Oki PACEMARK 4410 Maintenance Manual

Also see for Microline 4410: User guide

Contents

40496501TH Rev.1 342.1.15 Power supply circuitThis switching type power supply circuit supplies the +5 VDC, ±12 VDC and +44 VDC.Rectification andsmoothing circuit+44 V primaryswitching circuitNoise filtercircuitAlarm controlcircuitSwitchingcontrol circuitAC input monitoringcircuitRectification andregulating circuit+5 V and ±12 Vprimaty switchingcircuitRectification andsmoothing circuitPOWONRESTcircuit+44VPOWALM-PPOWOFF-PPOWDWN-P+5V+12V-12VPOWONRST-NACDOWN-PSWACINFUSEThe uses of output voltages and signals are described below.Voltage/ signal Use+5V Logic IC/ LED drive voltage+12V Logic IC drive voltage, option interface line voltage and LF motor lockingvoltage-12V Option interface line voltage+44V Printhead, SP motor, LF motor, Other motors drive voltagePOW ALM-P Out put from the power supply circuit upon detection of an abnormaltemperature rise in the power supply circuit or an overcurrent of +44V.The control unit suppresses the overcurrent by two-pass printing. If theoutput does not change, the power supply circuit shuts off all DC output.POW OFF-P Output from the main PCB upon detection of an abnormality in the print head,SP motor, LF motor, Other motor driver circuit, and shut all DC output off.AC DOWN-P Output from the power supply circuit to the main PCB upon detection of noAC input with the AC switch turned off. Then the main PCB outputs thePOWOFF-P signal to the power supply circuit to have the necessaryinformation written into EEPROM.POW DWN-P Output from the main PCB to the power supply circuit upon detection of nohost or operator access for approx. 10 min., to start the power-save mode.In this mode, the power supply circuit cuts off 44V output.POW ONRST-N Output form the power supply reset circuit to the main PCB. On receiving thePOWONRST-N signal, the main PCB prepares the main PCB RESET-Nsignal and +5VD.Figure 2.19