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Old 10th November 2012, 11:24 AM   #11
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The problem is probably easy to fix--perhaps nothing more than a bad resistor or cap. But to find the culprit might not be easy, unless you're familiar with the unit or have a good hand with the service manual. As noted first look at the power supply voltages--or even better, start with a visual check (burned parts etc.).

Samuel

Last edited by Samuel Groner; 10th November 2012 at 11:27 AM.
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Old 10th November 2012, 01:03 PM   #12
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It may simply be an adjustment issue...you have the manuals from HP so systematically go through the setup adjustments.
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Old 11th November 2012, 11:16 AM   #13
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Hello Dagwood,
I had the the same issue with the HP54601 my employer bought for me shortly after I started working for the company in 1990.
The screen does not look inverted to me, just compressed.
The diplays of these scopes work with a crt, just like a monochrome TV. The TV monitor of these scopes looks like it is same OEM part from a Japanese manufacturer.
On my unit the vertical deflection was faulty. I downloaded the data sheet of the vertical chip and found a small electrolytic of 10 (or so) µF that dried out. Replaced it an all was fine.
A shame I cannot remember exactly the value or the ref (C#). It is still Sunday here in Europe.
When I get to work tomorrow I will take my lunch break to open the rear cover of the HP and take a picture of the capacitor in question. It is located on the monitor pcb, close to signal pcb and close to the front panel.
If you are not familiar with cathode ray monitors, be careful. The crt uses a voltage in the kV range. Never remove the high voltage plug from the picture tube and never touch the pcb with voltage applied.
Good luck.
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Old 11th November 2012, 05:14 PM   #14
Dagwood is offline Dagwood  New Zealand
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Hi Grommeteer

Thanks for giving up your lunch to look at this for me

I have never worked on a scope before and am very aware of the high voltages within....!
Ok, I will pop the cover off tonight and have a look ( dischage probe in hand . )

Thanks all for the advise and hope it its a simple fix
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Old 12th November 2012, 08:41 AM   #15
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Ok. let´s start digging....

The name of the cap is C608, 10µF.
Here is the picture:
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Old 13th November 2012, 05:01 PM   #16
Dagwood is offline Dagwood  New Zealand
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Hi Grommeteer

Thanks for the update, I wont get a chance to look at this until the weekend as I'm away on business, will update then

Cheers for your help with this
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Old 27th November 2012, 09:40 AM   #17
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Success?
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Old 27th November 2012, 05:24 PM   #18
Dagwood is offline Dagwood  New Zealand
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Due to a few issues at home I am not able to get to my workshop to test

But I did take the cover off on the weekend and had a quick look, nothing obvious!

I will have another look tonight at Cap 608

Cheers
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Old 19th January 2013, 10:47 AM   #19
Dagwood is offline Dagwood  New Zealand
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Hi Grommeteer

Sorry for the long delay in replying but I have been going through a messy breakup

Thanks you so much Cap 608 was dead! changed a few other while I was at it and hey presto....she works 100%

Thanks again
Dagwood
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Old 19th January 2013, 10:17 PM   #20
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Good on ya!
Isn't that what they say in your part of the world?
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