Sharp R-211M Service Manual ▷ View online
9
211M -
1
RST
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.
2
INT
IN
Signal coming from encoder.
When the encoder is turned, the contacts of encoder make pulse signals. And
pulse signals are input into INT.
When the encoder is turned, the contacts of encoder make pulse signals. And
pulse signals are input into INT.
3
AVSS
IN
A/D converter power source voltage.
The power source voltage to drive the A/D converter in the LSI. Connected to
VC.
The power source voltage to drive the A/D converter in the LSI. Connected to
VC.
4
VREF
IN
Reference voltage input terminal.
A reference voltage is applied to the A/D converter in the LSI.
A reference voltage is applied to the A/D converter in the LSI.
5
K0
IN
Signal coming from potentiometer.
By inputting DC voltage corresponding to the power level set by the potentiometer,
this input is converted into the power level by the A/D converter built into the LSI.
By inputting DC voltage corresponding to the power level set by the potentiometer,
this input is converted into the power level by the A/D converter built into the LSI.
6
K1
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.
7
AVDD
IN
A/D converter power source voltage.
The power source voltage to drive the A/D converter in the LSI.
The power source voltage to drive the A/D converter in the LSI.
8
NC
No connection terminal.
9
S0
OUT
Digit selection signal.
Signal is input to the anodes of the light-emitting diodes (LD19 - LD24).
Signal is input to the anodes of the light-emitting diodes (LD19 - LD24).
10
S1
OUT
Digit selection signal.
Signal is input to the anodes of the light-emitting diodes (LD13 - LD18).
Signal is input to the anodes of the light-emitting diodes (LD13 - LD18).
11
S2
OUT
Digit selection signal.
Signal is input to the anodes of the light-emitting diodes (LD7 - LD12).
Signal is input to the anodes of the light-emitting diodes (LD7 - LD12).
12
S3
OUT
Digit selection signal.
Signal is input to the anodes of the light-emitting diodes (LD1 - LD6).
Signal is input to the anodes of the light-emitting diodes (LD1 - LD6).
13-14
NC
No connection terminal.
15
D0
OUT
Segment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD1, LD7, LD13 and
LD19).
Signal is input to the cathodes of the light-emitting diodes (LD1, LD7, LD13 and
LD19).
16
D1
OUT
Segment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD2, LD8, LD14 and
LD20).
Signal is input to the cathodes of the light-emitting diodes (LD2, LD8, LD14 and
LD20).
17
CNVS
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.
18
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.
19
D2
OUT
Segment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD3, LD9, LD15 and
LD21).
Signal is input to the cathodes of the light-emitting diodes (LD3, LD9, LD15 and
LD21).
20
D3
OUT
Segment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD4, LD10, LD16 and
LD22).
Signal is input to the cathodes of the light-emitting diodes (LD4, LD10, LD16 and
LD22).
21
D4
OUT
Segment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD5, LD11, LD17 and
LD23).
Signal is input to the cathodes of the light-emitting diodes (LD5, LD11, LD17 and
LD23).
22
D5
OUT
Segment data signal.
Signal is input to the cathodes of the light-emitting diodes (LD6, LD12, LD18 and
LD24).
Signal is input to the cathodes of the light-emitting diodes (LD6, LD12, LD18 and
LD24).
DESCRIPTION OF LSI
LSI(IZA882DR)
The I/O signal of the LSI(IZA882DR) are detailed in the following table.
The I/O signal of the LSI(IZA882DR) are detailed in the following table.
Pin No.
Signal
I/O
Description
DIGITAL ANALOGUE CONTROL PANEL
10
211M -
Pin No.
Signal
I/O
Description
ON/OFF time ratio in Micro
cooking
(a. 32second time base)
cooking
(a. 32second time base)
MICRO
ON
OFF
COOK
100%
100%
32sec.
0sec.
70%
24sec.
8sec.
50%
18sec.
14sec.
30%
12sec.
20sec.
10%
6sec.
26sec.
23
D6
OUT
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay (RY2).
In 100% POWER operation, the sig-
nals hold "L" level during microwave
cooking and "H" level while not cook-
ing. In other cooking modes (70%, 50%,
30%, 10%) the signal turns to "H" level
and "L" level in repetition according to
the power level.
In 100% POWER operation, the sig-
nals hold "L" level during microwave
cooking and "H" level while not cook-
ing. In other cooking modes (70%, 50%,
30%, 10%) the signal turns to "H" level
and "L" level in repetition according to
the power level.
24
D7
IN/OUT
Terminal not used.
25
D8
OUT
Oven lamp, turntable motor and fan motor driving signal(Square Wave-
form : 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.
form : 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.
26
NC
No connection terminal.
27
F0
IN
Input signal which communicates the door open/close information to LSI.
Door closed; "H" level signal.
Door opened; "L" level signal.
Door opened; "L" level signal.
