Upload
vuongque
View
224
Download
2
Embed Size (px)
Citation preview
SERVICE MANUAL STAINLESS STEEL EM-SL20NECO MICROWAVE OVEN WITH GRILL
FOREWORDRead this manual carefully, especially precaution on microwave energy, and follow the procedurestrictly. Careless servicing and testing may expose yourself to the microwave energy leakage.
FILE No.
PRECAUTIONS
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOIDPOSSIBLE 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 if necessary:(1) Interlock operation, (2) proper door closing, (3) seal and sealing surfaces (arcing, wear, and otherdamage), (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.
(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.
REFERENCE No. SM-2400005
C
150w
450w
Kg/
AUTO
MIN SEC
C
150w 450w
Kg/
AUTO
MIN SEC
Product Code No.
EM-SL20NECO 1-437-574-25
TABLE OF CONTENTSAdjustment Procedures........................................1 Circuit Diagram.................................................... 4Specifications....................................................... 2 Test Procedures and Troubleshooting................. 5-12Power Output Measurement................................ 2 Disassembly Instructions..................................... 13-14Precautions and Repair Service Tips...................2 Exploded View and Parts list................................15-19Oven Control Panel..............................................3 Control Circuit Board............................................20
Overall Circuit Diagrams...................................... 21
1. ADJUSTMENT PROCEDURES
TO AVOID POSSIBLE EXPOSURE TO MICRO-WAVEENERGY LEAKAGE, THE FOLLOWING ADJUST-MENT OF THE INTERLOCK SWITCHES SHOULD BE MADE ONLY BY AUTHORISED SERVICE PERSONNEL
PRIMARY INTERLOCK SWITCH, DOOR SENSING SWITCH AND INTERLOCK MONITOR SWITCH ADJUSTMENT(Figure 1)
(1) Loosen 2 screws securing the lever stopper.(2) Adjust the lever stopper position so that it is pushed
up and pull forward until there is about zero gap.2-1. Between the lever and the switch body on
the door sensing switch.2-2. Between the lever and the switch body
on the interlock monitor switch. 2-3. Between the latch lever and the switch body
on the primary interlock switch.when the door latch is securely locked.
(3) Tighten the lever stopper screws securely.(4) Make sure the interlock monitor is closed after
the primary interlock switch opens when the door is opened very slowly, according to “CHECKOUT PROCEDURE FOR SWITCHES” on page 8.
(5) Make sure the interlock monitor is open before the primary interlock and secondary interlock switches close when the door is closed very slowly, according to “CHECKOUT PROCEDURE FORSWITCHES” on page 8.
(6) Make sure the microwave energy leakage is belowthe limit of the regulation (5mW/cm2) when measured with a detector. ( All service adjustments must be made for minimum energy leakage readings.)
-1-
CAUTIONMICROWAVE ENERGY
PERSONNEL SHOULD NOT BE EXPOSED TOTHE MICROWAVE ENERGY WHICH MAY RADI-ATE FROM THE MAGNETRON OR OTHERMICROWAVE GENERATING DEVICE IF IT ISIMPROPERLY USED OR CONNECTED. ALLINPUT AND OUTPUT MICROWAVE CONNEC-TIONS, WAVE GUIDES, FLANGES, AND GAS-KETS MUST BE SECURE. NEVER OPERATETHE DEVICE WITHOUT A MICROWAVE ENER-GY ABSORBING LOAD ATTACHED. NEVERLOOK INTO AN OPEN WAVE GUIDE ORANTENNA WHILE THE DEVICE IS ENERGISED.
Figure 1
Lever Stopper
Door SensingSwitch
Interlock MonitorSwitch
Primary InterlockSwitch
Screw Positions
Latch Lever
Door Latch
Lever
2. SPECIFICATIONS - EM-SL20NRated Power Consumption........ Micro 1450±10%W
Grill 1100+5/-10%W Dual 2500+5/-10%W(After 15mins.)
Microwave Output...................... 900W( Adjustable 90W through 900W )
Frequency.................................. 2,450MHz ± 50MHzPower Supply............................. 230V,50HzRated Current.............................Micro 6.3±10% Amps
Grill 4.75+5/-10% Amps Dual 10.9+5/-10% Amps (After 15mins.)
Safety Devices........................... Thermal Protector for Magnetron and Cavity, Open at 122˚C Thermal Protector for Heater, Open at 150˚C Fuse (Cartridge Type 8A)Primary Interlock SwitchDoor Sensing SwitchInterlock Monitor Switch
Timer.......................................... Electronic Digital Overall Dimensions.............490(W)x378(D)x322(H)mmOven Cavity Size.................304(W)x304(D)x248(H)mmTurntable Diameter.....................262mmNet Weight..................................Approx. 19.0Kg.
3. POWER OUTPUT MEASUREMENT
(1) Prepare 1000cc tap water in a wide mouthed Pyrex container.
(2) Stir thoroughly and note initial water temperature T1(˚C).
(3) Place container in centre of oven and operate for 60 seconds at full power.
(4) Remove container, stir thoroughly and note final water temperature T2 (˚C).
(5) Calculate power output= 70 x Temp. rise (T2-T1).
NOTE: This is only an approximate test method, notIEC705 test method to which the microwave oven hasbeen tested and rated.
