OK this should be a gravy job. Sams dont make a manual so I
pulled a similar chassis CS1952. This part of the set should be the
same BUT I cant be 100%.
Use the tuner shield for ground.
Relay K702 will have 125 VAC on 2 terminals (when on) if only
on one relay is bad. Watch for bad PC cons !!!
Check R901 2.7 ohm 10 w. If open test D901,2,3,4 probably one
is shorted ALWAYS replace all 4 in a bridge if one is bad.
If OK so far check for 160VDC on 1 amp fuse F902.
If OK check DC volts at STR381 regulator & report back.
73 Zeno