Read Sharp R-2498G (serv.man2) Service Manual online
19
R-2498G
Pin No.
Signal
I/O
Description
20 msec
During cooking
H
L
GND
-5V
48 sec.
OFF
ON
ß(50Hz)
GND
VP
H
L
GND
VP
ß(50Hz)
P07
P06
P05
P04
P03
P02
GND
VP
GND
-5V
32 sec.
OFF
ON
26
INT0
IN
Signal synchronized with commercial power source freqency.
This is basic timing for all time processing of LSI.
This is basic timing for all time processing of LSI.
27
RESET
IN
Auto clear terminal.
Signal is input to reset the LSI to the initial state when power is supplied. Temporarily set
to "L" level the moment power is supplied, 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 supplied. Temporarily set
to "L" level the moment power is supplied, at this time the LSI is reset. Thereafter set at
"H" level.
28-29
P71-P70
OUT
Terminal not used.
30
XIN
IN
Internal clock oscillation frequency setting input.
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.
31
XOUT
OUT
Internal clock oscillation frequency control output.
Output to control oscillation input of XIN.
Output to control oscillation input of XIN.
32
VSS
IN
Power source voltage: -5V.
VC voltage of power source circuit input.
VC voltage of power source circuit input.
33
P27
OUT
Oven lamp, Blower motor and Stirrer motor driving signal (Square Waveform :
50Hz).
To turn on and off the shut-off relay (RY1). The
Square waveform voltage is delivered to the RY1
relay driving circuit and relays (RY2, RY3 COOK
RELAY) control circuit.
50Hz).
To turn on and off the shut-off relay (RY1). The
Square waveform voltage is delivered to the RY1
relay driving circuit and relays (RY2, RY3 COOK
RELAY) control circuit.
34
P26
OUT
Terminal not used.
35-36
P25-P24
OUT
Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay. In100% power level operation, "L" level during cooking;
"H" level otherwise. In other power level operation (50, 20, or 10%), "H" and "L" level is
repeated according to power level.
To turn on and off the cook relay. In100% power level operation, "L" level during cooking;
"H" level otherwise. In other power level operation (50, 20, or 10%), "H" and "L" level is
repeated according to power level.
P0WER LEVEL
ON
OFF
50%
26sec.
22sec.
20%
12sec.
36sec.
10%
8sec.
40sec.
37-38
P23-P22
OUT
Terminal not used.
39-48
P21-P10
OUT
Segment data signal.
The relation between signals and indicators are as follows:
The relation between signals and indicators are as follows:
Signal
Segment
Signal
Segment
P01 .............. i
P15 ............. f
P00 .............. j,k
P14 ............. e
P21 .............. LB
P13 ............. d
P20 .............. UB
P12 ............. c
P17 .............. h
P11 ............. b
P16 .............. g
P10 ............. a
49-54
P07-P02
OUT
Digit selection signal.
The relation between digit signal and digit are as follows:
The relation between digit signal and digit are as follows:
Digit signal
Digit
P07 .............. 1st.
P06 .............. 2nd.
P05 .............. 3rd.
P04 .............. 4th.
P03 .............. 5th.
P02 .............. 6th.
P06 .............. 2nd.
P05 .............. 3rd.
P04 .............. 4th.
P03 .............. 5th.
P02 .............. 6th.
Normally, one pulse is output in every ß period,
and input to the grid of the Fluorescent Display.
and input to the grid of the Fluorescent Display.
55-56
P01-P00
OUT
Segment data signal.
Signal similar to P21.
Signal similar to P21.
57-64
P37-P30
OUT
Terminal not used.
Click on the first or last page to see other R-2498G (serv.man2) service manuals if exist.