Page: 37Service Guide ML520/521Chapter 2 Principles of Operation2.1.07 Alarm CircuitDriver Circuit Alarm ProcessingThe printhead driver output and the head gap magnet output drive signals are monitored at R29 and C8.The POWER OFF-P signal is output by the comparator (Location 02C: IC2901) when driven for more thanthe specified time. This signal becomes the ALM signal. The ALM signal is sent to the power supply boardand causes the DC voltages to be turned off.Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA BusinessPartner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