-2-
4.PRECAUTIONS AND REPAIR SERVICE TIPS PRELIMINARY
A.SINCE NEARLY 4,000 VOLTS EXIST IN SOME CIRCUITS OF THIS MICROWAVE OVEN, REPAIRS SHOULD BE CARRIED OUT WITH GREAT CARE
B.TO AVOID POSSIBLE EXPOSURE TO MICROWAVE ENERGY LEAKAGE, THE FOLLOWING PRECAUTIONS MUST BE TAKEN BEFORE SERVICING.
(1)Before the power is applied.(a)Open and close door several times to make sure
the primary interlock switch, the door sensing switch, and the interlock monitor switch operate properly. (Listen for the clicking sound from switches). Make sure the interlock monitor switch is closed after the primary interlock switch is opened, when the door is opened. (See pages 1 and 7).
(b)Make sure the perforated screen and the dielectric choke of the door are correctly mounted.
(2)After the power is applied.(a)Open and close the door to see if the interlock
mechanism operates properly. (b)Check microwave energy leakage with a leakage
detector and confirm the energy leakage is below 5mW/cm2.
(3)Do not operate the unit until it is completely repaired, if any of the following conditions exists.
(a)Door does not close firmly against the cavity front.(b)The hinge is broken.(c)The choke dielectric or the door seal is damaged.(d)The door is bent or warped, or there is any other
visible damage to the oven that may cause microwave energy leakage. NOTE: Always keep the seal clean
(e)Make sure there are no defective parts in the microwave generating and transmission assembly.(especially waveguide).
(4)Following items should be checked after the unit is repaired.
(a)The interlock monitor switch is connected correctly and firmly.
(b)The magnetron gasket on the magnetron is properly positioned.
(c)Wave guide and oven cavity are intact ( no leakage of microwave energy).
(d)The door can be properly closed and the safety switches work properly.
(e)The oven must be stopped when the door is opened or the time is up.
The oven must not be operated with any of the above components removed or bypassed.
C
150w 450w
Kg/
AUTO
MIN SEC
1
5
11
14
KEYS:1. Display Window2. Function and Accessary Indicator3. Kitchen Timer Display4. Auto Program Key5. Auto-Defrost6. Kitchen Timer Key7. More/Less Key
8. Personal Menu Keys9. MIcro Power10. Delay Start11. Quick Start12. Clear/Stop13. Start14. Rotary Dial
-3-
5. OVEN CONTROL PANEL
Figure 1
Notes :A "beep tone" sounds when a "pad" on the control panel is touched, to indicate a setting hasbeen entered. When setting the controls you can keep your finger on a key until the desired setting is reached.
10
13
3
2
4
6
8
7
9
12
SC1 : PRIMARY INTERLOCK SWITCHSC2 : DOOR SENSING SWITCHSC3 : INTERLOCK MONITOR SWITCHMTCO/CFTCO : MAGNETRON/CAVITY FIRE
THERMAL CUT OUTHT : HEATER THERMOSTATRL1 : MAIN RELAYRL2 : POWER CONTROL RELAYRL4 : GRILL HEATER RELAYBM : BLOWER MOTORGM : GEAR MOTORL : CAVITY LAMPST : STEP DOWN TRANSFORMERIR : INRUSH RESISTOR
6.CIRCUIT DIAGRAM
EM-SL20N
MAGNETRON 2M-253H(IF)-N
2x500PF/2x1.5uH
1.14 F
HIGH VOLTAGE RECTIFIER
HIGH VOLTAGE CONDENSER
GM
BM
LNO
COM
HIGH VOLTAGE TRANSFORMER
L1,L2 = 1mHC1 = 0.22 FC2,C3 = 4700PFR = 1M
C1R
C3 C2
L1L2
230V ~50Hz
SC1
MTCO/CFTCO(122ûC)
NCCOM
SC3
RL2
2 1
S101
TOUCH KEYBOARD
CONTROL CIRCUIT BOARD
SC2
COM
NO
RL3
RL4
5
1
3
RL1
ST
S1
HHT(150ûoC)
FUSE (8A T)
H.V. FUSE 0.75A
IR (25 )
OVEN CONDITIONDOOR : OPEN
-4-
- The parts marked with are supplied witha high voltage which exceeds 250V.
- The parts marked with have special char-acteristics important for macrowave leakage.When replacing any of these parts use onlymanufacturer's specified parts.
COMPONENT CHECKOUT PROCEDURE RESULTS1) Check for resistance : Across the filament terminals of the Normal reading :the magnetron with an ohmmeter on Rx1 scale. Less than 1 ohm.
2) Check for resistance : Across the filament terminals of Normal reading :the magnetron and the chassis ground with an ohm-meter Infinite ohmson highest scale.
The chart below shows the firing times of the variable powerrelay for the EM-SL20 model. The table should be used as a means to check the magnetron is operating correctly andproducing any other power setting apart from full power.
