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Thanks Michael. That's incredibly helpful. Jonathan

Hi Jonathan, I am processing a scan I made of the 650HR manual and I believe it has schematics and information on the 651HR, as well (which is the PAL version, correct?) I will double check. Hopefully

I am trying to repair one of these monitors. I cannot find a manual or schematic online. Does anyone know where I can locate a scan? Many thanks Jonathan

Or one of the tantalums will smoke (happened to me for the first time in a few years a couple of days ago).? I too just plug and go. -Dave

Yes, it is not worth doing anything until you know the power supply is rock solid. The + and - 15V switching caps are 180uf 40V, and about 50% of those I see, that are original, are bad. They

Richard, Chuck is a wonderful asset to the community.? I say he has probably forgotten more than many people know in total.? When it comes to these 24xx series, he is the man.? Glad your scope is

Good news! Thanks to a couple of prompts from Chuck, I changed the main capacitors for the ±15 volt supplies and the display is now rock steady. I've left it on the bench overnight, I'll do more

I forgot to mention that I already changed the 100?F C1972 for a new Nichicon 105? capacitor.

Thanks Chuck, I'll apologise for the photo - I've only just worked out how to upload photos to the site and the 'scope was facing into a corner.... I've added some more photos - the worst is the -15V

Thanks for advice Chuck and David thankfully neither scope was shipped…I collected..carefully. I q received a lesson in that from a shipped and atrociously packed 475A which arrived with a dented

Just plug it in and turn it on. The worst that can happen is you blow a fuse. David Sent: 30 December 2022 15:31 To: [email protected] Subject: [TekScopes2] Powering up Tek 7704A and 7603 after

If the scope went through shipping, I take it apart and shake it out... Always a good idea to remove stray parts and hardware before applying power. Next, I check the power line range switch and line

Hi group can anyone advise me on a safe procedure for powering up these scopes that have remained dormant for 3-4 years? I understand SMPS are not fond of Variacs so would a lamp limiter or

Power supply ripple can easily be measured at the power supply test DIP socket on the mother board. To get down to the ripple levels they specify, you must run a stiff ground between the chassis of

The photo is in "Richards 2465" album in Photos....

Looking at the traces - with all four channels switched on, but the first two grounded, I get noticeable hash on the 1st trace, less on the second, less on the 3rd, and almost a clean trace on the

Ripple from the HV oscillator usually goes the other way: out of the power supply onto the -15V power bus. To reduce the spikes there is a 100uf electrolytic cap (C1972) right near the power connector

This one is a plain old 2465. I do have an A version as well, that's working quite well, but the 300MHz one is my favourite. Unfortunately it's not jitter - that control makes no difference (although

Hi I just went through the calibration on a 2465A yesterday – for me a 3 Hour job on that one with all of the proper Tektronix Calibration Equipment. CAL 06 always takes some time with all of the

Hi, Not at home at the moment, but if I remember correctly, there is a "read-out jitter" adjustment somewhere in the calibration routine. Will check later, but it is somewhere in the service manual