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display tilt adjustment hp8591a

Yves Tardif All Messages By This Member #151005 开云体育 Hi, ? I repaired an 8591A for a friend, but the display on his screen isn't perfectly straight. I'm guessing there's an adjustment for that, but where is that adjustment? There are adjustments on the top for intensity, frequency, green gain, and horz. Coarse focus on the back, and focus on the side. I haven't attempted to remove the display yet. ? Yves
Cubdriver All Messages By This Member #151006 Yves -? I suspect that's likely a magnetically deflected display, like a television, and has a deflection yoke on the CRT neck that's somehow managed to get rotated slightly. -Pat ? toggle quoted message Show quoted text > ------ Original Message ------ > From: yves_tardif@... > To: [email protected] > Sent: Friday, March 21st 2025, 06:03 PM > Subject: [HP-Agilent-Keysight-equipment] display tilt adjustment hp8591a ? Hi, ? I repaired an 8591A for a friend, but the display on his screen isn't perfectly straight. I'm guessing there's an adjustment for that, but where is that adjustment? There are adjustments on the top for intensity, frequency, green gain, and horz. Coarse focus on the back, and focus on the side. I haven't attempted to remove the display yet. ? Yves
Yves Tardif All Messages By This Member #151007 开云体育 Pat, ? I had thought about that too, but when I received it, the curve was reversed on the other side with an even larger angle. Then after a power cycle, the screen looked like what the image shows and nothing has moved since…but I had moved the instrument. I tried to shake the instrument a little, but nothing moves, I had thought then of a possible intermittent adjustment. But you are probably right, I will have no choice but to remove everything and try to find a way to make the adjustment when the device is powered on. ? Thank you for replying. Yves ? De?: [email protected] <[email protected]> De la part de Cubdriver via groups.io 贰苍惫辞测é?: 21 mars 2025 18:33 ??: [email protected] Objet?: Re: [HP-Agilent-Keysight-equipment] display tilt adjustment hp8591a ? Yves -? I suspect that's likely a magnetically deflected display, like a television, and has a deflection yoke on the CRT neck that's somehow managed to get rotated slightly. -Pat ?
Wilko Bulte All Messages By This Member #151009 You do not per chance have a steel workbench or similar? As I have found out the hard way ages ago (i.e. during my education) such an environment can affect tube trace alignment. Rotating the monitor on the desk made the picture change. Had me puzzled for quite a while, even more so because in my case it was a colour CRT. Wilko
Yves Tardif All Messages By This Member #151010 Hi Wilko, You are right, CRT screens are sensitive to the environment; steel, magnetic field of other devices if they are nearby, gravity...but I found the cause. When I noticed the display problem, I was working on the RF sections and was concentrating on them. I think I wasn't paying enough attention. What I thought was a tilt reversal was perhaps the orientation of the spectrum, as I regularly changed the instrument's orientation for testing. Why I say this is that I disassembled everything and placed the display on the table. The deflection coils were very stable and glued; they couldn't move. So, I think I made an observation error regarding the tilt reversal. I took the measurement with a ruler, and the display was straight. The metal casing covering this section had been removed before this measurement, and I demagnetized it, along with all the circuits, before reassembling. But when I disassembled it, I noticed that this section had already been disassembled and unfortunately reassembled incorrectly, and the case covering the CRT was misaligned, as was the outer frame for the display, which wasn't properly seated. I corrected everything, and now my screen is straight. The positioning of the metal case and the outer frame caused the tilt. The metal case containing the display was screwed tightly on the left side, but barely on the right side. Therefore, the right side was slightly raised above the aluminum frame, causing the tilt. Yves toggle quoted message Show quoted text -----Message d'origine----- De?: [email protected] <[email protected]> De la part de Wilko Bulte via groups.io 贰苍惫辞测é?: 22 mars 2025 03:39 ??: [email protected] Objet?: Re: [HP-Agilent-Keysight-equipment] display tilt adjustment hp8591a You do not per chance have a steel workbench or similar? As I have found out the hard way ages ago (i.e. during my education) such an environment can affect tube trace alignment. Rotating the monitor on the desk made the picture change. Had me puzzled for quite a while, even more so because in my case it was a colour CRT. Wilko
Dave_G0WBX All Messages By This Member #151026 开云体育 I have an HP8714 VNA here, that we used to cart around the country servicing power amps.?? After one visit to a MRI place, the entire display was at 45' tilt! Eventually we degaussed the case (well, the entire instrument!) using a Helmholtz coil, a 24V 5A transformer and a Variac! "Normal" (non tilted) service was restored! Some years later, the source module went intermittent, an OC somewhere in the signal path.?? I got it for free as a result.? Sometimes it fixes itself.? I need to find or make an extender for that module. "One Day"... Dave 'KBV.

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