Table of Contents
Advertisement
3.37 UP jDOWN CONTROL CIRCUIT
(Refer to circuit diagram Fig-37)
There are 5 pairs of UP/DOWN key mounted on
control panel which is connected to the microproces-
sor pins 5, 6, 7, 26, 27, 28, 29.
Pins 5, 6, 7 are key scan output,it output key-scan
signal to external key matrix. The key scan operation
is performed when the signal state is active "low".
Pins 26, 27, 28, 29 are key return input, they return
signal from external matrix, the key-scan operation is
performed when the signal state is active "LOW".
UP jDOWN CONTROL CIRCUIT
Fig-37
."Y
0512
""""
R543
10K
lMP47C.,32AN
R544
fj
~63
~.
'01<
R90
\~h
0570
!i53,
t~o'~u
0
roo-
r~
3.:>·1<
C
R70
R~33
e
-(j)
C
"7:
KEY
3.3K
®
(1
R72
OUT
R5!!s,
RS34
~
(!
,IH3
3.3K
~
RS,
IL-
R535
@
[
(
Re! (T21
3.11<.
~
~
R13ZtOOJ
r
' - -
R536
8
KO!
n
~.~K
-@
rF.Y
R!"37
e
C
:.tIN
'N
p_
3 .. '1<
-@
KC"
I
-
·~,s
@
(. XO"1
,1<0:"
~~~'
I
-0
· ...
s~
1r:)~:
~
R530
R52!?
P~28
I':-U
-®
13!,:
t3r..I
13~:
-=-r
"
-t!S"
I@
I '
~
0
®
®
(:P
<;>
IcYat-j.
5511
S~O~
loIOOF. S1/.
MEMO!'Y
RF.GAlL
"~
Sf.O~
5510
v.s . .,.
FACTORY
fb"S-
SEn ING
..
~
S~06
v.s .•
S512
"'<
opct
o·
5507
5513
V.c .•
opc.
"'<
550Q
-
~~-
PWB - 170 I- 2
V.C . .,.
®
~'<
0
");.
b~
0,<
~
' - - -
~
P50"
P'H8 '5-10-'
-:0 P'NR'
i
6·1')A:
I
C~Nl
ROL aOARI)
PSI I
P
I PS!
I
TO PWfj-!691
PS03
~~
S501
H.S.t
'~
S~02
H.S .•
b,<
0.:
5503
H.C."
"' & :
5504
H.c ....
PWg-
I?OIA-2CQN~ROL
BOARD
TEST
CONDITION
Fh=31KHz
TEST
POINT
M14-M20
TEST POINT NAME
CLOCK SIGNAL
M14
I
,
!
.
'
..
.,
r--
-
--
r-
I
I
. ---
,..
..
--
.--
....... L -
f -
u....
-:
-r
M15
5 Vpp
rr
rT
T -- · .. · ..
T ....
-r-T-r-:
1--
'--1
1
' - -1-. . . .
1 ..... , .. _ ... 1-_ .. / ......
'1' ......... _ ..
1
I
•
I
. . :
!
'm!
I
! ,
i.,
i
.
. . -1"-' " .-
r~'"
:'-1
1
'j' . . _,
-or .- _.... '-'
1' ' ' - , ; ....
·T--·I·
' - ' 1 .
t-....... - ..
·1- ... , .... _. '-" ·1· .. -·
'I' . . . . . .
t . . . . . .
j---!
- . . . _-
d,~
. - ' - -_ .....
~
j·_·-t .. _· " .... I
_ .. _ . . .
-"'''f~._.L
.........
l . . . .
·L ....
·I ......
l . . . .
· ~
. . . . . . . . . . ' - --' - --' . ..J_
._,_J __
~~_.
M 1 6 5 Vpp
M17
1 Vpp
r~~-
. . . .
-i-·-.. ·T--r---·r ....
r . . . .
l
, . . . . . . .
·-~-·I
. . . .
·t . . · . . · . . . . . .
·! .... · ..
I· .. · ..
·t .. _ . . · , · ....
··1
F . . -.
' - 1! ..
-+-. . . .
1· ....... · ..
+ . .
-1 . . . .
t . . · . .
t"-' ' ' I
... _____
~--._ ~
-- .. ----.1---...... -- ..
J,; •• __ ...... _-_ •
.,l
i '
1
I
!
,
I
I
•
•
I ....
~.
"11 .. _ ...
1 . . . . . . .
1. . . . .... · .. I ....
·l . . [ · . .
--1-.. -/
!
t
I
I
i
I
!
I
i
t
~-~+L-~: = F I [ . - · · . - · - r · ~ . - . - . - r · · · ~ · ~ · 1 1
L _L . . .
~.......
. . .
._~
__
._L_L ......
M18
1.5 Vpp
=
3-30
=
Advertisement
Chapters
Table of Contents