7. TEST PROCEDURES AND TROUBLESHOOTINGCAUTION
- DISCONNECT THE POWER SUPPLYCORD FROM THE WALL OUTLETWHENEVER REMOVING THE CABINETFROM THE UNIT. PROCEED WITH THETESTS ONLY AFTER DISCHARGINGTHE HIGH VOLTAGE CAPACITOR ANDREMOVING THE LEAD WIRES FROMTHE PRIMARY WINDING OF THE HIGHVOLTAGE TRANSFORMER. ( SeeFigure 3 )
Figure 4A. TEST PROCEDURE
MAGNETRON
Figure 5
Figure 6
-5-
Filament Windings
Primary Windings
Secondary Winding
Power Level On Time/s % On Time(inc.’ramp up’ time)
High (900W) 30.0 100M-High(750W) 28.0 93Roast (450W) 18.0 60Simmer(300W) 13.0 43Warm (150W) 8.0 27Low (80W) 6.0 20
COMPONENT CHECKOUT PROCEDURE RESULTS
1) Measure the resistance : Normal readings :With an ohmeter on Rx1 scale.a. Primary Winding ; Approximately 1.75 ohms. b. Filament Winding ; Less than 1 ohm. c. Secondary Winding ; Approximately 90.11 ohms.
2) Measure the resistance : Normal readings :With an ohm-meter on highest scale.a. Primary winding to ground ; Infinite ohmsb. Filament winding to ground ; Infinite ohms
Note : Remove varnish ofmeasured point.
1) Measure the resistance : Across two terminals with an Normal reading :ohm-meter on highest scale Momentarily indicates several
ohms, and gradually returnsto 10 Meg-ohm.
Abnormal reading :Indicates continuity or 10MΩfrom the beginning.
Measure the resistance : Across two terminals with an Normal reading :ohm-meter on its highest scale. Indicates over 10MΩ in one
direction (forward direction) and infinite ohms in the reverse direction, using meter which is provided with a 9-volt battery.
NOTESome digital meters may show over even in a forward direction because lowmeasuring voltage of meter does not allow the meter current to pass through the high voltage diode.
Abnormal reading: Indicates continuity or infinite ohms in both directions.
HIGH VOLTAGECAPACITORincludingBLEEDERRESISTOR
Figure 8
HIGHVOLTAGEDIODE
-6-
Figure 9
HIGHVOLTAGETRANSFORMER
Figure 7
COMPONENT CHECKOUT PROCEDURE RESULTS
Measure the resistance : Across two terminals with an ohm-meter on its highest scale.
Normal reading :Indicates continuity.
Abnormal reading :Indicates infinite ohms.
Measure the voltage : Between test points TP-1,TP-2, and ground (See control circuit board on page 20 ).
NOTEProceed with the check of the step down transformer, tosee if any one of the measured values is different from the specified values
Figure 10
-7-
HV FUSE
Test TP-1 TP-2 point Voltage -5V -15V
DC DC
CONTROLCIRCUITBOARDCOMPLETE
SWITCH CHECKOUT PROCEDURES DOOR OPEN DOOR CLOSE
CHECKOUT PROCEDURE FOR SWITCHESDisconnect the lead wires from the switches and check the continuity of the switches, connecting an ohm-meter to itsterminals.
Primary Interlock
Door Sensing
Connect an ohm-meters leads to terminals "COM"and "NO" of switch
Interlock monitorConnect an ohm-meters leads to terminals "COM"and "NC" of switch
CAUTION : After checking the switches, make sure that the interlock monitor switch is properly connected according tothe CIRCUIT DIAGRAM on page 4.
-8-
B. T
RO
UB
LE
SH
OO
TIN
G
ST
EP
SE
QU
EN
CE
RE
SU
LT
(1)
PR
OB
LE
MN
o di
spla
y or
mis
-dis
play
inth
e di
spla
y w
indo
w b
y to
uchi
ngth
e ke
ys.
a Che
ck 2
30V
AC
pow
ersu
pply
of c
onne
ctor
S1
betw
een
Pin
3 an
d P
in 5
afte
r re
mov
ing
conn
ecto
rS
1 fr
om c
ontr
ol c
ircui
tbo
ard.
Che
ck c
ontin
uity
of F
US
E,
The
rmal
Pro
tect
or fo
r ca
vity
,T
herm
al P
rote
ctor
for
mag
netr
on a
nd A
C P
ower
Cor
d.
If th
e fu
se h
as b
low
n se
e"D
. RE
MO
VIN
G F
US
E"
onpa
ge 1
3
0 23
0
0 V
olt
0 23
0
230
Vol
t
PR
OB
LE
M1-
b
Con
trol
C
ircui
t Boa
rd
Che
ck p
ower
sup
ply
volta
geon
con
trol
circ
uit b
oard
.(S
ee p
age
7 )
Vol
tage
inco
rrec
t
Rep
lace
it if
ne
cess
ary
0 V
0 V
Eac
h V
olta
geO
K
Nor
mal
con
trol
circ
uit b
oard
Rep
lace
con
trol
ci
rcui
t boa
rd.
b
Run
s
Run
s
Cor
rect
sea
ting
of
conn
ecto
r S
101
orre
plac
e co
ntro
l circ
uit
boar
d.N
orm
al c
ontr
olci
rcui
t boa
rdR
uns
100
150
450
700
850
Auto
Start
Def.
