Circuitdescriptionof Controlpwb - Sharp FO-155 Service Manual

FO-155A
FO-355A
[2] Circuit description of control PWB
3) 27CO1O (IC2):pin-32DIP(ROM)
EPROMof 1Mbitequipped withsoftwarefor the mainCPU.
1.General description
4) M5M5255CFP-TOl-l.. (IC4):pin-28SOP(RAM)
Fig. 2 shows the functional blocks of the control PWB,
whichis com-
Line
memoryfor the mainCPUsystemRAM
area and coding/decod-
posedof 4
blocks.
ing process.
Used as the transmission buffer.
MAIN CONTROL BLOCK
, --------------------------
I
I
I
I
1
(2) ROM :
I ;
MODEM BLOCK
I
I
('1
t
I
I
I
(1)
SFE-LC
$ (4) MODEM
(
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(J
I
1,
I
1
I
I I
I
I
I
I
I
I
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1---- .. - . ----- . - .. -------
..--1
Fig. 2 Cont*WB functional block diagram
2. Description of each block
(1) Main control block
The maincontrolblockis composed of ROCKWELL 1
chip fax
engine
(SFE-LC),
ROM (128KByte), RAM
(8KByte)and Modem(R96SHF).
Devices are connected to the
bus to control the
wholeunit.
1) SFE-LC(IC3): pin-144QFP(SFE-LC)
2) R96SHF(DFXL)(IC5): pin-100GFP(MODEM)
The FAXENGINE Integrated Facsimile Controllers.
SFE-LC,containsan internal8 bit microprocessor w ith an external2
Mbyte address space and dedicated circuitry optimized for facsimile
image processing and facsimile machine control and monitoring.
Memoryof recordeddata
such as daily
reportand auto dials.When
the power is turned off, this memoryis backed
up by the lithium
battery.
MIRQn
A[19:O]
D~:O]
RDn
WRn
ROMCSn
CSIO:l]n
MCSn
WAITn
SYNC
REGDMAi
TONE
GPIO~:O~lD~:O]
GP10[10:8~DC[2:O]
GPlo12/cs2tiscLK
GPlo13/cs3mxD
GP1014fCS4nlRxD
GPI01WIR08
GP1017/lR05n
PM[3:oyGPo[3:o]
sM[3:oyGPop:4] i
-VREF
+VREF
VIN
START
CLK1
CLKln
CLK2
VID~l:O]
3
I MC24CPlJControllF
1
I MC24 Meaacellf8bitData.24bitAddress) I
Walchdog"Time~
RealTime Clock
ExtamalCPU Bus
CrystalOscillator
BatteryBackupCircuit
BUS IF 1
Interrupt C ontroller
t
.Tv
Mater Control
+
InternalCPU Bus
+ GPIO
t
Tone
VideoPort
SART
t!
J
ScannerControl & VI*O Processing
~Bit FADC
CCD/CIS Scanner
*
+ u
Themal PrinterIF
5ms,A4/B4 Lines
ShadingCorrectional :1, 1:8)
5 ms Linelime
Edge Enhancement
A4/B4 Lines
DynamicBackground & Contrast
TPH ADC
Control
4 StrobeTPH
Dithering
Qichiese TPH
PWRIGND
TEST
f
TSTCLK
DEBUGn
RES=n
XIN
XOUT
PWRDWNn
BATRSTn
E oPq4:o]
OPI[3:O]
LEDCTL
LCDCS
F TBADI
PCLK
PDAT
PLAT
STRB[3:O]
STRBPOL
Fig.3
5-2