Re: Tek 2432 & 2430A Power up fails
My 2430 needed a ¡°cold start¡± before a self cal would clear those errors.
?ann mi?., 7. ma¨ª 2025 kl. 15:18 skrifa?i Gerdy via groups.io
<gerdy_maelbrancke@...>:
toggle quoted message
Show quoted text
Update: my 2432A shows fault codes 7000 (CCD), 8000 (PA), 9000 (Triggs).
The 8000 code today joined the 7000 & 9000 codes, not sure where this
sudenly comes from.
But NO 6000 code (CKSUM-NVRAM).
Tried Calibration but it does not solve anything.
As a test I replaced the 'Keeper' Li battery (3.5V, but measures 3.6V) by
2 AA batteries (measures 3,2V).
I get another additional code now: 4000 (FPP), drilling deeper it says the
battery voltage low is the problem. Does this mean the Backup battery
voltage is very critical?
Again Calibration does not solve it.
Putting back the original Li battery in makes the 4000 code disappear
again.
At least that is consistent.
I wanted to order a new Li battery but in Europe it is not obtainable
(shipping limited to US) so what now?
I have the 2 SRAM chips (the ones that are supplied by the Li batterty) on
order but I read in the service manual that the SRAM chips are tested on
startup and I have no fault codes for that. Can I conclude safely these are
OK then?
I am a bit stuck now:
-the battery measures 3.6V, which is above the 3,5V spec. No indications
of battery voltage too high or too low. Will replacing the battery solve my
problem?
-the SRAM chips are tested on startup (walking'1' and walking '0' test). I
have 2 SRAM chips on order but will replace these solve my problem?
I also have the problem with the bulged X1 (or X2?) caps and a power
resistor that has a brownish colour, all this in the input mains filter.
Can this really be my problem?
I will definitely replace those and also measure the ESR and the value of
the PS elco's (they all look fine by the way) but so far to my frustration
I was unable to get the PS board out of the scope, I am looking at the
board but can't find how to remove it. Any suggestions?
My scope is definitely old, from 1990, but has only 4000 working hours, so
not much.
|
Re: Tek 2432 & 2430A Power up fails
On 7 May 2025, at 20:18, Gerdy via groups.io <gerdy_maelbrancke@...> wrote: ...
I wanted to order a new Li battery but in Europe it is not obtainable (shipping limited to US) so what now?
I have the 2 SRAM chips (the ones that are supplied by the Li batterty) on order but I read in the service manual that the SRAM chips are tested on startup and I have no fault codes for that. Can I conclude safely these are OK then?
I am a bit stuck now:
-the battery measures 3.6V, which is above the 3,5V spec. No indications of battery voltage too high or too low. Will replacing the battery solve my problem?
-the SRAM chips are tested on startup (walking'1' and walking '0' test). I have 2 SRAM chips on order but will replace these solve my problem?
... Have you worked though the service manual diagnostics and theory of operation? I¡¯m a bit surprised the Li-SOCl2 batteries aren¡¯t available. They¡¯re easily obtained here in the UK from various sources. Are there EU restrictions on them?
|
Re: Tek 2432 & 2430A Power up fails
Update: my 2432A shows fault codes 7000 (CCD), 8000 (PA), 9000 (Triggs).
The 8000 code today joined the 7000 & 9000 codes, not sure where this sudenly comes from.
But NO 6000 code (CKSUM-NVRAM).
Tried Calibration but it does not solve anything.
As a test I replaced the 'Keeper' Li battery (3.5V, but measures 3.6V) by 2 AA batteries (measures 3,2V).
I get another additional code now: 4000 (FPP), drilling deeper it says the battery voltage low is the problem. Does this mean the Backup battery voltage is very critical?
Again Calibration does not solve it.
Putting back the original Li battery in makes the 4000 code disappear again.
At least that is consistent.
I wanted to order a new Li battery but in Europe it is not obtainable (shipping limited to US) so what now?
I have the 2 SRAM chips (the ones that are supplied by the Li batterty) on order but I read in the service manual that the SRAM chips are tested on startup and I have no fault codes for that. Can I conclude safely these are OK then?
I am a bit stuck now:
-the battery measures 3.6V, which is above the 3,5V spec. No indications of battery voltage too high or too low. Will replacing the battery solve my problem?