Time
1000
-9-
EM-S
350
-9-
ST
EP
SE
QU
EN
CE
RE
SU
LT
(2)
PR
OB
LE
MC
ooki
ng o
pera
tion
will
not s
tart
.
a
0 23
0
230
Vol
t
0 23
0
0 V
olt
PR
OB
LE
M3-
b
No
Con
tinui
ty
∞00
∞
Con
tinui
ty O
K
Adj
ust o
r R
epla
ceD
oor
Sen
sing
Sw
itch
CH
EC
K :
1. P
ower
Sup
ply
to O
ven
2. P
rimar
y In
terlo
ck S
witc
h3.
The
rmal
pro
tect
or fo
r C
avity
and
Mag
netr
on
Che
ck c
ontin
uity
of c
onne
ctor
S10
2 be
twee
n pi
ns w
ith th
edo
or c
lose
d af
ter
rem
ovin
gco
nnec
tor
S10
2 fr
om c
ontr
olcc
t boa
rd.
Che
ck c
onta
ctof
con
nect
or S
102
PR
OB
LE
M3a
Cor
rect
Sea
ting
Poo
r C
onta
ctN
orm
al C
onta
ct
Con
tact
OK
Nor
mal
Doo
rS
ensi
ng S
witc
h
Touc
h S
TAR
T k
ey a
nd m
easu
revo
ltage
bet
wee
n th
e tw
o w
irele
ads
from
prim
ary
win
ding
s of
H.V
tran
sfor
mer
aft
er r
emo
vin
gth
e w
ire
lead
s fr
om
ter
min
als
of
H.V
tra
nsf
orm
er
Rep
lace
Con
trol
Circ
uit B
oard
Nor
mal
Con
trol
Cct
. boa
rd
(3)
PR
OB
LE
MO
ven
does
not
hea
t up
a
-10-
Run
s
Run
s
Run
s
-10-
ST
EP
SE
QU
EN
CE
RE
SU
LT
b
Res
ista
nce
OK
Rep
lace
con
trol
ci
rcui
t boa
rd.
(4)
PR
OB
LE
MLo
w m
icro
wav
e po
wer
outp
ut.
a
Nor
mal
con
trol
circ
uit b
oard
Rep
lace
Blo
wer
mot
or
∞0
Res
ista
nce
inco
rrec
t
∞27
4
Nor
mal
Res
ista
nce
Rep
lace
ther
mal
pro
tect
orfo
r m
agne
tron
or
ther
mal
prot
ecto
r fo
r ca
vity
.∞0
∞0
Def
ectiv
e H
.V c
apac
itor,
H.V
dio
de o
r H
.V. f
use.
Rep
lace
HV
ca
paci
tor,
H.V
di
ode
or H
.V.
fuse
.
Rep
lace
HV
Mag
netr
on.
Run
s
Run
s
Run
s
Run
s
Run
s
Run
s
Auto
Start
Def.
Time
Auto
Start
Def.
Time
Auto
Start
Def.
Time
Auto
Start
Def.
Time
Auto
Start
Def.
Time
Auto
Start
Def.
Time
-11-
Nor
mal
Blo
wer
M
otor
Mea
sure
res
ista
nce
of b
low
er m
otor
(App
rox
274
ohm
s)
No
Ope
ratio
n
Nor
mal
ther
mal
pro
tect
or fo
rm
agne
tron
or
ther
mal
prot
ecto
r fo
r ca
vity
.N
orm
alO
pera
tion
Tem
pora
rily
shor
t acr
oss
term
inal
s of
ther
mal
pro
tect
orfo
r m
agne
tron
or th
erm
alpr
otec
tor
for
cavi
ty b
y us
ing
jum
per
lead
.
No
Ope
ratio
n
Nor
mal
Ope
ratio
n
PR
OB
LE
M3-
b
Che
ck o
pera
tion
of b
low
er m
otor
whe
n S
TAR
T k
eyis
touc
hed.
Che
ck r
esis
tanc
e of
each
win
ding
afte
rre
mov
ing
lead
wire
s.(S
ee p
age
6)N
orm
al H
V T
rans
form
er
Che
ck H
.V c
apac
itor
, H.V
. di
ode
or H
.V fu
se w
ith a
n oh
m-m
eter
afte
r re
mov
ing
the
lead
wire
s.(
See
pag
e 7
)
∞0
∞0
Res
ista
nce
Cor
rect
Nor
mal
H.V
cap
acito
r,H
.V d
iode
or
H.V
. fus
e.
Rep
lace
HV
Tran
sfor
mer
Nor
mal
M
agne
tron
Nor
mal
H.V
capa
cito
r ,
diod
e or
fuse
.
Up
Up
Up
Up
UpUp
6
5
-11-
ST
EP
SE
QU
EN
CE
RE
SU
LT
(5)
PR
OB
LE
MT
he m
agne
tron
ope
rate
s on
hi
gh le
vel w
hen
a lo
wer
coo
k po
wer
is s
elec
ted.
a0
230
0 V
olt
0 23
0
230
Vol
t
No
prob
lem
Mea
sure
wat
erte
mpe
ratu
re r
ise
exac
tly.
Rep
lace
con
trol
circ
uit b
oard
.
Nor
mal
con
trol
circ
uit b
oard
Rep
lace
con
trol
ci
rcui
t boa
rd.
