Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

BK2120b oscilloscope with horizontal problem

Status
Not open for further replies.
M

Monolith

Junior Member level 1
Joined
Sep 21, 2009
Messages
16
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Location
Switzerland
Activity points
1,415
I need help defining the source of the problem with the horizontal control of the CRT.

The traces are reduced to the left halve of the screen.
Everything else works.

On the CRT - X control I get 10 to 155V (should be about 140V max)
On the CRT +X control the voltage goes only to 3.3V, is that normal?

Monolith222
 

No help?

Nobody willing?

Nobody capable?

Anyway, I got a step further, when I tweak the last transistor base, the horizontal adjustment works. So the problem is further back.

If somebody were interested in helping, I would go through the considerable effort to get the schematic scanned and posted here.

Monolith
 

Hello,

I had similar problem with my scope and a broken resistor on driver stage.

Have a look here:



The instrument isn't the same but maybe it usefull...
 

Monolith said:
...I would go through the considerable effort to get the schematic scanned and posted here.Monolith
Click to expand...
Hi,
pls do it!
K.
 

rack and karesz,

thanks for the replies.[/img]

Here are the first schematics. I will add more as soon as they are done.

Monolith
 

Hi,
let us some transistor voltages knowed pls, especially B-E differencies...
Btw; are all the supplys at the end stage feedings/connectings OK?
K.
 

karesz,

thanks for the reply.

I will make some space and open up the oscilloscope again. I had made some temporary fix, but it got worse again after a few hours of use.

In a few days more info will be posted.

thanks

Monolith
 

Ok, we will wait for you...
What did yoe maked pls?
K.
 

hey guy somebody can help me whit a oscilloscope BKprecision 1590A y boutg it whit out power suply, and i´m worry becouse i´m looking for info but i don found any ting.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top