Sharp R-216 (serv.man2) Service Manual ▷ View online
R-216(W)
11
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
RELAY SYMBOL
OPERATIONAL VOLTAGE
CONNECTED COMPONENTS
RY1
Approx. -11.4V D.C.
Oven lamp / Turntable motor / Fan motor
RY2
Approx. -11.0V D.C.
High voltage transformer
CARRY OUT 4R CHECKS.
To protect the electronic circuits, this model is provided with a fine foil pattern added to the input circuit
on the PWB, this foil pattern acts as a fuse. If the foil pattern is open, follow the troubleshooting guide
given below for repair.
Problem: POWER ON, indicator does not light up.
on the PWB, this foil pattern acts as a fuse. If the foil pattern is open, follow the troubleshooting guide
given below for repair.
Problem: POWER ON, indicator does not light up.
CARRY OUT 3D CHECKS.
STEPS
OCCURRENCE
CAUSE OR CORRECTION
1
The rated AC voltage is not present at
Check supply voltage and oven power cord.
Power terminal of CPU connector (CN-A).
2
The rated AC voltage is present at primary
Low voltage transformer or secondary circuit defective.
side of low voltage transformer.
Check and repair.
3
Only pattern at “a” is broken.
*Insert jumper wire J1 and solder.
µ
(CARRY OUT 3D CHECKS BEFORE REPAIR)
4
Pattern at “a” and “b” are broken.
*Insert the coil RCILF2003YAZZ between “c” and “d”.
(CARRY OUT 3D CHECKS BEFORE REPAIR)
(CARRY OUT 3D CHECKS BEFORE REPAIR)
NOTE: *At the time of these repairs, make a visual
inspection of the varistor for burning dam-
age and examine the transformer with
tester for the presence of layer short cir-
cuit (check primary coil resistance).
If any abnormal condition is detected,
replace the defective parts.
age and examine the transformer with
tester for the presence of layer short cir-
cuit (check primary coil resistance).
If any abnormal condition is detected,
replace the defective parts.
CARRY OUT 4R CHECKS.
N
PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE PRINTED WIRING
BOARD (PWB) IS OPEN
BOARD (PWB) IS OPEN
(J1)
CN - A
a
b
c
d
1
5
1
P
T1
VRS1
RY1
12
R-216(W)
Control Unit
Control unit consists of LSI, power source circuit, synchro-
nizing signal circuit, reset circuit, buzzer circuit, encoder
circuit and indicator circuit.
Control unit consists of LSI, power source circuit, synchro-
nizing signal circuit, reset circuit, buzzer circuit, encoder
circuit and indicator circuit.
1) LSI
This LSI controls the encoder signal, tact switch strobe
signal, relay driving signal for oven function, buzzer
signal and LED signal.
signal, relay driving signal for oven function, buzzer
signal and LED signal.
2) Power Source Circuit
This circuit generates voltage necessary in the control
unit.
unit.
Symbol
Voltage
Application
VC
-5.0V
LSI(IC-1)
3) Synchronizing Signal Circuit
The power source synchronizing signal is available in
order to compose a basic standard time in the clock
circuit. It accompanies a very small error because it
works on commercial frequency.
order to compose a basic standard time in the clock
circuit. It accompanies a very small error because it
works on commercial frequency.
4) Reset Circuit
A circuit to generate a signals which resets the LSI to
the initial state when power is supplied.
the initial state when power is supplied.
CONTROL PANEL ASSEMBLY
OUTLINE OF CONTROL PANEL
5) Buzzer Circuit
The buzzer is responsive to signals from the LSI to emit
audible sounds (tact switch touch sound and comple-
tion sound).
audible sounds (tact switch touch sound and comple-
tion sound).
6) 2nd. Interlock Relay Control Switch
A switch to “tell” the LSI if the door is open or closed.
7) Relay Circuit
To drive the magnetron, fan motor, turntable motor and
light the oven lamp.
light the oven lamp.
8) Encoder
The encoder generates the pulse signal, and the pulse
signal is sent to the LSI.
signal is sent to the LSI.
9) Indicator Circuit
Indicator elements are the Light-emitting diodes (LD1-
LD24 and LD30-LD34).
This circuit consists of 4-digits and 8 segments.
LD24 and LD30-LD34).
This circuit consists of 4-digits and 8 segments.
10) Tact Switch
Signal generated in the LSI is sent to the tact switch.
When a tact switch is touched, a signal is completed
through the tact switch and passed back to the LSI
through to perform the function that was requested.
When a tact switch is touched, a signal is completed
through the tact switch and passed back to the LSI
through to perform the function that was requested.
DESCRIPTION OF LSI
LSI
The I/O signal of the LSI are detailed in the following table.
The I/O signal of the LSI are detailed in the following table.
Pin No.
Signal
I/O
Description
1
D3
OUT
Segment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD8, LD16 and LD24).
Signal is input to the cathodes of the light-emitting diodes (LD8, LD16 and LD24).
2
D4
OUT
Signal to sound buzzer.
A: Tact switch touch sound.
B: Completion sound.
