Sanyo EM-X471S, EM-X471YS, EM-X471SS, EM-X471US, EM-X471BS Service Manual Supplement

SUPPLEMENT OF Microwave Oven EM-X471S

SERVICE MANUAL EM-X471YS

EM-X471US
EM-X471SS
EM-X471BS (Australia / New Zealand)

Model No : Product Code No :

EM-X471S 437 450 47

EM-X471YS 437 450 48

EM-X471US 437 450 49

EM-X471SS 437 450 50

EM-X471BS 437 450 54

File No :

See the Service Manual of EM-X670S (SM-860177)

Foreword

Read this manual carefully, especially precaution on microwave energy, and follow the procedure strictly.
Careless servicing and testing may expose yourself to the microwave energy leakage.

except the items described in this Service Manual.

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.

(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. SS-860264

- TABLE OF CONTENTS -

Specifications ....................................................... 1

Power Output Measurement .................................. 1

Circuit Diagram .................................................... 2

1. SPECIFICATIONS

Rated Power Consumption .. 1500W.

Microwave Output .............. 1000W.

Frequency .......................... 2,450MHz±50MHz.

Power Supply ..................... 230 ~ 240V, 50Hz.

Rated Current ..................... 6.6 Amp.

Safety Devices ................... Temp. Fuse open at

Timer ................................ Electronic Digital, up to

Overall Dimensions ............. 525(W) x 425(D) x 289(H)mm.

Oven Cavity Size ................ 351(W) x 371(D) x 208(H)mm.

Turn Table Diameter ............ 275mm

Effective Capacity of

Oven Cavity ....................... 28 litres.

Net Weight ........................ Approx. 17 Kg.

o

C for Cavity.

167
Thermal Protector open at

o

122

C for Magnetron,
Fuse (Cartridge Type 8A),
Primary Interlock Switch,
Door Sensing Switch and
Relay 2.
Interlock Monitor Switch.

99 min. 99 sec.

Test Procedures ............................................ 3 ~ 4

Exploded View and Parts List ......................... 5 ~ 10

Overall Circuit Diagram .................................. 11

(3) (a) Set cooking time to two (2) minutes. (“2 00”

appears in display)

(b) Touch “START” key and operate oven for exactly

two (2) minutes.

(4) (a) Take out the two bowls at once.

(b) Stir both water with thermometer and measure the

water temperature rise respectively.

(5) (a) Get temperature rise by calculation the difference

(water temperature after cooking minus initial
temperature) in each bowl.

(b) Then calculate average value(t) of both temperature

rise in degrees centigrade.

(c) Then work out :

Power Output (watt) = 70 x ∆t

2. POWER OUTPUT MEASUREMENT

NOTE

The Power Output specification 1000W on this model
is measured with IEC measurement. The Power Output
is measured with two (2) litres water is equivalent to
1000W in measurement with IEC, when measured with
the following Power Output.

(1) (a) Fill two test bowls with each 1 litre water respectively.

(b) Use accurate thermometer and measure each

water temperature respectively.

(2) Place the two bowls on glass turntable.

Where ∆t is an Average Temperature Rise in degrees

centigrade.

(6) Power Output shall be in the following range :

Average Microwave
Temperature Rise Power Output

Minimum

11.2oC 784W

Maximum

13.7oC 959W

(7) Power Output will be influenced by line voltage of

power supply. Consequently, correct Power Output
must be measured within 240V AC ± 2 Volts while
unit is operating.

- 1 -

3. CIRCUIT DIAGRAM

Figure 1

NOTE : THE SIGN Parts marked with this sign are supplied

THE SIGN Parts marked with this sign have special

with High Voltage exceeding 250V.

characteristics important for microwave
leakage. When replacing any of these
parts use only manufacturer’s specified
parts.

