4-8
UP-895/(E)
4-4. System Control Section
The system control section mainly consists of a microcomputer (IC304) and performs the following
processing.
4-4-1. Reading of Keys
IC304 monitors the PRINT, OPEN/CLOSE, COPY, FEED, and REMOTE keys on the door panel. Each
key is activated when the falling edge of a signal is detected.
IC304
Signal name
73pin
nDOOR_KEY
74pin
nPRINT_KEY
75pin
nCOPY_KEY
76pin
nFEED_KEY
4-4-2. Reading of Function Switches
IC304 monitors the setting of a front slide switch, inner slide switches, and a rear DIP switch and reflects
its setting on the operation.
Front slide switch (on the front panel)
IC304
Function
Operation
80pin
POSI/NEGA
L:
NEGA
H:
POSI
1pin
STANDERD/SIDE
L:
STANDARD
H:
SIDE
79pin
PRINT SIZE
0.00 V: SMALL
1.25 V: NORMAL
2.50 V: ZOOM1
3.75 V: ZOOM2
5.00 V: ZOOM1&2
Inner slide switches (S1 through S4)
IC304
Function
Operation
5pin
SMOOTH
L:
NORMAL
H:
HIGH
2pin
SHARPNESS
0.00 V: NORMAL
2.50 V: SOFT
5.00 V: HARD
4pin
PAPER TYPE
0.00 V: TYPE
I
1.67 V: TYPE
II
3.33 V: TYPE
III
5.00 V: TYPE
IV
3pin
GAMMA
0.00 V: TONE
I
2.50 V: TONE
II
5.00 V: TONE
III
Summary of Contents for UP-895
Page 1: ...VIDEO GRAPHIC PRINTER UP 895 UP 895CE UP 895MD SERVICE MANUAL 1st Edition ...
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Page 71: ...10 1 UP 895 E 10 1 2 3 4 5 1 A B C D E F G H Section 10 Schematic Diagrams and Board Layouts ...
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