Date   

Re: Help with Two Replacement Parts

Ed Breya
 

I finally looked at the 465 manual (not 465B - don't recall which one the OP is about). It looks like that cap is bypassing the regulated +55V supply. I'd recommend replacing the wet Ta original with the biggest Al electrolytic cap that will fit, rated at 100V, 105 deg C. Preferably something around 10 uF or more. Two smaller caps paralleled may fit easier, depending on the layout and space.

If space is really tight, another option is to put a fairly large plastic cap like 1 uF, 100V - whatever can fit in the spot that the original took - right on the board, then add flying leads from those points to the Al electrolytic cap(s) as described above, but mounted somewhere more convenient, and reasonably close by, like within a couple of inches, if possible. The electrolytic cap would have to be properly supported, and the leads insulated from possible shorting, of course.


Re: TLS216 at Singer

Charlie Conger
 

It is real 8 bit converters. Further it allowed you to adjust the level of obscurity that you looked at the digital traces in. For example you could change logic levels or even show three state logic to get a quick idea if you had slow edges. The sacrifice was it was a small screen to show so much data and the UI is awkward to use to control so any channels. Power users loved them though and they were manageable.

Charlie Conger


Re: My 2465 just died

mosaicmerc
 

I believe member Jerry Massengale should have an external load tester/monitor available for the 24xx series for simpler repair.
Ancel


Hacked don't open-WE MISS YOU---and----FINAL NOTICE

Wes Rule <wes_rule@...>
 

Jorja says my mail was Hacked with these titles  WWR

[Non-text portions of this message have been removed]


Re: Help with Two Replacement Parts

Paul Amaranth
 

I would use a 35V 47uf tantalum to replace c1419.

For C1534, you're on a 55V rail and there's not a lot of space, so
putting a radial cap in is going to be messy. Mouser lists 3 poly film
3uf at 100V that would probably work, but I don't know if they would
fit. They're also $12.00 a piece. Tek also spec'd that cap for 150V,
so they probably had a reason. That's connected to the hv inverter
transformer, so there's going to be some significant transients to deal
with. I would stick to 150V or higher rating on that one.

You might be able to find a 3uf 150V solid tantalum axial cap on ebay.
The problem is that is a very high voltage rating in a small form
factor and high voltage tantalums are expensive. There's a 3uf
200V tantalum on ebay for $33.50 although there's a make offer
on that one. Maybe you could get it for $20. Still looks a bit
large though.

As a side note, clipping leads is not the way to identify bad parts;
you will likely destroy the part (and some of these are expensive or
unavailable) and tack soldering it back together is a poor hack. A
465 cost the equivalent of a small car when it was new.

It would also help if you tell us where that part is. It took me ten
minutes paging through the manual to track down what circuits those
parts were in. Then I had to pull open a 465 to find them on the
board.

--
Paul Amaranth, GCIH | Rochester MI, USA
Aurora Group, Inc. | Security, Systems & Software
paul@... | Unix & Windows


My 2465 just died

Paul Richardson
 

Hi,
I just dusted off my 2465 after 10 years in storage. It powered up and worked fine for 10 mins but after being switched off and on again it has died. I'm hoping to have some fun getting it back up and running with the group's help. The symptoms are;
- no clicks, beeps, smells or bangs on power on.- All front panel lights come on and stay on.- CRT shows as a spot near the bottom left of the screen and moves a little if beam find is pushed.- none of the front panel controls do anything.
I have the service manual which looks very comprehensive which I've made a start on.Luckily my 7633 is still working, which may be useful.
I'm expecting to replace components that have aged - to be expected given its age.
The obvious place to start is with the PSU. Can I remove them from the chassis and power them up separately to check them?
I'd appreciate any guidance and tips before I get stuck in.
Thanks in advance,Paul


Re: 2235A PSU troubleshooting

Steve
 

Not yet, I'm planning to check the ESR first.


