Sanyo EM-C1800 User manual

SERVICE MANUAL Microwave Oven EM-Cl 800 (AL
Z.),
Foreword
bRead this manual carefully, especially precaution on microwave energy, and follow the procedure strictly. Careless ser-
vicing and testing may expose yourself to the microwave energy leakage.
PRECAUTIONS
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCES-
SIVE MICROWAVE ENERGY
(a) Do not operate or allow the oven to be operated with door open.
(b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other micro-
wave source, and make repairs as necessary:
(I) Interlock operation, (2) proper door closing, (3) seal and sealing surfaces (arcin9f wear, and other dam-
age), (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 com-
partments, check the magnetron, wave guide or transmission line, and cavitY for ProPer ali9nment, inIe9ritY,
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.

Adjustment Procedures ........................................................ 1Circuit Diagram ...................................................................... 4
Specifications .......................................................................... 2Test Procedures and Troubleshooting ........................ 5-11
PowerOutput Meawrement ................................................ 2Disassembly Instructions ............................................ 12-14
Precautions and Repair Service Tips .................................. 3Exploded View and Parts List .................................... 15-20
.Overall Circuit Diagram ...................................................... 21
,.. ,
CAUTION
MICROWAVE RADIATION
PERSONNEL SHOULD NOT BE EXPOSED TO THE
MICROWAVE ENERGY WHICH MAY RADIATE
FROM THE MAGNETRON OR OTHER MICRO-
WAVE GENERATING DEVICE IF IT IS impro-
perly USED OR CONNECTED. ALL INPUT AND
OUTPUT MICROWAVE CONNECTIONS, WAVE-
GUIDES, FLANGES, AND GASKETS MUST BE
SECURE. NEVER OPERATE THE DEVICE WITH-
OUT AMICROWAVE ENERGY ABSORBING
LOAD AlT’ACHED. NEVER LOOK INTO AN
OPEN WAVEGUIDE OR ANTENNA WHILE THE
DEVICE IS ENERGIZED.
1. ADJUSTMENT PROCEDURES
TO AVOID POSSIBLE EXPOSURE TO MICROWAVE
ENERGY LEAKAGE, THE FOLLOWING ADJUST-
MENT OF THE INTERLOCK SWITCHES SHOULD BE
MADE ONLY BY AUTHORIZED SERVICE PERSON-
NEL.
DOOR INTERLOCK SWITCH, LATCH INTERLOCK
SWITCH, DOOR SENSING SWITCH AND lNTER-
LOCK MONITOR SWITCH ADJUSTMENT
(See Figures 1and 2)
(1)
(2)
(3)
(4)
(5)
Loosen 2screws securing the lever stopper.
Adjust the lever stopper position so that it is
pushed forward and pull backward until the Ac-
tuators are just at the lowest end of their stroke on
the Latch Interlock Switch and Door Interlock
Switch, and at the same time there is about zero
gap between the Latch Lever and the Switch Body
on the Interlock Monitor Switch and Door Sensing
Switch when the Door Latch is securely locked.
Tighten the Lever Stopper screws securely.
Make sure the Interlock Monitor Switch closes
after the Latch Interlock Switch opens when
the door is opened very slowly, according to
“CHECKOUT PROCEDURE FOR SWITCHES”
on page 6.
Make sure the Interlock Monitor Switch opens
before the Latch Interlock Switch closes when the
door is closed very slowly, according to “CHECK-
OUT PROCEDURE FOR SWITCHES” on page 8.
(6) Make sure the microwave energy l~akage IS be!ow
the limit of the regulations (bmV!/crn - ) when
measured with adetector.
(All service adjustments must be t?v.ti~ hr rr,inimum
micro wave energy leakage rcaCJIIIgs.,!
Screw
3Door
%sensing
Switch
Ik
Door
.* interlock
Switch
u●Latch
.PI Interlock
-, ‘Swich
Screti
Figure 1
–l–

