Read Sharp R-21ATP Service Manual online
16
R-21ATP
When the memory IC (IC2) or control unit is exchanged, input the relay timing to the memory IC (IC2), referring to the
"How to input the relay timing". Otherwise the oven will make a big noise when starting.
"How to input the relay timing". Otherwise the oven will make a big noise when starting.
How to input the relay timing
... Flashing / ... 0.1sec BUZZER
PAD
DISPLAY
INDICATOR
PHONE
(Door close)
.
.
CHECK
.
CHECK No.
CHECK
8 2 6 8
CHECK
(user total count)
SIGNAL
SIGNAL
DOUBLE
3 4 5 6
QUANTITY
(service total count upper figure 3456XX)
7
7
No.
(after 1 sec.)
3 8 6 9
SET
0
3. 8. 4. 9
3 8 4 9
x 4
SET
3 8 4 9
CHECK
.
AT24C02 is a 2K-bit, serial memory, enabling CMOS to be erased/written electrically. This memory is constructed with
256 registers x 8bits, enabling individual access, read and write operations to be performed. Details of input/output signal
for IC2 are as shown in the following diagram.
256 registers x 8bits, enabling individual access, read and write operations to be performed. Details of input/output signal
for IC2 are as shown in the following diagram.
Memory IC (IC2)
Table 1. Relation between Pin Nos, and Signals
Pin No.
Signal
I/O
Description
1-3
A0-A2
IN
Connected to +5V.
4
VSS
IN
Connected to GND.
5
SDA
IN/OUT
Serial data input/output : input/outputs data to IC1.
6
SCL
IN
Clock signal input : input/outputs sireal data at every one pulse.
7
TEST
IN
Connected to GND.
8
VCC
IN
Connected to +5V.
FUNCTIONAL DIAGRAM
E PROM
256 x 8
2
START
STOP
LOGIC
CONTROL
LOGIC
SLAVE ADDRESS
REGISTER
COMPARATOR
H.V. GENERATION
TIMING
& CONTROL
64
YDEC
8
DATA REGISTER
Dout
CK
3
1
5
64
XDEC
START CYCLE
INC
LOAD
WORD
ADDRESS
COUNTER
COUNTER
R/W
PIN
Dout
ACK
ACK
(6) SCL
(5) SDA
(4) Vss
(3) Vcc
A0
A1
A2
VSS
VCC
TEST
SCL
SDA
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