Sharp R930cs Service Manual

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R-930CS
PTOUCH CONTROL PANEL ASSEMBLY 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 troubleshooting by unit replacement is described according to the symptoms indicated.
Before testing,
1) Disconnect the power...

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R-930CS
TEST PROCEDURES
PROCEDURE
LETTERCOMPONENT TEST
2. Control Unit
The following symptoms  indicate a defective control unit.  Before replacing the control unit, perform
the Key unit test (Procedure Q) to determine if control unit is faulty. Reconnect the power supply cord.
And  check for followings.
2-1 In connection with pads.
a) When touching the pads, a certain group of pads do not produce a signal.
b) When touching the pads, no pads produce a signal.
2-2 In connection with indicators
a) At a...

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R-930CS
TEST PROCEDURES
PROCEDURE
LETTERCOMPONENT TEST
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. Remove the outer case and check voltage between Pin Nos. 7 and 9 of the 9 pin...

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R-930CS
TEST PROCEDURES
PROCEDURE
LETTERCOMPONENT TEST
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 and examine the
transformer with a tester for the presence of
layer short-circuit (check the primary...

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R-930CS
TEST PROCEDURES
PROCEDURE
LETTERCOMPONENT TEST
permit adequate ventilation, be sure to install so as not to block these vents. There should be some
space for air circulation.
(5) Be sure the exterior of the cooking container and the interior of the oven are dry. Wipe off any moisture
with a dry cloth or paper towel.
(6) The Sensor works with food at normal storage temperature. For example, chicken pieces would be
at refrigerator temperature and canned soup at room temperature.
(7) Avoid using...

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R-930CS
TEST PROCEDURES
PROCEDURE
LETTERCOMPONENT TEST
(8) After that procedure, re-connect the power supply cord.
(9) Check the sensor cook operation proceed as follows:
9-1. Touch SENSOR COOK pad and then touch the number pad 1. And touch Start pad.
9-2. The control panel is in the sensor cooking operation.
9-3. After approximately 20 seconds, push plunger of select switch for more than 3 seconds. This
condition is same as judgement by AH sensor.
9-4. After approximately 3 seconds, the display shows...

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R-930CS
The touch control section consists of the following units
as shown in the touch control panel circuit.
(1) Key Unit
(2) Control Unit
The principal functions of these units and the signals com-
municated among them are explained below.
Key Unit
The key unit is composed of a matrix, signals P10 - P17
generated in the LSI are sent to the key unit.
When a key pad is touched, a signal is completed through
the key unit and passed back to the LSI through R24 - R27
to perform the function that was...

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R-930CS
VARI MODE ON TIME OFF TIME
P-HI (100% power) 32 sec. 0 sec.
P-90 (approx. 90% power) 30 sec. 2 sec.
P-80 (approx. 80% power) 26 sec. 6 sec.
P-70 (approx. 70% power) 24 sec. 8 sec.
P-60 (approx. 60% power) 22 sec. 10 sec.
P-50 (approx. 50% power) 18 sec. 14 sec.
P-40 (approx. 40% power) 16 sec. 16 sec.
P-30 (approx. 30% power) 12 sec. 20 sec.
P-20 (approx. 20% power) 8 sec. 24 sec.
P-10 (approx. 10% power) 6 sec. 26 sec.
P-0 (0% power) 0 sec. 32 sec.
Pin No. Signal I/O Description
5 AN7 IN Used...

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R-930CS
Pin No. Signal I/O Description
18 P50 OUT
Damper motor relay driving signal.
To turn on and off shut-off relay(RY4).
19 P47 OUTHeating element driving signal.
To turn on and off shut-off relay(RY3). L level
during convection cooking; H level otherwise. Dur-
ing convection cooking, the signal becomes H level
when the temperature of the oven cavity exceeds the
predetermined temperature.
20-21 P46-P45 OUT Terminal not used.
22 P44 OUT
Timing signal output terminal for temperature measurement(OVEN...

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R-930CS
Pin No. Signal I/O Description
37 P23 OUTSegment data signals.
The relation between signals and indicators are as follows:
SignalSegmentSignalSegmentSignalSegmentSignalSegment
P23 ............. P1 P17 ............. P5 P13 ............. P9 P07 ........... P13
P22 ............. P2 P16 ............. P6 P12 ........... P10 P06 ........... P14
P21 ............. P3 P15 ............. P7 P11 ........... P11 P05 ........... P15
P20 ............. P4 P14 ............. P8 P10 ........... P12 P04...