Sharp Carousel R-1514, Дополнительное сервисное руководство

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8
R-1514
L TOUCH CONTROL PANEL ASSEMBLY TEST
L Q CK
CONTROL UNIT AH SENSOR SHORTED OR OPENED WIRING
The oven stops and "ERROR" is displayed or does not end during Sensor Cooking
condition. (Oven does not shut off after a cup of water is boiling by Sensor Cooking.)
Oven stops at 32 seconds after starting.
TEST PROCEDURE
PROBLEM
CONDITION
SENSOR
COOKING
CONDITION
POSSIBLE CAUSE
AND
DEFECTIVE PARTS
NOTE: For additional troubleshooting procedures, please refer back to the R-1500/1501/R1505/1506 base model
Service Manual.
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore,
unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter
and ohmmeter. In this service manual, the touch control panel assembly is divided into two units, Control
Unit and Key Unit, and also the Control Unit is divided into two units, LSI Unit and Power Unit, and
troubleshooting by unit replacement is described according to the symptoms indicated.
Before testing,
1) Disconnect the power supply cord, and then remove outer case. Refer to procedure of “ HOOD
EXHAUST LOUVER REMOVAL ”, “ REMOVAL OF OVEN FROM WALL ” and “ OUTER CASE
REMOVAL ”.
2) Open the door and block it open.
3) To discharge high voltage capacitor, wait for 60 seconds.
4) Remove two (2) screws holding the hood intake duct R to the ovencavity top plate and the base
plate R. And remove the hood intake duct R.
5) Disconnect the leads to the primary of the power transformer.
6) Ensure that these leads remain isolated from other components and oven chassis by using
insulation tape.
1. Key Unit.
NOTE ;
1) Check key unit ribbon connection before replacement.
2) Re-install the hood intake duct R with two (2) screws.
3) Re-install the outer case (cabinet).
4) Reconnect the power supply cord after the outer case is installed.
5) Run the oven and check all functions.
The following symptoms indicate a defective key unit.
a) When touching the pads, a certain pad produces no signal at all.
b) When touching a number pad, two figures or more are displayed.
c) When touching the pads, sometimes a pad produces no signal.
If the key unit is defective.
1) Disconnect the power supply cord, and then remove outer case.
2) Open the door and block it open.