- 2 -

WIRING COLOUR

BK : BLACK
BL : BLUE
W : WHITE
O : ORANGE
Y : YELLOW
R : RED

4. TEST PROCEDURES

CAUTION

- DISCONNECT THE POWER SUPPLY CORD FROM
THE WALL OUTLET WHENEVER REMOVING THE
CABINET FROM THE UNIT. PROCEED WITH THE
TESTS ONLY AFTER DISCHARGING THE HIGH
VOLTAGE CAPACITOR AND REMOVING THE LEAD
WIRES FROM THE PRIMARY WINDING OF THE
HIGH VOLTAGE TRANSFORMER. (SEE FIGURE 2)

A. TEST PROCEDURES

COMPONENT CHECKOUT PROCEDURE RESULT

1) Check for resistance : Across the filament Normal reading :
terminals of the Magnetron with an Less than 1 Ohm.
Ohm-Meter on R x 1 scale.

Ohm-Meter

MAGNETRON

Secondary

Windings

Figure 3

Filament Windings

Primary

Windings

Figure 2

HIGH-VOLTAGE
TRANSFORMER

2) Check for resistance : Between each filament Normal reading :
terminal of the Magnetron and the chassis Infinite Ohms.
ground with an Ohm-Meter on highest scale.

Ohm-Meter

Figure 4

1) Measure the resistance : Normal readings :
With an Ohm-Meter on R x 1 scale.
a. Primary winding : Approximately 1.53 Ohms.
b. Filament winding : Less than 1 Ohm.
c. Secondary winding : Approximately 97.2 Ohms.

2) Measure the resistance : Normal readings :
With an Ohm-Meter on highest scale.
a. Primary winding to ground : Infinite Ohms.
b. Filament winding to ground : Infinite Ohms.

Ohm-Meter

Note : Remove varnish of

measured point.

Figure 5

- 3 -

COMPONENT CHECKOUT PROCEDURE RESULT

TOUCH KEY
BOARD

0

QUICK
REHEAT
30 SEC.

1

2

3

Measure the resistance between terminals of
FPC connector after removing it from S101.
(Figure 6).

- When reconnecting the FPC connector, make When checking “START” key, connect
sure the holes on the connector are properly Ohm-Meter as illustration below.
inserted in hooks of the plastic fastener in S101.

MATRIX CIRCUIT FOR

NOTE

Resistance
value

When When not
touched touched

Less than More than
1K Ohms 1 MEG Ohms

TOUCH KEY BOARD
FPC CONNECTOR

6

7

8

9

5

FINE

DEFROST

CUSTOM

PROGRAMS

FISH

FILLET

POWER

LEVEL

QUICK

REHEAT

QUICK

DEFROST

START

SOUP

BEVERAGE

POTATO

RICE

FROZEN

VEGETABLE

MORE +

L ESS --

MENU

MATCH

KITCHEN

TIMER

FRESH

VEGETABLE

Ohm-Meter

4

CONTROL
CIRCUIT
BOARD

STOP /
CLEAR

OPTIONS

Measure the voltage : Between test points TP-1,
TP-2, TP-3 or TP-4 and Ground between TP-5
and TP-6. (See Control Circuit Board on page 9).
.

- Proceed with the check of the Step-Down
Transformer, to see if any one of the measured
values is different from the specified values.

CLOCK

NOTE

MEAT

ADD

30 SEC

TERMINALS OF FPC CONNECTOR

Figure 6

Test
Point

TP-1

TP-2

TP-3

TP-4

TP-5/ 2.0V
TP-6 AC

Voltage

-5V
DC

-22V

DC

-25V

DC

-37V
DC

- 4 -

5. EXPLODED VIEW AND PARTS LIST

CAVITY PARTS

*** ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN USING

APPROVED TESTING EQUIPMENT. CUSTOMERS SHOULD NOT ATTEMPT TO REPLACE PARTS
IDENTIFIED BY A TRIPLE ASTERISK (***).

Key

Part No. Description Q’ty

No.

