Re: Dallas DS1225Y to Ramtron in 1780r
Mark,
As best I can tell from the two datasheets, the DS1225Y and the FM16W08 are 'pin compatible', only one is DIP and the other is SOIC, both being 28 pin.
Digikey seems to offer an adaptor board that seems to solve this issue.
It's not clear to me if this board offers the 'pins' for the DIP or not. Otherwise, it seems to be a simple '1:1' pin schematic, if I'm reading correctly.
If you have the board and can mount an FM16W08 chip on the board, it would appear to be a simple matter of sending me the DS1225Y chip and the 'replacement chip' mounted on the adapter and I can simply read the DS1225Y chip and then program the FM16W08 using the same DIP module.
I am still looking to see if I have a dedicated SOIC socket module.
Joe
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-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Mark Vincent Sent: Saturday, June 04, 2022 6:23 PM To: [email protected]Subject: Re: [TekScopes] Dallas DS1225Y to Ramtron in 1780r Joe, The Ramtron chips are surface mount. I do not have the adapter from DIP to surface mount. I have the Dallas chip. That is in a socket. Mark
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Carbon comp resistors were never made in tolerances less than 5% because they can drift that much from the heat of soldering. This sounds like a thick film resistor, lots of them available. I would go for at least a 2 watt size, maybe even 5 watt if it will fit.
?? This type of resistor is supposed to take power well but it sounds like it was seriously overloaded. Make sure something isn't pulling more current than is supposed to be there.
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On 6/4/2022 7:31 PM, n4buq wrote: The Z-Axis circuit in my 7514 was misbehaving and traced it to R710, a 5.62k, 1/2W which was checking in at around 10k. I placed two 22k in parallel with it and things started working again like they should so I'll be replacing that with a proper resistor soon.
This resistor appears to be something other than a carbon composition (it has a blue epoxy(?) coating and was originally a 1%) and it surprised me to find it that far out of tolerance. Oddly, I had a similar occurrence in a 7B50 where a resistor that looked very similar to this one had tripled in value and I wonder if others have seen this. I presume this is probably not a metal film and is possibly a carbon film and that might account for the drastic changes in resistance but don't know.
Thanks,
Barry - N4BUQ
--
Richard Knoppow
dickburk@...
WB6KBL
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Re: 5103N - Access to LV PS board question
I've been there a bit.
The clamp bars need to be removed, since they are holding the pass transistors in place.? The transistors are insulated with ceramic spacers that may (or may not) be beryllium oxide, so avoid breaking them and do not create any kind of dust.? IIRC, the back panel needs to be removed as well, which involves the back shield and the bolts for the transistor mount.? If this is like the one that I have, it's annoying at best and is far far below the standard of repair that I am used to.? IIRC, the power supply board will go in and out, but you need to see where it is binding.
The nuts will go back on, but you need a pair of needle nose pliers to start them, again, IIRC.
I'd personally like to hear the *engineering* decisions that went into that design.
Harvey
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On 6/5/2022 4:43 PM, Harold Foster wrote: So, I finally had some time and started trying to sort a 5103N I have had for some time and needed to access the low voltage power supply board. After much inspection and head scratching, pretty much every way I see to do so winds up involving a hacksaw - so, before I start cutting and welding, would someone please point me in the right direction?
It's held in with six screws, three per side, that can easily be removed - but then there are clamp bars on each side holding the pass transistors against the case for a heat sink and while I *might* get the nuts holding them on off, I'm pretty sure I would never get them back on. And then there are the ten things I don't know about yet because I've not gotten that far. Sigh.
TIA,
Hal
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5103N - Access to LV PS board question
So, I finally had some time and started trying to sort a 5103N I have had for some time and needed to access the low voltage power supply board. After much inspection and head scratching, pretty much every way I see to do so winds up involving a hacksaw - so, before I start cutting and welding, would someone please point me in the right direction?
It's held in with six screws, three per side, that can easily be removed - but then there are clamp bars on each side holding the pass transistors against the case for a heat sink and while I *might* get the nuts holding them on off, I'm pretty sure I would never get them back on. And then there are the ten things I don't know about yet because I've not gotten that far. Sigh.
