Hi,
trying to fix the horizontal deflection of a Tek1240, I stumbled across a diode CR452 in the horizontal deflection path on board A06. Tek SM describes the diode as
SEMICOND DVC,DI:RECT,SI 1000V,3.0A,A399A
with manufacturer Motorola and Mfr. Part No. being SR3681K. The same diode is used for CR360, see schematics.
The board shows Motorola diodes with code 1520 and maybe datecode 789.
However I did not find a reference to that part number in the Motorola databook Q3/88 or "the internet".
Suggestions for a replacement type? I suspect this diode being bad (unconfirmed yet) as on TP452 I observe spikes below GND potential on the falling edge of the flyback pulse.