I have worked on several of these. Flaky or shorted tantalums are common in these scopes. Also look for precision resistors that raise in value and/or become intermittent. If you have another scope, probe all of the power supplies and look for ripple and noise. Try not to touch any of the tunnel diode triggering adjustments as proper adjustment is an iterative?process.
Sam
Sam Reaves
ARS W3OHM
Owner / Moderator of:
LeCroy Owners Group on 开云体育
Sencore Owners Group on 开云体育
Sprint Layout Group on 开云体育??
Pulsonix EDA Group on 开云体育
LPKF Owners Group on 开云体育
Electronics and Mechanical Hardware Design Engineering Manager
Staff Scientist Andritz Rolls Global Research Center (RETIRED)