[Solved]Tek 2465A -8V -5V too low

[Galen]

I got a Tek 2465A, no trace. Sometimes, trace appear, but always 1 line, even I input signal.
As first attempt, I measured J119 voltage, found the +10V is right to the point, and most others are also within limit, except the -8V and -5V, I got -4.7V and -2.9V respectively. As per the SM, should fix the -8V problem first. I checked the -13.1V (before regulated to -8V), it's -8.7V only.

Anybody in this forum, has the experience to fix this problem, your advice is very appreciated. Thanks a lot in advance.

Galen

[tggzzz]

You'll find the answer here: https://www.eevblog.com/forum/testgear/tek-2465a-8v-5v-too-low-216364/msg2761430/#msg2761430 or here: https://www.eevblog.com/forum/repair/tektronix-2465a-repair-almost/msg2761440/#msg2761440

Or use the search box at the top right.

[Galen]

dear tggzz, thank you very much.  Calin in that post only say 3 caps were replaced, but not say which cap. Hope Calin can provide advice. 
Anyway, thanks again.

Galen

[tggzzz]

dear tggzz, thank you very much.  Calin in that post only say 3 caps were replaced, but not say which cap. Hope Calin can provide advice. 
Anyway, thanks again.

Galen

There is a lot of information available on this forum (use the search facility) and elsewhere.

There's no point in us wasting our lives repeating it - poorly.

[med6753]

If you are going to pull the Inverter/Regulator boards to perform the repair you might as well perform an entire re-cap of the supply at the same time. You'll find guidance here:

https://www.eevblog.com/forum/testgear/tektronix-2465b-oscilloscope-teardown/msg1658102/#msg1658102

[Galen]

Fixed it long time ago. just close this topic.
A rectifier diode, of the -13V, is bad. Used a multimeter measure it, can not find it's bad. After replace it, the -13V is right, then -8V also right. Scope fixed.

[tggzzz]

Fixed it long time ago. just close this topic.
A rectifier diode, of the -13V, is bad. Used a multimeter measure it, can not find it's bad. After replace it, the -13V is right, then -8V also right. Scope fixed.

Providing the solution is a courtesy to those that helped, and helpful to those that read the thread later.

That is aided if the OP adds "[Solved] " to the beginning of thread title.

[Galen]

Thanks tggzzz, added the [Solved]. I'm happy if it can help anybody.

[Galen]

If you are going to pull the Inverter/Regulator boards to perform the repair you might as well perform an entire re-cap of the supply at the same time. You'll find guidance here:

https://www.eevblog.com/forum/testgear/tektronix-2465b-oscilloscope-teardown/msg1658102/#msg1658102

Thanks med6753, yes, already recapped it in the repair.