Read Sharp XE-A202 Service Manual online
XE-A202V
HARDWARE DESCRIPTION
– 8 –
3. CLOCK GENERATOR
1) CPU
Two oscillators are connected to the CPU.
The basic clock X2 is supplied from a 12MHz oscillator.
The basic clock X2 is supplied from a 12MHz oscillator.
If the CPU was not operating properly, the signal does not appear on
this line in most cases.
The sub-clock X1 generates 32.768KHz which is primarily used to
The sub-clock X1 generates 32.768KHz which is primarily used to
update the internal RTC (real time clock).
During the standby mode, it keeps oscillating to update the clock and
monitoring the power recovery.
monitoring the power recovery.
4. RESET CIRCUIT
(1) When the mode switch is placed in the “SRV” position, the reset sig-
nal is sent to the CPU to reset the hardware.
(2) When VDD
t
2.8V, a reset signal is outputted from the reset IC. (S-
80928ANMP)
5. P-OFF CIRCUIT
53
A17
A17
Out
Address bus :17
54
A16
A16
Out
Address bus :16
55
A15
A15
Out
Address bus :15
56
A14
A14
Out
Address bus :14
57
A13
A13
Out
Address bus :13
58
A12
A12
Out
Address bus :12
59
A11
A11
Out
Address bus :11
60
A10
A10
Out
Address bus :10
61
A9
A9
Out
Address bus :9
62
VCC
VDD
In
VDD
63
A8
A8
Out
Address bus :8
64
VSS
VSS
In
VSS
65
A7
A7
Out
Address bus :7
66
A6
A6
Out
Address bus :6
67
A5
A5
Out
Address bus :5
68
A4
A4
Out
Address bus :4
69
A3
A3
Out
Address bus :3
70
A2
A2
Out
Address bus :2
71
A1
A1
Out
Address bus :1
72
A0
A0
Out
Address bus :0
73
P17
ENA2
Out
Paper feed motor :ENA2
74
P16
ENA1
Out
Paper feed motor :ENA1
75
P15
IN2
Out
Paper feed motor :IN2
76
P14
IN1
Out
Paper feed motor :IN1
77
P13
P13
Out
Key/Display
78
P12
P12
Out
Key/Display
79
P11
P11
Out
Key/Display
80
P10
P10
Out
Key/Display
81
D7
D7
InOut
Data bus :7
82
D6
D6
InOut
Data bus :6
83
D5
D5
InOut
Data bus :5
84
D4
D4
InOut
Data bus :4
85
D3
D3
InOut
Data bus :3
86
D2
D2
InOut
Data bus :2
87
D1
D1
InOut
Data bus :1
88
D0
D0
InOut
Data bus :0
89
AN7
STB1
Out
Printer head strobe
90
AN6
LATCH
Out
Printer data latch
91
AN5
P105
Out
Printer head voltage ON
92
AN4
P104
Out
CG ROM Bank
93
AN3
P103
In
VBAT
94
AN2
Vref
In
NU Vret
95
AN1
P101
In
P r i n t e r h e a d v o l t a g e
check
check
96
AVSS
VSS
In
VSS
97
AN0
TH
In
Print head temperature check
98
VREF
VDD
In
VDD
99
AVCC
VDD
In
VDD
100
SIN4
P97
In
Key IN
Pin
No.
SYMBOL
SIGNAL
NAME
In/
Out
Function
11
10
27P
C
CPU
XIN
X1
32.768KHz
32.768KHz
13
18P
C
15
XOUT
XCOUT
XCIN
R
330
330
12MHz
33
IC7
FS781
3.3K
220pF
12MHz
CPU
R
/RESET
C
MODE SWITCH
SRV' position
SRV' position
VDD
11
R
C
VDD
IC
S-80928ANMP
R
VCC
VLED
R15
2.7K
2.7K
R16
9.1KG
R20
2.7K
/POFF
C15
0.1uF
5
6
7
8
4
IC4B
BA10393
P-OFF
ZD4
MTZJ5.1B
MTZJ5.1B
R19
56K
3
2
1
8
4
IC4A
BA10393
R17
0
R18
3.9K
C14
1uF/50V
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