Sharp R9h56 Service Manual

R-9H56
19 TEST PROCEDURES (CONTD)
PROCEDURE
LETTERCOMPONENT TEST
RY413
(J1)
31
CN-A
M
1
357 9  
DAMP
M
CONV MFAN
POWER P S1 S2
T1
ba
c VRS1
d
Problem: POWER ON, indicator does not
light up.
NOTE: *At the time of making these repairs,
make a visual inspection of the
varistor. check for burned  damage
and examine the transformer with an
ohmmeter for the presence of layer
short-circuit (check primary coil
resistance). If any abnormal condition
is detected, replace the defective
parts.
PAH SENSOR TEST...

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20
(3) Remove the AH sensor.
(4) Install the new AH sensor.
(5) Re-install the outer case.
(6) Reconnect the oven to the power supply and check the sensor cook operation, proceed as follows:
6-1. Fill approximately 200 milliliters (7.2 oz) of tap water in a 1000 milliliter measuring cup.
6-2. Place the container on the center of tray in the oven cavity.
6-3. Close the door.
6-4. Touch REHEAT SENSOR pad twice.
6-5. The control panel is in automatic Sensor operation.
6-6. The oven will turn off...

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21
4) ACL Circuit
A circuit to generate a signals which resetting the LSI to
the initial state when power is applied.
5) Buzzer Circuit
The buzzer is responds to signals from the LSI to emit
noticing sounds (key touch sound and completion sound).
6) Temperature Measurement Circuit: Oven
The temperature in the oven cavity is sensed by the
thermistor. The variation of resistance according to
sensed temperature is detected by the temperature
measurement circuit and the result applied to LSI. The
LSI...

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22
1 VCC IN Connected to GND.
2 VEE IN
Anode (segment) of Fluorescent Display light-up voltage: -28V.
Vp voltage of power source circuit input.
3 AVSS IN
Power source voltage: -5V.
VC voltage of power source circuit input.
4 VREF IN
Reference voltage input terminal.
A reference voltage applied to the A/D converter in the LSI. Connected to GND.(0V)
5 AN7 IN Used for initial balancing of the bridge circuit (absolute humidity sensor). This input is
an analog input terminal from the AH sensor circuit,...

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23
The square waveform voltage is delivered
to the relay(RY1) driving circuit and
relays(RY2,RY3,RY5) control circuit.
20-21 P46-P45 OUT Terminal not used.
22 P44 OUT
Timing signal output terminal for temperature measurement(OVEN).
H level (GND) : Ttermistor OPEN timing.
L level (-5V) : Temperature measuring timing.(Convection cooking)
23 P43 OUT
Signal to sound buzzer.
A: key touch sound.
B: Completion sound.
C: When the temperature of the oven cav-
ity reaches the preset temperature in
the...

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24
Pin No. Signal I/O Description
Key strobe signal.
Signal applied to touch-key section. A pulse
signal is input to P24-P27 terminal  while one of
G-5 line keys on key matrix is touched.
38 P22 OUT
Digit selection signal.
The relationship between digit signal and digit are as follows;
Digit signalDigit
P22 ............. 1st.
P17 .......... 2nd.
P14 .......... 3rd.
P06 ........... 4th.
P02 .......... 5th.
P37 ..........  6th.
Normally, one pulse is output in every §
period, and input to the grid...

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25
Pin No. Signal I/O Description
53 P03 OUT
Segment data signal.Signal similar to P23.
Key strobe signal.
Signal applied to touch-key section. A pulse signal is input to P24-P27 terminal  while
one of G-12 line keys on key matrix is touched.
54 P02 OUT
Digit selection signal.Signal similar to P22.
55-56 P01-P00 OUTSegment data signal.Signal similar to P23.
57 P37 OUTDigit selection signal.Signal similar to P22.
58-59 P36-P35 OUTSegment data signal.Signal similar to P23.
60-64 P34-P30 OUT Used for...

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26
1. Precautions for Handling Electronic Components
This unit uses CMOS LSI in the integral part of the
circuits. When handling these parts, the following
precautions should be strictly followed. CMOS LSI have
extremely high impedance at its input and output
terminals. For this reason, it is easily influenced by the
surrounding high voltage power source, static electricity
charge in clothes, etc., and sometimes it is not fully
protected by the built-in protection circuit.
In order to protect CMOS...

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27
COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE
WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below before
operating the oven.
1. Door does not close firmly.
2. Door hinge, support or latch hook is damaged.
3. The door gasket or seal or damaged.
4. The door is bent or warped.
5. There are defective parts in the door interlock system.
6. There are defective  parts in the microwave generating
and transmission assembly.
7. There is visible damage to the oven....

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28
ASYMMETRIC RECTIFIER AND HIGH VOLTAGE RECTIFIER REMOVAL
1. CARRY OUT 3D CHECKS.
2. Remove one (1) screw holding the high voltage rectifier
terminal to the capacitor holder.
3. Disconnect the high voltage rectifier assembly from the
capacitor.CAUTION: WHEN REPLACING HIGH VOLTAGE RECTI-
FIER ASSEMBLY, ENSURE THAT THE
EARTHING SIDE TERMINAL MUST BE SE-
CURED FIRMLY WITH  AN EARTHING
SCREW.
HIGH VOLTAGE CAPACITOR REMOVAL
1. CARRY OUT 3D CHECKS.
2. Disconnect the high voltage wire leads and...