Search found 61 matches

by fenugrec
April 12th, 2018, 1:36 pm
Forum: Other or Discontinued Oscilloscopes
Topic: TDS520 problem ( Attn/acq interface )
Replies: 22
Views: 3337

Re: TDS520 problem ( Attn/acq interface )

Good, glad to hear you managed to fix it.
by fenugrec
April 3rd, 2018, 10:52 am
Forum: Other or Discontinued Oscilloscopes
Topic: TDS520 problem ( Attn/acq interface )
Replies: 22
Views: 3337

Re: TDS520 problem ( Attn/acq interface )

This is for U624.7 (CCATN) and U629.5 (ATTNSB)... Not good :( This is the next to must check ( U1324 ) ? U1324 ?? Why ? You checked the inputs of U624 and U629, and they look probably OK. You then checked the outputs of U624 and U629, and they look bad. What are the 2 possibilities that would expla...
by fenugrec
March 30th, 2018, 7:18 pm
Forum: Other or Discontinued Oscilloscopes
Topic: TDS520 problem ( Attn/acq interface )
Replies: 22
Views: 3337

Re: TDS520 problem ( Attn/acq interface )

Element of supply to U629 and U624 is ... ? Do you mean - what pin # are their supplies ? that's in their datasheets; on the schematics too; usually 7 and 14 on 74xxx logic ICs. - where the +5V is generated ? you'll have to look at the pin assignments for the connectors - probably J101. - if you me...
by fenugrec
March 29th, 2018, 4:15 pm
Forum: Other or Discontinued Oscilloscopes
Topic: TDS520 problem ( Attn/acq interface )
Replies: 22
Views: 3337

Re: TDS520 problem ( Attn/acq interface )

michanio91 wrote:
March 28th, 2018, 10:37 am
How i Can look +5.1V and +5V voltage for U624 and U629 ? Which one elements ?
I don't understand your question...
by fenugrec
March 27th, 2018, 8:54 pm
Forum: Other or Discontinued Oscilloscopes
Topic: TDS520 problem ( Attn/acq interface )
Replies: 22
Views: 3337

Re: TDS520 problem ( Attn/acq interface )

Can i try something else ? Yes. Connect to the service console port and look at the output during boot. Are those "pu_diag ..." errors recent ? "pu_" means "power-up" of course, but are you getting a new error on every boot ? Also, to state the obvious, *everything* needs to be connected inside the...
by fenugrec
March 21st, 2018, 9:31 pm
Forum: Other or Discontinued Oscilloscopes
Topic: TDS520 problem ( Attn/acq interface )
Replies: 22
Views: 3337

Re: TDS520 problem ( Attn/acq interface )

ATTNSTRB and CCATTN Those should be 0/5V TTL signals. I think your mini scope settings are wrong : 5us/div is way too fast, and 5mV/div will not show 5V excursions (way off screen). Try maybe 50-300us/div, 2V/div, and turn the scale control back and forth until your mini scope gets a good trigger (...
by fenugrec
March 21st, 2018, 9:18 pm
Forum: Other or Discontinued Oscilloscopes
Topic: 2445A Channel 1 & 2 no Vertical
Replies: 1
Views: 305

Re: 2445A Channel 1 & 2 no Vertical

Any input on what I need to look at? The schematics, for starters. You're in the lucky position of being able to use ch3/4 to self-troubleshoot the scope ! Apply a signal (cal testpoint on the front panel is perfect) to both one good and one bad channel; follow the signal path and compare identical...
by fenugrec
March 20th, 2018, 2:31 pm
Forum: Other or Discontinued Oscilloscopes
Topic: TDS520 problem ( Attn/acq interface )
Replies: 22
Views: 3337

Re: TDS520 problem ( Attn/acq interface )

Ok, but do you get to the normal display with traces etc ? I have a traces ,but they are bad. Ah. Still, a good place to start. Start by trying the flowchart in the SM page 9-1 "A15 att board programming troubleshooting". Note, you will maybe need a second scope to verify some signals. I dont have ...
by fenugrec
March 20th, 2018, 11:50 am
Forum: Other or Discontinued Oscilloscopes
Topic: TDS520 problem ( Attn/acq interface )
Replies: 22
Views: 3337

Re: TDS520 problem ( Attn/acq interface )

The Self test, when the osciloscope starting. Ok, but do you get to the normal display with traces etc ? Where i can read more information on my error ? The osciloscope have this function ? Yes, if you connect to the internal "service console port". There are a number of threads on this forum about...
by fenugrec
March 20th, 2018, 10:44 am
Forum: Other or Discontinued Oscilloscopes
Topic: TDS520 problem ( Attn/acq interface )
Replies: 22
Views: 3337

Re: TDS520 problem ( Attn/acq interface )