1 617 214 9172 Cabinet EM-X471S 1
1 617 224 2262 Cabinet EM-X471YS 1
1 617 224 2125 Cabinet EM-X471US 1
1 617 224 4082 Cabinet EM-X471SS 1
1 617 214 9998 Cabinet EM-X471BS 1
2 411 082 5201 SCR TPG TRS 4 x 10 Z1 8
3 411 160 6007 SCR TPG TRS + SRT 4 x 10 Z1 4
4 617 225 0724 Power Cord 1
5
6 617 204 9366 Oven Cavity*** (Not Service Part) 1
7 617 151 2458 Gear Motor 1
8 411 010 5808 SCR EVR PAN 4 x 10 Z1 2
9 617 138 5601 Bottom Plate*** (Not Service Part) 1
10 617 221 6089 Plastic Foot with Canoe Clip 4

NOTE : Also order Circuit Diagram when replacing Cabinet

Key

Part No. Description Q’ty

No.

11 411 011 0802 Bolt Hex+SW+W 5 x 14 Z1*** 2

12 617 180 6137 Hinge, Lower*** 1
13 411 089 2500 Washer F5 x 10 x 0.8 1
14 617 120 8481 Insulation Sheet 1
15 617 144 4476 Turn Table Shaft 1
16 617 204 9489 Roller Base Assy 1
17 617 073 5889 Rotating Tray 1
18 617 222 2912 Antenna Complete 1
19 617 162 1938 Cavity Cover 1
20 411 069 1707 SCR TPG TRS 4 x 6 DA 1
21 411 006 6604 SCR TPG PAN 3 x 6 Z1 2
22 617 200 0381 Thermal Fuse 167oC1
23 617 080 5315 Special Washer 1
24 411 160 6106 SCR S-T TRS + SRT 4 x 10 Z1 2

- 5 -

SWITCHES AND MICROWAVE PARTS

Parts marked with this sign are supplied with
High Voltage exceeding 250V.

Parts marked with this sign have special characteristics
important for microwave leakage. When replacing any of
these parts use only manufacturer’s specified parts.

*** ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN USING

APPROVED TESTING EQUIPMENT. CUSTOMERS SHOULD NOT ATTEMPT TO REPLACE PARTS
IDENTIFIED BY A TRIPLE ASTERISK (***).

Key

Part No. Description Q’ty

No.

1 411 082 5201 SCR TPG TRS 4 x 10 Z1 8
2 617 208 0260 H.V. Transformer,*** YS-X670SAP 1
3 617 199 8283 Stay, Cavity & Magnetron 1
4 411 006 6604 SCR TPG PAN 3 x 6 Z1 1
5 617 124 1235 Thermostat, Magnetron 122oC1
6 415 002 6101 Magnetron,***2M219H(B)A- 1
7 423 022 7503 Fuse, 250V 8A 1
8 617 213 3416 Power PCB 1
9 617 225 8553 Lead Wire Ass’y, with Diode 1
10 617 162 1990 Space Partition (Blower) 1
11 617 212 9013 H.V. Capacitor including Resistor, 1

12 617 182 2373 Capacitor Band 1
13 411 011 5609 Bolt Hex 4 x 10 Z1 4
14 617 198 4996 Duct, Magnetron Exhaust 1
15 617 110 3618 Lamp, 240V 25W 1
16 617 124 1280 Lamp Socket 1
17 617 167 0592 Blower Motor 1

1.10µf 2.5KV

Key

Part No. Description Q’ty

No.

18 411 082 5201 SCR TPG TRS 4 x 10 Z1 2
19 617 196 8507 Blower Fan 1
20 617 124 1181 Latch Lever*** 1
21 617 221 4078 Micro Switch,*** Primary Interlock 1

22 617 221 4061 Micro Switch,*** Interlock Monitor 1

23 617 221 4078 Micro Switch,*** Door Sensing 1

24
25 617 124 1174 Lever Stopper*** 1
26 411 102 5907 SCR ETG TRS 4 x 10 N2 2
27
28 617 117 3505 Harness, (Door Sensing) 1
29 617 124 3796 Lead Wire Ass’y 1
30
31 411 001 4704 SCR S-T PAN 4 x 10 Z1 1
32
33 411 160 6106 SCR S-T TRS + SRT 4 x 10 Z1 1

AM51630C53F2

AM50620C53

AM51630C53F2

- 6 -

DOOR PARTS

*** ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN USING

APPROVED TESTING EQUIPMENT. CUSTOMERS SHOULD NOT ATTEMPT TO REPLACE PARTS
IDENTIFIED BY A TRIPLE ASTERISK (***).

