My 577 displays the retrace problem.
I changed C581 in the 177 supply and four resistors R552, R554, R556, and R558 (all 4.3K, which measured between 4.7K and 5K), but it did not make a difference. All supply voltages including the +/-15V for the 177 are fine.
The screenshot of the problem is linked below
/g/TekScopes/album?id=77191Thanks
Fred