I have problem with my TDS520. The test say : Attn/acq interface. What test ? Does it say anything else ? Also, please describe the problem more. And I'm worried about I tried to fix it please give some details on what you did. All capacitors is ok. How have you verified this ? But the attenuator b...
by fenugrec
March 14th, 2018, 9:03 pm
Forum: Other or Discontinued Oscilloscopes
Topic: TDS544A NVRAM-Content Verification
Replies: 6
Views: 984

Re: TDS544A NVRAM-Content Verification

1) MakeFile: change CC from "/cygdrive/c/mingw/bin/gcc" to "gcc" as I used the cygwin gcc 2) make was not able to execute the "gen-procs.sh" script, I had to do it manually 3) target-procs.h: There where newlines between #define and the constant. I had to remove them manually 4) tekfwtool.c: #inclu...
by fenugrec
March 12th, 2018, 5:25 pm
Forum: Other or Discontinued Oscilloscopes
Topic: TDS544A NVRAM-Content Verification
Replies: 6
Views: 984

Re: TDS544A NVRAM-Content Verification

One thing I experienced throughout the repair: The ADCs and Preamps get really hot. I had to make sure to apply some extra air flow. Some other users have mentioned that you should never, ever run the Acq board without forced cooling (either in-case, with fan running, or out of case but with a suff...
by fenugrec
March 8th, 2018, 7:21 pm
Forum: Other or Discontinued Oscilloscopes
Topic: Tek 5440 CRT Oscope only shows vertical beam
Replies: 2
Views: 642

Re: Tek 5440 CRT Oscope only shows vertical beam

5A18N Dual Trace Amplifier Module and a 5B10N Time Base Amplifier Module. The beam works fine, and is able to move vertically as shown in the video linked below (connected to a function generator). However, it will not show a horizontal wave. Do those units have an XY mode ? I can only offer some i...
by fenugrec
March 6th, 2018, 6:38 pm
Forum: Other or Discontinued Oscilloscopes
Topic: TDSxxx Repair Thread list
Replies: 15
Views: 40526

Re: TDSxxx Repair Thread list

Why are All links dead? Why is this not updated or deleted ? The explanation and the solution are both in the post just above yours. The forum has undergone changes since these posts were originally made The search has been much improved The search is far from perfect but it is adequate in this cas...
by fenugrec
March 6th, 2018, 4:11 pm
Forum: Other or Discontinued Oscilloscopes
Topic: Utility to read/write memory on Tektronix scopes
Replies: 12
Views: 10938

Re: Utility to read/write memory on Tektronix scopes

StaffanB wrote:
March 4th, 2018, 5:33 am
Slowly moving forward, I believe the firmware is now downloaded. If anyone is interested, I'd be happy to share (FV: 4.2.1e).
Excellent. You might consider uploading it to the KO4BB repository, if it's not there already.
by fenugrec
March 6th, 2018, 4:00 pm
Forum: Other or Discontinued Oscilloscopes
Topic: Tektronix 2215A
Replies: 1
Views: 540

Re: Tektronix 2215A

Hi, the other has what i believe is a HV issue.. the waveform only takes up half the screen width. (I'm assuming you checked all DC supply levels while the issue is present ?) I had a vaguely similar problem with my 2215 a few years ago where the vertical deflection amp had intermittent / dead trans...
by fenugrec
March 6th, 2018, 3:48 pm
Forum: Other or Discontinued Oscilloscopes
Topic: 5440 CRT Not Turning On
Replies: 5
Views: 1310

Re: 5440 CRT Not Turning On

Before even starting with the caps, have you checked the power supply rails ?
by fenugrec
February 20th, 2018, 4:47 pm
Forum: Other or Discontinued Oscilloscopes
Topic: 5440 CRT Not Turning On
Replies: 5
Views: 1310

Re: 5440 CRT Not Turning On

A few pointers to get you started...
- find schematics / service manual.
- find and verify power supply test points. *caution* ! CRT voltages are dangerous. Even with the unit off : capacitors don't discharge instantly, so watch those probes.
by fenugrec
February 16th, 2018, 7:20 am
Forum: Other or Discontinued Oscilloscopes
Topic: Utility to read/write memory on Tektronix scopes
Replies: 12
Views: 10938

Re: Utility to read/write memory on Tektronix scopes

Hi, Just to be very clear: for a 16 bit word, data is sent as [7..0] [15..8] no - big endian is the "sane" encoding, i.e. the number 0x3E8 (1000 d) is stored as 0x03 then 0xE8. Don't worry about the individual bits, it doesn't matter. 32-bit numbers, similarly, are stored left to right. So 1 million...
by fenugrec
February 13th, 2018, 2:42 pm
Forum: Other or Discontinued Oscilloscopes
Topic: Utility to read/write memory on Tektronix scopes
Replies: 12
Views: 10938

Re: Utility to read/write memory on Tektronix scopes

Hi, I would like to make an attempt at writing the simpler parts of Tektool in VBA. But why VBA ! bleh... I guess there shouldn't be a need for a scope to be connected (except for read, possibly), just a running Tektool and some kind of debug tool (NI?). Even better : the source code should be prett...

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