Sharp UP-800 (serv.man19) Service Manual ▷ View online
UP-820N/820F (V)
UP-I04EF HARD DESCRIPTION
7 – 5
(2) PIN Description
Pin No.
SYMBOL
SIGNAL NAME
IN/OUT
FUNCTION
1
IBF_
/IBF
OUT
INPUT BUFFER FULL SIGNAL
2
RES_0
/RES0
OUT
SATELLITE SYSTEM RESET
3
D7_M
D7
I/O
DATA BUS 7 TO MAIN PWB
4
D3_M
D3
I/O
DATA BUS 3 TO MAIN PWB
5
NU
NOT
USED
6
VCC
VCC
+5V
7
/ispEN
IN
isp
ENABLE (PAD) PULL UP
8
A0_S/SDI
SA0/SDIN
IN
SATELLITE ADDRESS BUSS 0/SERIAL DATA IN
(PAD)
9
D6_M
D6
I/O
DATA BUS 6 TO MAIN PWB
10
D1_S
SD1
I/O
DATA BUS 1 TO SATELLITE
11
D4_M
D4
I/O
DATA BUS 4 TO MAIN PWB
12
D0_S
SD0
I/O
DATA BUS 0 TO SATELLITE
13
OE_S_O
/OES
OUT
OUTPUT ENABLE FOR 40 PIN
14
WR_S
/WRS
IN
SATELLITE WRITE SIGNAL
15
CS_S
/CSS
IN
EFT I/F SUB CPU SIDE CHIP SELECT
16
BA2
A2
IN
ADDRESS BASS 2 FROM MAIN PWB
17
GND
GND
GND
18
BA0/SD0
A0/SDOUT
I/O
ADDRESS BASS 0 FROM MAIN PWB/SERIAL DATA
19
D7_S
SD7
I/O
DATA BUS 7 TO SATELLITE
20
D5_M
D5
I/O
DATA BUS 5 TO MAIN PWB
21
D1_M
D1
I/O
DATA BUS 1 TO MAIN PWB
22
RD_S
/RDS
IN
SATELLITE READ SIGNAL
23
WR_
/WR0
IN
OPTION WRITE SIGNAL FROM MAIN PWB
24
RD_
/RD0
IN
OPTION READ SIGNAL FROM MAIN PWB
25
RESET_
/RES
IN
RESET FROM MAIN PWB
26
D3_S
SD3
I/O
DATA BUS 3 TO SATELLITE
27
SCLK
SCKL
IN
SERIAL CLOCK (PAD)
28
VCC
VCC
+5V
29
NU
NOT
USED
30
MODE
MODE
IN
MODE (PAD)
31
BA3
A3
IN
ADDRESS BASS 3 FROM MAIN PWB
32
BA1
A1
IN
ADDRESS BASS 1 FROM MAIN PWB
33
D4_S
SD4
I/O
DATA BUS 4 TO SATELLITE
34
D5_S
SD5
I/O
DATA BUS 5 TO SATELLITE
35
D2_S
SD2
I/O
DATA BUS 3 TO SATELLITE
36
D0_M
D0
I/O
DATA BUS 0 TO MAIN PWB
37
OBF
OBF
OUT
OUTPUT BUFFER FULL SIGNAL
38
D6_S
SD6
I/O
DATA BUS 6 TO SATELLITE
39
GND
GND
GND
40
OE_S_I
/OES
IN
OUTPUT ENABLE FROM 24 PIN
41
BA5
A5
IN
ADDRESS BASS 1 FROM MAIN PWB
42
OPTCS_
/OPTCS
IN
OPTION CHIP SELECT FROM MAIN PWB
43
D2_M
D2
I/O
DATA BUS 2 TO MAIN PWB
44
BA4
A4
IN
ADDRESS BASS 4 FROM MAIN PWB
UP-820N/820F (V)
DISASSEMBLY AND ASSEMBLY
8 – 1
CHAPTER 8. DISASSEMBLY AND ASSEMBLY
1. UPPER CABINET REMOVAL
1) Pull out the display. Rotate it by 90 degrees, and remove the screw.
2) Remove the printer cover.
3) Remove the three screws. Disengage the pawls at the four
positions, and lift the upper cabinet slightly.
4) Disconnect the connectors at the three positions, and remove the
upper cabinet.
2. DISPLAY PWB AND DISPLAY UNIT
REMOVAL
1) Disconnect the connector at the four positions. Remove the screw,
and remove the earth wire. Remove the two screws, and remove
the display PWB.
2) Remove the three screws, and remove the display unit.
UP-820N/820F (V)
DISASSEMBLY AND ASSEMBLY
8 – 2
3. INVERTER PWB, LCD PWB, LCD UNIT,
AND TOUCH PANEL REMOVAL
1) Remove the two screws. Disengage the pawls at the eight positions,
and remove the rear cover.
2) Disconnect the three connectors. Remove the two screws, and
remove the LCD PWB.
3) Disconnect the connector at the two positions. Release the pawl at
one position, and remove the inverter PWB.
4) Remove the six screws, and remove the LCD unit and the touch
panel.
4. PRINTER UNIT REMOVAL
1) Disconnect the connector at one position. Remove the two screws,
and remove the printer unit.
5. PWB REMOVAL
1) Disconnect the connector. Remove two screws, and remove the
PWB unit.
UP-820N/820F (V)
DISASSEMBLY AND ASSEMBLY
8 – 3
2) Remove the two screws, and remove the PWB.
6. TRANSFORMER REMOVAL
1) Disconnect the connector at one position. Remove the four screws,
and remove the transformer.
7. CPU PWB AND MAIN PWB REMOVAL
1) Remove the four screws. Disconnect the direct connector, and
remove the CPU PWB.
2) Disconnect the connector at one position. Remove the five screws,
and remove the main PWB.
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