Is this scope defective? See pics

K-amps · 12th March 2005, 12:44 AM

Guys/ Mark,

I just got the Tek 7633 Storage Oscilloscope. POwering up it displays a squiggly line with no probes hooked up.

Even after hooking up the probes, the lines stay even if I ground the probes. The modules work fine with my 7904 scope... could it be the seller sold me a bad 7633?

K-amps · 12th March 2005, 12:45 AM

Second pic.

tenderland · 12th March 2005, 01:22 AM

Looks like no deflection. Beam parked in middle of screen. The smear is interesting .

K-amps · 12th March 2005, 01:27 AM

English please....

Is this a calibration issue or is the unit defective?

More info: The squiggly lines stay as is even after removing all plug-in modules...

tenderland · 12th March 2005, 01:28 AM

Does the beam move across the screen at all ?

K-amps · 12th March 2005, 01:29 AM

Just stays there and fluctuates.... flickers....

tenderland · 12th March 2005, 01:35 AM

Deflection circuits pull the beam from left to right (horizontal deflection) . GENERALY when the beam is stuck there is no deflection.
there usualy is a beam finder button you push and it will just display the beam with no deflection . I dont think it is a calibration issue >.

K-amps · 12th March 2005, 02:11 AM

So basically the delfection circuit is bad. Becuase I pressed all buttons, on one, it narrows a little but is still flickering all over.

tenderland · 12th March 2005, 02:21 AM

try cleaning the horizontal and vertical rotary switches .

horizontal has the time base ms
vertical has the voltage

Mark A. Gulbrandsen · 12th March 2005, 02:21 AM

Are these modules form your 7904? If these came with the scope then the sweep module may be bad. You can take one of the sweep midules from your 7904 and use it in this scope to see. The good thing is that the on screen readout is working and thats a sign that the deflection circuits are working....were they not then there would be no readout...... I suspect the mainframe is good and the sweep midule(on the right) is bad. How do you have the controls set...... both on the mainframe and on the sweep module?

Mark

12th March 2005, 01:22 AM	#3
tenderland diyAudio Member Join Date: Jul 2004 Location: us	scope Looks like no deflection. Beam parked in middle of screen. The smear is interesting .

12th March 2005, 01:28 AM	#5
tenderland diyAudio Member Join Date: Jul 2004 Location: us	line Does the beam move across the screen at all ?

12th March 2005, 01:35 AM	#7
tenderland diyAudio Member Join Date: Jul 2004 Location: us	deflection Deflection circuits pull the beam from left to right (horizontal deflection) . GENERALY when the beam is stuck there is no deflection. there usualy is a beam finder button you push and it will just display the beam with no deflection . I dont think it is a calibration issue >.

12th March 2005, 02:21 AM	#9
tenderland diyAudio Member Join Date: Jul 2004 Location: us	long shot try cleaning the horizontal and vertical rotary switches . horizontal has the time base ms vertical has the voltage

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12th March 2005, 01:27 AM	#4
K-amps diyAudio Member Join Date: Nov 2003 Location: Indiana	English please.... Is this a calibration issue or is the unit defective? More info: The squiggly lines stay as is even after removing all plug-in modules...

12th March 2005, 01:29 AM	#6
K-amps diyAudio Member Join Date: Nov 2003 Location: Indiana	Just stays there and fluctuates.... flickers....

12th March 2005, 02:11 AM	#8
K-amps diyAudio Member Join Date: Nov 2003 Location: Indiana	So basically the delfection circuit is bad. Becuase I pressed all buttons, on one, it narrows a little but is still flickering all over.

12th March 2005, 02:21 AM	#10
Mark A. Gulbrandsen diyAudio Member Join Date: Sep 2001 Location: Salt Lake City	Are these modules form your 7904? If these came with the scope then the sweep module may be bad. You can take one of the sweep midules from your 7904 and use it in this scope to see. The good thing is that the on screen readout is working and thats a sign that the deflection circuits are working....were they not then there would be no readout...... I suspect the mainframe is good and the sweep midule(on the right) is bad. How do you have the controls set...... both on the mainframe and on the sweep module? Mark

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