Thank you Wilson!
For the detailed description of what had to come off and how to accomplish it.
The additional information on how many of which IC sockets need to be replaced, and your source for them completes the 577 IC changing document.
Your 577 information will be in the Tekscopes message archive for many years to come, and will help many 577 owners.
Thanks again!
tom jobe...
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On 4/12/2019 2:23 PM, wilson2115@... wrote:
To remove to mainboard
Remove the pulse, step family, step rate, step offset, zero and aid, display and filter buttons by grabbing the sides and carefully pull while rocking left and right. Some buttons can be removed easier than others and unfortunately some buttons will break unfortunately so be patient and careful. I found what broke on my buttons is the clips which grip the black rods to help hold them in place, though they can still go back in and work they are loose and can come out. On the step offset amplitude knob 2 little grub hex screws need to be removed with a 1.5mm allen wrench which worked for me. The step button in the middle of the step knob is secured by a tiny 0.9mm grub screw by the switch the button connects to, just loosen and the step button should slide out with the rod. To remove the horizontal volts division it is the same as the step knob. When you have both knobs off you will need to remove the bushings which you will see a 1/2 nut for both knobs, use a wrench to loosen. When they are loose you will need to find a way to grab the nut on the rear side of the panel. Remove the 2 little bolts holding the 2 transistors in place, you will first need to loosen with a wrench and then note the little insulator pad as not to forget it when reinstalling the screws as well as the insulator pads the transistors are fastened to on the frame. You will need to note the position of all the trim knobs and cables before reinstalling. Once you have the 4 little screws on the board out and the 2 little bolts on the 2 transistors removed and the bushings and buttons removed, grab the board from the back and pull out carefully, it should slide out. Note there are 2 nuts and lock washers that will fall out when you remove the board so be careful not to loose them. When the board is removed note the plastic rods attached at the end of the switches. I used a precision flat head screw driver and carefully pried the 2 ends pulling out and it should slip off. It might be difficult as my case with some plastic rods but I manged to remove them without breaking them.
I had some help with the Artek manuals, you can purchase manuals from their website if you need a manual, I needed the service manual.
