Samsung scx-4521 - "FSU"

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  • Michael
    • Aug 2025

    #1

    Samsung scx-4521 - "FSU"

    The machine is displaying the "FSU" message.
    Does anybody have an ideia of what is it?
    I still don't have the service manual.
  • just a tech
    Service Manager

    250+ Posts
    • Jan 2007
    • 332

    #2
    have not seen a "FSU" error message on display before.. have seen a "LSU" error before however, and that is laser unit problems.( most of the time either it hasn't reached proper speed in time or it's just locked up) can test by going into "engine test mode".. (menu--#--1931) by the way to get into "tech mode" you do so with (menu--#--1934)... after going into engine test mode with 1931, you will go to diagnostic no.1 and then sub-code no.1, 2, or 3.. NO.1= "LSU motor test". once in, the #1 key is "on" and the # 2 key is "off" (when doing this,the laser motor starts when the execution key is pressed and stops when the stop key is pressed.) NO.2= "LSU Hsync Test". once in the #1 key is "on" and the #2 key is "off" (when doing this, the LSU motor starts and "Laser Ready" is displayed if the motor spins at the correct speed, otherwise "Laser Error" is displayed.) NO.3= "LD TEST". once in, again #1 key is "on" and the #2 key is "off" (when doing this, "Diode On" is displayed, when the laser diode is on. Otherwise "Diode Off" is displayed.) NOW, i know this is a lot of shit to read but hopefully it helps ya out.. good luck..

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