Author Topic: Tektronix THS7xxx Scope Hack/Teardown/Discussion - FW 1.16 found  (Read 73956 times)

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Offline little_grey

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Re: Tektronix THS7xxx Portable Scope Hack/Teardown/Discussion
« Reply #175 on: July 24, 2017, 11:52:56 am »
finally got mine delivered and done a quick signal input test and reminding myself how the OS works.
Got the case and manual and what appears to be a fairly good battery for £230 so dont feel too out of pocket for it.

admittedly not the best bargain, the HP signal generator was £22 from a charity shop :D



i have some testing to do on coil and injector drivers later so i'll give it a proper working test later.
« Last Edit: July 24, 2017, 11:57:51 am by little_grey »
 

Offline grinch

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Re: Tektronix THS7xxx Portable Scope Hack/Teardown/Discussion
« Reply #176 on: August 11, 2017, 08:58:10 am »
Just my 2 cents. Original ths720 std power supply. Nothing special inside: rectifier bridge, resistor and capacitor:







« Last Edit: June 29, 2018, 12:14:54 pm by grinch »
 
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Online Zucca

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Re: Tektronix THS7xxx Portable Scope Hack/Teardown/Discussion
« Reply #177 on: August 11, 2017, 09:37:18 am »
Thx grinch, cheap ass stuff there...

that said, what would you want to achive once you have dumped the chip?

Upgrading to 1.16, If some gentleman will then dump out the 1.16 FW

and then reverse eng... something like this, checking and comparing the EPROM data

https://www.eevblog.com/forum/repair/quick-repair-standford-research-ps350-5kv-5ma-(fixed)/
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Offline SMdude

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Re: Tektronix THS7xxx Portable Scope Hack/Teardown/Discussion
« Reply #178 on: September 07, 2017, 01:12:53 pm »
Hey, just curious, has anybody tried to run one of these scopes from 8.4v from the battery input?
Looking at the schematic, I can't see a reason why it would not work as the 12v wall adaptor ends up feeding the same supply much higher than 4.8v.

Sure the built in charger won't work, though it could be modified for a higher output voltage, however the charger is really a mute point as I could contain one in the batt pack.

What I am thinking of doing is making a li-ion pack with 2 18650's  in series to get 8.4v with a built in 12v charger. I would use a piece of pvc pipe to house everything(without measuring, it looks about the right diameter).

The 15hr charge time for the ni-cd pack doesn't really turn me on, and it would be inconvenient to have more than one ni-cd pack as you'd be forever waiting for batteries to charge.

Cheers
 

Online Zucca

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Re: Tektronix THS7xxx Portable Scope Hack/Teardown/Discussion
« Reply #179 on: September 07, 2017, 01:29:22 pm »
Hope you can make your dream true. I wasted some time for exactly the same mod, but after I swapped the terrible aged Tek battery with news one (see some posts above) I was pretty happy and called it done deal.

Looking at the schematic, I can't see a reason why it would not work as the 12v wall adaptor ends up feeding the same supply much higher than 4.8v.

I see some components beetween the batteries pack and the 12VDC, so I will not be so 100% sure.
Easy test: take the battery out and feed the scope with the 12VDC jack, then measure the voltage at the empty batteries pack terminals. You will have the answer...

Be careful not to cook your scope with 8,4V experiments.

« Last Edit: September 07, 2017, 01:33:00 pm by zucca »
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Offline SMdude

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Re: Tektronix THS7xxx Portable Scope Hack/Teardown/Discussion
« Reply #180 on: September 07, 2017, 01:38:36 pm »
Well, at the output of the si9435(fet directly after batt pack), the voltage will be 1 diode drop below 12v.

Looking at everything else around there, I am feeling game. (almost)

Might take a smps and slowly ramp up the voltage while measuring current and see what happens.

Will let you all know what I find..

