Sony UP-960, Service Manual

Page: 44 / 94

4-14 UP-960(UC)
UP-960CE(CE)
Stair Generation
INTV
STB
CLK
DATA1-16
DR
0 1 2 3 4 253 254 255
128CLK
T0 T1 T2 T3 T4 T253 T254 T255
5.75 MHz
1st stair 2nd stair 3rd stair 4th stair 5th stair 253rd stair 255th stair 254th stair
DATA DATA DATA DATA DATA DATA DATA DATA
128 data transmission as head one block
In all 10 blocks of data are transferred in parallel.
(128 data
x 10 = 1280 data)
1
4-5-2. Basic Operation
All the signals are inputted to the head from the gate array IC601. This section only explains the operations for one block.
(The operations for the other blocks are the same.)
(1) The 128 data of print data are inputted to the shift register synchronized with CLK.
(2) When the STB pulse is inputted, the data inputted in (1) is moved from the shift register section to the latch section.
(3) When the DR pulse is inputted, the output stage transistors are switched ON/OFF by the “H” and “L” latch section data.
While the transistor is turned ON, the resistors heat up and thermosensitive paper changes color. The amount of heat
generated is controlled by varying the length of the DR pulses, so the color darkness of the printing on thermosensitive
paper can be varied.
Note : The BEO terminal goes from “L” to “H” when starting the print, from “H” to “L” when print is ended.