Read Sharp R-2498G (serv.man2) Service Manual online
18
R-2498G
1
VCC
IN
Connected to GND.
2
VEE
IN
Anode (segment) of Fluorescent Display light-up voltage: -35V.
Vp voltage of power source circuit input.
Vp voltage of power source circuit input.
3
AVSS
IN
Reference voltage input terminal.
A reference voltage applied to the A/D converter in the LSI. Connected to DC. (-5V)
A reference voltage applied to the A/D converter in the LSI. Connected to DC. (-5V)
4
VREF
IN
Reference voltage input terminal.
A reference voltage applied to the A/D converter in the LSI. Connected to GND.
A reference voltage applied to the A/D converter in the LSI. Connected to GND.
5-6
AN7-AN6
IN
Terminal to switch the specification.
7
AN5
IN
Temperature measurement input: INTAKE THERMISTOR.
By inputting DC voltage corresponding to the temperature detected by the thermistor,
this input is converted into temperature by the A/D converter built into the LSI.
By inputting DC voltage corresponding to the temperature detected by the thermistor,
this input is converted into temperature by the A/D converter built into the LSI.
8
AN4
IN
A/D input for troubleshooting Magnetron 1.
9
AN3
IN
A/D input for troubleshooting Magnetron 2.
10
AN2
IN
Temperature measurement input: EXHAUST THERMISTOR.
By inputting DC voltage corresponding to the temperature detected by the thermistor,
this input is converted into temperature by the A/D converter built into the LSI.
By inputting DC voltage corresponding to the temperature detected by the thermistor,
this input is converted into temperature by the A/D converter built into the LSI.
11
AN1
IN
Temperature measurement input: MAGNETRON THERMISTOR.
By inputting DC voltage corresponding to the temperature detected by the thermistor,
this input is converted into temperature by the A/D converter built into the LSI.
By inputting DC voltage corresponding to the temperature detected by the thermistor,
this input is converted into temperature by the A/D converter built into the LSI.
12
P60
IN
Input signal which communicates the door open/close information to LSI.
Door closed; "H" level signal (0V).
Door opened; "L" level signal (-5.0V).
Door closed; "H" level signal (0V).
Door opened; "L" level signal (-5.0V).
13
P55
OUT
Power supply output at thermistor detecting circuit.
(Output -5V in cooking only, but apply high impedance to others to prevent thermistor
from electrolytic corrosion ocurrence.)
(Output -5V in cooking only, but apply high impedance to others to prevent thermistor
from electrolytic corrosion ocurrence.)
14-16
P54-P52
OUT
Terminal not used.
17
P51
IN
Signal coming from switch unit.
When either one of switches SW2 and SW4 on the switch unit is pressed, a correspond-
ing signal out of P44 and P43 will be input into P51.
When either one of switches SW2 and SW4 on the switch unit is pressed, a correspond-
ing signal out of P44 and P43 will be input into P51.
18
P50
IN
Signal similar to P51.
When either one of switches SW1,SW3 and SW5 on the switch unit is pressed, a
corresponding signal out of P43,P44 and P45 will be input into P50.
When either one of switches SW1,SW3 and SW5 on the switch unit is pressed, a
corresponding signal out of P43,P44 and P45 will be input into P50.
19
P47
OUT
Signal to sound buzzer.
This signal is to control the 2.5kHz
continuous signal.
A: Switch touch sound.
B: Completion sound.
This signal is to control the 2.5kHz
continuous signal.
A: Switch touch sound.
B: Completion sound.
20
P46
OUT
Terminal not used.
21
P45
OUT
Switch strobe signal.
Signal is applied to the switch unit. A pulse signal is input to P50 terminal while switch
SW5 is pressed.
Signal is applied to the switch unit. A pulse signal is input to P50 terminal while switch
SW5 is pressed.
22
P44
OUT
Switch strobe signal.
Signal is applied to the switch unit. A pulse signal is input to P50 or P51 terminal while
switch SW3 or SW4 is pressed.
Signal is applied to the switch unit. A pulse signal is input to P50 or P51 terminal while
switch SW3 or SW4 is pressed.
23
P43
OUT
Switch strobe signal.
Signal is applied to the switch unit. A pulse signal is input to P50 or P51 terminal while
switch SW1 or SW2 is pressed.
Signal is applied to the switch unit. A pulse signal is input to P50 or P51 terminal while
switch SW1 or SW2 is pressed.
24
P42
IN
Signal coming from encoder.
When the encoder is turned, the contacts of encoder make pulse signals. And pulse
signals are input into P42.
When the encoder is turned, the contacts of encoder make pulse signals. And pulse
signals are input into P42.
25
INT1
IN
Signal coming from encoder.
Signal similar to R42. Pulse signals are input into INT1.
Signal similar to R42. Pulse signals are input into INT1.
DESCRIPTION OF LSI
LSI(IZA648DR)
The I/O signal of the LSI(IZA648DR) is detailed in the following table.
The I/O signal of the LSI(IZA648DR) is detailed in the following table.
Pin No.
Signal
I/O
Description
A
B
0.12 sec
1.2 sec
1.2 sec
GND
-5V
Click on the first or last page to see other R-2498G (serv.man2) service manuals if exist.