Author Topic: Tektronix 540A No Graticule or Text on Screen  (Read 331 times)

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Offline shingabiss

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  • Posts: 2
  • Country: us
Tektronix 540A No Graticule or Text on Screen
« on: July 16, 2021, 06:55:08 pm »
Scope has been re capped, board washed.  All PS voltages correct.

  • Scope does turn on, goes through the usual screen tests
    analog clock icon comes on
    Relay clicks but does not end up with graticule or any text menus on screen
    There is a trace on the screen that responds to volts/div and horiz time scale. 

Hooked up VGA monitor, same as CRT.  The dip sw is set for all zeros; right side of rocker switches depressed.  Seven segment display first diplays ".L" then segments A and F alternately blinking at about 2Hz.  Display never stops this but gets a little faster.  It seems it never finishes the boot process

Any ideas? 

Thanks.
 


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