Re: 2465B CAL Settings?

n4buq
 

Ah - I see that now in italics at the top of page 5-12. I'd missed that.

Thanks!
Barry - N4BUQ

----- Original Message -----
From: "Alessandro Cattaneo cattaneoa43@... [TekScopes]" <TekScopes@...>
To: TekScopes@...
Sent: Wednesday, April 6, 2016 9:22:08 AM
Subject: Re: [TekScopes] Re: 2465B CAL Settings?

Hello,
you must move the jumper J501 in cal position on the A5
sheet.RegardsAlessandro Cattaneo


Il Mercoledì 6 Aprile 2016 15:59, "very_fuzzy_logic@...
[TekScopes]" <TekScopes@...> ha scritto:


  On mine, CAL appears appears a couple of clicks after EXER 08 probably
  depending on what options you have installed. Pressing the lower MODE
  button from the opening screen gets gets straight to the CAL options.

Roger

[Non-text portions of this message have been removed]

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Re: 2235A PSU troubleshooting

Darren Ting
 

Have you do recap? If not recap may solve the problem 

Sent from Yahoo Mail on Android

On Wed, 6 Apr, 2016 at 22:30, stevevandal@... [TekScopes]<TekScopes@...> wrote:  
Hi folks.


I have a 2235A, when I turn on the scope, the power supply is cycling on and off every second.
The power LED on the front panel and the 2 neon bulb ds856, ds858 come on and off.
Anyone has a clue what is faulty with this PSU .
Thanks







[Non-text portions of this message have been removed]


2235A PSU troubleshooting

Steve
 

Hi folks.


I have a 2235A, when I turn on the scope, the power supply is cycling on and off every second.
The power LED on the front panel and the 2 neon bulb ds856, ds858 come on and off.
Anyone has a clue what is faulty with this PSU .
Thanks


Re: 2465B CAL Settings?

Alessandro Cattaneo
 

Hello,
you must move the jumper J501 in cal position on the A5 sheet.RegardsAlessandro Cattaneo

Il Mercoledì 6 Aprile 2016 15:59, "very_fuzzy_logic@... [TekScopes]" <TekScopes@...> ha scritto:


  On mine, CAL appears appears a couple of clicks after EXER 08 probably depending on what options you have installed. Pressing the lower MODE button from the opening screen gets gets straight to the CAL options.

Roger



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Re: 2465B CAL Settings?

n4buq
 

I've scrolled through a few times and it circles back to TEST 01 after the last EXER. Would CAL menus be dependent on options?

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "very_fuzzy_logic@... [TekScopes]" <TekScopes@...>
To: TekScopes@...
Sent: Wednesday, April 6, 2016 8:59:21 AM
Subject: [TekScopes] Re: 2465B CAL Settings?

On mine, CAL appears appears a couple of clicks after EXER 08 probably
depending on what options you have installed. Pressing the lower MODE
button from the opening screen gets gets straight to the CAL options.

Roger




Re: 2465B CAL Settings?

Roger Evans
 

On mine, CAL appears appears a couple of clicks after EXER 08 probably depending on what options you have installed. Pressing the lower MODE button from the opening screen gets gets straight to the CAL options.

Roger


Re: TLS216 at Singer

stefan_trethan
 

Thank you for your comments.
I'm not going to buy one, but any scope with more than 4 channels is
always interesting to look at.
(1 Bit MSO options don't count.)

ST



On Wed, Apr 6, 2016 at 3:32 PM, Steve Wiseman sjwiseman@...
[TekScopes] <TekScopes@...> wrote:
Logic analysers lie about some important
stuff...)

Steve


Help with Two Replacement Parts

Tewell, Kevin <tewell.ka@...>
 


Re: 2465B CAL Settings?

n4buq
 

Sorry - that should read "...doesn't show me any CAL pages."

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "Barry n4buq@... [TekScopes]" <TekScopes@...>
To: TekScopes@...
Sent: Wednesday, April 6, 2016 8:46:52 AM
Subject: [TekScopes] 2465B CAL Settings?

