Hello,
I have "only" problem with low voltage power supply, the crt circuit seems to be ok.
Juri
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--- In TekScopes@..., "fred" <fredschneider@...> wrote:
The 535A has a different HV supply a the 545B. I have both, ( non working). My HV transformer from the 545B is dead too but i have not repaired it because I now have a 547. If you look in the archives there is a discussion I tarted about this and Albert and I did some comparing meaurements. So probably you find there what you are looking for. On my site I have published it too, but the server is down ( and my friend who's server this is, is on holyday, so I am afraid this will take some time)
The 535A has a wax impregnated transformer, the 547 a epoxy dipped one. Many repacement transformers that are kept in colder and moisture places are bad.
My 545B had no problem. When i got it I irst used it while it was 30 degrees Celcius. No poblem. Used it some time without poblems but because of the space it moved to the garage and stayed there during winter. When i took it out I could use it about an hour max beore the transformer saturated.
Fred
--- In TekScopes@..., "yurighisio" <yurighisio@> wrote:
Hello,
Recently I received a new power transformer for my 545B, the old one was died under my eyes during troubleshooting. I have substituted the transformer and power up unit slowly with variac, the primary current seems to be ok is about 2.4A @ 230Vac about 550VA but some regulated ( 350V and 500V) supply was bad. I have recheck electrolitic capacitors seems to be ok. I have notice that there is some resistors after rectifier (R760, R730, R700, R670, R640 and R802 on H.V. supply), Have anyone the voltage drop accross this resistor of a working unit in order to know power absorption?
I also have a working 535A, the power supply is very similar, I can measure the voltage drop of resistore mentioned above in this unit to get an idea or the current consumption is more different??
Juri
