LG MC-807SLR Service Manual ▷ View online
A. PRIMARY INTERLOCK SWITCH TEST
When the door button is slowly depressed with the
door closed, an audible "click" should be heard at
the same time or successively at intervals. When
the button is slowly released, the latches should
activate the switches with an audible "click".
If the latches do not activate the switches when the
door is closed, the switches should be a adjusted in
accordance with adjustment procedure. Disconnect
the wire lead from the primary switch. Connect the
multimeter leads to the common (COM) and
normally open (NO) terminal of the switch. The
meter should indicate an open circuit in the door
open
condition.
When the door is closed, the meter should indicate
a closed circuit.
When the primary switch operation is abnormal,
make the necessary adjustment or replace the
switch only with the same type of switch.
door closed, an audible "click" should be heard at
the same time or successively at intervals. When
the button is slowly released, the latches should
activate the switches with an audible "click".
If the latches do not activate the switches when the
door is closed, the switches should be a adjusted in
accordance with adjustment procedure. Disconnect
the wire lead from the primary switch. Connect the
multimeter leads to the common (COM) and
normally open (NO) terminal of the switch. The
meter should indicate an open circuit in the door
open
condition.
When the door is closed, the meter should indicate
a closed circuit.
When the primary switch operation is abnormal,
make the necessary adjustment or replace the
switch only with the same type of switch.
B. SECONDARY INTERLOCK SWITCH TEST
Disconnect the wire lead from the secondary switch.
Connect the multimeter leads to the common (COM)
and normally open (NO) terminals of the switch. The
meter should indicate a open condition. When the
door is closed, meter should indicate an closed
circuit. When the secondary switch operation is
abnormal, make the necessary adjustment or
replace the switch only with the same type of switch.
Connect the multimeter leads to the common (COM)
and normally open (NO) terminals of the switch. The
meter should indicate a open condition. When the
door is closed, meter should indicate an closed
circuit. When the secondary switch operation is
abnormal, make the necessary adjustment or
replace the switch only with the same type of switch.
C. MONITOR SWITCH TEST
Disconnect the wire lead from the monitor switch.
Connect the multimeter leads to the common (COM)
and normally close (NC) terminals of the switch. The
meter should indicate closed circuit in the door open
condition. When the door is closed, meter should
indicate an closed circuit.When the monitor switch
operation is abnormal, replace the same type of
switch.
Connect the multimeter leads to the common (COM)
and normally close (NC) terminals of the switch. The
meter should indicate closed circuit in the door open
condition. When the door is closed, meter should
indicate an closed circuit.When the monitor switch
operation is abnormal, replace the same type of
switch.
Interlock continuity Test
5-8
COMPONENTS
TEST PROCEDURE
RESULTS
SWITCHES
Check for continuity of the switch
(Wire leads removed)
with a Multi-meter
Primary
Switch
Switch
Monitor
Switch
Switch
Secondary
Switch
Switch
NOTE: After checking for the continuity of switches, make sure that are
correctly connected.
Door
open
open
Door
close
close
COM
NO
COM
NC
COM
NO
WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION
EMISSION,REPLACE ONLY WITH IDENTICAL REPLACEMENT RARTS.
TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF FOR PRIMARY / SECONDARY SWITCH
TYPE NO. SZM-V 16-FA-62 OR VP-532A-OF FOR MONITOR SWITCH
TYPE NO. SZM-V 16-FA-62 OR VP-532A-OF FOR MONITOR SWITCH
Component Test Procedure
5-9
CAUTIONS
1. DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE OUT
CASE FROM THE UNIT. PROCEED WITH THE TEST ONLY AFTER DISCHARGING THE HIGH
VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE
HIGH VOLTAGE TRANSFORMER. (SEE PAGE 5)
VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE
HIGH VOLTAGE TRANSFORMER. (SEE PAGE 5)
2. ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD (1 LITER OF
WATER IN CONTAINER) IN THE OVEN.
