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Sharp XE-A110 - Page 8

Sharp XE-A110
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XE-A11OVS
3. Clock generator
5. RESET circuit
The Xl generator 32.768KHz which is primarily used to update the
internal RTC (Real Time Clock).
The X2 generator 12MHz which is used as main clock.
4. P-OFF circuit
frompower suppty circuit
f
>
T
Vo
m
ZD1
\\ ‘M -,
$ ;;K
AI
MTZ6.2B:XE-A110\
MTZ6.2A:XE-A130\
R6
D5
10OK
!
R4 1 C7
5.6K
~ 3.31JF/50V
I
POF
When the power is supplied, vottage Vo from the power supply circuit
rises. When it reaches about 6.2V, point A is driven to HIGH so that
the POF signal of the CPU is fixed to HIGH with Vcc and the CPU
performing power ON process.
When voltage Vo falls below about 6.2V by turning off the power,
point A is driven to LOW to fix the POF signal of the CPU to LOW and
the CPU performs power OFF process.
Since Q1 is turned on by Vcc, the RES signal is driven to LOW to
reset the CPU. After that, discharging of C8 turns off Q1 to drive the
RES signal to HIGH.
6. Printer circuit
TRG
I
Drwer
,#
~~
Trriggermagnet
Ic
I I Vcc I
t
o ‘~ SubTimingpulsdetector
m
I
1
R
I
%y
%
.’~ Reseipulsdetector
I I
,
I I
1
J
I
7. REWIND motor drive circuit
b
h
J
MOTOR
R1o
Fiwm
Q2
IK
7
C37M
Rll
15K
When the RWND signal from
operate the motor.
the CPU is HIGH, Q2 is turned on to
8. DRAWER drive circuit
T
Vo
F
>“-””
R12
OR
03
TK
,C3784
4
R13
1%
I
-7-
When the DR signal from the CPU is HIGH, Q3 is turned on to
operate the solenoid.

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