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Model
MC-785BC
Pages
36
Size
917.87 KB
Type
PDF
Document
Service Manual
Brand
Device
Microwave Oven
File
mc-785bc.zip
Date

LG MC-785BC Service Manual ▷ View online

Operating Sequence
8
The following is a description of component functions
during oven operation.
PLUG THE POWER
CORD INTO AN
ELECTRIC OUTLET
CLOCK
SET THE
CORRECT
HOUR
SET THE
CORRECT
MINUTE
CLOCK
STOP/CLEAR
DESIRED
POWER
LEVEL
DESIRED
COOKING
TIME
START
STOP/CLEAR
DESIRED
DEFROST
CATEGORY
DESIRED
COOKING
WEIGHT
START
DESIRED
POWER
LEVEL
DESIRED
COOKING
TIME
DESIRED
POWER
LEVEL
START
DESIRED
COOKING
TIME
Stage 1
Stage 2
GRILL OR
CONVECTION OR
COMBINATION
DESIRED
COOKING
TIME
STOP/CLEAR
DESIRED
COOKING
TIME
START
1. Setting the clock
2. Cooking (MICROWAVE POWER)
3. Multi Stage Cooking 
4. Grill Cooking 
5. Convection Cooking 
STOP/CLEAR
DESIRED
CONVECTION TEMP
(150°C~200°C)
START
GRILL
DESIRED
CONVECTION TEMP
(150°C~250°C)
GRILL
OR
6. Combination Cooking 
START
DESIRED
COOKING
TIME
STOP/CLEAR
DESIRED
CONVECTION TEMP
(150°C~250°C)
START
DESIRED
COOKING
TIME
7. Auto Weight Defrost
8. Auto Cook
9. Child Lock
10. Quick Start
11. More and Less
STOP/CLEAR
DESIRED
COOKING
WEIGHT
START
STOP/CLEAR
STOP/CLEAR
(Touch and Hold)
STOP/CLEAR
STOP/CLEAR
(Touch and Hold)
START
STOP/CLEAR
LESS
START
OR
PROGRAMME
DESIRED
AUTO COOK
AND 
CONVECTION
MODE
STOP/CLEAR
MORE
DESIRED
AUTO COOK
CATEGORY
DESIRED POWER
LEVEL
(20%,40% or 60%)
OR
STOP/CLEAR
COMBINATION
Conditions
Beep sound
• Function button touched.
• Cooking stage changed.
—  —
• End of cooking
—  —  —
• Error
—  —  —
• Pass by half at auto weight defrost
—  —  —  —  —
To Pre - Heat
To Cook
NOTE : Beep Sound
• The beep sound is activated under the following
condition.
This oven has a CHILD LOCK feature.
To Set CHILD LOCK
"L" appears on the display and you can't input any key.
To Cancel CHILD LOCK
SCHEMATIC DIAGRAM
9
MICROWAVE 
GRILL/CONV. OVEN
DIAGRAM  SCHEMATIC
PRIMARY
SWITCH
BN
RD
RD
NO
MONITOR
SWITCH
COM
7 6 5 4 3 2 1
OVEN
THERMOSTAT
MAGNETRON
THERMOSTAT
BL
BL
N
L
O.L
F.M
T.T.M
YL
YL
WH
BN
WH
RD
10A
NOISE
FILTER
G   -   Y
INPUT
POWER
P O W E R
T R A N S
1
2
3
1 2 3
GN
GN
SECONDARY
SWITCH
PK
WH
WH
MAGNETRON
H.V DIODE
CAPACITOR
H.V
H.V
FUSE
0.8A
RD
RD
RD
F
FA
BL
BL
BL
NC
BN
BL
RD
RD
WH
SOLENOID
YL
BL
WH
RD
RD
RD
TRANSFORMER
RELAY 1
GRILL HEATER
YL
CONVECTION HEATER
RELAY 5
RELAY 2
230VAC
24VAC
COM.
YL
RELAY 4
RELAY 3
YL
WH
YL
RD
THERMISTOR
PCB
ACHTUNG
Hochspannungskondesator vor allen
Servicearbeiten gegen Masse entladen.!!
AVANT INTERVENTION TECHNIQUE, DECONNECTER ET
DECHARGER LA CAPACITE DE HAUT VOLTAGE.
B E F O R E   S E R V I C N G   D i s c h a r g e   t h e   h i g h   v o i t a g e
              C a p a c i t o r   b y   s h o r t i n g   t h e   n e g a t i v e   h i g h   v o l t a g e
              T e r m i n a l   o f   i t   t o   c h a s s i s   g r o u n d .
*NOTE:DOOR IS CLOSE.
BN:BROWN  BL:BLUE  YL:YELLOW
RD:RED  WH:WHITE  PK:PINK
G-Y:GREEN AND YELLOWSTRIPED.
F.M:FAN MOTOR
O.L:OVEN LAMP
T.T.M: TURN TABLE MOTOR
C.M:CIRCULATION MOTOR
C.M
RD
 P/NO.3854W3A270A
PRIMARY
SWITCH
BN
RD
RD
NO
MONITOR
SWITCH
COM
7 6 5 4 3 2 1
OVEN
THERMOSTAT
MAGNETRON
THERMOSTAT
BL
BL
N
L
O.L
F.M
T.T.M
YL
YL
WH
BN
WH
RD
10A
NOISE
FILTER
G   -   Y
INPUT
POWER
P O W E R
T R A N S
1
2
3
1 2 3
GN
GN
SECONDARY
SWITCH
PK
WH
WH
MAGNETRON
H.V DIODE
CAPACITOR
H.V
H.V
FUSE
0.8A
RD
RD
RD
F
FA
BL
BL
BL
NC
BN
BL
RD
RD
WH
SOLENOID
YL
BL
WH
RD
RD
RD
TRANSFORMER
RELAY 1
GRILL HEATER
YL
CONVECTION HEATER
RELAY 5
RELAY 2
230VAC
24VAC
COM.
YL
RELAY 4
RELAY 3
YL
WH
YL
RD
THERMISTOR
PCB
ACHTUNG
Hochspannungskondesator vor allen
Servicearbeiten gegen Masse entladen.!!
AVANT INTERVENTION TECHNIQUE, DECONNECTER ET
DECHARGER LA CAPACITE DE HAUT VOLTAGE.
B E F O R E   S E R V I C N G   D i s c h a r g e   t h e   h i g h   v o i t a g e
              C a p a c i t o r   b y   s h o r t i n g   t h e   n e g a t i v e   h i g h   v o l t a g e
              T e r m i n a l   o f   i t   t o   c h a s s i s   g r o u n d .
*NOTE:DOOR IS CLOSE.
BN:BROWN  BL:BLUE  YL:YELLOW
RD:RED  WH:WHITE  PK:PINK
G-Y:GREEN AND YELLOWSTRIPED.
F.M:FAN MOTOR
O.L:OVEN LAMP
T.T.M: TURN TABLE MOTOR
C.M:CIRCULATION MOTOR
C.M
RD
 P/NO.3854W3A269A
R.M
RD
YL
R.M:ROTISSERIE MOTOR
H.V
H.V
MODEL:MC-785DC
MODEL:MC-785BC
MC-784DC
INTRODUCTION 
29
EXPLODED VIEW
DOOR PARTS
 CONTROL PANEL PARTS
LATCH BOARD PARTS
BASE PARTS
INTERIOR PARTS
OVEN CAVITY PARTS
DOOR PARTS
30
13581A
14890A
13720D
13213A
13552A
14026A
14970A
13806F
54974A
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