Re: Question: 013-0115-00 2600/7000 series adapter for use with 7k series oscilloscopes
Does anyone have photos of Both sides of the Adapter PCB ?
Or a spare 013-0115-00 2600/7000 adpater ?
thank you
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Re: Question: 013-0115-00 2600/7000 series adapter for use with 7k series oscilloscopes
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Question: 013-0115-00 2600/7000 series adapter for use with 7k series oscilloscopes
Anyone have the .pdf schematic or Manual for the :
Tek 013-0115-00 2600/7000 series adapter ( for use with 7k series oscilloscopes & 26xx Plug-in's ) ?
Or,
Has anyone made a Kludge of this adapter to allow these short ( ~ 9" long) 26xx units to plug into a 7k Mainframe ?
nb: Nice Tek parts in these ( possibly undervalued ? ) 26xx Plug-ins.
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Re: trigger problem with 7B70
On Apr 8, 2024, at 19:20 , Ozan via groups.io <ozan_g@...> wrote:
Your suspicion is valid. How do transistors from bad unit perform in the good 7B70? If they work fine then they are not the root cause of the failure. Indeed, the slow transistors from the bad unit work fine in the good one. I should have thought to check that myself. Since faster transistors helped, most likely the issue is the signal rise-time or amplitude at the bases.
- What amplitude do you see at the left side of R300/R306 for good and bad unit? With 1kHz/1Vpp sine applied to EXT and conditions specified in the manual: Good R300 LHS: Good R306 LHS: Bad R300 LHS: Bad R306 LHS: - DC voltage at base was slightly higher than what schematic showed. What voltage do you see at the emitter of Q170/Q171, which are the main current source to TD stage. Good Q170E/Q171E: -1.35/-1.34V to chassis ground Bad Q170E/Q171E: -1.32/-1.33V to chassis ground - In some plugins resistors going high in value was the issue. If you pull out Q170 and Q172 (if they are socketed) you can measure R173/R175/R176/R177/R178/R179. They are socketed, so that's easy. Let's see if tabs survive the listserv: Bad Good R173 202 216 R175 8.2 8.5 R176 4.32k 1.21k R177 8.1 8.7 R178 inaccessible need to find R179 198 215 * Bad plugin is 173,xxx serial, Good is 237,xxx serial. * The R176 value is correct; the old one should be a 4.3k 1W 5% carbon comp, and is supplied by -50V. The new/good one should be 1.21k and -15V supply. * R178 on the old one might require dismantling it to get to the main interface board. * R175/177 should be 7.5 ohms 5% nominal, per the parts list. Ironically, the bad one is closer to spec. thanks, Adam
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Re: 7704A 10X causes ghost readout and trace
Does it do this regardless of which bay the plugins are in?
Barry - N4BUQ
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Hi all,
Messing with my new 7704A, I've run into an odd problem with the readout and
can't find a hint in the archives. Using the 10X magnifier on a horizontal
plugin results in a duplicate/ghost readout and trace under some conditions,
depending on the plugin. For the 7B70, it occurs at any sweep speed:
1) normal trace (10 MHz sine)
2) depress 10X (also normal)
3) back to 1X (messed up)
Even when messed up, the readout values change, and sweep speed appears to match
the readout (i.e., 100ns gives one peak/div, although there's a double trace).
I have three horizontal plugins that trigger this behavior, and the only way to
clear it is to turn the mainframe off and on again.
I've cleaned the cam switches to no avail (paper and ethanol). DC supply
voltage/ripple were in spec with no adjustment.
One of the horizontal deflection spade connectors was loose to the CRT, and
tightening that fixed a sort of fisheye distortion at fast sweep speeds. I've
not tried any calibration steps.
thanks,
Adam
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Re: 7704A 10X causes ghost readout and trace
Hello:
More likey to get answers if you just post the photos to an album in the forum FILES section eg
7704A 10X/1X RO. See left sidebar.
Did you already exercise and clean/lube all the switches?
Did you try the same with other plugins?
Jon
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Re: trigger problem with 7B70
On Mon, Apr 8, 2024 at 06:54 PM, Adam R. Maxwell wrote: Indeed, a pair of NOS 151-0220-00 transistors in Q309/Q317 did not fix the
problem. I'm curious to see if the faster transistors I've ordered will do the
trick, although if so I suspect it would just be papering over problems with
some other marginal component(s). Hi Adam, Your suspicion is valid. How do transistors from bad unit perform in the good 7B70? If they work fine then they are not the root cause of the failure. Since faster transistors helped, most likely the issue is the signal rise-time or amplitude at the bases. - What amplitude do you see at the left side of R300/R306 for good and bad unit? - DC voltage at base was slightly higher than what schematic showed. What voltage do you see at the emitter of Q170/Q171, which are the main current source to TD stage. - In some plugins resistors going high in value was the issue. If you pull out Q170 and Q172 (if they are socketed) you can measure R173/R175/R176/R177/R178/R179. Ozan
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Re: trigger problem with 7B70
On Apr 4, 2024, at 22:18 , Adam R. Maxwell via groups.io <amaxwell@...> wrote:
I assume the (much!) slower transistor worked at some point in the low serial number unit, but Tek must have had a reason for that change. I've grown a bit less optimistic that NOS 151-0220-00 transistors will be the silver bullet, though. Indeed, a pair of NOS 151-0220-00 transistors in Q309/Q317 did not fix the problem. I'm curious to see if the faster transistors I've ordered will do the trick, although if so I suspect it would just be papering over problems with some other marginal component(s). thanks, Adam
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7704A 10X causes ghost readout and trace
Hi all,
Messing with my new 7704A, I've run into an odd problem with the readout and can't find a hint in the archives. Using the 10X magnifier on a horizontal plugin results in a duplicate/ghost readout and trace under some conditions, depending on the plugin. For the 7B70, it occurs at any sweep speed:
1) normal trace (10 MHz sine)
2) depress 10X (also normal)
3) back to 1X (messed up)
Even when messed up, the readout values change, and sweep speed appears to match the readout (i.e., 100ns gives one peak/div, although there's a double trace). I have three horizontal plugins that trigger this behavior, and the only way to clear it is to turn the mainframe off and on again.