According to the manual, pressing and holding deltaT and deltaV then pressing
SLOPE causes the scope to go to the diagnostics menu and that works;
however, scrolling through the menus doesn't show me and CAL pages. I'm
only seeing TEST and EXER menus. Can someone please tell me how to get to
the CAL menus?

Thanks,
Barry - N4BUQ


2465B CAL Settings?

n4buq
 

According to the manual, pressing and holding deltaT and deltaV then pressing SLOPE causes the scope to go to the diagnostics menu and that works; however, scrolling through the menus doesn't show me and CAL pages. I'm only seeing TEST and EXER menus. Can someone please tell me how to get to the CAL menus?

Thanks,
Barry - N4BUQ


Re: TLS216 at Singer

Steve Wiseman
 

Yours for only 1422eur....
<http://www.helmut-singer.de/stock/-128652307.html>
They're rather less on ebay, especially since that doesn't come with
probes.

I didn't even know this thing existed.
It looks to me like 16 real analog channels, not digital like in current
MSOs?
16 input channels at 8 bit and 2Gs, that's quite something, must be a
challenge to keep that cool.
It's got a pretty standard full-height fan blowing across the instrument,
shifts a fair amount of air, but not insane.

If you don't use them for a while, they forget some calibration and you
need to run SPC to fix it. It's a heart-stopper the first time it happens,
looks like the scope's toast, but 15 minutes later, it goes <pinggg> and
it's back on form.
I also need to run a fat 4mm ground wire from the scope (which has a 4mm
socket) to the DUT, or I get some weird baseline wander.

They're great - an honest 16 channel, 500MHz per channnel, 2GSa scope, FET
probes on all channels, with a slightly annoying UI and not-modern trace
depths. 2KPoint per channel? Input attenuators are limited, input voltage
is limited (25VPk)

(I've got 3, use them a fair amount, bought the last one just to get the
probes - there are also useful SMA converters)

There is also a video on the tube, haven't watched it yet so can't say
if it is any good:
<https://www.youtube.com/watch?v=1VyXamEvi_U>

That pretty much covered it. Worth a watch if you've not met a TLS216. I
like mine (but have other scopes for other things. If you're chasing DRAM
weirdnesses, get one of these! Logic analysers lie about some important
stuff...)

Steve


TLS216 at Singer

stefan_trethan
 

Yours for only 1422eur....
<http://www.helmut-singer.de/stock/-128652307.html>

I didn't even know this thing existed.
It looks to me like 16 real analog channels, not digital like in current MSOs?
16 input channels at 8 bit and 2Gs, that's quite something, must be a
challenge to keep that cool.

I thought some of you guys might enjoy looking at it...

There is also a video on the tube, haven't watched it yet so can't say
if it is any good:
<https://www.youtube.com/watch?v=1VyXamEvi_U>

ST


Re: problem with parametric measurements on 2445B

John Ferguson
 

good idea. I'll try it. thanks much, john

On 04/05/2016 09:04 PM, Lee Vogt @Greenie [TekScopes] wrote:

You may have try without the scope terminated with the 50 ohm internal
termination switch on.

Sent from my Verizon Wireless 4G LTE DROID

"john jferg977@... [TekScopes]" <TekScopes@...> wrote:


Let me try this question again. I have a 2445B. If I feed a 400 Hz Sine
wave into it at 10 volts from my FG501, I can measure both voltage and
frequency with the Cursors. If i try the MEASURE button and pick Volts,
I get a reasonable response. If I try for frequency, I get a note "CH1:
SMALL OR LOW REP RATE SIGNAL"
and,of course no frequency.

I thought I might have some other setting wrong so I read the manual
again, set offset to Minimum and tried everything else I could think of,
but no joy. Rise time and Fall time show same "small or low rep rate"
error message.

I get no errors on the POST, and as nearly as I can tell everything else
works.

Am I doing something wrong, or does my scope need some work?

John




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