Read Sharp XE-A102 (serv.man2) Service Manual online
XE-A102
HARDWARE DESCRIPTION
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CHAPTER 4. HARDWARE DESCRIPTION
1. OUTLINE
2. BLOCK DIAGRAM
3. DISCRIPTION
1)
DISPLAY
(Output Timing of STROBE signal)
2) KEYBOARD AND MODE SW
MODE SW, KEY MATRIX is follows.
*Note: Although the XE-A102 has 30 keys, the keyboard circuit is
actually 32 keys (+) the PF key.
3) BUZZER
The BUZZER is driven by the P75/BUZ signal of the CPU.
Frequency : 4.095kHz
• CPU
: uPD780023A (ROM 24KB, RAM 1024B)
• KEY BOARD : 30key including PF key
• MODE SW
: 5position slide SW
• DISPLAY
: 7seg.+DP x 8digit LED (YELLOW GREEN) FRONT only (U)
7seg.+DP x 9digit LED (YELLOW GREEN) FRONT only (V)
7seg.+DP x 9digit LED (YELLOW GREEN) FRONT only (V)
• DRAWER
: 1ch, no open sensor
• BUZZER
: 1beep, piezo buzzer
• PRINTER
: M-31(no EURO SYMBOL) (U)
M-31V (V)
6V
CPU
uPD 780023A
D
Printer
M-31
M-31
RAWER
KE Y
BOARD
&
MODE SW
8. 8. 8. 8. 8. 8. 8.
FRONT display :8digit
POWER
SU PPLY
AC
5V
ST1-
∼ST4-,ST5
A1
∼G1,DP1,A2 G2
~
,DP2
KST1
∼KST8
KR1
∼KR6
8.
BU ZZER
MA IN
4.19MHz
For Clock
32.768kHz
Battery
5V
ST4-
ST5- (V)
ST3-
ST2-
ST1-
ST1-
ST2-
ST3-
ST4-
1ms
30~100us
Display
strobe
strobe
SW1
MODE SW
KST2
KR1
KST3
KST4
KST5
1
2
3
4
5
22
31
7
15
16
24
25
26
1
2
8
9
10
17
18
19
27
28
3
4
11
12
21
30
5
6
13
14
32
6
7
13
25
D13
1SS133 KST1
1
2
8
14
D14
1SS133 KST2
11
12
19
9
D15
1SS133 KST3
17
18
3
23
D16
1SS133 KST4
28
24
20
10
D17
1SS133 KST5
30
26
21
4
D18
1SS133 KST6
32
22
15
5
D19
1SS133 KST7
29
31
27
16
D20
1SS133 KST8
KST1
1
2
3
4
5
6
7
8
9
KCN2
KR2 KR6 KR5 KR4 KR3
KEYBOARD
1
2
3
4
5
Rotary SW
REG
POWER
OFF
VOID
X/
X/Flash
F
/PGM
Z
(U)
(V)
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