A: Tact switch touch sound.
B: Completion sound.
3
D5
OUT
Oven lamp, turntable motor and fan motor driving signal(Square
Waveform : 50Hz).
To turn on and off shut-off relay (RY1).
The square waveform voltage is delivered
to the relay (RY1) driving circuit and
relay(RY2) control circuit.
Waveform : 50Hz).
To turn on and off shut-off relay (RY1).
The square waveform voltage is delivered
to the relay (RY1) driving circuit and
relay(RY2) control circuit.
4
D6
OUT
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2).
In 100% power operation, the signals
hold “L” level during microwave cooking
and “H” level while not cooking. In other
cooking modes (70%, 50%, 30%, 10%)
the signal turns to “H” level and “L” level
in repetition according to the power level.
To turn on and off the cook relay (RY2).
In 100% power operation, the signals
hold “L” level during microwave cooking
and “H” level while not cooking. In other
cooking modes (70%, 50%, 30%, 10%)
the signal turns to “H” level and “L” level
in repetition according to the power level.
A
B
H: GND
L: -5V
0.1 sec
2.0 sec
20 msec
During cooking
H
L
ON/OFF time ratio in Mi-
cro cooking
(a. 32second time base)
cro cooking
(a. 32second time base)
MICRO
ON
OFF
COOK
100%
32sec.
0sec.
70%
24sec.
8sec.
50%
18sec.
14sec.
30%
12sec.
20sec.
10%
6sec.
26sec.
R-216(W)
13
Pin No.
Signal
I/O
Description
5
D7
IN/OUT
Terminal not used.
6
P20
IN
Connected to 0V.
7
P21
IN
Signal coming from touch tact switch.
When tact switch SW2 is touched, a signal will be input into P21. When tact switch
is not touched, the signal is held at “H” level.
When tact switch SW2 is touched, a signal will be input into P21. When tact switch
is not touched, the signal is held at “H” level.
8
P22
IN
Signal coming from encoder.
When the encoder is turned, the contacts of encoder make pulse signals. And
pulse signals are input into P22.
When the encoder is turned, the contacts of encoder make pulse signals. And
pulse signals are input into P22.
9
RESET
IN
Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is applied. Temporarily
set to “L” level the moment power is applied, at this time the LSI is reset. Thereafter
set at “H” level.
Signal is input to reset the LSI to the initial state when power is applied. Temporarily
set to “L” level the moment power is applied, at this time the LSI is reset. Thereafter
set at “H” level.
10
CNVSS
IN
Reference voltage input terminal.
A reference voltage is applied to the A/D converter in the LSI. Connected to VC.
A reference voltage is applied to the A/D converter in the LSI. Connected to VC.
11
XOUT
OUT
Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
Output to control oscillation input of XIN.
12
XIN
IN
Internal clock oscillation frequency input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit
with respect to XOUT terminal.
The internal clock frequency is set by inserting the ceramic filter oscillation circuit
with respect to XOUT terminal.
13
VSS
IN
Power source voltage: -5V.
The power source voltage to drive the LSI is input to VSS terminal. Connected to VC.
The power source voltage to drive the LSI is input to VSS terminal. Connected to VC.
14
VDD
IN
Power source voltage: 0V.
The power source voltage to drive the LSI is input to VDD terminal.
The power source voltage to drive the LSI is input to VDD terminal.
15
N.F
IN
Connected to VSS terminal.
16
INT0
IN
Signal coming from encoder.
Signal similar to INT0. Pulse signals are input into INT0.
Signal similar to INT0. Pulse signals are input into INT0.
17
INT1
IN
Signal to synchronize LSI with commercial power source frequency.
This is basic timing for all real time
processing of LSI.
This is basic timing for all real time
processing of LSI.
18-19
AIN0-AIN1
IN
Terminal to change functions according to the model.
Signal in accordance with the model in operation is applied to set up its function.
Signal in accordance with the model in operation is applied to set up its function.
20
AIN2
IN
Input signal which communicates the door open/close information to LSI.
Door closed; “H” level signal.
Door opened; “L” level signal.
Door closed; “H” level signal.
Door opened; “L” level signal.
21
AIN3
IN
Terminal to change functions according to the model.
Signal in accordance with the model in operation is applied to set up its function.
Signal in accordance with the model in operation is applied to set up its function.
22
P00
OUT
Digit selection signal.
Signal is input to the anodes of the light-emitting diodes (LD30 - LD34).
Signal is input to the anodes of the light-emitting diodes (LD30 - LD34).
23
P01
OUT
Digit selection signal.
Signal is input to the anodes of the light-emitting diodes (LD9 - LD16).
Signal is input to the anodes of the light-emitting diodes (LD9 - LD16).
24
P02
OUT
Digit selection signal.
Signal is input to the anodes of the light-emitting diodes (LD17 - LD24).
Signal is input to the anodes of the light-emitting diodes (LD17 - LD24).
25
P03
OUT
Digit selection signal.
Signal is input to the anodes of the light-emitting diodes (LD1 - LD8).
Signal is input to the anodes of the light-emitting diodes (LD1 - LD8).