TIA,
Hal
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Yep. Already in my plans to do so. Given the heat that resistor should have been producing, I'm a bit surprised the board isn't discolored but it isn't. Someone had adjusted the DC LEVEL pot completely to one (CW) stop and that might have accounted for why it wasn't getting hotter than it was. I had tried to adjust that but could not change the voltage at the test point and I surmised that Q714 was slammed fully on and that was due to R710.
I didn't have anything close to 5.62k so settled for a 2.2k a 3.3k in series (1W each) and that at least has me going for now. With things working, though, those two resistors get very warm!
Thanks,
Barry - N4BUQ
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----- Original Message ----- From: "Dave Wise" <david_wise@...>
To: "tekscopes" <[email protected]>
Sent: Sunday, June 5, 2022 9:46:11 AM
Subject: Re: [TekScopes] Another Bad Resistor Install the new resistors spaced away from the board to dissipate heat better.
Dave Wise
From: [email protected] <[email protected]> On Behalf Of n4buq via groups.io
Sent: Sunday, June 05, 2022 5:56 AM
To: tekscopes <[email protected]>
Subject: Re: [TekScopes] Another Bad Resistor
Hi Mark,
I hadn't done the math but, yes, R710 is run too close to its rating and will go
with something more that 1/2w for it.
I haven't done anything to the power supply yet. Voltages check very close but I
think I'm getting more ripple on at least one rail than should be there and
will need to replace some of those caps. Will try to remember to check that
zener while I'm in there.
Thanks,
Barry - N4BUQ
----- Original Message -----
From: "Mark Vincent"
<orangeglowaudio@...<mailto:orangeglowaudio@...>>
To: "tekscopes" <[email protected]<mailto:[email protected]>>
Sent: Saturday, June 4, 2022 10:17:43 PM
Subject: Re: [TekScopes] Another Bad Resistor Barry,
This resistor was underrated in wattage from the factory. A 5600 ohm 2W will
work. The wattage should be 2W. R714 should be 2W. R717 should be 1W and so on
throughout the scope. I wonder if VR982, 9V zener in the power supply, is open?
If so, use BZX85B9V1.
Mark
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Re: WTB: battery power pack for 422 scope.
Oops! Sent that waaay too early this morning. Somehow I read 222 and responded accordingly. Sorry for the confusion and BW.
Jeff
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On Jun 5, 2022, at 11:31 AM, greenboxmaven via groups.io <ka2ivy@...> wrote:
?Thank you for the reply. The 422 scope is many times the size of a 222 or 224, a totally different design.
Bruce Gentry, KA2IVY
On 6/5/22 9:09, Jeff Davis wrote:
Hi Bruce,
I make a replacement battery pack for the 222 scope. It’s out of stock at the moment but I expect to be restocked this week. See it at ;data=05%7C01%7C%7C0bede758911d41ba612f08da47219734%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637900506836775545%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=nutddIGNS91A17WGuQtvfacUNqF1A7ci2NS9UFKsr%2BM%3D&reserved=0. It will also be back on eBay once I’m restocked.
The battery pack lets you use standard 18650 lithium batteries in place of the original lead acid pack, which is no longer available. It requires no modification to the scope in any way, and fits in the original battery location.
73,
Jeff/N0DY Sent from my iPhone
On Jun 4, 2022, at 9:11 PM, greenboxmaven via groups.io <ka2ivy@...> wrote: ?I picked up a Tektronix 422 at the Rochester hamfest this morning, it works somewhat, the jug is bright, and I think it will restore very well. The manual mentions a battery pack for it, and I would like to find one. I am more concerned about it being complete than whether it works. Thanks,
Bruce Gentry, KA2IVY
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Re: WTB: battery power pack for 422 scope.
I am? aware of the different power supply modules. I need the entire battery power suppy that bolts on the back of the scope.
?? Bruce Gentry, KA2IVY
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On 6/5/22 11:00, Dave Wise wrote: Before you buy a battery, are you sure your scope can use it? Type 422 has a modular power supply which can be either of two types. Part number 016-0073-00 permits attachment of a battery pack, while 016-0072-00 is AC only.