Cheers
 

Online Zucca

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Re: Tektronix THS7xxx Portable Scope Hack/Teardown/Discussion
« Reply #181 on: September 07, 2017, 02:04:12 pm »
Cool, yeah just ramp up the voltage at the batteries terminals and watch i.e. the scope 5V power rail if it will rise up above 5,5V I will call it a failed try....
« Last Edit: September 07, 2017, 02:07:47 pm by zucca »
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Offline little_grey

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Re: Tektronix THS7xxx Portable Scope Hack/Teardown/Discussion
« Reply #182 on: September 07, 2017, 02:32:29 pm »
i think i am with Zucca, for the price, i think i'll ether buy a complete replacement or replace the internal cells. that said my battery is not too bad at the moment.

if you are planning on running at a lower voltage are you going to be continually harassed by the low power warning? (might be missubnderstanding here)
 

Offline SMdude

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Re: Tektronix THS7xxx Portable Scope Hack/Teardown/Discussion
« Reply #183 on: September 07, 2017, 02:55:17 pm »
Nope, going for 8.4v as I have li-ion coming out of my ... shed!

Looking at the schema a bit further, I am very confident that this will work without any problems, just making the insert tube with the contact, then I will give it a try.

Grabbed myself some of these bms circuits(you should always use a bms with lithium) :
http://www.ebay.com/itm/2X-2S-3A-7-4-8-4V-Li-ion-18650-Lithium-Lipo-Battery-BMS-Protection-Board-PCB-EP/222612744056?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649

And will be using a tp5100 charger board :
http://www.ebay.com/itm/2-cells-single-Lithium-ion-Battery-Charger-Module-1-2A-PCB-18650-TP5100-iphone-/171753145841?epid=1053965105&hash=item27fd4905f1:g:eL0AAOSwPhdVK8yD

With a 2.1mm dc jack,  and same polarity as the one that supplies the scope.

Will post more tomorrow arvo, late here now.

Cheers
 

Offline SMdude

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Re: Tektronix THS7xxx Portable Scope Hack/Teardown/Discussion
« Reply #184 on: September 08, 2017, 03:59:43 am »
Well, it works!
They have no problems running from 8.4v at the battery input.

Now to wait for the bms.

It's a bit rough, however it does the job.
Note to self, don't attempt to board a plane with it!  :-DD

Cheers

Ps, will let you know if the smoke comes out...

Pps, The low batt warning won't work unless it is modified for the higher voltage, but unless I have to pull it apart, CBF
 

Online Zucca

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Re: Tektronix THS7xxx Portable Scope Hack/Teardown/Discussion
« Reply #185 on: September 08, 2017, 08:10:38 am »
 :clap: :clap:

Battery C Size measures 50 millimetres (1.97 in) length and 26.2 millimetres (1.03 in) diameter. So the Tek Battery pack is about 20cm with 26.2 mm diameter.
A 25500 Liion Battey is about the same size as a C cell.

How about then 3x25500 in series... will the 12,6V burn up everything?  >:D Probably yes...

I found some 25500 with already the BMS integrated which is nice...
One questions... with 8,4V how much current does the Scope need?
I mean at 4,8V it needed 1.2A when full on (with backlight)... so at 8,4V maybe 1,2A*4,8V/8,4V=686mA? Probably yes..

wait with 12VDC on the charger jack it need about 500mA with no batteries attached... so probably it needs about 6W-5,8W (with backlight on!!!) to operate...  the rest is just math...

So quick battery life check:

2 18650 in series 3100mAh (SMdude mod)
3,1Ah/5,8W*(3,6V*2)= 3,84h

2 25500 in series 4000mAh
4Ah/5,8W*(3,6V*2) = 4,96h

3 25500 in series 4000mAh
4Ah/5,8W*(3,6V*3) = 7,44h

Now since according to my old post the 4 C-Size cell are lasting 2,96h you will get 3,84-2,96= 52 minutes more with the 2x18650. Which is nice, but I personally think it is not worth the effort unless you really need the quick charge feature.... and all the Liion bat goodies.

Much more interesting are the configurations 2x25500, and the porno dream will be the 3x25500 (it will last probably one business day and then the night comes where you will charge it)...

EDIT: a 26650 size is also very interesting.
« Last Edit: September 08, 2017, 03:13:20 pm by zucca »
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Online Zucca

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Re: Tektronix THS7xxx Portable Scope Hack/Teardown/Discussion
« Reply #186 on: September 08, 2017, 09:43:57 am »
I couldn't resist... according to my reverse eng... schematics page 15, near U55

R151/R153=Vlow/1,5V-1

Low Battery Liion warning mod... assuming 3,5V / Cell as trigger for the warning...

