Sharp R-21JCA-F service manual Steps Occurrence Cause or Correction

R-21JCA-F

TEST PROCEDURES

PROCEDURE

LETTER

COMPONENT TEST

LFOIL PATTERN ON THE PRINTED WIRING BOARD TEST

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.

1.Foil pattern check and repairs.

1)Disconnect the power supply cord and then remove outer case.

2)Open the door and block it open.

3)Discharge high voltage capacitor.

4)Follow the troubleshooting guide given below for repair.

STEPS	OCCURRENCE	CAUSE OR CORRECTION
1	Only pattern at "a" is broken.	*Insert jumper wire J1 and solder.
2	Pattern at "a" and "b" are broken.	*Insert the coil RCILF2003YAZZ between "c" and "d".

5)Make a visual inspection of the varistor. Check for burned damage.

	a	RY2		5
RY1				VRS1
	c		d	CNA
			J1
	b

6)Reconnect all leads removed from components during testing.

7)Re-install the outer case (cabinet).

8)Reconnect the power supply cord after the outer case is installed.

9)Run the oven and check all function.

2.Follow the troubleshooting guide given below, if indicator does not light up after above check and repairs are finished.

1)Disconnect the power supply cord and then remove outer case.

2)Open the door and block it open.

3)Discharge high voltage capacitor.

4)Disconnect the leads to the primary of the power transformer.

5)Ensure that these leads remain isolated from other components and oven chassis by using insulation tape.

6)After that procedure, re-connect the power supply cord.

7)Follow the troubleshooting guide given below for repair.

STEPS	OCCURRENCE	CAUSE OR CORRECTION
	The rated AC voltage is not present between
1	Pin No. 5 of the 3-pin connector (A) and the	Check supply voltage and oven power cord.
	common terminal of the relay RY1.

8)Disconnect the power supply cord and then remove outer case.

9)Open the door and block it open.

10)Discharge high voltage capacitor.

11)Reconnect all leads removed from components during testing.

12)Re-install the outer case (cabinet).

13)Reconnect the power supply cord after the outer case is installed.

14)Run the oven and check all functions.

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