Lever Stopper
Door Latch .
.
Latch
Latch
Latch Lever
(Inside)
Interlock
am’ ‘oni’orswich
tSwitch
Latch
Door interlock
>DOOrLatch
=;)] I..ct.ator
k
L
...
.:,
....
*G “
u
Lever
+!$!!$y
nA_Latch
Latch Interlock Switch
Figure 2
2. SPECIFICATIONS
Rated Power Consumption .2800W”
Microwave Output ...... 1700w -170W
Frequency . . . . . . . . . . . . 2,450 MHz 1 50 MHz
Power Supply . . . . . . . . . 231Jv 5OHz
Rated Current . . . . . . . . . 12
Safety Devices . . . . . . . .
Thermal Limitter (Magnetron)
Thermal Limiter (Duct) . . .
Thermistor (Magnetron) . .
Thermistor (Duct) ......
Fuse (Cartridge Type) . . .
Micro Switch, Relay . .
A
150°C OPEN
80°C CLOSE
140”C OPEN
80°C CLOSE
200”C OPEN
108”C CLOSE
120”C OPEN
250V 15A
Latch Interlock Switch
Door Interlock Switch
Safety RELAY
Interlock Monitor Switch
Max input time . . . . . Electronic Digital, up to
MANUAL 10MIN
MEMORY 30 MIN
Overall Dimensions . . . . . 422(W) x540(D) x335(H)
Oven Cavity Size . . . . ;3;(bV) X330(D) x230(H)
mm
Effective Capacity of
Oven Cavity . . 19.1 liters
Net Weight ............. Approx.32Kg
3. POWER OUTPUT MEASUREMENT
(1)
(2)
(3)
(4)
(5)
(6)
(7)
Prepare 1OOO*5g tap water.
Adjust water temperature to 10 °*20C.
Pour water into acontainer made of borosilicate
glass, 190mm outer diameter cylinder, maximum
3mm thickness,
Note: Use the container kept on the room
temperature.
Place the container in the center of oven cavity.
Set the heating time for 27 seconds and rating
full power and then start oven.
Take the container out immediately when heating
time is up.
Stir water for making even water temperature in
(8)
the container.
Measure water temperature.
Water temperature rise shall be 8° to 12”C.
–2–

4. PRECAUTIONS AND REPAIR SERVICE TIPS
PRELIMINARY
A. SINCE NEARLY4,000 VOLTS EXISTS IN SOME CIR-
CUITS OF THIS MICROWAVE OVEN, REPAIRS
SHOULD BE CARRIED OUT WITH GREAT CARE.
B. TO AVOID POSSIBLE EXPOSURE TO MICROWAVE
ENERGy LEAKAGE, THE FOLLOWING PRECAU-
TIONS MUST BE TAKEN BEFORE SERVICJNG.
HINT FOR LAMP-CHANGE
Before removing the cabinet, pull out the mains-plug.
If you want to check the new lamp with the open
cabinet, take care of the following safety-cautions :
Do not touch live parts. The lamp holder is not con-
nected to the earth protection lead by ametric screw.
(1) Before the power is applied.
(a) Open and close door several times to make sure the
latch intelock switch, the door interlock switch
and the interlock monitor switch operation proper-
ly. (Listen for the clicking sound from switches.)
Make sure the interlock monitor switch is closed
after the latch interlock switch is open when the
door is opened. (See pages 1 and 8)
(b) Make sure the Perforated screen and the choke
dielectric 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 aleakage
detector and confirm the energy leakage is below
5mW/cmZ.
(3) Do not operate the unit until it is completely re-
paired, 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 micro-
wave energy leakage.
NOTE: Always keep the seal clean.
(e) Make sure that there are no defective parts in the
interlock mechanism.
(f) Make sure that 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 proper-
ly positioned.
(c) Waveguide 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.
–3–

5. CIRCUIT DIAGRAM
AC230V SC HA LTPLAN FUER DAS MODELL
50Hz CIRCUIT DIAGRAM FOR MODEL
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Power SUEIPIV SCHAKELDIAGRAM VOOR MODEL EM-C1800
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–4–