(6)
PR
OB
LE
MU
nit d
oes
not h
eat u
p ev
enif
disp
lay
coun
ts d
own
whe
n
k
ey is
touc
hed
for
"G
rill C
ooki
ng".
a
Nor
mal
con
trol
circ
uit b
oard
Rep
lace
Hea
ter
∞52
Nor
mal
Res
ista
nce.
0
∞
Res
ista
nce
Inco
rrec
t.
EM-G
451
Auto
Star
tD
ef.
Dua
lG
rillT
ime
DIR
EC
T
AC
CE
SS EM
-G45
1
Tim
e of
day
Gri
llD
ual
150w
Dua
l45
0w
Chi
lled
Mea
lLi
quid
Jack
etPo
tato
Pizz
a
Pork
Cho
psC
hick
enPi
eces
Aut
oD
efro
st
Dow
nU
p
Tim
er/W
eigh
t
100
150
450
700
850
1000
Pow
erD
elay
Star
t
Star
tC
Cle
ar/S
top
100
150
450
700
850
Auto
Start
Def.
Time
1000
Run
s
Run
s
Che
ck r
esis
tanc
e of
heat
er.
App
roxi
mat
ely
41.7
Ω
mea
sure
d ov
er
both
tube
s.
Set
pow
er le
vel
at lo
w.
Touc
h S
TAR
T k
ey a
nd m
easu
revo
ltage
bet
wee
n le
ads
for
prim
ary
win
ding
of H
.V tr
ansf
orm
er
afte
r re
mov
ing
the
wire
lead
s fr
omte
rmin
als
of H
.V tr
ansf
orm
er.
-12-
Run
sN
orm
al H
eate
r
EM-S
350
Che
ck r
esis
tanc
e of
he
ater
.A
prox
imat
ely
48.7
Ωm
easu
red
over
bot
hte
rmin
als.
C
150w
450w
Kg
/
AU
TO
MIN
SE
C
8.DISASSEMBLY INSTRUCTIONS
- OVEN MUST BE DISCONNECTED FROM ELECTRI-CAL OUTLET WHEN MAKING REPLACEMENTS,REPAIRS, ADJUSTMENTS, AND CONTINUITYCHECKS BEFORE PROCEEDING WITH ANY REPAIRWORK AFTER DISCONNECTING. WAIT AT LEAST 1MINUTE, UNTIL THE CAPACITOR IN THE HIGH VOLT-AGE AREA HAS FULLY DISCHARGED.- WHEN REPLACING ANY DOOR MICRO SWITCH,REPLACE WITH THE SAME TYPE SWITCH SPECI-FIED ON THE PARTS LIST.
A. REMOVING PRIMARY INTERLOCK SWITCH,DOOR SENSING SWITCH AND INTERLOCK
MONITOR SWITCH(See Figure 1 on page 1 and Figure 12 on this page)
(1) Remove 2 screws securing the lever stopper.(2) Disconnect all lead wires from the primary interlock
switch, door sensing switch and the interlock monitor switch
(3) Ease away the retaining clips holding the Primary interlock switch onto the lever stopper and remove.
(4) Remove the door sensing switch by reference to the step (3).
(5) Remove the interlock monitor switch by reference to step (3).
(6) Make the necessary adjustment, and make microwave energy leakage check according to “1. ADJUSTMENT PROCEDURES” on page 1. After the switch is replaced with a new one, check proper operation of it according to “CHECKOUT PROCEDURE FOR SWITCHES” on page 8.
Interlock Switch Replacement - when replacing faultyswitches, be sure switch retaining clips are not bent,broken or otherwise deficient in their ability to securethe switches in place.
B. REMOVING THE ANTENNA(See exploded view on page 15 )(1). Remove the screw securing the cavity cover to the
cavity.(2). Remove the antenna complete by slightly bending it
so the retension clips holding it slide out of the cavity wall.
C. REMOVING MAGNETRON(See exploded view on page 16 )(1) Remove the antenna complete according to
B. REMOVING THE ANTENNA.(2) Disconnect the 2 lead wires from the magnetron.(3) Remove 1 screw securing the duct to the
magnetron, and take out the duct.(7) Remove 4 screws securing the magnetron to
the waveguide.Take out the magnetron VERY CAREFULLY.
NOTES- When removing the magnetron, make sure that its dome does not hit any adjacent parts, or it may be damaged.
- After replacing the magnetron, be sure to check the microwave energy leakage with a leakage detector and confirm the leakage is below 5 mW/cm2 .
D. REMOVING FUSE(A) Remove the 8A fuse with a screwdriver.- When replacing the 8A fuse, be sure to use an exact
repair part.- If the 8A fuse blows immediately, check the primary
interlock switch and the interlock monitor switch (terminals “C” and “NC”) according to “CHECKOUT PROCEDURE FOR SWITCHES” on page 8, and make sure to check the microwave energy leakage according to “1. ADJUSTMENT PROCEDURE” on page 1, when the primary interlock switch or the interlock monitor switch is replaced.
- If the primary interlock switch is defective, replace not only the primary interlock switch but also the interlock monitor switch.
Then install a new 8A fuse.- If the primary interlock switch and the interlock monitor switch (terminals “C” and “NC”) operate properly, determine which of the following is defective: blower motor, turntable motor, high voltage transformer, high voltage capacitor, high voltage diode or magnetron.