Key

Part No. Description Q’ty

No.

1 617 207 6294 Door Cover*** EM-X471S 1
1 617 224 2286 Door Cover*** EM-X471YS 1
1 617 224 2149 Door Cover*** EM-X471US 1
1 617 224 4105 Door Cover*** EM-X471SS 1
1 617 210 7271 Door Cover*** EM-X471BS 1
2 617 210 7592 Door Panel*** 1
3 617 205 7163 Door Main Frame*** (Also order 1

Door Sheet when replacing
Door Main Frame)

Key

Part No

No.

4 617 124 0948 Choke Dielectric*** 1
5 617 124 0931 Door Sheet 1
6 411 054 1903 Nut Hex + Flg W / SRT 5*** 2
7 617 180 6151 Hinge, Upper*** 1
8 411 011 0802 Bolt Hex+SW+W 5 x 14 Z1*** 2
9 617 101 1494 Spring*** 1
10 617 179 2478 Door Latch*** 1

. Description Q’ty

- 7 -

CONTROL PANEL PARTS

*** ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED TECHNICIAN USING

APPROVED TESTING EQUIPMENT. CUSTOMERS SHOULD NOT ATTEMPT TO REPLACE PARTS
IDENTIFIED BY A TRIPLE ASTERISK (***).

Key

Part No. Description Q’ty

No.

1 617 225 6054 Control Sheet*** EM-X471S 1
1 617 225 8423 Control Sheet*** EM-X471YS 1
1 617 225 8430 Control Sheet*** EM-X471US 1
1 617 225 8447 Control Sheet*** EM-X471SS 1
1 617 225 9963 Control Sheet*** EM-X471BS 1
2 617 224 8189 Touch Key Board*** 1
3 617 207 6317 Control Frame*** EM-X471S 1
3 617 224 2323 Control Frame*** EM-X471YS 1
3 617 224 2194 Control Frame*** EM-X471US 1
3 617 224 4143 Control Frame*** EM-X471SS 1
3 617 210 7301 Control Frame*** EM-X471BS 1

NOTE : Also order Touch Key Board when replacing Control Sheet and vise versa

Key

Part No. Description Q’ty

No.

4 617 207 0377 Control Base*** 1
5 411 160 6205 SCR TPG TRS+SRT 4 x 10 Z1 1
6 617 222 7016 Power & Control Circuit Board*** 1
7 411 129 5805 SCR TPG BIN 3 x 10 Z1 2
8 617 080 9559 Spring, Door Release Lever*** 1
9 617 207 0353 Door Release Lever*** EM-X471S 1
9 617 224 2316 Door Release Lever*** EM-X471YS 1
9 617 224 2187 Door Release Lever*** EM-X471US 1
9 617 224 4136 Door Release Lever*** EM-X471SS 1
9 617 210 7288 Door Release Lever*** EM-X471BS 1

PRINTED MATTER (Items Not Illustrated)

Key

Part No. Description Q’ty

No.

617 198 7324 Cook Book 1
617 224 8219 Operating Instructions 1
617 212 9006 Circuit Diagram 1
617 224 8202 Carton Box Comp. EM-X471S 1
617 225 1943 Carton Box Comp. EM-X471YS 1
617 225 1998 Carton Box Comp. EM-X471US 1
617 225 2049 Carton Box Comp. EM-X471SS 1

Key

Part No. Description Q’ty

No.

