Read Sharp R-741M (serv.man2) Service Manual online
10
741M -
51
SEG0
OUT
Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to P23 terminal while the
tact switch SW60 is touched.
tact switch SW60 is touched.
52
SEG1
OUT
Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to P23 terminal while the
tact switch SW61 is touched. A pulse signal is input to P20 terminal while the tact
switch SW64 is touched.
tact switch SW61 is touched. A pulse signal is input to P20 terminal while the tact
switch SW64 is touched.
TOUCH CONTROL ASSEMBLY/ DESCRIPTION OF LSI
Pin No.
Signal
I/O
Description
53
SEG2
OUT
Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to P23 terminal while the
tact switch SW63 is touched. A pulse signal is input to P20 terminal while the tact
switch SW65 is touched.
tact switch SW63 is touched. A pulse signal is input to P20 terminal while the tact
switch SW65 is touched.
54
SEG3
OUT
Tact switch strobe signal.
Signal applied to tact switch section. A pulse signal is input to P23 terminal while the
tact switch SW62 is touched. A pulse signal is input to P20 terminal while the tact
switch SW66 is touched.
tact switch SW62 is touched. A pulse signal is input to P20 terminal while the tact
switch SW66 is touched.
55-58
SEG4-
OUT
Terminal not used.
SEG7
59-63
SEG8-
OUT
Segment data signal.
SEG12
Signal is similar to SEG13. Connected to LCD.
64
NC
No connection terminal.
WARNING:
Before carrying out any work carry out 3D checks
1)
D
isconnect the supply.
2)
D
oor opened, and wedged open.
3)
D
ischarge high voltage capacitor.
WIRING / RE-WIRING
RE-WIRING
Ensure the following:
1.
Wires must not touch:
a)
High voltage parts.
(Magnetron, high voltage transformer, high voltage capacitor and high voltage rectifier assembly)
(Magnetron, high voltage transformer, high voltage capacitor and high voltage rectifier assembly)
b)
Parts that become hot.
(Heating elements, oven lamp, oven cavity magnetron and high voltage transformer)
(Heating elements, oven lamp, oven cavity magnetron and high voltage transformer)
c)
Sharp edges.
(Bottom plates, oven cavity, waveguide flange, chassis support and other metallic parts)
(Bottom plates, oven cavity, waveguide flange, chassis support and other metallic parts)
d)
Movable parts.
(Fan blade, any motor, switch, switch lever and open button)
(Fan blade, any motor, switch, switch lever and open button)
2.
Positive lock connectors are fitted correctly. Ensure the locking pin is located correctly.
3.
Wires are connected correctly as per pictorial diagram.
4.
No wire leads are trapped by the outer wrap.
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