Sony UP-D897 - 3-2-8. Read of Buttons; 3-3. USB Interface; 3-4. Thermal Head Block; 3-4-1. Structure

3-2-8. Read of Buttons
The |OPEN }, [COPY], |FEED], and jog dial buttons on
the front panel are monitored. Each button (not including
jog dial buttons UP and DOWN) is shifted to operation
after the falling of a signal is detected. Jog dial buttons UP
and DOWN are shifted to operation after the rising of a
signal is detected.
1c202 Signal name Function
Pin 7 KEY1 OPEN
Pin 98 KEY2 PRINT
Pin 55 KEY3 COPY
Pin 133 KEY4 FEED
( Ping JOG3 ENTER
Pin 54 JOG_UP Roiates the jog dial upward.
Pin 97 JOG_DOWN Rotates the jog dial downward.
A
(JOG1)
B
(JOG2) re rb af
yog_up ——— LS LJ 1
ao.
JOG_DOWN
UP rotation
A
(JOG1)} an on j
B
(JOG2) lel Le Les
JOG_UP
Joa_pown —————J L_J LS 1
DOWN rotation
UP-D897
3-3. USB Interface
A USB2.0 high-speed interface is controlled by IC401
(UPD720122F) on the MA-132 board.
3-4. Thermal Head Block
3-4-1... Structure
A thermal head consists of 1280 dots (64 bits x 20) per
line. There are twenty pairs of blocks below.
VH
Output-stage
transistor
| 064 | Shift register
block
Internal circuit configuration of thermal head
(corresponding to one port)
Print data
DATA
64CLK
CLK
LATCH
«> Head heating time
STROBE
Timing chart
3-4-2. Basic Operation
Each signal is input from IC202 to the thermal head for
operations below.
(1) Print data is input to the shift register block in
synchronization with a CLK pulse. (64-bit data)
(2) The data input in step (1) is moved from the shift
register block to the latch block when a latch pulse is
input.
(3) When a STB pulse is input, the “H” and “L” data of a
latch block turn on and off an output-stage transistor
and a resistor is heated for the color development of
thermosensible paper.
3-3