- If the high voltage diode is defective , replace notonly the high voltage diode but also the HV fuse.
E. REMOVING DOOR
(1) Remove the 2 screws securing the upper hinge.(2) Tilt the top of the door toward you.(3) Lift up the door to remove it.
When replacing the door body or door assemblythe new door has to be set properly ensuring the correctdoor gap between door body and cavity front.
To set the new door;1. Mount door loosely on cavity.2. Before tigthening the top and bottom hinge screwsplace feeler gauges (the thickness varies for differentmodels- see table below) between the door assembly andthe cavity front plate between the top and bottom hinges.NB. Be careful not to scratch the door cover with the feel-er gauges.3. The door should then be aligned with the control baseand held firmly in place leaving a gap within 1-2mm.between the door cover and control base.
LEVER STOPPER
MICROSWITCH
RETAININGCLIPS
-13-
Figure 12
4. The hinge screws should then be tightened to hold thedoor in place, and the feeler gauges removed.5. The door gap should then be checked again using feelergauges.
Below is a table giving the door setting for the:-EM-SL20N
After setting the door gap, the door is closed with the doorlatch fully engaged and the screws securing the switchbase are loosened. The switch base is then eased to theright to pull the door face hard onto the front of themicrowave. The screws are then secured tight. To check ifthe operation has been carried out correctly push the doortop and bottom. Any movement should be minimal, andthe door should feel tight to the front face of themicrowave.Confirm that the operation has been success-fully carried out by depressing the door release lever untilthe microswitches are heard to operate. This occurs justbefore the door opens.
NOTES- After replacing the door, be sure to check that the
primary interlock switch, door sensing switch and the interlock monitor switch operate normally. (See page 1).
- After replacing the door check for microwave energy leakage with a leakage detector.Microwave energy leakage must be below the limit of 5mW/cm2.
F. DISASSEMBLYING DOOR( See exploded view on page 18 )
(1) Insert a thin flat blade screwdriver between the choke dielectric and the door mainframe and lift up the choke dielectric to release the hooks one by one.
(2) To remove door cover, remove the 2 screws securing the door cover to the door main frame
(3) Insert a thin flat blade screwdriver between the door cover and door mainframe and release the hooks one by one.
(4) To detach the glass door panel, insert a thin flat blade screwdriver between the door panel and door cover and release the clips one by one.
NOTES- The choke dielectric, the glass door panel and the
door cover may be damaged when they are removed. When re-installing them, replace them with new ones if they are damaged.
- After installing the door in place, check for microwave energy leakage with a leakage detector. Microwave energy leakage must be below the limit of 5mW/cm2.
G. CHANGiNG POWER SUPPLY CORD(See exploded view on page 16 )
(1) Removing the earthing screw.(2) Remove the power supply cord from the terminal
of PCB complete.
DOOR GAPLower Limit Upper Limit0.2mm. 0.8mm.
(3) Remove power cord from cavity assembly by lifting cord bush, moving it to the left and pulling itaway from cavity rear plate.
(4) Install the new power supply cord with the reverse procedure of above (1) to (3).
WARNINGFor changing the power supply cord, never use parts other than the following :
Part Name : Power Supply Cord AssemblyPart No : 617 213 2990 (Continental)
H. REMOVING TURNTABLE MOTOR COVER(Refer to Figures 13 and 14 below )
(1) Turn the unit and cut the 6 joints of the bottom plate and the motor cover using diagonal pliers (nipper). (See Figure 13 )
(2) Seperate the motor cover and the bottom plate.
NOTES- Bend the cut joints inside slightly for safety and be careful of the sharp edges.
RE-INSTALL :(1) Rotate the motor cover through 180˚.(2) Insert the edge of the motor cover into the tab on
the bottom plate.(3) Secure the motor cover by screwing it to the
bottom plate (See Figure 14 )Use screw 411 156 5502 (not supplied with oven)
Clip metal hereand at other 5 locations.
Retaining Lugs
Metal Tabs
Insert screw here tosecure.
Tabs fit intoretaining lugs.
Figure14
Figure13
-14-
-15-
1
2
2
3
2
4
5
10
12
11
9
8
7
6
13
15
16
2
8. EXPLODED VIEW AND PARTS LISTCAVITY PARTS
Key Part No. Description Q'tyNo.
13 617 221 0025 Heater Complete 114 617 202 4554 Thermostat, 150˚C 115 617 167 0431 Duct 116 617 169 6875 Frame Rear Plate 117 617 166 2153 Cook Net (H) 118 617 170 5058 Cook Net (L) 119 411 010 5600 SCR EVR PAN 3x6 1
Key Part No. Description Q'tyNo.
1 617 220 4376 Cabinet 12 411 156 5601 SCR TPG PAN+F+S 4x10 73 MO-A0730 Cavity 14 MO-S1121 Gear Motor 15 411 001 6005 SCR S-TPG PAN 4x8 26 MO-R0132 Special Washer 17 617 184 7659 Turntable Shaft 18 617 215 9560 Roller Base Ass'y 19 617 167 1421 Glass Tray 110 MO-A0737 Antenna Complete 111 617 169 8930 Cavity Cover 112 412 037 5901 SCR TPG TRS 4x6K 1
EM-SL20N
2
18
17
14
19
-16-
1
18
24
5
3
3
3
2
6a
7
8
9
10
1112
1314
15
16
17
20
21
193
22
3
25
26
27
4
28
3
SWITCHES AND MICROWAVE PARTS
Key Part No. Description Q'tyNo.
