![background image](http://html1.mh-extra.com/html/okidata/ol400/ol400_service-manual_3697857028.webp)
Page: 24
Service Guide OL400
Chapter 2 Principles of Operation
2.3.07 LED Head
Data on the 2,560 LEDs in the LED head is set in the shift register by the HD CLK signal. The
data is loaded in the latch circuit by the HD LD signal.
The on/off states of the LEDs are controlled by the signals STB1- STB4; 640 bits are turned on or
off at a time.
Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA Business
Partner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)