6. TEST PROCEDURES AND TROUBLESHOOTING
CAUTION
-DISCONNECT THE POWER SUPPLY CORD
FROM THE WALL OUTLET WHENEVERRE-
MOVING THE CABINET FROM THE UNIT. PRO-
CEED WITH THE TESTS ONLY AFTER DIS-
CHARGING THE HIGH VOLTAGE CAPACITOR
AND REMOVING THE LEAD WIRES ON THE
PRIMARY WINDING OF HIGH VOLTAGE TRANS-
FORMER. (SEE FIGURE 4)
A. TEST PROCEDURES
~Secondarv Windinm
Y>L
c)
HIG}I. vC)LTAGE
Figure 4
–5–

‘w
%.-
COMPONENT
HIGH-VOLTAGE
CAPACITOR
including
BLEEDER
RESISTOR
I
[
IGH-VOLTAGE
IODE
FUSE DIODE
TRIAC
(THYRITOR)
CHECKOUT PROCEDURE
Measure the resistance: Across two terminals
with an ohm-meter on highest scale.
Ohm-meter
Figure 8
Measure the resistance: Across two terminals
with an ohm-meter on highest scale.
Ohm-meter m
Q
Figure 9
Measure the resistance: Across two terminals
with an ohm-meter on highest scale.
Figure 10
Measure each resistance: Between the
terminals of the Triac.
Use the x1scale on a ohm meter.
T2
4%
T1 ‘Gate
8
1, Figure 11
RESULT
Normal reading:
Momentarily indicates several ohms, and
gradually returns to 10 meg-ohms.
Abnormal reading:
Indicates continuity or 10 meg-ohms
from the beginning.
Normal reading:
Indicates about the middle position in
one direction (forward direction) and
infinite ohms in the reverse direction,
using meter which is provided with a
9-volt battery.
NOTE
—Some digital meter may show over
even in aforward direction because low
measuring 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.
Normal reading:
Indicates infinite ohms in both directions.
Abnormal reading:
Indicates continuity in both directions or
continuity in one direction and infinite
ohms in reversed direction.
Normal reading;
Gate to TI: About 20 ohms.
Gate to T2: Infinite ohms.
T1 to T2: Infinite ohms.
NOTE
-When the triac is replaced, be sure to
check that each lead wire is securely
connected to the terminals on the triac.
–6–

POWER P.C.B
CONTROL
CIRCUIT BOARD
Check each voltage at connector S13 and S12
after removing each connector (Femail) from
Power circuit board.
Measure the voltage between
Pin No. 3(Ground) and 4, 2, 5, 1at S13.
Pin No. 1and 2at S12.
CAUTION:
Proceed with the test only after removing
the wire leads from the primary winding
of high voltage transformer for your safety.
Test Procedures:
a) Make sure that the power supply cord
is not plugged in.
b) Remove the connector S13 and S12 from
the Power circuit board.
c) Plug the power supply cord.
d) And then, measure each voltage.
Measure the voltage: Between test points TP-1,
TP-2, TP-3, TP-4 and ground (See Figure 14
on page? )
NOTE
—Proceed with the check of the power P.C. B,
to see if any one of the measured values is
different from the specified values.
Normal readings;
IConnector Pin No., IVoltage (V) I
I11
S13, #3& #4 DC –5.1 t0.3
1I
IS13, #3&#2 IDC-12.5 10.5 ]
I1I
IS13, #3&#5 IDC -32.0* 2.0 ]
IS13, #3 &#1 DC+l.5i 0.2
—. --l
IS12. #1 &#2 /AC2.3~0.2 I
S13 S12
Figure 12
Test Point ITP-1 TP-2 I
Voltage –5.1 VDC –12.5V DC
1I
I-32VDC I+1.5VDC I
–7–

CHECKOUT PROCEDURE FOR SWITCHES
+Disconnect the lead wires from the switches and check for the continuity of the switches, connecting an ohm-meter to its ter-
minals.
II
SWITCHES
(SEE Figure 1on page 1) CHECKOUT PROCEDURES
Latch Interlock
Door Interlock Terminals “COM” and “NO”
Door Sensing
IInterlock Monitor ITerminals “COM” and “NC”
I
DOOR OPEN IDOOR CLOSE
1O
-0
+
CAUTION: After checking the switches, make sure that the interlock monitor switch is properly connected according to the
CIRCUIT DIAGRAM on page 3. –8–

CONTROL CIRCUIT BOARD
11+11 I~.[
\/
Figure 14
–9–