Sanyo EM-C1900 Manuale utente

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 micro-

wave 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.

ments, 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.

SERVICE MANUAL Microwave Oven EM-C1900 (U.K)

REFERENCE NO. SM-6310022-00

Pro.Code No. Model No.

437 623 00 EM-C1900UK

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.

- 3 -

5.CIRCUIT DIAGRAM

*Caution :The voltage between filament leads of magnetron is about 3.3VA.C, but the filament carries

4KV D.C high voltage with respect to grand. Never touch these lead with bare hand during operation.

Figure 2

㧱㧹㧙㧯㧝㧥㧜㧜

- 7 -

Check each voltage at connector S104 and S105

after removing each connector (female) from

power circuit board.

Pin No.3 (Ground) and 4,5,1,2 at S105.

Pin No.1 and 2 at S104.

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 S104 and S105 from

the power circuit board.

c) Plug the power supply cord.

d) And then, measure each voltage.

COMPONENT

POWER

P.C.B

CONTROL

P.C.B

Measure the voltage: Between test points TP-1, TP-

2 ,TP-3 and ground. (See Figure 12 on page 23)

Note

- Proceed with the check of the control P.C.B to see if

any one of the measured values is different from the

specified values.

CHECKOUT PROCEDURE RESULT

Normal reading:

Connection

Pin No. Voltage

S105

#3 to #4 DC 12V

#3 to #5 DC 16V

#3 to #2 DC 30V

#3 to #1 DC 35V

S104

#1 to #2 AC 2.4V

Test point

TP Voltage

TP-1 DC - 5V

TP-2 DC - 12V

TP-3 DC - 16V

TP-4 DC - 35V

WARNING:

When removing the cabinet, you must disconnect the

power supply cord from the wall outlet for your safety.

Only the checkout procedure below needs the power

supply on. TAKE GREAT CARE to avoid possible shock.

For your safety, proceed with the test only after re-

moving the wire leads from the primary winding of

the high voltage transformer.

Lower

Upper

Primary

winding

Primary

winding

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