Sharp r-3a88 Manual De Usuario

13

RELAY SYMBOL

OPERATIONAL VOLTAGE

CONNECTED COMPONENTS

RY1

APPROX. 25.0V D.C.

Oven lamp / Turntable motor / Cooling fan motor

RY2

APPROX. 25.0V D.C.

Power transformer

CARRY OUT 4R CHECKS.

To protect the electronic circuits, this model is provided with a fine foil pattern added to the primary on
the PWB, this foil pattern acts as a fuse. If the foil pattern is open, follow the troubleshooting guide given
below for repair.

Problem: POWER ON, indicator does not light up.

CARRY OUT 3D CHECKS.

STEPS

OCCURANCE

CAUSE OR CORRECTION

1

The rated AC voltage is not present at

Check supply voltage and oven power cord.

POWER terminal of CPU connector (CN-A).

2

The rated AC voltage is present at primary

Low voltage transformer or secondary circuit defective.

side of low voltage transformer.

Check and repair.

3

Only pattern at "a" is broken.

*Insert jumper wire J1 and solder.

(CARRY OUT 3D CHECKS BEFORE REPAIR)

4

Pattern at "a" and "b" are broken.

*Insert the coil RCILF2003YAZZ between "c" and "d".

(CARRY OUT 3D CHECKS BEFORE REPAIR)

NOTE: *At the time of making these repairs,

make a visual inspection of the varistor.
check for burned damage and examine
the transformer with a tester for the pres-
ence of layer short-circuit (check primary
coil resistance). If any abnormal condi-
tion is detected, replace the defective
parts.

CARRY OUT 4R CHECKS.

36

VRS1

(J1)

(J2)

5

CN-A

1

LOT NO.