Electronics > Repair

TDS3014 adventures

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Galen:
My third TDS3000B, acquired as dead machine, blank screen, no response to any key.  I guess this is very possible caused by the oscillator. So I bought them. when I measure the out put of the crystal out put, no signal. My normal TDS3012B has 75.757M output. so definitely, this oscillator is dead. then I found it was soldered in wrong direction. check the other oscillator (48M), wrongly installed as well. and both frequency are wrong. 
I bought 2 oscillators and they arrived today. replaced the wrong oscillators. power on the scope, wooo, it boot up normally!
Then I do some measurements. it functins well.
But, it always has a but, I can't find a 75.7575 oscillator, now using a75M, it works well. only the frequency measurement reading is a little wrong, for the 1K square wave, it shows 1.010K.  This is obviously because of the 75M oscillator.
Now I need to find the strange frequency 75.757 oscillator.
BTW, this scope also missed the handle anchor assembly, and the trigger level potentiometer broken. Will try to repair them.
Anyway, already a happy success.  it's time to have a beer.

AlcidePiR2:

--- Quote from: james_s on September 29, 2019, 06:04:51 pm ---Anyway I desoldered the chip and installed a socket, then popped it in my TL866 and read it as an EEPROM saving the contents to a file.


--- End quote ---

hi James

Which setting ( which chip) did you use for the reading of the DS1742 on the TL866 ?

Thanks

madao:

--- Quote from: AlcidePiR2 on June 20, 2020, 02:10:55 pm ---
--- Quote from: james_s on September 29, 2019, 06:04:51 pm ---Anyway I desoldered the chip and installed a socket, then popped it in my TL866 and read it as an EEPROM saving the contents to a file.


--- End quote ---

hi James

Which setting ( which chip) did you use for the reading of the DS1742 on the TL866 ?

Thanks

--- End quote ---
DS1220 Setting  (both is  2k x8 NVSRAM, which  DS1742 has included  timekeeper.)

AlcidePiR2:
This is what I did, but  I had an error message when I try to read.

Now I have tried again and realized my mistake.  I had not properly mounted the device. Now everything is fine .

I have attached the .hex file here

I hope this is fine.

I still have two questions :

- Is there a way to know the level of the battery without opening the case ?
- Where can I find a picture of the inside to know where to drill if I want to hook some wires and external battery ?

Thanks

giosif:

--- Quote from: giosif on June 20, 2020, 08:51:48 am ---Was looking inside the scope again this morning and noticed something I hadn't before: is it just me or the flex cable going from the Ethernet board to the main board is awfully close to those two resistors that are known to get toasty when the scope if turned off (see pictures)?

Now, I have done a continuity check on that flex cable as part of my initial troubleshooting, and all checked ok then, but that was with the cable outside the scope, sitting on a flat surface.
I wonder...

--- End quote ---
Just to provide an update here that the Ethernet connectivity issue turned out to be caused by corrupt NVRAM - speaking of which, one way to detect that is if the MAC address of the scope's Ethernet adapter shows in the configuration screen as 08:00:11:01:02:03.
I obtained an NVRAM dump file from another scope and used it on this scope and now network connectivity has been restored.  :-+

Thanks to users YetAnotherTechie and Galen on the forum here for their help sorting this out!

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