Tek 2755Ap: missing +9V

[Martin.M]

hello friends and happy easter,

I have the following problem:

Tektronix Spec: 2755Ap

missing +9V

I have not found application or manual.
There is a rest voltage around +1,2V, so it may be possible anywhere is a LM317 with a bad 240 ohms to ground: the only logical answer to this voltage.
But I don´t want to make shitty work here, this is a wonderful instrument. So please dear insiders, where I have to look for this problem?
It`s a ESD home, so I don`t like unscrew too much parts.

thank you for a tip and greetings from germany
Martin

[Testtech]

Check the fuses under the little cover on top of the PSU.

[shakalnokturn]

You'll find at least the 494 schematic on KO4BB's website (think of donating once in a while, all the traffic and site maintenance cost him).
On these SA's à lot of tantalum capacitor problems with age.

[KE5FX]

All of the 275x models are rack-mount versions of one 49x model or another. The 2755AP is a repackaged 492BP if I recall correctly.  Basically a 494AP with 100 Hz minimum resolution rather than 10 Hz. 

 I'd probably use the 494AP manuals from ko4bb.com to troubleshoot it; the 494 manuals may be a little too old.

[Martin.M]

Check the fuses under the little cover on top of the PSU.

thank you. 2A was blown.
LM317 at front board was defect, also the driver transistor for ON/OFF the light.