Sharp R-22AT Procedure For Checking/Clearing Service Counts Of Microwave Oven, Servicing Tools

touch control panel with a jumper, which brings about an operational state that is equivalent to the oven door being closed. As for the sensor-related controls of the touch control panel, checking them is possible if dummy resistor(s) with resistance equal to that of the controls are used.

(2)Servicing the touch control panel with power supply from an external power source:

Disconnect the touch control panel completely from the oven proper,and short both ends of the door sensing switch (on PWB) of the touch control panel,which brings about an operational state that is equivalent to the oven door being closed. Connect an external power source to the power input terminal of the touch control panel, then it is possible to check and repair the controls of the touch control panel it is also possible to check the sensor-related controls of the touch control panel by using the dummy resistor(s).

4.Servicing Tools

Tools required to service the touch control panel as- sembly.

R-22AT

R-24AT

1)Soldering iron: 60W

(It is recommended to use a soldering iron with a grounding terminal.)

2)Oscilloscope: Single beam, frequency range: DC- 10MHz type or more advanced model.

3)Others: Hand tools

5. Other Precautions

1)Before turning on the power source of the control unit, remove the aluminium foil applied for preventing static electricity.

2)Connect the connector of the key unit to the control unit being sure that the lead wires are not twisted.

3)After aluminium foil is removed, be careful that abnor- mal voltage due to static electricity etc. is not applied to the input or output terminals.

4)Attach connectors, electrolytic capacitors, etc. to PWB, making sure that all connections are tight.

5)Be sure to use specified components where high precision is required.

PROCEDURE FOR CHECKING/CLEARING SERVICE COUNTS OF MICROWAVE OVEN

The following procedure enables the servicer to obtain the total service counts (cook cycles) for memory cooking, manual, repeat, double quantity cooking and defrost. The maximum capacity of the counter is 999,999 counts, above which the counter will reset to "0". The counter will retain the total counts (will not clear) in the event of a power disruption.

1)Practice for checking total service counts (eg; 234,567 Counts).

			--- flashing / ---0.1sec. BUZZER
PAD	DISPLAY		INDICATOR LED PHONE
(door close)		•
		•
CHECK	NUMBER	•	CHECK
CHECK	#1	82 68	CHECK
	(user total count)
#2
VOLUME
VOLUME
DOUBLE	2 34 56 7
QUANTITY	(service total count)
1	NUMBER	1
	(after 1 sec.)
		45
	(filter used time)
2	NUMBER	2

	(after 1 sec.)
	2 00
	(filter lim. time)
0 (No 10)	NUMBER 10
	(after 1 sec.)
	35 43 2
	(service total cook time)
CHECK	•

#2: Denotes the procedure for the servicer to disable checking/clearing. This procedure is instructed to serv- ice personnel only and is excluded from the operation manual.

2)Practice for clearing Service's counts

"" : Flicker / : 0.1 sec BUZZER

PAD ORDER	DISPLAY			PHONE
(Door close)	•
CHECK	"NUMBER" •		CHECK
CHECK	82 68		"CHECK"
	(User's Total Counts)
#1 VOLUME	82 68		"CHECK"
VOLUME	82 68		"CHECK"
DOUBLE QUANTITY	2 34 56	7 "CHECK"
	(Total Counts Service)
SET		0	"CHECK"
0		0	"CHECK"
SET		0	"CHECK"
CHECK	•

#1: Denotes the procedure for the servicer to disable clearing. This procedure is instructed to service per- sonnel only and is excluded from the operation manual.

#1: Denotes total service counts within the reach of user, of which checking and clearing practices are de- scribed in this instruction manual.

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