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Re: Tek 2236 scope repair
The 2200 series have problems with the rectifier diodes going bad on the secondaries. Use something like 1N4937 diodes as replacements. A very fast or higher speed is necessary as replacements. The electrolytics in the supply should be replaced with low ESR types such as Nichicon ULD, UHE or UCY. Increasing the capacitance is fine, i.e. 270/330mfd for a 220mfd. Mount the new condensers above the board to allow air flow under them. The main condenser from the mains can be a Nichicon LGR type. The tantalums in the supply can be replaced with film types. The tantalums would be ones like 4,7mfd. Replace the RIFAs! Use something like X1 or X2 and Y1 or Y2 types. Remove the label and rubber top to oil the fan while in the supply. Tom Lee is right about checking other condensers.
Mark |
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Re: Extender Cables for TM500/5000 series - Alternatives?
Yeah, that is another possibility.
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Thanks, Mac. Jim ------ Original Message ------
From "Mac Perkins" <macp@...> To [email protected] Date 2/9/2024 5:04:18 PM Subject Re: [TekScopes] Extender Cables for TM500/5000 series - Alternatives? The TM515 power supply assembly, which includes the backplane with the connectors for the modules, can be easily removed from the frame by removing the obvious screws on the rear panel. |
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Re: Extender Cables for TM500/5000 series - Alternatives?
Yes, the opportunities for creativity are endless! Thanks for the ideas, Dave!
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Jim ------ Original Message ------
From "Dave Daniel" <kc0wjn@...> To [email protected] Date 2/9/2024 5:36:09 PM Subject Re: [TekScopes] Extender Cables for TM500/5000 series - Alternatives? Well, perhaps you can disguise them as picture frames for your wife's favorite pets or flowers or something when they're not in use in the lab. You could even put LEDs in to light the photos. Or use them as digital clocks with a special plug-in desigbed by you. Fun, fun, fun. :) |
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Re: Extender Cables for TM500/5000 series - Alternatives?
I just saw some TM-5xx rigid extenders on ebay for $60. Item # 223811718800 .
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DaveD On Feb 9, 2024, at 18:04, Mac Perkins <macp@...> wrote: |
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Re: Extender Cables for TM500/5000 series - Alternatives?
Well, perhaps you can disguise them as picture frames for your wife's favorite pets or flowers or something when they're not in use in the lab. You could even put LEDs in to light the photos. Or use them as digital clocks with a special plug-in desigbed by you. Fun, fun, fun. :)
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DaveD On Feb 9, 2024, at 17:50, Jim Ford <james.ford@...> wrote: |
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Re: Extender Cables for TM500/5000 series - Alternatives?
The TM515 power supply assembly, which includes the backplane with the connectors for the modules, can be easily removed from the frame by removing the obvious screws on the rear panel.
With a few small blocks to line everything up, the module to test can just plug in directly. Great care must be taken when testing not to move the module and inadvertently disconnect it. Not as good as having proper extender cables, but works in a pinch. -Mac |
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Re: Tek 2236 scope repair
Increasing the intensity increases HV PS drain, which is causing the HV to sag. Reduced HV expands the trace.
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So, yup, you've got PS troubles. Look first at the usual suspects (e.g., bad bypass caps -- tants especially), then move from there. --Tom -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 420 Via Palou Mall Stanford University Stanford, CA 94305-4070 On 2/9/2024 2:49 PM, Board via groups.io wrote:
Also, when the scope powers on, the horizontal trace doesn't go all the way to the end. Increasing the intensity causes the trace to expand on the screen, which shouldn't happen. The trace goes from being smaller than the CRT to extending past the edges of the CRT when the intensity is increased. |
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Re: Extender Cables for TM500/5000 series - Alternatives?
