The 256 values should match what you see in EXER 02, in which case, yes, it has all of your calibration data.
Putting the calibration data back via GPIB works on a 2465(plain), but I haven't heard of anyone trying it yet on an A or B.
Also I'd like to replace the Keeper battery at some point but I cannot find a source for it on this side of the pond. There is an LTC-7PN sold on Ebay UK (https://www.ebay.co.uk/itm/EVE-EF651625-LTC-7PN-Size-750mAh-Lithium-Battery-Cell-3-6V-PCB-Pin-232542/142821167102) under a (rather convincingly named) brand called EVE or "Energy Very Endure". Has anyone used one of them? Looks like the difference is that the casing is metal rather than plastic. The US sellers I've looked at either won't ship overseas or charge an arm and leg.
Also, the intensity knob is cracked. Do you know where I can get one without having to sell the scope to buy it?
I've got my 2445B few years ago and it was waiving like crazy. I knew there must be something wrong with the PS and I found this http://www.condoraudio.com/wp-content/uploads/Projects/Tektronix-2465B-Oscilloscope-Restoration-Repair.pdf. I recapped the power supply with the exception of the two big Sprague 290uF and the Rifa caps. Last week I ordered two 330uF Nichicon PW and the Rifa caps (well most of them, I missed two) and I opened it up to replace them. To my surprise, the Sprague ESR was better than the new Nichicon, 25mOhm Sprague and 100mOhm Nichicon so I didn't replace them. Sure enough, the Rifa caps were all micro cracked.
One relatively annoying issue that I have is that I can see a small flicker, a tiny fluctuation of the intensity. Do you know where it can come from? It has over 40K hours so I may need to recap the main board?
Also, the intensity knob is cracked. Do you know where I can get one without having to sell the scope to buy it?
I've got my 2445B few years ago and it was waiving like crazy. I knew there must be something wrong with the PS and I found this http://www.condoraudio.com/wp-content/uploads/Projects/Tektronix-2465B-Oscilloscope-Restoration-Repair.pdf. I recapped the power supply with the exception of the two big Sprague 290uF and the Rifa caps. Last week I ordered two 330uF Nichicon PW and the Rifa caps (well most of them, I missed two) and I opened it up to replace them. To my surprise, the Sprague ESR was better than the new Nichicon, 25mOhm Sprague and 100mOhm Nichicon so I didn't replace them. Sure enough, the Rifa caps were all micro cracked.
One relatively annoying issue that I have is that I can see a small flicker, a tiny fluctuation of the intensity. Do you know where it can come from? It has over 40K hours so I may need to recap the main board?
Also, the intensity knob is cracked. Do you know where I can get one without having to sell the scope to buy it?
I think the light flicker is normal and part of the design. All of my three scopes have it, one has only 800 hours of operation. Also the flickering of the LEDs on the front panel when You press buttons seems to be normal. Did not change with replacing all caps in the power supply at all.
I've got my 2445B few years ago and it was waiving like crazy. I knew there must be something wrong with the PS and I found this http://www.condoraudio.com/wp-content/uploads/Projects/Tektronix-2465B-Oscilloscope-Restoration-Repair.pdf. I recapped the power supply with the exception of the two big Sprague 290uF and the Rifa caps. Last week I ordered two 330uF Nichicon PW and the Rifa caps (well most of them, I missed two) and I opened it up to replace them. To my surprise, the Sprague ESR was better than the new Nichicon, 25mOhm Sprague and 100mOhm Nichicon so I didn't replace them. Sure enough, the Rifa caps were all micro cracked.
One relatively annoying issue that I have is that I can see a small flicker, a tiny fluctuation of the intensity. Do you know where it can come from? It has over 40K hours so I may need to recap the main board?
Also, the intensity knob is cracked. Do you know where I can get one without having to sell the scope to buy it?
I think the light flicker is normal and part of the design. All of my three scopes have it, one has only 800 hours of operation. Also the flickering of the LEDs on the front panel when You press buttons seems to be normal. Did not change with replacing all caps in the power supply at all.
Mine does that too.
Read this somehere that its common for B model (2445B & 2465B), to have that annoying whole panel's faint LEDs flickering everytimes when any button was pressed.
I've got my 2445B few years ago and it was waiving like crazy. I knew there must be something wrong with the PS and I found this http://www.condoraudio.com/wp-content/uploads/Projects/Tektronix-2465B-Oscilloscope-Restoration-Repair.pdf. I recapped the power supply with the exception of the two big Sprague 290uF and the Rifa caps. Last week I ordered two 330uF Nichicon PW and the Rifa caps (well most of them, I missed two) and I opened it up to replace them. To my surprise, the Sprague ESR was better than the new Nichicon, 25mOhm Sprague and 100mOhm Nichicon so I didn't replace them. Sure enough, the Rifa caps were all micro cracked.
