HELP! I have a Durst CLS 450 that won't turn off

Discussion in 'Enlarging' started by Eric Rose, Feb 17, 2018.

  1. Eric Rose

    Eric Rose Subscriber
    Ads Enabled

    Nov 21, 2002
    On the round side
    Multi Format
    I have a Laborator 1000 with a CLS450 head. The head is driven by the Durst TRA450 control unit. The timer is an Omega timer. I was making test strips and suddenly the light would not turn off. Even when I unplug the the timer it still stays on. The only way I can get it to turn off the enlarger light is to turn off the TRA450 unit.

    I have the schematics of the TRA450 unit and figure it might be a relay, but who knows I haven't pulled the case off yet.

    Any suggestions? Has anyone replaced the TRA450 with a newer switching power supply?

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies. If you have a Photrio account, please log in (and select 'stay logged in') to prevent recurrence of this notice.