Sharp AR-F152, Service Manual

Page: 142 / 170

The FAX data stored in the main memory are transmitted to LC8213,
where they are converted into bit map data, which are sent to ASIC
and transmitted to the FAX/PCL MCU PWB for printing.
LZ9FH19 receives image data from FAX/PCL MCU and stores in the
scan data memory. The mage data are transmitted to LC52113 and
converted into MMR format. The converted data are stored in the main
memory then read by FX200 and transmitted to the public line.
6. LCD circuit (AR-F152 only)
A. Outline
The LCD PWB is composed of the 4-bit, single-chip microprocessor,
HD404344, the LCD panel, the key SW block, the LED circuit, and the
shunt regulator circuit. The block diagram is shown below.
The LCD PWB is composed of the key scan process block, the serial
I/O process block, the LED lighting process block, the LCD display
process block, the reset process block, the oscillation circuit, and the
LCD power circuit. These circuits are driven by 5V, and only the LCD
circuit is driven by 12V to generate 5.2V as the LCD display drive volt-
age.
B. CPU pin table
Pin No. Signal name Input/Output
1 LED1 Output
2 LED2 Output
3 LCDRS Input/Output
4 LCDRW Input/Output
5 LCDB4 Input/Output
6 LCDB5 Input/Output
7 LCDB6 Input/Output
8 LCDB7 Input/Output
9 OSC1 Input
10 OSC2 Output
11 GND –
12 KEYCOM1 Output
13 KEYCOM2 Output
14 KEYCOM3 Output
15 KEYCOM4 Output
16 V
CC
–
17 TEST Input
18 /PANEL RESET Input
19 /SCK Input
20 SID Input
21 SOD Output
22 LCDE Output
23 KEYCOM9 Output
24 KEYCOM8 Output
25 LED3 Output
26 KEYCOM7 Output
27 KEYCOM6 Output
28 KEYCOM5 Output
FX164
FX200
NCU
Main Memory
LC8213
ASIC
Buf. Mem.
Prog.ROM
Image.
Memory
CPU Bus
PSTN
Compressed
Image
Image Bus
(FAX reception) Print operation
FAX/PCL
MCU PWB
LZ9FH19
FAX/PCL
MCU PWB
SCAN
DATA
Memory
LCD PWB
FX164 FX200
NCU
Main Memory
ASIC
Buf. Mem.
Prog.ROM
Image.
Memory
CPU Bus
PSTN
Compressed
Image
Image Bus
LC8213
(FAX transmission)
FAX/PCL
MCU PWB
FAX/PCL
MCU PWB
LZ9FH19
SCAN
DATA
Memory
LCD PWB
Key scan section
LED circuit section
LCD power circuit
LCD panel
Oscillation
circuit
FAX board
PWB
LCD PWB
CPU
HD404344
SOD
SCK
SIO
RESET
AR-F152
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