Sharp SF-1014 Service Manual page 108

Pin No. Port Signal name
56 P04 SMG
57 P03 SPPD
58 P02 KEY2
59 P01 KEY1
60 P00 KEY0
61 P87 OP-DATA
62 P86 NC
63 P85 OP-CLK
64 P84 OP-LATCH
65 P83 UN-DATA
66 P82 NC
67 P81 UN-CLK
68 P80 UN-LATCH
69 Vcc Vcc
70 AVcc AVcc
71 V V
REF REF
72 AV AV
SS SS
73 Vss Vss
74 P77 ANS
75 P76 MBT
76 P75 CLV
77 P74 RTH
78 P73
79 P72
80 P71 TCSA
(3) Start/stop control circuit
1 General
The circuit senses ON/OFF state of the power source to control
start/stop of the circuits.
The DC power section supplies power voltages (V
VC=+10V, VD1=5V, VD2=5V).
After the power voltage reaches the specified level, the circuit opera-
tion is started. Before the power voltage falls below the specified
level, the circuit operation is stopped, preventing against malfunc-
tions.
5V2
IC113
1
VCC
2
5
NC /RESET
4 3
CAP GND
C134
22000PF
M51953BL
C106
0.1uF
IN/OUT H/L
OUT H Transport motor gain signal
IN H Paper entry detecting signal
IN L Operation PWB key input signal
IN L Operation PWB key input signal
IN L Operation PWB key input signal
OUT Serial data output to operation PWB
— — (NC)
OUT Data output clock signal to operation PWB
OUT Data latch signal to operation PWB
OUT Serial data output to lower unit PWB
— — (NC)
OUT Data output clock signal to lower unit PWB
OUT Data latch signal to lower unit PWB
Power (5V)
Analog/Digital convertor reference power voltage
Analog/Digital convertor reference voltage input
Analog/Digital convertor ground pin
Power (GND)
IN Analog input signal (SPF sensor input)
IN Analog input signal (Main PWB destination setting)
IN Analog input signal (Copy lamp control)
IN Analog input signal (Fusing thermistor)
Not used
Not used
IN Analog input signal (Toner density sensor)
=+32V, VB=+24V,
H
RESET
5V2
28
CPU
(IC110)
R145
2.4kJ
RESET1
C135
22000PF
RESET2
Description
12 – 5