Sharp R-8320E, Service Manual

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Pin No. Signal Description
1 IN Connected to GND (0 volt).
2 IN To change over power source frequency.
60 Hz area: “H” level (OV: GND)
50 Hz area: “L” level (-15V: VDD)
Note: Normally connected to “H” level (GND) by jumper wire.
3 IN To change over temperature indicate mode
unit: “H” level (OV: GND)
unit: “L” level (-15V: VDD)
Note: Normally connected to “L” level (VDD) by printed pattern.
4 T’4 OUT Terminal not used. Connected to
GND.
5
VREF
IN Reference voltage input terminal
A reference voltage applied to the A/D converter in the LSI to
convert the oven temperature detected by the thermistor at A/D.
The reference voltage is generally maintained at -6.4 to
6
7
IN
IN
Temperature measurement input.
By inputting DC voltage corresponding to the temperature detected by the
thermistor, this input is converted into temperature by the A/D converter in
which LSI
is built in.
The following is the relationship between signals and detected temperatures.
(Low temperature measurement) . . . .
K 9 (High temperature measurement). . . .
250°C
8 IN Signal coming from touch-key.
When either one of , , or key is touched,
a corresponding signal out of will be input into
When no key is touched , the signal is held at “L” level
9 IN Signal similar to
When either one of
, ,
a corresponding signal will be input into
10 IN Signal similar to
When either one of , or key is touched, a correspond-
ing signal will be input into
11 IN Signal similar to
When either one of
, , or [CONVECTION)
key
is touched,
a corresponding signal will be input into
12
13 K
12
IN
IN
Terminal not used.
To input a signal which communicates the damper open/close information to LSI.
Damper opened:
“H” level signal (OV: GND)
Damper closed: “L” level signal (-15V: VDD)
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