new monitor adjustments

[davids58]

I (finally) found a place at has them bw .25 and 2W. Any suggestions re
the wattage?

David

 

[Rod Speed]

I (finally) found a place at has them bw .25 and 2W.
Any suggestions re the wattage?

Hard to say without a circuit which hasnt been
cited as far as I noticed on a quick zoom thru.

The original would normally have said if the standard 1/4W isnt enough.

 

[kony]

I (finally) found a place at has them bw .25 and 2W. Any suggestions re
the wattage?

How much space is there for it?
If given enough space, you won't have a problem using a
resistor rated for more than necessary, but might with one
rated for too low a wattage. IOW, If a 2W fits, get it.

 

[Ken]

I (finally) found a place at has them bw .25 and 2W. Any suggestions re
the wattage?

The current is so low that a 1/2 watt will work. No need to use
anything larger unless that is all you have. The ones you are replacing
might even be 1/4 watt?

 

[davids58]

A picture of what's suggested can be seen in step 4 on the following
page:
http://www.hutzelman.com/web/pages/hardware/Mods/SonyCRT/

David

 

[davids58]

I just realized that there's contact info at the bottom of the page so
I've asked the author what he used. The direct approach, who'd have
thought of that!

David

 

[davids58]

from the page author:

"I believe I used a 1/4 watt, it was a small resistor like the ones
currently on the board."

David

 

[Rod Speed]

A picture of what's suggested can be seen in step 4 on the following page:
http://www.hutzelman.com/web/pages/hardware/Mods/SonyCRT/

Thats a standard 1/4W

 

[davids58]

So, I installed a 5.1 MOhm 1/4W resistor and now the monitor's too dark
(hope I don't sound too picky but I really am going from one extreme to
another). I don't seem to be able to find any brightness adjustment.

Does anyone know whether there's a way to adjust the brightness short
of installing another resistor?

Thanks for everyone's help on this.

David

 

[Ken]

So, I installed a 5.1 MOhm 1/4W resistor and now the monitor's too dark
(hope I don't sound too picky but I really am going from one extreme to
another). I don't seem to be able to find any brightness adjustment.

Does anyone know whether there's a way to adjust the brightness short
of installing another resistor?

Thanks for everyone's help on this.

David

If I recall correctly the resistor is part of a bias circuit for the
transistor that controls the screen voltage. You will need to add to
the resistance to find the value that sets the bias properly. Should
you choose not to mess with this resistor modification, the detailed
adjustment via the software mentioned and the modified adapter will do
the same thing.

Since the resistor is a lot easier, I would tack on a 1 Meg resistor to
the one you have already installed to up the resistance and see if it is
what you need. If not, raise it by more.

 

[Rod Speed]

So, I installed a 5.1 MOhm 1/4W resistor and now the
monitor's too dark (hope I don't sound too picky but I
really am going from one extreme to another). I don't
seem to be able to find any brightness adjustment.

Does anyone know whether there's a way to adjust
the brightness short of installing another resistor?

Nope, that's the reason the cited article goes on about trying different values.