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FW: HP 141T NO TRACE AFTER POWER UP

 

From: vk5hl@... <vk5hl@...>
Sent: Thursday, 5 September 2024 9:02 PM
To: '[email protected]' <[email protected]>
Subject: HP 141T NO TRACE AFTER POWER UP

?

Hello All

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I have a hp 141t when it is powered up there is no trace but when I turn off the power the trace briefly appears in top right corner.

Is it the blanking circuit or do I need to do an trace? alignment or something else. I need some guidance

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Has anyone encountered this problem before and let me know what you did.

?

?

73's Leroy de VK5HL

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What happens when you press find beam???
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-Frank
 

Checked the deflection plate voltages?
 

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Leroy,

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The first thing I would do is check to see that all of the basic supply voltages are in spec.? Also check to see that the base line clipper is fully CCW.? I would put in the calibrator signal into the RF input and tune to about 30MHz.? Let us know what happens.

?

Mike

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From: [email protected] <[email protected]> On Behalf Of VK5HL
Sent: Friday, September 6, 2024 11:23 AM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] FW: HP 141T NO TRACE AFTER POWER UP

?

?

?

From: vk5hl@... <vk5hl@...>
Sent: Thursday, 5 September 2024 9:02 PM
To: '[email protected]' <[email protected]>
Subject: HP 141T NO TRACE AFTER POWER UP

?

Hello All

?

I have a hp 141t when it is powered up there is no trace but when I turn off the power the trace briefly appears in top right corner.

Is it the blanking circuit or do I need to do an trace? alignment or something else. I need some guidance

?

Has anyone encountered this problem before and let me know what you did.

?

?

73's Leroy de VK5HL

?
 

Leroy,
?
It would be helpful to get some information to help you.? Is this symptom occurring with the plug-in installed or without?? Do you see the trace when depress the beam finder???
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If you still have the plug-in installed (whether that be an SA or oscilloscope), I would remove it.? Confirm that the 141T is good.? Check your LV and HV voltage rails - make sure they are inspect.? You'll have to confirm all that first anyway before troubleshooting the blanking circuit.
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Let us know what you find.
?
-Frank

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