High Voltage Diode; Main Relay And Power Control Relay - Samsung CM1629 Service Manual

5-5 High Voltage Diode

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
other direction.

5-6 Main Relay and Power Control Relay

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 in the oven. Set the power level to high.
3. Check continuity between terminals of the relays after Start pad is pressed.
5-7 Adjustment of Primary, Door Sensing and Monitor Switch
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 door sensing 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.
1. When mounting Primary switch and Interlock Moni-
tor switch to Latch Body, consult the figure.
NOTE : No specific adjustment during installation
of Primary switch and Monitor switch to the
latch body is necessary.
2. When mounting the Latch Body to the oven assem-
bly, adjust the Latch Body by moving it so that the
oven door will not have any play in it. Check for play
in the door 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.
3. Reconnect to Monitor switch and check the continu-
ity of the monitor circuit and all latch switches again
by following the components test procedures.
4. Confirm that the gap between the switch housing
and the switch actuator is no more than 0.5mm
when door is closed.
5. Interlock Switch Replacement - When replacing
faulty switches, be sure switch mounting tabs are
not bent, broken or otherwise deficient in their abil-
ity to secure the switches in place.
PRECAUTION
Primary S/W
COM NO BRN
WHT
COM NO
BLU
BRN/ORG
Primary S/W
Monitor S/W (COM-NC)
Monitor S/W (COM-NO)
Door Sensing S/W
- 18 -
Latch-Body
Door Sensing S/W
Lever-Switch/U
Interlock Monitor S/W
Primary S/W
Lever-Switch/L
Interlock Monitor S/W Door Sensing S/W
NC
RED/YEL
COM NO PINK/PINK COM
WHT
NC RED/WHT
BRN/AZR
COM NO
BRN
Door Open
∞
0
∞
∞
NO ORG
ORG
Door Closed
0
∞
0
0