Ah, a TM501 and a TM502, in addition to a larger one to hold multiple plug-ins.? The wife is going to LOVE that idea!? Thanks for the inspiration, Dave!? LOL!? ? ? ? ?Jim?Sent from my T-Mobile 4G LTE Device
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-------- Original message --------From: Dave Daniel <kc0wjn@...> Date: 2/9/24 11:53 AM (GMT-08:00) To: [email protected] Subject: Re: [TekScopes] Extender Cables for TM500/5000 series - Alternatives? You'd probably want to use the smallest TM module in which? the plug-in will fit. That way one can get to three sides of the plug-on. I have a TM-501 dedicated for troubleshooting single-bay plug-ins. I'd want a two-bay module if I needed to troubleshoot a double-wide plug-in.DaveD> On Feb 9, 2024, at 14:36, Jim Ford <james.ford@...> wrote:> > ?Hmmmm.... The "remove the sides" trick probably won't work on a TM515 portable like mine, though.? Darn, I guess that means I'll have to scout for a TM506 or TM5006 or a smaller TM50X mainframe.? Not that I'm in a hurry to give up the portable, mind you!?????? Jim Ford Sent from my T-Mobile 4G LTE Device> -------- Original message --------From: Dave Daniel <kc0wjn@...> Date: 2/9/24? 7:45 AM? (GMT-08:00) To: [email protected] Subject: Re: [TekScopes] Extender Cables for TM500/5000 series - Alternatives? A couple of things come to mind.First, the question about where to find extension cables for Tektronix 7000 series scopes and TM-500/5000 power frames has come up many times in the past. I'd suggest that you check the message archives. Over the years, several list members have offered kits for building extension cables. I don't know if anyone is doing that at present.Second, the kits typically consist of a PCB for each end of the cable as well as pre-cut wires. The cable assembly is much more than just a cable, so the kits or pre-built cable assemblies, if one can find them, are more expensive than just a cable. Also, original extenders from Tektronix used to show up on ebay every once in awhile. Their rarity makes those expensive as well.It has been suggested that some troubleshooting can be done by just removing the side and bottom panels of a single-bay or two-bay power frame? in order to get (limited) access to a plug-in's board(s) without using an extender.DaveD > On Feb 9, 2024, at 10:19, Frank Mashockie <fmashockie@...> wrote:> > ?Hi y'all!? I'm currently working on repairing a CG5011 calibrator generator.? It has a very strange fault symptom affecting the DC frequency modes.? Almost looks like when in + or - DC mode, the signal is being blocked by a coupling capacitor.? It looks very similar to when you look at signals being AC coupled on your scope.? The signal will attempt to reach the DC Volt/div setpoint, and then collapse to ground.? It will do this for all the lower voltage ranges until I get to higher voltages (10V or greater).? So very strange!? > > I've tried checking the numerous troubleshooting trees in the CG5011 manual and it looks like I will have to take a closer look at some of the boards.? I'll need to remove them from TM5003 to do this, but I don't have any extender cables.? I was looking on eBay to see if any were available and I saw some listed for ~$100 each!? That is ridiculous for a cable.? Has anyone come up with alternative or DIY way to connect these boards out of TM5000?? Something that would be much cheaper?> > Any help would be greatly appreciated!? Thanks!> > -Frank> > P.S. Links to vids on my YT channel documenting this repair:> > Part 1 - First impressions/fixing the current loop - > Part 2 - Replacing the broken variable encoder/first example of DC mode issue - > Part 3 - troubleshooting the DC freq mode fault > > > > >> > > >
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Tek 2236 scope repair
Hi,
I found a Tek 2236 scope in the garbage. After running it for a few minutes, the power supply failed. Powering the scope from a 42 volt supply caused the NPN transistors to fail. I replaced the transistors with the MJE15030 (the hFe was measured to be 40 for both transistors). The scope powers on, but when the transistors get hot the power supply stops oscillating and the scope shuts down. Any ideas as to what could be happening here? Also, when the scope powers on, the horizontal trace doesn't go all the way to the end. Increasing the intensity causes the trace to expand on the screen, which shouldn't happen. The trace goes from being smaller than the CRT to extending past the edges of the CRT when the intensity is increased. The scope is from 1984 and the serial number is for the earliest revision. |
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Re: Extender Cables for TM500/5000 series - Alternatives?
Has anyone come up with alternative or DIY way to connect these boards out of TM5000? Something that would be much cheaper?For DIY, give a try to my own very project: Here are some more photos: /g/TekScopes/album?id=243643 |
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Re: Extender Cables for TM500/5000 series - Alternatives?
Zenwizard has a 2 slot unit he's using for open access.?? You'd need the TM5002, of course.
