Recently I got another HP scope. This time an HP1740A. This was on it's way to the dump at my school. The sides were unscrewed and put beside the scope so obviously someone tried to repair it. It is very similar to the 1741A storage oscilloscope. The 1740A is a dual channel 100MHz analog oscilloscope with delayed time base and 1mV/div maximum sensitivity (5mV/div full bandwidth).
This is basically how it arrived. It would blow the fuse when turned on.
After a bit of searching I found two rectifiers shorted. This seems to be a common problem in these scopes.
Then I found two burned resistors on the Z axis board.
Looks like the ceramic capacitor went short circuit and caused the two resistors to blow.
Replacing the resistors allowed the Z axis amplifier to unblank the beam and suddenly a trace appeared.
The time/div switch shaft was also worn. Looks like this scope had a lot of use.
Contacts of the time/div switch are still in great shape but the center hole where the shaft goes trough
is worn so that the contacts on the switch are misaligned with the contacts on the PCB.
This caused severe timing errors in the horizontal time base.