Sharp R-1482, R-1480, R-1481 service manual Test Procedures, Component Test, Letter

R-1480

R-1481

R-1482

TEST PROCEDURES

PROCEDURE		COMPONENT TEST
LETTER
	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 and examine the transformer with a tester for the presence of layer short-circuit (check

the primary coil resistance which is approximately 192Ω ± 15%). If any abnormal condition is detected, replace the defective parts.

Q27	B		2		1
	D20	d	(470V)		T1	C100
			VRS1
	b
	(J1)		a
			7			1
		c	7	5	3	CN-A
	RY3					1
AC(H)			AC(N) TTM

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 functions.

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. 7 of the 4-pin connector (A) and the	Check supply voltage and oven power cord.
	common terminal of the relay RY1.
2	The rated AC voltage is present at primary	Low voltage transformer or secondary circuit defective.
	side of low voltage transformer.	Check and repair.

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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