Samsung CE1279 Alignment and Adjustments

Samsung Electronics

5. Alignment and Adjustments

5-1 High Voltage Transformer

5-2 Low Voltage Transformer

5-3 Magnetron

5-1

1. Remove connectors from the transformer terminals
and check continuity.

2. Normal resistance readings are as follows:

(Room temperature = 20ûC)

1. Continuity checks indicate only an open filament
or a shorted magnetron. To diagnose an open

filament or shorted magnetron, do the following:

2. Isolate the magnetron from the circuit by
disconnecting its leads.

3. A continuity check across the magnetron filament
terminals should indicate one ohm or less.

4. A continuity check between each filament terminal
and the magnetron case should read open.

1. The low voltage transformer is located on the
base plate.

2. Remove the low voltage transformer from the
base plate and check continuity.

3. Normal resistor readings a shown in the table.

PRECAUTION

1. High voltage is present at the high voltage terminals during any cook cycle.

2. Do not attempt to measurement the high voltage.

3. Before touching any oven components or wiring, always unplug the oven and discharge the high voltage capacitor.

Filament Terminals

Secondary

Terminal

Primary
Terminals

MODEL

CE1279KSE

Secondary Approx. 96Ω

Filament Approx.0Ω
Primary Approx.1.58Ω

Terminals Resistance

1~2(11V) 0.56Ω
1~3(Input) 77.27Ω
4~5(Output 17.5V) 1.39Ω
5~6(Output 7.3V) 0.6Ω
7~8(Output 3.2V) 0.61Ω
8~9(Output 2.7V) 0.51Ω

Cooling Fins

Gasket Plate

Magnetron Antenna

Samsung Electronics

5-4 High Voltage Capacitor

5-5 High Voltage Diode

5-6 Main Relay and Power Control Relay

5-7 Adjustment of Primary Switch, Door Sensing Switch and Monitor Switch

5-2

1. Check continuity of the capacitor with the meter set at the highest resistance scale.

2. Once the capacitor is charged, a normal capacitor shows continuity for a short time, and then indicates 9MΩ.

3. Shorted capacitor indication: continuity.

4. Open capacitor noication constant 9MΩ.

5. Resistance between each terminal and chassis should read infinite.

1. Isolate the diode from the circuit by disconnecting its leads.

2. With the ohm-meter set at the highest resistance scale, measure across the diode terminals. Reverse the

meter leads and read the resistance.

A meter with 6V, 9V or higher voltage batteries should be used to check the front-to back resistance of the
diode. (Otherwise an infinite resistance may be read in both directions.) The resistance of a normal diode

will be infinite in one direction and several hundred KΩ in the reverse direction.

1. When mounting primary switch and interlock

monitor switch to latch body, consult the figure.

2. No specific adjustment is necessary during

installation of primary switch and monitor
switch to the latch body is necessary.

3. When mounting the Latch Body to the oven

assembly, adjust the Latch Body by moving it so
that the oven door has vo "play". 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 latch body to the oven assembly.

4. Reconnect to Monitor switch and re-check that

the the monitor circuit and all latch switches are
secured.(see components test procedures).

5. Confirm that the gap between the switch

housing and the switch actuator is no more than

0.5mm when door is closed.

1. The relays are located on the PCB Ass'y. Isolate them from the main circuit by disconnecting the leads.

2. Operate the microwave oven with a water load. Set the power level to "high"

3. Check continuity between terminals of the relays after the start pad is pressed.

Precaution

For continued protection against radiation hazard, replace parts in accordance with the wiring diagram and be sure to use the
correct part number for the following switches: Primary and secondary interlock switches, and the interlock monitor switch
(replace all together). Then follow the adjustment procedures below. After repair and adjustment, be sure to check the continuity
of all interlock switches and the interlock monitor switch.

Alignment and Adjustments

Door Open Door Closed

Primary switch ∞ 0
Monitor switch (COM-NC) 0 ∞
Monitor switch (COM-NO) ∞ 0

Door Sensing S/W

∞

0

Primary Interlock Switch

Lever Door(B)

Body Latch

Door Sensing
Switch

Guide switch

Interlock Monitor
Switch