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Harvey On 2/9/2024 2:36 PM, Jim Ford wrote:
Hmmmm.... The "remove the sides" trick probably won't work on a TM515 portable like mine, though.? Darn, I guess that means I'll have to scout for a TM506 or TM5006 or a smaller TM50X mainframe.? Not that I'm in a hurry to give up the portable, mind you!? ? ? ?Jim Ford?Sent from my T-Mobile 4G LTE Device |
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Re: Extender Cables for TM500/5000 series - Alternatives?
You'd probably want to use the smallest TM module in which the plug-in will fit. That way one can get to three sides of the plug-on. I have a TM-501 dedicated for troubleshooting single-bay plug-ins. I'd want a two-bay module if I needed to troubleshoot a double-wide plug-in.
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DaveD On Feb 9, 2024, at 14:36, Jim Ford <james.ford@...> wrote: |
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Re: Extender Cables for TM500/5000 series - Alternatives?
Hmmmm.... The "remove the sides" trick probably won't work on a TM515 portable like mine, though.? Darn, I guess that means I'll have to scout for a TM506 or TM5006 or a smaller TM50X mainframe.? Not that I'm in a hurry to give up the portable, mind you!? ? ? ?Jim Ford?Sent from my T-Mobile 4G LTE Device
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-------- Original message --------From: Dave Daniel <kc0wjn@...> Date: 2/9/24 7:45 AM (GMT-08:00) To: [email protected] Subject: Re: [TekScopes] Extender Cables for TM500/5000 series - Alternatives? A couple of things come to mind.First, the question about where to find extension cables for Tektronix 7000 series scopes and TM-500/5000 power frames has come up many times in the past. I'd suggest that you check the message archives. Over the years, several list members have offered kits for building extension cables. I don't know if anyone is doing that at present.Second, the kits typically consist of a PCB for each end of the cable as well as pre-cut wires. The cable assembly is much more than just a cable, so the kits or pre-built cable assemblies, if one can find them, are more expensive than just a cable. Also, original extenders from Tektronix used to show up on ebay every once in awhile. Their rarity makes those expensive as well.It has been suggested that some troubleshooting can be done by just removing the side and bottom panels of a single-bay or two-bay power frame in order to get (limited) access to a plug-in's board(s) without using an extender.DaveD > On Feb 9, 2024, at 10:19, Frank Mashockie <fmashockie@...> wrote:> > ?Hi y'all!? I'm currently working on repairing a CG5011 calibrator generator.? It has a very strange fault symptom affecting the DC frequency modes.? Almost looks like when in + or - DC mode, the signal is being blocked by a coupling capacitor.? It looks very similar to when you look at signals being AC coupled on your scope.? The signal will attempt to reach the DC Volt/div setpoint, and then collapse to ground.? It will do this for all the lower voltage ranges until I get to higher voltages (10V or greater).? So very strange!? > > I've tried checking the numerous troubleshooting trees in the CG5011 manual and it looks like I will have to take a closer look at some of the boards.? I'll need to remove them from TM5003 to do this, but I don't have any extender cables.? I was looking on eBay to see if any were available and I saw some listed for ~$100 each!? That is ridiculous for a cable.? Has anyone come up with alternative or DIY way to connect these boards out of TM5000?? Something that would be much cheaper?> > Any help would be greatly appreciated!? Thanks!> > -Frank> > P.S. Links to vids on my YT channel documenting this repair:> > Part 1 - First impressions/fixing the current loop - > Part 2 - Replacing the broken variable encoder/first example of DC mode issue - > Part 3 - troubleshooting the DC freq mode fault > > > > >
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Re: Extender Cables for TM500/5000 series - Alternatives?
Dave Daniel¡¯s suggestion regarding access to the innards of the plug-in via removal of the side covers of a power supply module works very well providing that what you are after is accessible via that method. But the way the CG5001 is packed it looks like you have little chance of getting to what you want to see. In addition there is also the need for multiple extender cables and what appears to be the need for PC board extenders as well even if you get the box out of the power supply module.
