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Re: 2465 Delta Cursor not visible FIXED
FIXED!!!!
The problem was indeed a faulty U850B (4053B). I removed the A1 (an interesting challenge!!!), de-soldered the chip and inserted a socket and removed a 4053 from a parts mule and hey presto, TWO Cursors!!! Just as well I have a nice de-soldering station. SOMEWHERE in my attic (I'm sure) I had/have tons of 4000 series but I have no idea where they are so I was forced to re-use a device from another board; not ideal but hey it worked (silly prices on eBay). Just a minor issue but still haven't got a true zero brightness when the Readout Intensity is set to mid-way; As far as I understand the display should blank 100% at mid-point? Haven't noticed any adjustments in the set-up for such a condition. Not particularly important but would be nice to get it right. |
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Re: Tek DSA8300 sampling scope discontinued
As far as I know, to who I am also directly affected. The 8300 as well as the 80E, 80A and 80O modules will be discontinued and won't have a direct successor.
There is the 8 Series Sampling Scope but as far as I know, no electrical Sampling modules are planned for now. So let's hope that the DSA and it's modules still have long years without issue. |
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Re: DSA power supply random shutdown - any known problems?
Martin,
Check/replace the caps in the startup circuit. As you said, the small values can give problems. Small value tantalums, if this uses them in this area, could be high ESR or open. Film types can replace the low values such as 1-5 mfd. A 1 mfd type that could be in series with an optocoupler will cause startup problems. Computer power supplies usually have one of these. A film type makes it start easy. If it still is hard to start, jumper the power switch to eliminate contact problems in the switch. Anyone else on this group that has more knowledge jump in. Mark |
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Re: DSA power supply random shutdown - any known problems?
Hello Vincent,
you are right in the assumption that the power supply has not been recapped. At least not by me. Of course recapping might correct the issue, but I do not think its the large caps that cause this behaviour. Actually, when the supply acts up, it had some problems during startup - either a delay of a second or two, or I needed to toggle the power switch 2 or 3 times. So it looks like there is a problem in the startup circuitry. Since I've seen the same behaviour on 2 or 3 DSA I wonder if there might be a weak point... I've repaired a number of HP server supplies that did not start up after a power down. In all cases that was due to a small, vulgar electrolytic capacitor that supplies the startup circuitry. cheers Martin |
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Re: DSA power supply random shutdown - any known problems?
Martin,
I do not have one of these, I would like to. Going on an assumption, please no flaming from others who can/will correct me, I will assume the unit has not been recapped. If that assumption is correct, recap it with ones line Nichicon ULD , LGR, UCY or UHE. The old electrolytics will cause problems. Raising the value/voltage will be fine and likely advised. Having items that had their main filter caps replaced, those worked right at turn-on after new ones were installed, this means test equipment, TVs, audio, radios, etc.. If you have recapped it, ignore the previous. It is possible there is a problem with ICs/software version. You can check connections for dirt, clean/reseat ICs/transistors that are in sockets, make sure the fan is moving enough air and oiled. I wonder if a plug-in needs new condensers. I hope I was of some help. If not, I offer my apology. Mark |
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Re: 2445 PSU NTC inrush limiters
Thanks Mark
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I went with the 5¦¸/8¦¸ ones in the end, plus, FWIW worth some new 15¦¸ resistors as well though I agree, they were not shown in the 2445 service manual that I have, but *are* in the 2445B schematics. Does anyone know why they were added? On 21/02/2022 21:10, Mark Vincent wrote:
Paul, |
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Re: TM500 MANUAL FOR SPARAMETER test set
Whoa!