Dave Wise
From: [email protected] <[email protected]> On Behalf Of Jeff Davis via groups.io
Sent: Sunday, June 05, 2022 6:09 AM
To: [email protected]; ka2ivy@...
Subject: Re: [TekScopes] WTB: battery power pack for 422 scope.
Hi Bruce,
I make a replacement battery pack for the 222 scope. It’s out of stock at the moment but I expect to be restocked this week. See it at <>. It will also be back on eBay once I’m restocked.
The battery pack lets you use standard 18650 lithium batteries in place of the original lead acid pack, which is no longer available. It requires no modification to the scope in any way, and fits in the original battery location.
73,
Jeff/N0DY Sent from my iPhone
On Jun 4, 2022, at 9:11 PM, greenboxmaven via groups.io <ka2ivy@...<mailto:ka2ivy@...>> wrote:
?I picked up a Tektronix 422 at the Rochester hamfest this morning, it works somewhat, the jug is bright, and I think it will restore very well. The manual mentions a battery pack for it, and I would like to find one. I am more concerned about it being complete than whether it works. Thanks,
Bruce Gentry, KA2IVY
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Re: WTB: battery power pack for 422 scope.
Thank you for the reply. The 422 scope is many times the size of a 222 or 224, a totally different design.
??? Bruce Gentry, KA2IVY
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On 6/5/22 9:09, Jeff Davis wrote: Hi Bruce,
I make a replacement battery pack for the 222 scope. It’s out of stock at the moment but I expect to be restocked this week. See it at . It will also be back on eBay once I’m restocked.
The battery pack lets you use standard 18650 lithium batteries in place of the original lead acid pack, which is no longer available. It requires no modification to the scope in any way, and fits in the original battery location.
73,
Jeff/N0DY Sent from my iPhone
On Jun 4, 2022, at 9:11 PM, greenboxmaven via groups.io <ka2ivy@...> wrote:
?I picked up a Tektronix 422 at the Rochester hamfest this morning, it works somewhat, the jug is bright, and I think it will restore very well. The manual mentions a battery pack for it, and I would like to find one. I am more concerned about it being complete than whether it works. Thanks,
Bruce Gentry, KA2IVY
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Re: Spurious signals on TDS794D - Repair help needed.
And after replacing U405, I now have a fully working unit. Hooray! :)
Thanks Jay for the assistance.
Jared
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Re: Spurious signals on TDS794D - Repair help needed.
Great, thanks for the info!
I replaced U413 and now have an error on address 0x730000a, so I think there are a number of bad RAM chips to chase down...
Can you provide more info from your experiments? If you could list all the info you have as you did previously, it will save me having to run through and do it myself.. :)
Thanks!
Jared
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Re: WTB: battery power pack for 422 scope.
Before you buy a battery, are you sure your scope can use it? Type 422 has a modular power supply which can be either of two types. Part number 016-0073-00 permits attachment of a battery pack, while 016-0072-00 is AC only. Dave Wise From: [email protected] < [email protected]> On Behalf Of Jeff Davis via groups.io Sent: Sunday, June 05, 2022 6:09 AM To: [email protected]; ka2ivy@... Subject: Re: [TekScopes] WTB: battery power pack for 422 scope. Hi Bruce, I make a replacement battery pack for the 222 scope. It’s out of stock at the moment but I expect to be restocked this week. See it at <>. It will also be back on eBay once I’m restocked. The battery pack lets you use standard 18650 lithium batteries in place of the original lead acid pack, which is no longer available. It requires no modification to the scope in any way, and fits in the original battery location. 73, Jeff/N0DY Sent from my iPhone On Jun 4, 2022, at 9:11 PM, greenboxmaven via groups.io <ka2ivy@...<mailto:ka2ivy@...>> wrote:
?I picked up a Tektronix 422 at the Rochester hamfest this morning, it works somewhat, the jug is bright, and I think it will restore very well. The manual mentions a battery pack for it, and I would like to find one. I am more concerned about it being complete than whether it works. Thanks,
Bruce Gentry, KA2IVY
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Install the new resistors spaced away from the board to dissipate heat better. Dave Wise From: [email protected] < [email protected]> On Behalf Of n4buq via groups.io Sent: Sunday, June 05, 2022 5:56 AM To: tekscopes < [email protected]> Subject: Re: [TekScopes] Another Bad Resistor Hi Mark, I hadn't done the math but, yes, R710 is run too close to its rating and will go with something more that 1/2w for it. I haven't done anything to the power supply yet. Voltages check very close but I think I'm getting more ripple on at least one rail than should be there and will need to replace some of those caps. Will try to remember to check that zener while I'm in there. Thanks, Barry - N4BUQ ----- Original Message ----- From: "Mark Vincent" <orangeglowaudio@...<mailto:orangeglowaudio@...>>
To: "tekscopes" <[email protected]<mailto:[email protected]>>
Sent: Saturday, June 4, 2022 10:17:43 PM
Subject: Re: [TekScopes] Another Bad Resistor Barry,
This resistor was underrated in wattage from the factory. A 5600 ohm 2W will
work. The wattage should be 2W. R714 should be 2W. R717 should be 1W and so on
throughout the scope. I wonder if VR982, 9V zener in the power supply, is open?