One relatively annoying issue that I have is that I can see a small flicker, a tiny fluctuation of the intensity. Do you know where it can come from? It has over 40K hours so I may need to recap the main board?
Also, the intensity knob is cracked. Do you know where I can get one without having to sell the scope to buy it?
I think the light flicker is normal and part of the design. All of my three scopes have it, one has only 800 hours of operation. Also the flickering of the LEDs on the front panel when You press buttons seems to be normal. Did not change with replacing all caps in the power supply at all.
Mine does that too.
Read this somehere that its common for B model (2445B & 2465B), to have that annoying whole panel's faint LEDs flickering everytimes when any button was pressed.
I've got my 2445B few years ago and it was waiving like crazy. I knew there must be something wrong with the PS and I found this http://www.condoraudio.com/wp-content/uploads/Projects/Tektronix-2465B-Oscilloscope-Restoration-Repair.pdf. I recapped the power supply with the exception of the two big Sprague 290uF and the Rifa caps. Last week I ordered two 330uF Nichicon PW and the Rifa caps (well most of them, I missed two) and I opened it up to replace them. To my surprise, the Sprague ESR was better than the new Nichicon, 25mOhm Sprague and 100mOhm Nichicon so I didn't replace them. Sure enough, the Rifa caps were all micro cracked.
One relatively annoying issue that I have is that I can see a small flicker, a tiny fluctuation of the intensity. Do you know where it can come from? It has over 40K hours so I may need to recap the main board?
Also, the intensity knob is cracked. Do you know where I can get one without having to sell the scope to buy it?
I think the light flicker is normal and part of the design. All of my three scopes have it, one has only 800 hours of operation. Also the flickering of the LEDs on the front panel when You press buttons seems to be normal. Did not change with replacing all caps in the power supply at all.
Mine does that too.
Read this somehere that its common for B model (2445B & 2465B), to have that annoying whole panel's faint LEDs flickering everytimes when any button was pressed.Now there's a nice little challenge for you !
Is more front panel bulk capacitance needed for the LED supply rails or is it a digital glitch affecting the the switching for the LEDs ?
It is not front panel LED flicker, it is CRT flicker. Tiny but noticeable and random, not following a pattern.
One relatively annoying issue that I have is that I can see a small flicker, a tiny fluctuation of the intensity. Do you know where it can come from? It has over 40K hours so I may need to recap the main board?
I think the light flicker is normal and part of the design. All of my three scopes have it, one has only 800 hours of operation. Also the flickering of the LEDs on the front panel when You press buttons seems to be normal. Did not change with replacing all caps in the power supply at all.
Mine does that too.
Read this somehere that its common for B model (2445B & 2465B), to have that annoying whole panel's faint LEDs flickering everytimes when any button was pressed.
Now there's a nice little challenge for you !
Is more front panel bulk capacitance needed for the LED supply rails or is it a digital glitch affecting the the switching for the LEDs ?
One relatively annoying issue that I have is that I can see a small flicker, a tiny fluctuation of the intensity. Do you know where it can come from? It has over 40K hours so I may need to recap the main board?
Is the flicker still there when the readouts are turned off, i.e. the readout control in the central position? The readouts "steal" time from the main trace, and that can cause intensity variations depending on the sweep time.
Also, the intensity knob is cracked. Do you know where I can get one without having to sell the scope to buy it?You could check Qservice, they sell various Tek parts. No affiliation, just a happy customer.
One relatively annoying issue that I have is that I can see a small flicker, a tiny fluctuation of the intensity. Do you know where it can come from? It has over 40K hours so I may need to recap the main board?
Is the flicker still there when the readouts are turned off, i.e. the readout control in the central position? The readouts "steal" time from the main trace, and that can cause intensity variations depending on the sweep time.
Wow .. thanks for sharing med6753 !
PS : All your images are saved, just in case Imageshack acting up in the future, hope you don't mind.
One thing I am nervous about though - this removal of the fan/mandrel. Are there any other tips anyone can give apart from 'go gently and glue back up if you have to'? I've read elsewhere that you can also push a bit on the mandrel, after loosening the nut a little. I also wondered about making some sort of jug to apply pressure in the right place. Can anyone give me advice or reassurance here?
Thanks a lot from the UK
Jon N