Service manual

R-820JS
25
Pin No. Signal I/O Description
26 P40 OUT Bottom heater driving signal.
To turn on and off the bottom relay (RY4).
"L" level during grill (TOP AND BOTTOM)
cooking, Convection cooking or Roast
cooking, "H" level otherwise.
The heater relay turns on and off within a
48 second time base in accordance with
the special program in LSI.
27 P77 OUT Convection motor driving signal.
To turn on and off shut-off relay(RY1). "L"
level during CONVECTION; "H" level oth-
erwise. (Relay RY1 does not turn on at
preheating mode.)
28 P76 OUT
Fan motor driving signal.
To turn on and off the fan motor relay RY5. "L"
level during cooking, or for 5 minutes after grill
cooking or for a while after convection or roust
cooking. "H" level otherwise.
29 P75 OUT Grill heaters (TOP HEATER) driving signal.
To turn on and off the grill heaters relay
(RY3). "L" level during grill (TOP GRILL,
TOP AND BOTTOM) cooking, Con-
vection cooking or Roast cooking, "H"
level otherwise.
The heater relay turns on and off within
a 48 second time base in accordance
with the special program in LSI.
30 P74 OUT Magnetron high-voltage circuit driving signal.
To turn on and off the cook relay
(RY2). In HIGH POWER operation,
the signals hold "L" level during mi-
crowave cooking and "H" level while
not cooking. In other cooking modes
(90%, 80%, 70%, 60%, 50%, 40%,
30%, 20%, 10%, 0%) the signal
turns to "H" level and "L" level in
repetition according to the power
level.
31 P73 IN Signal coming from touch key.
When any one of G12 line keys on key matrix is touched, a corresponding signal from
P24, P25, P26, P27, P44, P45, P46 and P47 will be input into P73. When no key is
touched, the signal is held at "L" level.
32 P72 IN Signal similar to P73.
When any one of G11 line keys on key matrix is touched, a corresponding signal will
be input into P72.
33 P71 IN Signal similar to P73.
When any one of G10 line keys on key matrix is touched, a corresponding signal will
be input into P71.
34 P70 IN Signal similar to P73.
When any one of G9 line keys on key matrix is touched, a corresponding signal will
be input into P70.
Power output ON time OFF time
100 % 48 sec. 0 sec.
90 % 44 sec. 4 sec.
80 % 40 sec. 8 sec.
70 % 36 sec. 12 sec.
60 % 32 sec. 16 sec.
50 % 26 sec. 22 sec.
40 % 22 sec. 26 sec.
30 % 16 sec. 32 sec.
20 % 12 sec. 36 sec.
10 % 8 sec. 40 sec.
VARI ON TIME OFF TIME
HIGH POWER 32 sec. 0 sec.
90% 30 sec. 2 sec.
80% 26 sec. 6 sec.
70% 24 sec. 8 sec.
60% 22 sec. 10 sec.
50% 18 sec. 14 sec.
40% 16 sec. 16 sec.
30% 12 sec. 20 sec.
20% 8 sec. 24 sec.
10% 6 sec. 26 sec.
0% 0 sec. 32 sec.
Power output ON time OFF time
100 % 48 sec. 0 sec.
90 % 44 sec. 4 sec.
80 % 40 sec. 8 sec.
70 % 36 sec. 12 sec.
60 % 32 sec. 16 sec.
50 % 26 sec. 22 sec.
40 % 22 sec. 26 sec.
30 % 16 sec. 32 sec.
20 % 12 sec. 36 sec.
10 % 8 sec. 40 sec.
ON
OFF
During
cooking
L
GND
H.
(Convection)
ON
OFF
For 5 minutes after grill, or for a
while after convection or roust.
L
GND
H.