Hey Dear All,
I'm new on this forum.
My name is Gyuri.
My english is crappy, please forgive it.
Just as my knowledge in electronics.
But that does not stopping me to build amplifiers, DACs etc.
Indeed I have repaired four TEK scopes.(2445, 2465, 2467B and 2440.)
Of course I have got some help from very nice people at TekScopes.
I have had four scopes, two of them from above, 2467B and 2440, and 2225 and a Velleman PCS500.
I have acquired a beautiful HP1745A now.
It is in very good cosmetical state inside and outside also.
Wonderful, that screen filter is glass, not some crappy plastic.
But I have some problems:
First, scale illumination, it is works only after a hour or so, after switching on.
It is uniform and stable otherwise.
Second, although waveforms are quite O.K., at all frequencies with stable trigger,
there is a strange problem.
I have built a Jim Williams pulse generator for fast rise signal, HP can not be able displayed of it's waveform.
If I press Beam Find button, the signal appears at the begining or ending of trace.
I don't know, where I can start.
I have checked LVPS voltages, seems O.K. to me.
Thanks for any help in advance!
Kind regards,
Gyuri
![](https://hbpeza.dm2301.livefilestore.com/y2pg3v-Fh4qKluBUVwMFBjOKiW9-tlfpiTC33MxBAU2fmYv1RjVXVwmMpEVVpIncfLTK1mftHB9i4vHj4HsYe3zFkmRBBfKZKOfz6l8MHn5nAM/HP1745A_01SMALL.JPG?psid=1)