![background image](http://html2.mh-extra.com/html/okidata/okioffice-44/okioffice-44_service-manual_3664619272.webp)
Board Descriptions
A - 29
OKIOFFICE 44 Serv. Man., P/N 59276801
A3.1.7
R44 Circuit Diagram
1.
Block diagram
The circuit diagram consists of connector CN14 that provides an interface between R44 board and
LED print head.
Figure A3.1.7 shows the related signals and block diagram of LED print head.
2.
Function
Data of 1664 LEDs on the LED print head is loaded into the shift registers by the HCLCK (1.0
MHz) signal. After the 1664 bit (208 mm) data is loaded in the shift registers, it is then loaded in
the latch circuit by the HLATCH signal. The turning -on and off of the LEDs are controlled by
STRB1-N to STRB4-N signals.
LED head interface signals output from IOGA1
•
HDATA 0
: Print data i.e., data to be printed
•
HCLCK
: Transfer clock for print data (4.0 MHz)
•
HLATCH
: Latch signal for print data
•
STRB1-N to STRB4-N : LED head strobe signals
Shift register
Latch
Strobe
CN14
8
6
9
10, 11, 12, 13
1, 2
3, 4
5, 14
+5 V
0 V
LED
1664 bits (208 mm)
LED print head
R44
HCLCK (1.0 MHz)
HDATA 0
HLATCH
STRB1-N to STRB4-N
0 VP
+5 V
0 V
IOGA
IC2
Figure A3.1.7 Related Signals and Block Diagram of LED Head
Summary of Contents for OKIOFFICE 44
Page 2: ...All specifications are subject to change without notice Service Manual OKIOFFICE 44 59276801...
Page 135: ...Disassembly 4 6 OKIOFFICE 44 Service Manual P N 59276801 Whole Unit Picture FX048 CP4 1 Fig 01...
Page 329: ...Illustrated Parts List D 6 OKIOFFICE 44 Service Manual P N 59276801 Section 2 Printer Unit...
Page 331: ...Illustrated Parts List D 8 OKIOFFICE 44 Service Manual P N 59276801 Section 3 Operator Panel...
Page 351: ...Illustrated Parts List D 28 OKIOFFICE 44 Service Manual P N 59276801 Section 12 Cables...
Page 357: ...Board Layout E 2 OKIOFFICE 44 Service Manual P N 59276801 MEM eps E 2 MEM PCB...
Page 358: ...Board Layout E 3 OKIOFFICE 44 Service Manual P N 59276801 TEL U eps E 3 TEL U PCB...
Page 359: ...Board Layout E 4 OKIOFFICE 44 Service Manual P N 59276801 Hook eps E 4 Hook PCB...
Page 388: ...OKIOFFICE 44 Service Manual Part Number 59276801 Printed in the USA...