Read Sharp R-21ATP Service Manual online
R-21ATP
13
The touch control section consists of the following units as
shown in the touch control panel circuit.
shown in the touch control panel circuit.
(1) Control Unit
(2) Key Unit
(2) Key Unit
The principal functions of these units and the signals
communicated among them are explained below.
communicated among them are explained below.
1. Control Unit
Signal of key touch and oven function control are all
processed by one microcomputer.
processed by one microcomputer.
1) Power Supply Circuit
This circuit changes output voltage at the secondary
side of the low voltage (T1) transformer to voltages
required at each part by full wave rectifying circuit,
constant voltage circuit, etc..
side of the low voltage (T1) transformer to voltages
required at each part by full wave rectifying circuit,
constant voltage circuit, etc..
2) Reset Circuit
This is a reset circuit, which enables IC1 to be acti-
vated from initial state.
vated from initial state.
3) Power SYNC Signal Generating Circuit
This is a circuit for generating power SYNC signal by
virtue of the secondary side output of transformer T1.
This signal is used for a basic frequency to time
processing and so on.
virtue of the secondary side output of transformer T1.
This signal is used for a basic frequency to time
processing and so on.
4) Clock Circuit
This is a circuit for controlling clock frequency required
for operating IC1.
for operating IC1.
5) IC1 (Main Processor)
This is a one-chip microcomputer, responsible for
controlling the entire control unit.
controlling the entire control unit.
6) IC2 (Memory Processor)
This is a memory IC, responsible for memory function.
7) IC3
This is a IC for driving light emitting diode.
8) Display Circuit
This is a circuit for driving light emitting diode by IC1
output.
output.
9) Key Input Circuit
This is a circuit for transmitting key input information to
IC1.
IC1.
10) Sound-body Driving Circuit
This is a circuit for driving sound body by IC1 output.
CONTROL PANEL ASSEMBLY
OUTLINE OF CONTROL PANEL
11) Relay Driving Circuit
This is a circuit for driving output relay by IC1 output.
12) 2nd. Interlock Relay Control switch Circuit
This is a circuit for driving IC1 to detect door opening/
closing.
closing.
2. Key Unit
The key unit is composed of a matrix circuit in which
when a key it touched, one of signals P30--P34 gen-
erated by the LSI, is passed through the key and
returned to the LSI as one of signals P24--P27.
This model has 20 Memory pads.
When the oven is shipped, Memory pad 1 to 10 are set
as follows: fig.1.
when a key it touched, one of signals P30--P34 gen-
erated by the LSI, is passed through the key and
returned to the LSI as one of signals P24--P27.
This model has 20 Memory pads.
When the oven is shipped, Memory pad 1 to 10 are set
as follows: fig.1.
Memory No.
Cook Time
Output Power
1
10 sec.
100%
2
20 sec.
100%
3
30 sec.
100%
4
45 sec.
100%
5
1 min.
100%
6
1 min. 15 sec.
100%
7
1 min. 30 sec.
100%
8
2 min.
100%
9
2 min. 30 sec.
100%
0
3 min.
100%
(fig. 1)
This model has a double quantity pad. When the oven
is shipped, Magnification "1.7" is preset in the double
quantity pad.
This model has an express defrost pad. When the
oven is shipped, express defrost is set as follows: fig.2.
is shipped, Magnification "1.7" is preset in the double
quantity pad.
This model has an express defrost pad. When the
oven is shipped, express defrost is set as follows: fig.2.
1 STAGE
2 STAGE
3 STAGE
FORMULA
P = 0.2T
P = 0.15T
P = 0.65T
POWER
60 %
40 %
20 %
T : Total cooling time
(fig. 2)
When 1/2 total cooking time is passed, the signal
will sound and "CHECK" indicator will flash
Click on the first or last page to see other R-21ATP service manuals if exist.