One other issue with extender cables that I have dealt with especially on non-Tek equipment is when there are connections going between subassemblies in a module by way of the mother board in the mainframe there may be the possibility of some high-speed handshaking/data signals that may not like the addition of long cable lengths. When plugged directly into the mainframe these signals only have a short distance to travel to reach the adjoining module board(s) via the backplane. Just something to watch out for. When I pick up a legacy piece of test equipment that is new to my inventory I immediately look at what is required to maintain it in the way of adapters and such. I then put saved search terms out on ePay with part & model numbers to look for these items even though I most likely do not need them at the time. This gives plenty of time to look over what comes up to see if it is what I may need and is affordable. It¡¯s sort of a ¡°look ahead¡± approach. Taking this route has allowed the purchase of some very affordable items through ¡°buy it now¡± from ones that were just listed especially from those who have no idea as to what they have. Also, photos in the photo file of a third party TM500/5000 extender set (a pair) I recently posted that was picked up some time ago: ¡°Tek TM500/5000 Module Extender Assembly¡± Greg |
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Re: Extender Cables for TM500/5000 series - Alternatives?
You really should have asked for some advice here before hacking into that CG5011.
The encoder with a broken shat is repairable - you shave off the plastic ends of the posts clean up internally and install a fiberglass shaft, reusing the contact encoder wheel. You could have kept the CG5011, all original. As for the Lemo connector those are available, but expensive when new, but can be found on ebay used if you're lucky. The variable input is actually useful if your Var shaft is broken off. It's a remote Var hand control. It looks like someone has hacked into this pretty badly, there are missing pads already. The jumpers you were pointing out is probably rework someone did - most CAL labs are pretty bad with equipment. They can hack it and do whatever shoddy work they want. If they ruin the instrument they just tell you that it failed calibration, hahaha. I've even seen equipment come back from a failed cal with parts missing - and this was a national Cal Lab Chain. --Victor |
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Looking for P6022 lower body half PN 204-0362-02
From pages 34/ 35 of the P6022 user manual:
204-0362-02 BODY "ASSY,PROBE:LOWER" And the user manual is here: This is the lower half of the body shell that does not move while opening or closing the probe with the small rectangular opening at the end. I detected some very fine stress fractures around this rectangular hole that is basically what stops the probe movement in the closed position, and which is under constant pressure from the spring even when the probe is fully closed. In the mean time to relieve some pressure on that area I have temporarily only removed the spring, with the only difference that the probe will now no longer close by itself, but seems to work fine otherwise. The ball bearing and everything else are still in place. I could definitively live without replacing this part for now as I don't anticipate any heavy usage, just have to be careful when closing the probe. But given letting time pass usually does not make it any easier to find older parts, wanted to chance asking now in case somebody out there might have this probe body part and does no longer need it. Even a used in decent condition one would work fine for me. I have already checked with QService Greece but unfortunately they only have the upper body part listed on ebay. Thank you. |
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Re: Extender Cables for TM500/5000 series - Alternatives?
You'll almost certainly need to make an extender for the individual boards in the CG5011 as well as having extenders to connect to the TM5000 frame.
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See e.g. /g/TekScopes/files/CG5xxx%20Extender%20Construction.pdf David -----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Frank Mashockie Sent: 09 February 2024 15:20 To: [email protected] Subject: [TekScopes] Extender Cables for TM500/5000 series - Alternatives? Hi y'all! I'm currently working on repairing a CG5011 calibrator generator. It has a very strange fault symptom affecting the DC frequency modes. Almost looks like when in + or - DC mode, the signal is being blocked by a coupling capacitor. It looks very similar to when you look at signals being AC coupled on your scope. The signal will attempt to reach the DC Volt/div setpoint, and then collapse to ground. It will do this for all the lower voltage ranges until I get to higher voltages (10V or greater). So very strange! I've tried checking the numerous troubleshooting trees in the CG5011 manual and it looks like I will have to take a closer look at some of the boards. I'll need to remove them from TM5003 to do this, but I don't have any extender cables. I was looking on eBay to see if any were available and I saw some listed for ~$100 each! That is ridiculous for a cable. Has anyone come up with alternative or DIY way to connect these boards out of TM5000? Something that would be much cheaper? Any help would be greatly appreciated! Thanks! -Frank P.S. Links to vids on my YT channel documenting this repair: Part 1 - First impressions/fixing the current loop - Part 2 - Replacing the broken variable encoder/first example of DC mode issue - Part 3 - troubleshooting the DC freq mode fault |
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Re: Tektronix 2252 - Single Sweep Mode / Storage Mode
On Thu, Feb 8, 2024 at 05:53 PM, Stuart Cody wrote:
Greetings; I wonder if it would be appropriate to announce that I am sellingYou would probably get much better mileage and exposure from your sales offer if you do it in a separate dedicated posting. Good luck with the sale. |
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