-the SRAM chips are tested on startup (walking'1' and walking '0' test). I have 2 SRAM chips on order but will replace these solve my problem?
I also have the problem with the bulged X1 (or X2?) caps and a power resistor that has a brownish colour, all this in the input mains filter. Can this really be my problem?
I will definitely replace those and also measure the ESR and the value of the PS elco's (they all look fine by the way) but so far to my frustration I was unable to get the PS board out of the scope, I am looking at the board but can't find how to remove it. Any suggestions?
My scope is definitely old, from 1990, but has only 4000 working hours, so not much.
|
Re: 465 Dead HV Multiplier?
Thanks everyone. Replaced with an ECG/NTE538 and my display works again. It shouldn't matter but I left the "CTL"/"D" line disconnected rather than connecting it to input. I had to do a significant amount of cutting and grinding of the aluminum shields to fit the new part in there without crushing the nearby components, and I was worried that any aluminum dust I failed to clean up would cause problems. I also had quite a difficult time removing the vertical preamp board. The Youtube videos all have different model variants than mine. Anyone else who is doing the same thing should download the most recent version of the manual from the tek wiki. At first I was hampered by using an early manual that didn't include disassembly instructions, which are better any video tutorial.
|
Re: File /Tek TM500 Power Module Tester 067-1201-99 New Ver/Tek 067-1201-99 Power Test Module Manual v1.9.pdf uploaded
#file-notice
Heya Jared!!
Funny enough I just started soldering my tester last night!!!
Can you tell us the changes you made since the last version???
-dc
|
Re: Slightly OT: Question on commercial PCBs (such as PC computer motherboards) vs "one off" or prototype PCBs (Oshpark / JLCPCB)
On Wed, May 7, 2025 at 04:56 AM, Ed (SCSKITS) wrote:
I get a lot of bare boards from ALL PCB and JLCPCB and have never noticed them
have a smell.
I agree. That was the point I was trying to make in the original post, the bare boards I get have never had a smell... that is what lead to my question about what is different between a bare board from a board supplier and a commercial PC motherboard that has the smell?
|
Re: Slightly OT: Question on commercial PCBs (such as PC computer motherboards) vs "one off" or prototype PCBs (Oshpark / JLCPCB)
I get a lot of bare boards from ALL PCB and JLCPCB and have never noticed them have a smell.
|
Perhaps there were multiple versions of the 703H. The one I have has the characteristics of the original 453, side mounted calibrator, and smaller CRT as compared to the 453A. Internally, boards are different rev as compared to docs on the base 453, either before 20,000 or after.
|
Re: Anyone have a power entry module for a TM502 chassis? Or advice on how to repair a broken one.
I think it is the exact same part IIRC, it was a while ago and I bought my TM502 already smashed, but from memory the remaining parts of the original mains inlet looked pretty much cross compatible.
Jared
|
Re: Slightly OT: Question on commercial PCBs (such as PC computer motherboards) vs "one off" or prototype PCBs (Oshpark / JLCPCB)
When I worked in welder repair yers back, the Chinese made welders had a particular smell, I traced it down to the conformal coatings on PCB's and varnishes in the transformers etc outgassing.
Jared
|
Slightly OT: Question on commercial PCBs (such as PC computer motherboards) vs "one off" or prototype PCBs (Oshpark / JLCPCB)
Hello All,
I have done many custom hobby level PCB and circuits (four layer and two layer boards), bought thousands of components from Mouser, Newark, etc, purchased hundreds of feet of hook up wire and never once did any of them have that "strong new electronics smell" that I detect when removing a new PC motherboard from its static proof plastic bag or when opening up a new-in-box PC power supply.
I have never noticed it when purchasing brand new higher end electronic test equipment (Tektronix, HP/Agilent/Keysight, Fluke).
I have done many web searches on what the cause might be I have come across some suggestions as to what may contribute to the chemical off gassing.
- bromide based fire protection coating
- board cleaning / flux cleaning wash
- fire retardant infused hookup wire insulation (this seems a bit far fetched to me)
Anyone here involved or had experience with consumer (read as low cost / high quantity) commercial PCB and electronic manufacturing that could give some clues as to what it may be and if it is infused into the PCB / wire / components or if it can be cleaned / removed?
Thanks,
Dave
|
Re: Anyone have a power entry module for a TM502 chassis? Or advice on how to repair a broken one.