28
F1
Terminal not used.
29
F2
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.
30
F3
IN
Signal coming from encoder.
Signal similar to INT. Pulse signals are input into F3.
Signal similar to INT. Pulse signals are input into F3.
31-32
NC
No connection terminal.
33
XOUT
OUT
Internal clock oscillation frequency control output.
Output to control oscillation input of XOUT.
Output to control oscillation input of XOUT.
34
XIN
IN
Internal clock oscillation frequency input setting.
The internal clock frequency is set by inserting the ceramic filter oscillation
circuit with respect to XIN terminal.
The internal clock frequency is set by inserting the ceramic filter oscillation
circuit with respect to XIN terminal.
35
CNTR
OUT
Signal to sound buzzer.
A: key touch sound.
B: Completion sound.
A: key touch sound.
B: Completion sound.
36
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.
20 msec
During cooking
H
L
20 msec
H : GND
L (-5V)
A
B
H: GND
L: -5V
0.12 sec
2.4 sec
DIGITAL ANALOGUE CONTROL PANEL
11
211M -
SERVICING
E
C
B
E
C B
Transistor
2SB1238
2SB1238
Transistor
DTA123ES
DTA143ES
DTD143ES
KRA101M
KRA222M
DTA123ES
DTA143ES
DTD143ES
KRA101M
KRA222M
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 LSI.
1) When storing and transporting, thoroughly wrap
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 LSI.
1) When storing and transporting, thoroughly wrap
them in aluminium foil. Also wrap PW boards
containing them in aluminium foil.
containing them in aluminium foil.
2) When soldering, ground the technician as shown in
the figure and use grounded soldering iron and work
table.
table.
approx. 1M ohm
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 transformer,
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 insulating
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 transformer,
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 insulating
tape. After servicing, be sure to replace the leads to
their original locations.
A. On some models, the power supply cord
between the touch control panel and the oven
itself is so short that the two can't be separated.
itself is so short that the two can't be separated.
For those models, check and repair all the
DIGITAL ANALOGUE CONTROL PANEL
controls (sensor-related ones included) of the
touch control panel while keeping it connected
to the oven.
touch control panel while keeping it connected
to the oven.
B. On some models, the power supply cord
between 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
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).
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
assembly.
1) Soldering iron: 30W
assembly.
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
preventing static electricity.
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
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.
12
211M -
DOOR REPLACEMENT
1.
CARRY OUT 3D CHECKS.
2.
Remove choke cover taking care not to break
clips by inserting an iron plate (thickness of about
0.5mm) or flat type screw driver into the gap between
the choke cover and door panel to free the engaged
part.
clips by inserting an iron plate (thickness of about
0.5mm) or flat type screw driver into the gap between
the choke cover and door panel to free the engaged
part.
3.
Remove door assembly by lifting and easing
it forward.
it forward.
4.
On re-installation make sure the door is
parallel with the bottom line of the oven face
plate and the latch head pass through the
latch holes correctly.
parallel with the bottom line of the oven face
plate and the latch head pass through the
latch holes correctly.
5.
CARRY OUT 4R CHECKS.
NOTE : After any service to the door, the
approved microwave survey meter should be
used to assure in compliance with proper
microwave radiation standards.
used to assure in compliance with proper
microwave radiation standards.
DOOR ASSEMBLY
OUTER CASE
CABINET
CABINET
LATCH HEADS
Figure C-6. Door Assembly Replacement and
Adjustment
COMPONENT REPLACEMENT
OUTER DOOR FILM
INNER DOOR FILM
Removal
1.
1.
Tear the door film from the door panel.
2.
Now the door film is free.
Installation
1.
1.
Tear away the backing film.
2.
Put the pasted side of the door film on the door
panel.
panel.
Removal
1. Remove the door film from the clips on the door frame.
Installation
1. Attach the door film to the clips on the door frame.
1. Attach the door film to the clips on the door frame.
Finger tab
Door film
Backing film
LATCH HEAD REMOVAL
1.
1.
Remove the choke as described in door
replacement.
replacement.
2.
Unhook the spring and lift the latch head clear.
3.
Replacement, the reverse of the above.
MONITORED LATCH SWITCH, LATCH
SWITCH, AND MONITOR SWITCH REMOVAL
SWITCH, AND MONITOR SWITCH REMOVAL
1.
CARRY OUT 3D CHECKS.
2.
Disconnect the leads from all switches.
3.
Remove the one (1) screw holding the latch hook to the
oven cavity.
oven cavity.
4.
Remove the latch hook.
5.
Push the retaining tab slightly and remove the switch.
Figure C-4. Switches
LATCH HOOK
SW3: STOP
SWITCH
SWITCH
SW1: MONITORED
LATCH SWITCH
LATCH SWITCH
SW2: MONITOR
SWITCH
SWITCH
Tab
Post
Tab
Tab
Post
Post
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