617 225 9956 Carton Box Comp. EM-X471BS 1
617 224 8158 Name Plate EM-X471S 1
617 225 1899 Name Plate EM-X471YS 1
617 225 1950 Name Plate EM-X471US 1
617 225 2001 Name Plate EM-X471SS 1
617 225 9871 Name Plate EM-X471BS 1

- 8 -

CONTROL CIRCUIT BOARD
(Part No. 617 222 7016)

35500

- 9 -

CONTROL CIRCUIT BOARD

(Part No. 617 222 7016)

Key No. Order Part No. Description Q’ty

INTEGRATED CIRCUIT

IC11 409 461 3603 IC LM8861-525SP. 1

TRANSISTORS

Q11, 12 405 004 3000 2SA564A-Q-TP. 2

Q101 405 082 4609 DTA123YS-TP. 1

Q102, 105, 405 000 1802 DTA143XS-TP. 3
107

Q104 405 035 4809 2SC1685-Q-TP. 1

Q106 405 000 3103 DTC114ES-TP. 1

Q103 405 000 5602 DTC143XS-TP. 1

DIODES

D11, 12 407 012 0200 1N4002-TP. 2

D101~107 407 012 4406 1SS133-TP. 7

ZD14 407 051 4405 GZS13Y-AT1. 1

ZD11 407 057 0500 RD5.6ESB3. 1

ZD12 407 160 6703 RD27ESB1. 1

ZD13, 101 407 132 2306 HZS3.9NB2. 2

CAPACITORS

C102 403 002 4708 Ceramic, 0.1mfd, 1

±5%, 25V.

C103, 104 403 069 8305 Ceramic, 0.01mfd, 2

±5%, 50V.

C101 403 147 8807 Electrolytic, 1mfd, 1

±20%, 50V.

C11 403 152 7307 Electrolytic, 100mfd, 1

±20%, 35V.

C13 403 147 8609 Electrolytic, 47mfd, 1

±20%, 10V.

C12 403 160 8709 Electrolytic, 470mfd, 1

±20%, 25V.

Key No. Order Part No. Description Q’ty

RESISTORS.

R101, 107, 401 012 5609 Carbon, 1K Ohms 8
114, ±5%, 1/4W.
123 ~ 127

R15, 102, 401 012 6903 Carbon, 10K Ohms 5
108, 109, 116 ±5%, 1/4W.

R128, 130, 401 012 8006 Carbon, 100K Ohms 3
131 +-5%, 1/4W.

R16, 52, 401 013 6308 Carbon, 12K Ohms 4
55,58 ±5%, 1/4W.

R13, 14 401 016 2505 Carbon, 220 Ohms 2

R105 401 016 3700 Carbon, 2.2K Ohms 1

R104, 106 401 016 4707 Carbon, 22K Ohms 2

R111, 112 401 016 9603 Carbon, 27 Ohms 2

R115 401 017 1705 Carbon, 2.7K Ohms 1

R110 401 018 2701 Carbon, 330 Ohms 1

R113 401 018 3708 Carbon, 3.3K Ohms 1

R11, 401 020 1907 Carbon, 4.7K Ohms 7
117 ~ 122 ±5%, 1/4W.

R53, 103 401 020 2805 Carbon, 47K Ohms 2

R1 2 401 021 2903 Carbon, 5.6K Ohms 1

MISCELLANEOUS

BZ1 420 000 6800 Buzzer,

VST1 407 118 5505 Varistor

DT 1 617 220 9784 Display Tube. 1

RL1 617 137 9358 Relay, OJE-SH-112LM. 1

RL2 617 141 0549 Relay,

RS 1 617 128 3372 Ceramic Oscillator. 1

S1 617 169 4109 Connector. 1

S101 617 126 8959 Connector 11P. 1

S201 617 002 4396 Connector, 3P, Male. 1

S102 617 111 1392 Connector, 2/3P Male. 1

PT1 617 171 2155 Step-Down Trans. 1

2 617 079 4107 Spacer. 1

J1 ~ 6 617 079 4299 Jumper. 6

J101~108 617 079 4237 Jumper. 8

±5%, 1/4W.

±5%, 1/4W.

±5%, 1/4W.

±5%, 1/4W.

±5%, 1/4W.

±5%, 1/4W.

±5%, 1/4W.

±5%, 1/4W.

±5%, 1/4W.

PKM22EPT-2001. 1

ENC 471D-10A. 1

DEC DU12D1-1PR. 1

PD5TK-S150.

- 10 -

6. OVERALL CIRCUIT DIAGRAM

July ‘99/300 LT. Printed in Singapore

- 11 -

SANYO Electric Co., Ltd.
Osaka, Japan.