Thanks Jared! I wound up ordering the same part (Schurter brand) you suggested from Mouser after looking at all the variations and what was in stock. I also ordered an extra fuse drawer but I'm curious if the original fuse drawer fits as well? Looking at the pictures, they seem to be exact.
Jay
toggle quoted message
Show quoted text
On Tue, May 6, 2025 at 05:50 AM, Jared Cabot wrote:
On my TM502A, I used Schaffner part number 4303.1093, and for the matching
Voltage Selector Fuse Drawer I used Schaffner part number 4303.2014.01
(Just double check if the fuse drawer is included or not wheny you purchase
the module).
|
Re: Anyone have a power entry module for a TM502 chassis? Or advice on how to repair a broken one.
Schaffner is known for using the dreaded exploding Rifa capacitors, so be careful of any older Schaffner power entry modules. I found one in IIRC an HP 70000 series spectrum analyzer from the 1980s or 1990s. One would assume that both RIFA and Schaffner would have learned their lessons by now. Good luck!
Jim Ford
Laguna Hills, California, USA
toggle quoted message
Show quoted text
On May 6, 2025, at 4:45?AM, Ed (SCSKITS) <scskits@...> wrote:
?I have one with the same problem.
I now use it for a test bed.
|
Re: Anyone have a power entry module for a TM502 chassis? Or advice on how to repair a broken one.
I have one with the same problem.
I now use it for a test bed.
|
Re: vintageTEK new debugging aid
When posting an EBAY link, just post the information before the first question mark, not including the question mark.
It should still work.
|
Re: Anyone have a power entry module for a TM502 chassis? Or advice on how to repair a broken one.
On my TM502A, I used Schaffner part number 4303.1093, and for the matching Voltage Selector Fuse Drawer I used Schaffner part number 4303.2014.01
(Just double check if the fuse drawer is included or not wheny you purchase the module).
Jared
|
Re: vintageTEK new debugging aid
My CurveBug arrived today and appears to work as advertised. I'm sure it will come in handy, but I agree that having more OS support would be a plus. Dave Casey On Fri, May 2, 2025 at 10:26?AM Mark Litwack via groups.io <mlitwack= [email protected]> wrote: This sounds like a handy device, and I particularly like the the reference
and DUT inputs displayed on the screen at the same time. This is similar
to the Huntron.
However, I have to add to the other comments here that windows-only is a
non-starter for me too. John - I'm interested in your results in trying to
get this to run under WINE.
It's also possible to emulate the exact curvebug behavior with a modern
digital scope and only a couple of resistors, and using the built-in (or
external) function generator. Some scopes support waveform math as inputs
to the XY display, so the current through the resistor can calculated for
Y. And they also support multiple Y inputs (e.g., XY1 and XY2) displayed
simultaneously, so a second test input can also be displayed.
But having it in one small box is more convenient (and at $40, a lot less
expensive!).
-mark
|
Re: Anyone have a power entry module for a TM502 chassis? Or advice on how to repair a broken one.
Thanks John, I may give that a try just to see how it works.
After a bunch of digging, it looks like the correct part is still available. Schurter p/n 4303.0213 seems to be an exact fit minus the 4 way voltage selector pins. The power entry module with the 4 way voltage selector IS available but is a non-stocked part. I'll wire it up for 120V / 220V and insulate the rest.
|
Re: Anyone have a power entry module for a TM502 chassis? Or advice on how to repair a broken one.
On 5/4/25 18:22, Jay Czaja via groups.io wrote: I'm also trying to think of creative ways to secure the broken one in place (both tabs are broken) Is it plastic? You can take a flat bladed soldering iron and put the temp at 450 deg and weld plastic. To make a tab, it helps to have a slab of iron or aluminum to mold against. The heatsink effect makes the plastic freeze onto the flat surface. Then trim with cutters hacksaws nibblers etc... Hot air solder tools can be good for plastic welding also.
|
Re: Looking for rear feet for 2465 DVM scope
Jason,
Yes depending what S/N your scope is does indicate the type of fan. Best for you to remove the rear cover and you will have either the axial or squirrel cage style. The squirrel cage center collet in most scopes will break apart when you remove it. So hopefully your scope has axial style. So take a look. I have the rear feet and axial fan if you're interested.
Craig
|
Jared Cabot
Craig Cramb