1 Installation of primary latch
switch, secondary latch switch
and short switch.
1. When mounting the primary latch-switch, secondary
latch-switch and short latch-switch to the door hook
assembly. Follow the instructions in <$elemtextfig-
ure 17.
2. NOTE: No specific adjustment during the insulation
of each switch into the door hook is necessary.
3. When mounting the door hook assembly to the oven
assembly, adjust the door hook assembly by moving
it in the direction of the arrow figure 17. Ensuring
the door does not have any play in it. Check for
play by pulling the door assembly. Make sure that
the latch keys move smoothly after adjustment is
completed. Completely tighten the screws holding
the door hook assembly to the oven assembly.
4. Reconnect the short switch, primary switch and sec-
ondary latch switches and check the continuity of
the monitor circuit and latch switches by following
the component test procedures on <$elemtext.
11.2 Measurement of microwave
output
The output power of the magnetron can be determined
by performing the IEC standard test. However, due to
the complexity of the IEC test procedures, it is recom-
mended you test the magnetron using the simple
method outlined below.
Necessary equipment:
• 1 litre beaker.
• Glass thermometer.
• Wrist watch or stop watch.
NOTE: Check the line voltage under load. Low line
voltage lowers the magnetron output. Take the tem-
perature readings and heating time as accurate as pos-
sible.
1. Fill the beaker with exactly one liter of tap water.
Stir the water using the thermometer and record
the waters temperature (Record as T1).
2. Place the beaker on the center of the glass cook
plate.
3. Operate the Microwave for 1 Minute on FULL power.
4. Stir the water again and read the temperature of
the water. (Record as T2).
5. The normal temperature rise at the high power posi-
tion for each model is shown in the table figure 18
figure 17Adjustment of latch switches
RATED OUTPUT
1000W
figure 18Temperature rise
16
SCREW
PRIMARY LATCH
SWITCH
SHORT LATCH
SWITCH
SECONDARY LATCH
SWITCH
SWITCH
SWITCH
GAP < 0.7mm
ACTUATOR LEVER
TEMPERATURE RISE
°
8 C (Degrees centigrade)