with 2 Liion
---> mod R151 with a 174,1KR
or
---> mod R153 with a 27,2KR

with 3 Liion
---> mod R151 with a 285KR
or
---> mod R153 with a 16,6KR



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Online Zucca

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Re: Tektronix THS7xxx Portable Scope Hack/Teardown/Discussion
« Reply #187 on: September 08, 2017, 03:19:24 pm »
Alleluja

http://www.ebay.de/itm/TangsFire-2pcs-6800mAh-26650-3-7-v-Lithium-Ionen-Akku-mit-PCB-Board-V1M4-/262876079813?hash=item3d34a2a6c5:g:zpoAAOSw~AVYtuvP

13,33€

2 26650 in series 6800mAh
6,8Ah/5,8W*(3,7V*2) = 8,67h

now we are in business, BUT I think the 6800mAh could be fake
« Last Edit: September 08, 2017, 03:21:11 pm by zucca »
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Online texaspyro

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Re: Tektronix THS7xxx Portable Scope Hack/Teardown/Discussion
« Reply #189 on: September 16, 2017, 01:02:56 am »
A few days ago I came across a THS730A battery pack that I built over 10 years ago using NiCd cells.   I never really used it since I had also built one out of 4500 mAh low-self-discharge Nimh cells (and that pack is still working).  A quick check showed the NiCd pack was toast, so I decided to rebuild it using NiMh cells.  A quick trip to the battery store found some 5000 mAh Imedieon low self discharge cells for a decent price ($25 / 4).  I've used Imedion cells for a long time and they work very well.

I rebuilt the NiCd pack (the way I built it,  just slid the old cells out of the mylar sleeve and slid in the new cells).  Then I went to test it in the scope.  I had some difficulty opening the battery door... WTF?  Turns out the door was broken.  The metal disk that connects the battery positive to the scope is held to the black plastic door with four TINY heat staked pins.  Three of the four had sheared off at the plastic knob.  I suspect that this will be a common failure mode.

So, I emailed Tek about a replacement door...  no joy... no longer available... support ended in 2012.

So I fixed the door / contact disk using IC2000 tire cement.  This is a rubberized superglue used to glue tires to wheels on RC race cars.   It is not brittle like regular superglue.   First I cleaned the metal disk and plastic knob with alcohol (190 proof Everclear grain alcohol is my cleaner of choice... non-toxic (in moderation) and it also makes a great screwdriver...  if mixed with orange juice and milk of magnesia is that a Philips screwdriver?). 

Next I scuffed up the back of the disk and the back edge face of the knob with rough sandpaper.  Then I applied a bead of IC2000 around the face of the plastic knob.  Finally, very carefully, I centered the disk on the knob.  Having one heat stake post still attached to the knob helped with centering the disk.  The battery door now works better than it ever did.   Unfortunately the little cloth tether that keeps the battery door attached to the machine has disappeared.  A little kevlar thread and some more IC2000 fixed that.
 

Online Zucca

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Re: Tektronix THS7xxx Portable Scope Hack/Teardown/Discussion
« Reply #190 on: September 16, 2017, 05:10:28 am »
If you look back you can find how I modified my battery pack.
I remove the metal disc intentionally and sandwich with hot glue some solder wick.
It's holding like a champ, I have then a wire for the positive pole and don't need the cloth tether.

Good to know about the IC2000.
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Online texaspyro

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Re: Tektronix THS7xxx Portable Scope Hack/Teardown/Discussion
« Reply #191 on: September 16, 2017, 01:14:20 pm »
I found the tether... it had slipped back in to the case and was hiding in its little cave.  A bit of shaking and tweezing coaxed it out.  I tacked it down to the metal disk with a drop of IC2000.   You do have to be a little careful closing the battery door.  The top of the brass strip is just folded over the edge of the battery.   The tether likes to settle between the battery positive terminal and the brass strip that runs down to the ring at the base of the battery stick.
 

Offline patpat

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Re: Tektronix THS7xxx Portable Scope Hack/Teardown/Discussion
« Reply #192 on: October 11, 2017, 05:10:47 pm »
My approach for using regular Eneloop Pro and spacers (or C size batteries) w/o altering the scope.
The Eneloops fit tight but I was able to close the lid w/o problem.
Now my THS730 works on regular AA (with spacers) or C sized batteries

This mod is good if do not need to change bateries very often.

