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Help with an old scope
Hi, thanks for the help
The "variable horizontal gain" board is fine, q21 and 22 there have the right voltage , more or less.
Now in the other board: the base of q21 (next to q22) has 3.6v when the switch s103g connects pin 20 to pin 14
When I move the switch to the last...
Help with an old scope
Hi again.
I am trying to fix an B&K 1460 oscilloscope.
It comes on, but I only can get it to display a dot, if I connect it to the signal generator I can get it to display 2 dots separated acordingly the voltage and scale
the dot(s) are always to the left of the screen, I...
connecteur nimea
I need to find this conector's name and model so I can find and buy it
It is the power/nemea connector from a magellan nav 5000 , nav 6000
it is 5/32 in diameter with 5 connectors, screw on , not like bnc that is a quarter turn, more like a mic with several turns
Any help is...
car electronics projects
I just came from a Upick junkyard and I was wondering if thereis a forum or page where people do things with electrical car parts
There is a lot of stuff that can be bought for pennies : fan motors, windows motors all kind of pressure, vacum and temperature sensors...
I got it working!!
It seems someone already disassembled the scope once, and when he put the crt back in place it pushed the crt connector backward so nothing was realy connected to it.
Hi , I got the new schematics, a lot better than the other ones.
Disconnected the input of the horizontal amplifier. and also the input of the vertical amplifier, no difference. no dot in the center of the screen,
Then I disconected the crt from the horizontal and vertical amplifier
Also nothing...
Hi, someone sugested me to disconnect the "plates" the teory is that I should get a dot in the center of the screen. Then connect horizontal or verticl circuits to see wich one is failing.
Any suggestions?
Re: Distance Education
Try
**broken link removed**
and
**broken link removed**
http://www.freedomuniversity.tv./
All have free courses online with videos on youtube that are an hour long each
Re: Help with a Tektronics 2205 , does not dosplays anything
Thanks, the high voltage static burned my multimeter (and froze my keyboard and mouse) So I got a cheap spare multimeter and took these measurements in dc volts:
Q845 Emitter 98.5
Base 97.4
Collector 8.4
Q840 Emitter...
Re: Help with a Tektronics 2205 , does not dosplays anything
I hope with a pdf works I did a print from one page and did not worked, now I extracted that page and it is ok, sorry
Re: Help with a Tektronics 2205 , does not dosplays anything
Ok.
The filament has 6.7 volts ac ( at the connector in the main board)the manuals don't say how much it should be.
there is another pin that has -1900 v dc , the -1xxx is correct by the manual but I can't distinguish the xxx is correct
crt 154-0929-00
Ok I did that test and it does not displays anything, room completely in the dark, turned it on and of several times
BUT when when I press the beam finder a smudge lights up in the screen for a second.
Thanks, any more suggestions?
tektronics 2205
Hi, I have this scope and I downloaded the service manuals
It does not displays anything, but the power led come on and moving buttons around I can get the trigger led to blink.
When I press the beam finder nothing happen
I checked the voltages from the power supply and they are...
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