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That's a novelty for sure. I am willing to be surprised but I don't think Tek made such a P/I. I think many of us would love to see the innards. On Fri, Feb 18, 2022 at 4:58 AM Miguel Work <harrimansat@...> wrote:
Hi, I need manual for a sparameter test set |
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Re: 2445 PSU NTC inrush limiters
Paul,
The NTCs can be CL60 each. For when one is used, I usually use CL70. You could get 8ohm types to put in the scope. I do not see the purpose of the resistors across the NTCs as you also said. My 2465 and B did not have them from the factory so I did not add them. Mark |
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Re: Hakko 470 Problems
You won't get a huge amount of pulling force with a vacuum desoldering iron. It's a very small surface area. They need good flow more than huge pull. That's why it's important to get a good tight seal against the nozzle when using these. That keeps the vacuum level up and the flow rate pulls the solder up the tube. And yes, you need the filters. You may be able to kludge something if you can't find any replacement parts.--EricSent from my Galaxy
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-------- Original message --------From: n4buq <n4buq@...> Date: 2/21/22 1:16 PM (GMT-06:00) To: tekscopes <[email protected]> Subject: Re: [TekScopes] Hakko 470 Problems Yes, I would want to run it with filters in place.? Unfortunately, the Filter Retainer (B1030) is missing and I'm not finding much in the way of replacements for that.? I do have the A1030 but the A1033 filter needs to be replaced.? I'm still concerned that without any filters in place (which would only degrade the vacuum pressure), I can barely feel any suction at the end of the heating element (i.e. without a nozzle in place).? As I said, the hole in the element was clogged and I've cleaned that out but still not much vacuum.? Perhaps I'm just expecting more than it's supposed to supply and just a minimal amount of vacuum is really all that's needed in most cases.Thanks,Barry - N4BUQ----- Original Message -----> From: "Greg Muir via groups.io" <big_sky_explorer@...>> To: "tekscopes" <[email protected]>> Sent: Monday, February 21, 2022 12:51:59 PM> Subject: Re: [TekScopes] Hakko 470 Problems> The Hakko 470 manual ()> indicates two filters ¨C part numbers A1009 & A1033.? Googling those part> numbers brings up many distributors who still handle them.? Looks like you also> have to have a A1000 ¡°spring filter¡± as part of the whole assembly if you don¡¯t> have one.> > Any use of these units without filters will result in loss of vacuum at the> least and death to the vacuum pump at the most.> > Greg> > >
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Re: Hakko 470 Problems
Yes, I would want to run it with filters in place. Unfortunately, the Filter Retainer (B1030) is missing and I'm not finding much in the way of replacements for that. I do have the A1030 but the A1033 filter needs to be replaced. I'm still concerned that without any filters in place (which would only degrade the vacuum pressure), I can barely feel any suction at the end of the heating element (i.e. without a nozzle in place). As I said, the hole in the element was clogged and I've cleaned that out but still not much vacuum. Perhaps I'm just expecting more than it's supposed to supply and just a minimal amount of vacuum is really all that's needed in most cases.
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Thanks, Barry - N4BUQ ----- Original Message -----
From: "Greg Muir via groups.io" <big_sky_explorer@...> The Hakko 470 manual () |
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Re: Hakko 470 Problems
The Hakko 470 manual () indicates two filters ¨C part numbers A1009 & A1033. Googling those part numbers brings up many distributors who still handle them. Looks like you also have to have a A1000 ¡°spring filter¡± as part of the whole assembly if you don¡¯t have one.
