Sony UP-895 - System Control and Thermal Head Operation

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