Read Sharp MX-XB17 Service Manual online
MX-FX13 ELECTRICAL SECTION 6 - 1
[6] ELECTRICAL SECTION
1. FAX Block diagram
RESET I
C
Speaker
connector
CPU
(S
H7706)
RTC
Volt
age
Regulat
or
Cry
s
tal
Rs
onator
24.576MHz
3.3V
1.8V
PROGRAM
FL
ASH ROM
32Mb
it
WORK
MEMORY
SD
RAM
256Mb
it
MODEM
FAX
ASIC
Vo
lum
e
Change
Vo
ltage
Regulato
r
Spred
Sp
ectru
m
Cry
s
ta
l
Reson
a
tor
14.7456MHz
+5V
Power
Connector
FAX
IM
AGE
MEMORY
FL
ASH ROM
128Mb
it
BACK UP
SRAM
4Mbit
with
Secure
lo
cking
de
v
ice
ST
AT
US L
E
D_0
FAX MAIN PWB
TEL/LIU
Connector
3.3V
1.
9
V
+24V
+12V
PI
C
(PIC16F6
9
0)
Audio
AM
P
FE
T SW
(E
2:JP),
0Ω
(E1
:EX
)
DC/DC
Co
n
v
erto
r
Back up
Battery
Circuit
Filter
S
i3056
S
i301
9
CI Filter
CI Filter
vol
ta
g
e
l
e
vel
vol
ta
g
e
l
e
vel
Message
Ou
tp
ut
Enable
DC
/DC
-150V
Voice
message
Output
Pa
ra
-
ringer
VOICE
CODEC
AM
P
CI
Detection
CI
Detection
S relay
OFF fo
ck
de
te
c
tio
n
MJ
2
(TEL)
Handse
t
conn
ector
(JP)
MJ
1
(LINE)
LIU PWB
Silicon DAA CHIP SET
+5V
S
+5V
+3.
3
V
MDM3.3V
RES
E
T-
FAX_RXD(D)
+24V
FAX_TXD(D)
FAX_CTS(D)-
FAX_RTS(D)-
FAX_RXD(CS)
FAX_TXD(CS)
FAX_CTS(CS)-
FAX_RTS(CS)-
WU
P_
F
A
X-
CN
CT
_F
AX-
P
O
FF-
S
R
AM CL
EAR
+24V
MO
N
_
24V
-
16bit
16b
it
16b
it
16b
it
16bit
16b
it
16bit
Do
w
n
lo
ad
UAR
T
+24V
+1
2
V
+5V
S
PICPGM_E
N
PWON
BT
3.3V
24V
Detection
I2C
SP
MUT
E
-
VOLD
VOLC
VOLB
VOLA
EN
_
B
Z
O
N
-
EN
_
S
PK
ON
-
BZ
+5
V
+5V
Spea
ker
Han
d
set (J
P)
Spea
ker
Mic
ro
pho
ne
O
FF f
o
c
k
detec
tio
n
+5
V
S
MR Rela
y
EC Re
la
y
(N
ot mou
n
t)
MSG(Analog)
GP
O
_
B
T
_CH
E
CK
GPI_nLOW_BAT
Polarity
inversion
Detection
(Not mount)
MCU I
F
Connector
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