1 411 010 5600 SCR EVR PAN 3x6 12 411 156 5601 SCR TPG PAN+F+S 4x10 13 411 156 5502 SCR S-TPG PAN+F+S 4x10 64 411 171 9004 SCR TPG TRS+FLG 3x8 15 617 213 2990 Power Supply Cord 16a 617 179 0746 PCB Complete (N-F) 16b 423 027 8802 Fuse 17 617 167 0417 Space Partition 18 617 162 2041 Capacitor Band 19 MO-S0856 Capacitor 1.14uF 110 MO-S0947AS Diode Ass'y 111 617 234 1934 Lead Wire Ass'y 112 617 182 2915 HV Fuse 113 617 229 3769 Blower Motor 114 MO-S1118 Magnetron 115 617 112 1025 Fan 116 MO-M1211 Duct 1
EM-SL20NKey Part No. Description Q'tyNo.
17 617 195 3428 Latch Lever 118 617 189 0839 Lever Stopper 119 617 244 0651 Door Sensing Switch 120 617 244 0644 Interlock Monitor Switch 121 617 244 0651 Primary Interlock Switch 122 MO-S0587 Lamp Ass'y 124 617 202 4561 Thermostat V122˚C 125 617 220 1757 Stay Plate 126 617 218 9673 Special Screw 427 411 004 5609 NUT HEX M4 128 402 071 0703 Ceramic Resistor 1
MICROWAVE PARTS
Key Part No. Description Q'tyNo.
1 617 209 4557 Transformer 12 617 225 1721 Special Screw 23 617 225 6153 Bottom Plate Assembly 14 ------------------ Gear Motor Cover 1 5 617 144 5435 Foot Cushion Assembly 46 617 166 7493 Bottom Hinge 17 411 156 5602 SCR S-TPG PAN+F+S 4x10 18 617 102 7495 Special Screw 2
-17-
1
3
4
5
8
6
7
EM-SL20N
2
2
DOOR PARTS
Key Part No. Description Q'tyNo.
1 MO-A0748 Door Cover Assembly 12 MO-A0768 Door Main Frame(Supplied 1
with inner Door Panel)* 617 144 2472 Glass Inner Door Panel 1 3 617 167 0189 Hinge 14 617 167 1292 Choke Dielectric 15 617 195 3411 Door Latch 16 617 101 1494 Spring 1
* MO-A0756 Door Assembly 1
-18-
3
2
4
6
5
EM-SL20N
Inner Door Panel always supplied with Door Main Framebut can be ordered seperatelyquoting number below.
NB. Please refer to the detailed instructions for doorsetting on page 14 of the service manual beforechanging, adjusting or repairing these parts.
1
Key Part No. Description Q'tyNo.
1 MO-A0749 Control Base Assembly 12 617 236 6463 Knob Body 13 617 219 5520 PCB Complete 14 617 224 0275 PCB Complete 16 617 197 4836 PCB Complete 1 7 617 181 7980 Latch Lever 18 MO-A0747 Handle Assembly 19 617 188 3329 Spring 110 617 224 1067 Knob Assembly 111 411 064 6608 SCR TPG BIN 3x8 1112 617 231 3047 Special Nut (Metal) 1
* MO-P5257 Operating Instructions (EES) 1* MO-P5276 Carton Box 1
-19-
9
1
2
8
* These items not illustrated
CONTROL PANEL PARTS
EM-SL20N
311
4
7
610
12
11
13
10.CONTROL CIRCUIT BOARDEM-SL20N
Model Spares No. RL3 M.ProcessorEM-SL20N 617 224 0275 Yes IC11 LM8842
-24-
11. OVERALL CIRCUIT DIAGRAMEM-SL20N
-21-
IC 11 LM8842
P65
/AN
5P
64/A
N4
P61
/AN
1
C10
30.
01u
50V
R12
010
K
D11
1
51
3
V5T1
RL1
12
Q10
7D
TA14
3X
-15V
4.7K
10K
DO
OR
SE
NS
ING
SW
ITC
H
S1
3/5P
5306
2-03
10
PT
1 P
D5T
K-S
150
-5V
93 40
R11
5 3.
3K
R11
61K
BZ
12K
HZ
R11
910
K
C10
60.
01u
50V
19
XIN
XO
UT
P50
P47
P54
P56
/TO
UT
AV
SS
VS
S
P63
/AN
3
P62
/AN
2
D11
1N40
02 X
4
C12
47u
/10V
-5V
-15V
D15
1N40
02
C13
470u
/35V
ZD
11R
D5.
6ES
B3
R11
4.7K
C15
1000
P/5
0V
C16
0.01
u/5
0V
D12
C14
0.01
u/5
0V
D13
D14
Q11
A56
4A
R12
2.7
K
C11
470u
/35V
R1
3 R1
4
ZD
13
ZD
12
Q12
B12
3B
RD
7.5E
SB
3 X
2
C10
70.
