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15
SF-7200
2. Main Circuit (see the circuit diagram)
(1) Main circuit-1
@ 1C101 signal description
AB15
Address bus
NC
1
a
Supply voltage select detect signal.
| Wait |
Wait
Connected to VD1
WwW
Low state (OV) of the signal writes
data in 1/O and RAM
Low state (OV) of the signal read
1/O and RAM contents.
PT input.
ROM select signal.
17
Out
T
N
Cc
PT
Cc
/
1/O port and memory port select
signal. The I/O port is selected
with a high state of the signal.
The memory port is selected with
Cc
I
L
(eo)
5
N
R
10/M
a low state of the signal.
Poms iene
Out
HL
Heater lamp actuating signal.
A high state of this signal (+5V)
actuates the heater lamp.
i
CLR
Copy lamp actuating signal
A high state of this signal (+5V)
actuates the copy lamp
SCK
Cc
2
1
P'
C
Connected to VD1.
OV.
N
Reset signal. A low state of this
signal (OV) resets the CPU.
Pt
x2 | Clock pulses
Pf
Xt | Clock pulse,
ee
<a
| Out | 20 | Switch sensing
strobe.
i
i
| 22
oO
Out
Power relay actuating signal.
A high state of this signal (+5V)
actuates the power relay.
o
i)
N nN
~N
34
Out
Switch sensing strobe.
Switch sensing strobe.
Auto exposure mode select signal.
A high state of this signal (+5V)
AE
sets the copier in the auto exposure
mode,
:
Main motor relay actuating signal
A high state of this signal (+5V)
actuates the main motor
TFC
Table feed clutch actuating signal
A high on this line actuates the
table feed.
"SL
Blank lamp actuating signal. A low
onthis line actuates the blank lamp.
UPFS
Paper feed solenoid actuating signal.
A high state of this signal (+5V)
actuates the paper feed solenoid.
Switch sensing strobe.
; inf
on
| Switch sensing strobe.
eS
a
Switch sensing strobe.
37
39
TRC
Table return clutch actuating signal.
A high on this line actuates the
table return.
[Pin No. | In/Out | Signal name
Description
ka
Switch sensing strobe.
|
4
| Switch sensing strobe.
)
15
Switch sensing strobe.
MDL3
Display drive common signal.
A high state of this signal (+5V)
drives the display common
line.
MDL2
Display drive common signal.
A high state of this signal (+5V)
drives the display common
line.
Display drive common signal.
A high state of this signal (+5V)
drives the display common
line.
Display drive signal. A high state
of this signal (+5V) drives the
display.
15
J
Display drive signal.
A high state of this signal (+5V)
drives the display.
MDL4
Display drive common signal.
A high state of this signal (+5V)
drives the display common
line.
17
RPL
Ready pilot lamp cirde
signal,
A high state of this signal (+5V)
actuates the lamp.
Out
MHVG
MHVG control signal. A high state
of this signal (+5V) actuates the
MHVG.
Out
THVG
THVG control signal. A high state
of this signal (+5V) actuates the
THVG.
Out
DHVG
DHVG
control signal. A high state
of this signal (+5V) actuates the
DHVG.
Out
Y1
Enlarge (x1.2) mode clutch signal.
A high state of this signal (+5V)
actuates the clutch.
Out
Y2
Normal (x1.0) mode clutch signal.
A high state of this signal (+5V)
actuates the clutch.
P23 [|
NC
Notused
Out
Y3
Reduce (x0.8) (x0.75) mode clutch
signal.
A high state of this signal
actuates the clutch.
Reduce (x0.7) (x0.64) mode clutch
signal. A high state of this signal
actuates the clutch.
+5V supply.
DB0~DB7
RESET
Reset signal.
A low on this line
(OV) resets the copier.
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