Best,
Patrick
« Last Edit: October 11, 2017, 05:13:58 pm by patpat »
 

Offline jal1234

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Re: Tektronix THS7xxx Portable Scope Hack/Teardown/Discussion
« Reply #193 on: December 16, 2017, 11:49:08 pm »
I just replaced both polarizers on my LCD on my 720A that was illegible before I did it. I describe the process and what I used to do it at the end of this thread:

https://www.eevblog.com/forum/index.php?topic=53184.msg1376800.msg#1376800

Sent from my Nexus 5 using Tapatalk

 

Offline hardcoreman

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Re: Tektronix THS7xxx Portable Scope Hack/Teardown/Discussion
« Reply #194 on: December 31, 2017, 07:36:35 am »
hello, any progress with dumping firmware? :) i looking for 1.14 or 1.16.

i want try 710 to 710a mod. now i have working 710 to 720 v 1.03.

 flash size is same, pcb components same....
 

Offline patpat

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Re: Tektronix THS7xxx Portable Scope Hack/Teardown/Discussion
« Reply #195 on: January 06, 2018, 02:34:57 am »
I'm also interested in getting a FW dump.
I think J1 is the Fujitsu FCN-244M080-G/0
then we would need the female version of it i.e. FCN-244F080-G/0
Is anyone able to confirm this? I'm attaching the connector datasheet.

I also think the EPROM reader used by Zucca is not the right tool;
if we want to avoid a custom reader we should probably think of
something like i.e. the CONITEC GALEP-5 (Script Controlled) programmer,
controlling reading speed, uP HALT line, etc.
« Last Edit: January 06, 2018, 07:08:17 pm by patpat »
 

Offline hardcoreman

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Re: Tektronix THS7xxx Portable Scope Hack/Teardown/Discussion
« Reply #196 on: January 07, 2018, 11:23:15 am »
original on pcb is AMP brand...

but FCN-244M080 have same dimensions...
 

Online Zucca

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Re: Tektronix THS7xxx Portable Scope Hack/Teardown/Discussion
« Reply #197 on: January 07, 2018, 10:51:35 pm »
I have stopped the project because I am helping a friend of mine with a big project.
My plan is still to desolder the U1 and read it with the TL866, no more time wasted in the J1 jazz for me.

How many of you are waiting a FW dump? If a lot are interested I will reorganize my Todo list.
« Last Edit: January 07, 2018, 10:53:35 pm by zucca »
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Offline patpat

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Re: Tektronix THS7xxx Portable Scope Hack/Teardown/Discussion
« Reply #198 on: January 07, 2018, 11:42:35 pm »
If I were you I would not remove the connector, why would you do that?
<EDIT>sorry you mean removing the memory. my mistake.
If you can carefully do that sure will produce better results.
What I wrote next could be useful if you decide not removing the chip.
</EDIT>

When looking at your previous dumps it seems you have some additional problem on top of noise.
A noisy FW reading would look like a non-repeatable pseudo-random reading (68K code) but
yours does not look like reading the content of the memory at all.

You should check that the control lines are really selecting the "read mode" See
Table 1. Am29F080 User Bus Operations

Read Mode
The Am29F080 has two control functions which must
be satisfied in order to obtain data at the outputs. CE is
the power control and should be used for device selection.
OE is the output control and should be used to
gate data to the output pins if the device is selected.
Address access time (tACC) is equal to the delay
from stable addresses to valid output data. The chip
enable access time (tCE) is the delay from stable addresses
and stable CE to valid data at the output pins.
The output enable access time is the delay from the
falling edge of OE to valid data at the output pins (assuming the addresses


Next you should check that the RESET/HALT sequence really "works"

If you externally fix the control lines but the reader initializes the reading mode by "writing" the "reading command"
(see table Table 5. Am29F080 Command Definitions) you might be in trouble because the reader probably
does not have complete control of the device and that could very well lead to a non responsive memory.
The reader should be able to accordingly select the writing and reading control lines; remember in order to read
the reader could initially "write" the reading command.

« Last Edit: January 08, 2018, 10:06:39 am by patpat »
 

Offline superman13

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Re: Tektronix THS7xxx Portable Scope Hack/Teardown/Discussion
« Reply #199 on: April 13, 2018, 04:11:51 pm »
Hi!

Have anyone working firmware? Tried files 1.16, 1.14 and no success all files are empty.

Please if someone have possibility to dump memory I will be grateful. Next week I will get a dump for 1.08 but is very old version.
 


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