Hi everyone,
I have a power failure on my TEK 475 oscilloscope.
I worked all day along on this and i found the failure but i don't know wher does it comes from.
I checked all the power supply :
110v = ok
50v = ok
5v = ok
+15v = 0v
-15v = 0v
-8v = +0.5v
i noticed that the negatives power supplies's regulation comparators are powerd by the +15 supply. So, the failure comes from the +15.
I have a shortcut between +15v and GND and i don't know where it can come from. I've taken off all the transistors one by one and all the visibles connectors but it's always short cut with GND.
Exploring all the shematics did not help me to find a componment capable of short-cutting the GND.
Does someone has a hint about this ?
I have a power failure on my TEK 475 oscilloscope.
I worked all day along on this and i found the failure but i don't know wher does it comes from.
I checked all the power supply :
110v = ok
50v = ok
5v = ok
+15v = 0v
-15v = 0v
-8v = +0.5v
i noticed that the negatives power supplies's regulation comparators are powerd by the +15 supply. So, the failure comes from the +15.
I have a shortcut between +15v and GND and i don't know where it can come from. I've taken off all the transistors one by one and all the visibles connectors but it's always short cut with GND.
Exploring all the shematics did not help me to find a componment capable of short-cutting the GND.
Does someone has a hint about this ?