If so, use BZX85B9V1.
Mark
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On my 2465 I was able to clear such errors with "Exerciser 3", Cycle Error Clear. Your 2467 may have the same or similar diagnostic function. Worth a try.
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Re: WTB: battery power pack for 422 scope.
Hi Bruce,
I make a replacement battery pack for the 222 scope. It’s out of stock at the moment but I expect to be restocked this week. See it at . It will also be back on eBay once I’m restocked.
The battery pack lets you use standard 18650 lithium batteries in place of the original lead acid pack, which is no longer available. It requires no modification to the scope in any way, and fits in the original battery location.
73,
Jeff/N0DY Sent from my iPhone
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On Jun 4, 2022, at 9:11 PM, greenboxmaven via groups.io <ka2ivy@...> wrote:
?I picked up a Tektronix 422 at the Rochester hamfest this morning, it works somewhat, the jug is bright, and I think it will restore very well. The manual mentions a battery pack for it, and I would like to find one. I am more concerned about it being complete than whether it works. Thanks,
Bruce Gentry, KA2IVY
|
Hi Mark,
I hadn't done the math but, yes, R710 is run too close to its rating and will go with something more that 1/2w for it.
I haven't done anything to the power supply yet. Voltages check very close but I think I'm getting more ripple on at least one rail than should be there and will need to replace some of those caps. Will try to remember to check that zener while I'm in there.
Thanks,
Barry - N4BUQ
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----- Original Message ----- From: "Mark Vincent" <orangeglowaudio@...>
To: "tekscopes" <[email protected]>
Sent: Saturday, June 4, 2022 10:17:43 PM
Subject: Re: [TekScopes] Another Bad Resistor Barry,
This resistor was underrated in wattage from the factory. A 5600 ohm 2W will
work. The wattage should be 2W. R714 should be 2W. R717 should be 1W and so on
throughout the scope. I wonder if VR982, 9V zener in the power supply, is open?
If so, use BZX85B9V1.
Mark
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The TDS500/600/700 series are bad for this too.
A number of scrapped 'dumpster' scopes I've acquired for parts have had the case removed with the liberal use of aluminium snips.
There have been a couple that weren't scrap that had been dropped sometime in their lives or during transit that a needed careful application of force to remove the case with a minimum of damage.
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Re: SP20F1R50JLF resistors WTB (25)
The PAC100001508FA1000 available at Digi Key should work provided 1W is enough.
It is 1%, 100PPM.
Not sure if the fit is the same.
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Have seen also some factory underrated resistors in horizontal/vertical amplifiers of series 2200.
Giuliano
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Re: 8608 Vacuum Tube Plate Cap Needed
Hello Jim,
I think I have what you need. I can send it to you, just send me a PM.
Cheers
Chris
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WTB: battery power pack for 422 scope.
I picked up a Tektronix 422 at the Rochester hamfest this morning, it works somewhat, the jug is bright, and I think it will restore very well. The manual mentions a battery pack for it, and I would like to find one. I am more concerned about it being complete than whether it works. Thanks,
?? Bruce Gentry, KA2IVY
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Harold Foster
Jared Cabot