26
P10
OUT
Segment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD1, LD9, LD17 and LD30).
Signal is input to the cathodes of the light-emitting diodes (LD1, LD9, LD17 and LD30).
27
P11
OUT
Segment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD2, LD10, LD18 and LD31).
Signal is input to the cathodes of the light-emitting diodes (LD2, LD10, LD18 and LD31).
28
P12
OUT
Segment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD3, LD11, LD19 and LD32).
Signal is input to the cathodes of the light-emitting diodes (LD3, LD11, LD19 and LD32).
29
P13
OUT
Segment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD4, LD12 and LD20).
Signal is input to the cathodes of the light-emitting diodes (LD4, LD12 and LD20).
30
D0
OUT
Segment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD5, LD13, LD21 and LD33).
Signal is input to the cathodes of the light-emitting diodes (LD5, LD13, LD21 and LD33).
31
D1
OUT
Segment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD6, LD14, LD22 and LD34).
Signal is input to the cathodes of the light-emitting diodes (LD6, LD14, LD22 and LD34).
32
D2
OUT
Segment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD7, LD15 and LD23).
Signal is input to the cathodes of the light-emitting diodes (LD7, LD15 and LD23).
20 msec
H : GND
L (-5V)
14
R-216(W)
SERVICING
B. On some models, the power supply cord be-
tween the touch control panel and the oven
proper is so long enough that they may be
separated from each other. For those models,
therefore, it is possible to check and repair the
controls of the touch control panel while keeping
it apart from the oven proper; in this case you
must short both ends of the door sensing switch
(on PWB) of the 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 the
dummy resistor(s) with resistance equal to that
of the controls are used.
proper is so long enough that they may be
separated from each other. For those models,
therefore, it is possible to check and repair the
controls of the touch control panel while keeping
it apart from the oven proper; in this case you
must short both ends of the door sensing switch
(on PWB) of the 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 the
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 termi-
nal 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).
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 termi-
nal 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.
1) Soldering iron: 30W
sembly.
1) Soldering iron: 30W
(It is recommended to use a soldering iron with a
grounding terminal.)
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 prevent-
ing static electricity.
ing 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
abnormal voltage due to static electricity etc. is not
applied to the input or output terminals.
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.
1. Precautions for Handling Electronic Components
This unit uses CMOS LSI in the integral part of the
circuits. When handling these parts, the following pre-
cautions 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 electric-
ity charge in clothes, etc., and sometimes it is not fully
protected by the built-in protection circuit.
In order to protect CMOS LSI.
1) When storing and transporting, thoroughly wrap
circuits. When handling these parts, the following pre-
cautions 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 electric-
ity charge in clothes, etc., and sometimes it is not fully
protected by the built-in protection circuit.
In order to protect CMOS LSI.
1) When storing and transporting, thoroughly wrap
them in aluminium foil. Also wrap PW boards con-
taining them in aluminium foil.
taining them in aluminium foil.
2) When soldering, ground the technician as shown in
the figure and use grounded soldering iron and
work table.
work table.
2. Shapes of Electronic Components
3. Servicing of Touch Control Panel
We describe the procedures to permit servicing of the
touch control panel of the microwave oven and the
precautions you must take when doing so.
To perform the servicing, power to the touch control
panel is available either from the power line of the oven
itself or from an external power source.
touch control panel of the microwave oven and the
precautions you must take when doing so.
To perform the servicing, power to the touch control
panel is available either from the power line of the oven
itself or from an external power source.
(1) Servicing the touch control panel with power
supply of the oven :
CAUTION:
THE HIGH VOLTAGE TRANSFORMER OF THE
MICROWAVE OVEN IS STILL LIVE DURING
SERVICING AND PRESENTS A HAZARD .
THE HIGH VOLTAGE TRANSFORMER OF THE
MICROWAVE OVEN IS STILL LIVE DURING
SERVICING AND PRESENTS A HAZARD .
Therefore, when checking the performance of the
touch control panel, put the outer cabinet on the
oven to avoid touching the high voltage trans-
former, or unplug the primary terminal (connector)
of the high voltage transformer to turn it off; the end
of such connector must be insulated with an insulat-
ing tape. After servicing, be sure to replace the
leads to their original locations.
touch control panel, put the outer cabinet on the
oven to avoid touching the high voltage trans-
former, or unplug the primary terminal (connector)
of the high voltage transformer to turn it off; the end
of such connector must be insulated with an insulat-
ing tape. After servicing, be sure to replace the
leads to their original locations.
A. On some models, the power supply cord be-
tween the touch control panel and the oven itself
is so short that the two can't be separated.
is so short that the two can't be separated.
For those models, check and repair all the
controls (sensor-related ones included) of the
touch control panel while keeping it connected
to the oven.
controls (sensor-related ones included) of the
touch control panel while keeping it connected
to the oven.
approx. 1M ohm
E
C
B
E
C B
Transistor
2SB1238
2SB1238
Transistor
KRA101M
KRA105M
KRA222M
KRC243M
KRA101M
KRA105M
KRA222M
KRC243M
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