1u/2
5V
OP
EN
R12
110
KR
122
100K
R12
310
0KR
124
100K
-5V
98 99 2
VL3
VL2
VL1
R11
710
K
-5V
Q10
8 A
564A
R11
810
K
OP
EN
OP
EN
OP
EN
15 16 17
OP
EN
23 25 26
OP
EN
D10
31N
4002
OP
EN
18
OP
EN
OP
EN
OP
EN
-5V
R10
5 4.
7K
5 6 9
P57
11 10P
60/A
N0
P43
P41
P40
P53
P52
P51
P42
/INTO
P55
/CN
TR
1V
CC
VR
EF
13 91 9224
2 1D
102
S10
252
67-0
3A
R10
410
K
C10
20.
01u
/50V
R14
0 4.
7K
1 2 3
S30
1 E
H3P
R30
410
KC
302
1000
P/5
0V
R30
310
K
R30
1 10
K
R30
2 10
K
-5V
C30
110
00P
/50V
97-9
490
-68
67-5
855 54 53 52 51 50 49 48 47 46
1
-4 5
-27
39-2
8
CO
M1-
4 LCD1 H4062
C
OM
0-3
S
EG
0-22
SE
G23
-34
P11
/SE
G35
P12
/SE
G36
P13
/SE
G37
P14
/SE
G38
P15
/SE
G39
P16
P17
P20
P21
P22
Q10
1D
TA12
3X2.
2K
10K
-5V
3938R
S1
4MH
Z
R10
356
0K
D10
1C
101
1µ /50V
R10
210
K
ZD
101
RD
3.9
ES
B2
R10
11K
RS
T35
RL2
OP
EN
7 8
TIM
ER
SW
SW
BO
AR
D(1
2700
)
OP
EN
OP
EN
OP
EN
OP
EN
OP
EN
LED
1 L
ED
2 L
ED
3 L
ED
4 L
ED
5
R15
210
KR
151
390Ω
R15
31.
2KQ
151
A56
4A
27P
77
-15V
3 4 34
-5V
P67
/AN
7
P66
/AN
6
P70
R52
12K
R54
12K
R56
12K
37 36P
80P
81O
PE
NO
PE
N
-5V
4 23 12
OP
EN
OP
EN
C1
C2
1 100
OP
EN
OP
EN
33 32 31 30 29 28
OP
EN
OP
EN
OP
EN
OP
EN
OP
EN
OP
EN
P71
P72
P73
P74
P74
P75
P76P23
P24
P24
P26
P27
45 44 43 42 41
R12
9 10
K
R12
810K
R12
710K
R12
6 10
K
R12
5 10
K
R10
110
0K x
5
R13
0R
131
R13
24.
7K X
5
53
14
2
1214
1613
15
7 9 11 13 156 8 10 12 14 16
10 8 6 4 211 9 7 5 3 1
SW
2
SW
9-2
SW
10
SW
11S
W6
SW
5
SW
4
SW
3
SW
13
SW
12S
W8
SW
9-1
SW
14
DE
LAY
STA
RT
A.D
EF
MIC
RO
PO
WE
R
QU
ICK
STA
RT
GR
ILL
KIT
CH
EN
TIM
ER
MO
RE
/LE
SS
CLE
AR
/S
TOP
STA
RT
AU
TO
GR
ILL
450W
GR
ILL
150W
S10
152
045-
1645
S10
352
044-
1645
SW
BO
AR
D(3
1900
)
MA
GN
ET
RO
N
2x50
0PF
/2x1
.5uH
HIG
H V
OLT
AG
E R
EC
TIF
IER
HIG
H V
OLT
AG
E C
ON
DE
NS
ER
GM
BM
CL
HIG
H V
OLT
AG
E T
RA
NS
FO
RM
ER
MQ
/OV
EN
TH
ER
MO
PR
IMA
RY
SW
ITC
H
230V
50H
z
C1 R C3
C2
L1,L
2 =
1m
HC
1 =
0.2
2µF
C2,
C3
= 4
700P
FR
= 1
MΩ
L1
L2
MO
NIT
OR
SW
ITC
H
HE
ATE
RT
HE
RM
O
GR
ILL
HE
AT
ER
FU
SE
8A(T
)
RL4
CA
PAC
ITO
R
2.2K
10K
Q10
2D
TA12
3Y D10
7D
104
R10
6 R
107
18Ω
x 2
MQ
RL2
RL3
INR
US
HR
ES
ISTO
RQ
105
C17
41R
114
150Ω
4.7K
10K
Q10
6D
TA14
3X
R11
24.
7KR
113
47K
14
CL
RL1
D11
0
OP
EN
OP
EN
2.2K
10K
Q10
4D
TA12
3Y
D10
9D
106
R11
0 R
111
18Ω
x 2
GR
ILL
HE
ATE
R
2.2K
10K
Q10
3D
TA12
3Y D10
8D
105
R10
8 R
109
18Ω
x 2
INR
US
H222120
P46
P45
P44
2002-09
Please NoteAll the information that appears in this service manual was correct at the time of production. SANYO Electric Companyreserves the right to make changes to parts or processes in order to maintain their policy of continuing improvement.