I've cleaned the cam switches to no avail (paper and ethanol). DC supply voltage/ripple were in spec with no adjustment.
One of the horizontal deflection spade connectors was loose to the CRT, and tightening that fixed a sort of fisheye distortion at fast sweep speeds. I've not tried any calibration steps.
thanks,
Adam
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Re: Tek 26G1 Rate / Ramp Generator plug-in ??
I have a 26G2 that I'll never use.? Untested.
Harvey
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On 4/8/2024 8:13 PM, Chappy wrote: Manual located here, along with a link to the mainframe that the module belongs with.
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Re: Tek 26G1 Rate / Ramp Generator plug-in ??
Manual located here, along with a link to the mainframe that the module belongs with.
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Modification of the 26A1 Op Amp module ?
Curious if anyone has ever modified the 26A1 Op Amp module for other (newer) devices or applications ?
--- Anyone has the a spare adapter that allows 26A1 use in a 7xxx scope ?
possibly:
013-0115-00 2600/7000 series adapter for use with 7k series oscilloscopes ?
rick
{ aside: I am toying with the an AD precision HV Op Amp: ADHV4702-1 ....:
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Tek 26G1 Rate / Ramp Generator plug-in ??
Anyone know about the Tek 26G1 Rate / Ramp Generator plug-in ?
What were they used for ?
-- Any Manuals ?
( I do not see them immediately in the Files Section. Are they hidden ? )
These plugins are short: perhaps 9" long.
Does anyone have a spare extender card to mount this plug-in into a 7xxx Mainframe ?
Possibly:
013-0115-00 2600/7000 series adapter for use with 7k series oscilloscopes
thank you,
rick
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You can try spraying some deoxit F5 formula in there. Cleans the contacts AND lubricates.
You will also likely find yourself applying it to nearly every single pot and switch on the thing.
Since it's a TM500 unit, you can take off the side covers and get more in there. I recommend pulling off the switch cover on the front panel then spraying it for easy.
More more thorough, spray at the back.
Apply sparingly though. Too much is never good.
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Re: TDS744A tick tick tick when power on (and something smelling)
Hello,
Didn't expect to get this far already - considering weekend is over.
PSU removed to have caps replaced
CRT pulled out (was a while since I used my HV meter, but it seems to be working still)
Display circuit board removed.
Haven't checked all caps yet (will do), but Q540 on A32 Video board has a BC voltage of 0.3 V in both directions. Doesn't look good.
It's an MRF544 NPN transistor and although both Mouser and DigiKey have the datasheet, they both claim it obsolete.
Any suggestions for a replacement that is feasible? I will anyways check the specification, but any suggestions would of course be welcome.
CR560 (Q540 emitter via 39 Ohms - CR560 - +75 V) doesn't seem OK either. This could be an effect of it being shorted by Q540 though.
Q510 (MPS H81 PNP) seems to have a short on BC - possibly driving Q540 hot. This one seems to be obsolete too (quick search) so any hints here also would of course be appreciated!
Investigation will continue, but these two transistors will be removed for some more checks at least.
Regards,
Staffan
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Re: Help! I bricked a perfectly functioning 2467B!
True, power goes off on RAM and it loses it's data, UNLESS it has an external battery like the pre-B050xxx s/n scopes.
Which is what Don has.
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Thanx for all the comments. This is my first entry into this arrangement. I see the "barrier" ties that keep some modules from fitting. I also see the note on the chassis for the high power bay. Good to know all slots are the same otherwise.
Nonetheless, I took the one side of the TM504 apart & was able to power up the DM501A & check the 3 supply voltages. They were all fine, so that confirms the TM504 & 501A PS components are good.
So the first IC I pulled was U1805 (74C48J) the LED driver. At 72 my eyes & very short term memory is not the best. I reinserted it upside down. DOH!!! So now the display never really comes fully back to life like it did before.
I ordered a replacement, & it should be here at the end of the week. I found one on Ebay for $22!!! No I didn't buy that one, buy I was surprised to find that they are ~11 at most houses that still have them. And I couldn't find a more modern substitute.
I know, I'm an idiot, but I couldn't let this thing not work properly. Too often, I seldom quit while I'm ahead.
-Bob
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Re: OT: need info for ILD855 optocoupler
Curious:
Are there .pdf Data Sheets for any of these ?
&
What Tek equipment model #'s use them ?
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I ordered a 1434 video noise generator 2 months ago, late friday it was delivered after being lost in shipping.
The box was damaged but the unit showed no damage, however before pluging it in I tried pushing each button.
I found several cracked buttons but two switches were engaged (Attenuator select A and B), they are designed to
operate one disengaging the other, they will not release now when pressed.
Does anyone know a way to release one or both of these without removing the switch assembly?
Thanks for any help.
--
Jeffeelcr
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Jean-Paul
Benjamin Badrakh
Bob W8RMV