COMPONENTS
TEST PROCEDURE
RESULTS
HIGH VOLTAGE
TRANSFORMER
(Wire leads removed)
TRANSFORMER
(Wire leads removed)
1. Measure the resistance.
(Multi-meter scale: R X 1)
• Primary winding
• Primary winding
Approx: 1.4
Ω
• Secondary winding
Approx: 90
Ω
• Filament winding
Less than: 0.1
Ω
2. Measure the resistance.
(Multi-meter scale: R X 1000)
• Primary winding to ground
• Primary winding to ground
Normal:
∞
.
• Filament winding to ground
Normal:
∞
.
MAGNETRON
1. Measure the resistance.
(Wire leads removed)
(Multi-meter scale: R X 1)
• Between filament terminals
• Between filament terminals
Normal: Less than 1
Ω
2. Measure the resistance.
(Multi-meter scale: R X 1000)
• Filament to chassis.
• Filament to chassis.
Normal:
∞
.
Secondary
Winding
Filament
Winding
Terminal
Filament
Winding
Terminal
Primary
Winding
This device is to be serviced only by properly qualified service personnel.
Consult the Service Manual for proper service procedures to assure continued safety operation and for precautions to
be taken to avoid possible exposure to excessive microwave energy.
Consult the Service Manual for proper service procedures to assure continued safety operation and for precautions to
be taken to avoid possible exposure to excessive microwave energy.
SAFETY PRECAUTIONS
PRECAUTIONS TO BE OBSERVED
BEFORE AND DURING SERVICING TO
AVOID POSSIBLE EXPOSURE TO
EXCESSIVE MICROWAVE ENERGY
A) Do not operate or allow the oven to be operated with the door open.
B) Make the following safety checks on all ovens to be serviced before activating the magnetron or other
microwave source, and make repairs as necessary; (1) Interlock operation, (2) proper door closing,
(3) seal and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges
and latches, (5) evidence of dropping or abuse.
(3) seal and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges
and latches, (5) evidence of dropping or abuse.
C) Before turning on microwave power for any service test or inspection within the microwave generating
compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment,
integrity, and connections.
integrity, and connections.
D) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation and
transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual before
the oven is released to the owner.
the oven is released to the owner.
E) A microwave leakage check should be performed on each oven prior to release to the owner.
CAUTION
MICROWAVE RADIATION
DO NOT BECOME EXPOSED TO RADIATION FROM THE MICROWAVE
GENERATOR OR OTHER PARTS CONDUCTING MICROWAVE ENERGY.
This device is to be serviced only by properly qualified service personnel.
Consult the Service Manual for proper service procedures to assure continued safety operation and for precautions to
be taken to avoid possible exposure to excessive microwave energy.
Consult the Service Manual for proper service procedures to assure continued safety operation and for precautions to
be taken to avoid possible exposure to excessive microwave energy.
SAFETY PRECAUTIONS
PRECAUTIONS TO BE OBSERVED
BEFORE AND DURING SERVICING TO
AVOID POSSIBLE EXPOSURE TO
EXCESSIVE MICROWAVE ENERGY
A) Do not operate or allow the oven to be operated with the door open.
B) Make the following safety checks on all ovens to be serviced before activating the magnetron or other
microwave source, and make repairs as necessary; (1) Interlock operation, (2) proper door closing,
(3) seal and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges
and latches, (5) evidence of dropping or abuse.
(3) seal and sealing surfaces (arcing, wear, and other damage), (4) damage to or loosening of hinges
and latches, (5) evidence of dropping or abuse.
C) Before turning on microwave power for any service test or inspection within the microwave generating
compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment,
integrity, and connections.
integrity, and connections.
D) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation and
transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual before
the oven is released to the owner.
the oven is released to the owner.
E) A microwave leakage check should be performed on each oven prior to release to the owner.
CAUTION
MICROWAVE RADIATION
DO NOT BECOME EXPOSED TO RADIATION FROM THE MICROWAVE
GENERATOR OR OTHER PARTS CONDUCTING MICROWAVE ENERGY.