Any use of these units without filters will result in loss of vacuum at the least and death to the vacuum pump at the most. Greg |
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Re: 2465 Delta Cursor not visible
On Mon, Feb 21, 2022 at 5:03 AM NigelP <nigel-pritchard@...> wrote:
It's looking like a 5V S/C to pin-2 of the 4053. Isolating the A1Interesting. You should also be able to see whether this is U850B or back-feeding from U900 DR without desoldering. If you engage double delay sweep, I figure the display sequencer should be toggling the SEL line to alternate the selected sweep reference... |
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Re: Hakko 470 Problems
Barry,
I've had several of the similar 472 units for several decades, and can maybe offer some insight here. First thing to do is to ensure that there is no crud buildup inside of the tip or the heater in the handpiece. There are two inline filters, one in the handpiece inside of the cylinder that holds the solder catching spring, and one in the base right behind the screw on nipple. Both should be present, and the one in the handpiece plugs often in use, while the one in the base rarely requires attention: I'd say I change 10 - 20 of the handpiece filters for every base filter. A hole in a diaphragm will likely be quite obvious, but the flapper valves can (and do) wear out, but these problems are usually noticeable when you disassemble and inspect the heads. If the unit was operated without filters, or in an environment with a lot of liquid flux, the pump might have sticky residue all over the internals, which should be carefully cleaned. Lastly, if the tip is worn out (particularly if you are using a large size tip), the hole may now be too big, which will give the impression of low vacuum. If I think I have a problem, I remove the cylinder from the handpiece and use my finger to check the pull when the pump is operated at both the input and output of the cylinder. It's normal to have quite a bit of drop across the handpiece filter (particularly with the late model paper filters), but when the handpiece filter is plugged, there will be almost no perceived suction at the tip end of the cylinder. The suction you described at the base output sounds kind of normal. As previously pointed out, Hakko dropped support for these units last year, and parts are drying up fast - lay in your lifetime supply of spares now if you haven't already. Regards - Kurt |
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DSA power supply random shutdown - any known problems?
Hi,
recently my DSA602, due to power supply shutdown, required 3 attempts to start up successfully. Some minutes later it had a short power-out during operation that made the user interface stall. A further restart was OK, and it ran without problems for hours. Its not the first time I have these shutdowns, and I've seen this on another DSA. It seems to happen at any time, but may be fine for months. Is there a known problem in the power supply causing the supply to randomly shut down? cheers Martin |
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2445 PSU NTC inrush limiters
Hi all
As I might have mentioned I have another sick 2445, this time probably U800 as no horizontal deflection (but I *might* have a U800 in one of the parts 'scopes I also still have). Anyway, debugging this one lasted about 10 seconds before the RIFA caps in the PSU blew their guts out, so the PSU needs some attention first. While I have the PSU out I will take the opportunity to replace the other suspect caps and I'm contemplating a full recap but the electrolytics which are in situ look OK so..... maybe I'll leave them. I haven't found many suspect components - though the 30ohm resistor in series with the RIFA that blew is open (as you might expect) However the NTC inrush limiters RT1010 and RT1016 seem to be somewhat higher than nominal - about 41 ohms at room temp for the "7.5 ohm" one and 15 ohms for the "5 ohm" one. Admittedly "room temp" is about 22-23 degrees C at the minute, not 25 but I've warmed both between finger and thumb and they don't get to their nominal values. This order needs to be from DigiKey because only they stock the magic indicator switch caps and I'd like pick those up at the same time. Ametherm SG200 looks a reasonable bet for RT1016 (supposed to be Rodan SG-6), and SG64 plausible for RT1010 (supposed to be 75DJ7R5R0220SS), or maybe Amphenol CL-50B, I don't suppose that it is terribly critical - although the Amphenol part is only rated 5A Also, some people recommend replacing the 15ohm resistors which are in parallel with the NTCs with higher wattage ones - but I can't see the point as they will be shunted when the NTCs are up to temp. What is the group consensus? Kind regards Paul |
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Re: P6015A HV probe, trimpot R7 value?
Yeah, I read the same. Butane has a similar vapor pressure to Freon so it apparently works well, up to and in excess of the working voltage of the probe.
However, the flammability is a concern.... The main problem with other refrigerants is finding one with a similar vapor pressure, too high and you may end up with a little grenade in your hands... Jared |
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Re: Hakko 470 Problems
I didn't notice much residue on the valves but I do notice that they're made of a white material and the replacements I'm seeing are clear. That might not indicate anything unordinary but I'm wondering if the valves I have might not be flexible enough or seal well enough and it may be a good idea to get replacements for them.
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Thanks, Barry - N4BUQ ----- Original Message -----
From: "Glenn Little" <glennmaillist@...> Try cleaning the vaporized flux residue from the valves on the pump. |
Martin
Jared Cabot