Power Unit Circuit - Sharp R-318BK Service Manual

4. If the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon cable
is making good contact, verify that the door sensing switch (stop switch) operates properly; that is the
contacts are closed when the door is closed and open when the door is open. If the door sensing
switch (stop switch) is good, disconnect the flat ribbon cable that connects the key unit to the control
unit and make sure the door sensing switch is closed (either close the door or short the door sensing
switch connecter). Use the Key unit matrix indicated on the control panel schematic and place a
jumper wire between the pins that correspond to the STOP/CLEAR pad making momentary contact.
If the control unit responds by clearing with a beep the key unit is faulty and must be replaced. If the
control unit does not respond, it is faulty and must be replaced. If a specific pad does not respond,
the above method may be used (after
clearing the control unit) to determine if
the control unit or key pad is at fault.
5. Reconnect all leads removed from
components during testing.
6. Re-install the outer case (cabinet).
7. Reconnect the power supply cord after
the outer case is installed.
8. Run the oven and check all functions.
1
A
B
AC
C
TURNTABLE
MOTOR
D
OVEN LAMP
FAN
MOTOR
AC
E MICRO
AC
F
G
H
1
2
3
D1-D4
11ES1
T1
1 4
A 1
D3
d
D4
A 2
3 6
a b
V
R
c
RY1
N.O.
D7
COM
RY2
N.O.
D8
COM
: IF NOT SPECIFIED, 1/4w ± 5%
NOTE
: IF NOT SPECIFIED, 1SS270A
2
3
G 8 G 7
5
4
G 9
0 9
G10
MINUTE Chicken
G11
PLUS pieces
AUTO
START
G12 START
CLOCK
4
LD1 LD2 LD3 LD4 LD5
LD1-LD5
WH-1
V
R
R4 27
Q2 2SB1238
R5 4.7k
D5 D6
D1
+
+
D2
– –
Q1
2SB1238 V
A
R2 680 1/2w
SP1
R6 3.3k
Q3 DTD143ES
+
C5
10µ/35v
–
V
R
4
7
G 6 G 5 G 4 G 3
3 2 1
Reheat Popcorn
Baked
8 7 6
potato
Vegetables
Ground meat
Chicken Fish /
INSTANT
breast seafood
Frozen Ground meat
Steaks /
Frozen
roll / COMPU
chops
entrees
muffin
DEFROST
5
VA
C 1
C 2 GND
VC
C 3
C 4 INT
C 5 BUZZER
TURNTABLE
MOTOR
C 6
OVEN LAMP
FAN
MOTOR
C 7
MICRO
C 8
C 9
SH-B
DOOR
SWITCH
SH-A
5
R-318BK
G 2 G 1
KITCHEN
Fresh
TIMER
POWER
LEVEL
ACTION
Fresh
STOP
roll /
CLEAR
muffin
6
A
B
C
D
E
F
G
H
6