开云体育

E4421B Display Pfroblem

geoffrey pike All Messages By This Member #146011 Am i to believe that there are no schematics available for the ESG signal generators or are they available from some source unknown to me, cheers Geoff GI0GDP
Tom B All Messages By This Member #146013 Hi Geoff, What is the problem with the display? You can get schematics from milan.vasic@... Tom N3AJA toggle quoted message Show quoted text On 8/7/2024 12:56 PM, geoffrey pike via groups.io wrote: Am i to believe that there are no schematics available for the ESG signal generators or are they available from some source unknown to me, cheers Geoff GI0GDP
Mark Bielman All Messages By This Member #146014 开云体育 I have the schematics but nothing about the display itself. The controller stuff is on the motherboard: There's also the backlight display driver there. Mark KJ7CYN toggle quoted message Show quoted text From: [email protected] <[email protected]> on behalf of Tom B <tbryan@...> Sent: Wednesday, August 7, 2024 2:26 PM To: [email protected] <[email protected]> Subject: Re: [HP-Agilent-Keysight-equipment] E4421B Display Pfroblem ? Hi Geoff, What is the problem with the display? You can get schematics from milan.vasic@... Tom N3AJA On 8/7/2024 12:56 PM, geoffrey pike via groups.io wrote: > Am i to believe that there are no schematics available for the ESG > signal generators or are they available from some > source unknown to me, > cheers > Geoff > GI0GDP >
geoffrey pike All Messages By This Member #146028 Hi Tom, The display problem is that the front panel controls don't work and obviously you can't see anything! The back light seems OK, early days as i haven't opened it up yet to look but i always like to have CLIP data Thanks for the drawing Mark cheers Geoff GI0GDP
Tom B All Messages By This Member #146030 开云体育 Hi Geoff, If there is no change when you adjust the contrast controls, then the problem is likely the contrast circuit.? There is a test point for that on the bottom of the circuit board.?? The voltage should change when you adjust the contrast controls. Also, check where the ribbon cable from the display plugs in.? Make sure it is seated correctly. Tom On 8/8/2024 12:40 PM, geoffrey pike via groups.io wrote: toggle quoted message Show quoted text Hi Tom, The display problem is that the front panel controls don't work and obviously you can't see anything! The back light seems OK, early days as i haven't opened it up yet to look but i always like to have CLIP data Thanks for the drawing Mark cheers Geoff GI0GDP
Mark Bielman All Messages By This Member #146036 开云体育 Looks to me like it's on the top. TP602 by U614 and L603 toggle quoted message Show quoted text From: [email protected] <[email protected]> on behalf of Tom B <tbryan@...> Sent: Thursday, August 8, 2024 11:26 AM To: [email protected] <[email protected]> Subject: Re: [HP-Agilent-Keysight-equipment] E4421B Display Pfroblem ? Hi Geoff, If there is no change when you adjust the contrast controls, then the problem is likely the contrast circuit.? There is a test point for that on the bottom of the circuit board.?? The voltage should change when you adjust the contrast controls. Also, check where the ribbon cable from the display plugs in.? Make sure it is seated correctly. Tom On 8/8/2024 12:40 PM, geoffrey pike via groups.io wrote: Hi Tom, The display problem is that the front panel controls don't work and obviously you can't see anything! The back light seems OK, early days as i haven't opened it up yet to look but i always like to have CLIP data Thanks for the drawing Mark cheers Geoff GI0GDP

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