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Hello all, I am needing help.
My Tektronix TDS 320 developed a bad symptom. After some time in the bench without use (nor connected to mains) I turn it on yesterday and find out that the TEK initiate the power on sequence and then start to do several clicks from the relays inside, but can't...
Brad,
Yesterday, tinkering with the chip I found that a light pressure in a specific spot (right between the k of tek word and the u of the us word, check the chip pic) would bring on the CH2 trace.
So yesterday night I made a jig with some barbecue wood sticks and installed it in a...
Brad,
Did you read my updates above, my recent findings change all the scenario of analysis of the problem.
I would like to know your opinion/thoughts in regard to the recent findings.
Thanks.
UPDATE!!!
I found that I don't need the ice cube to recover the CH2 trace, I just have to press down the chip with all my thumb.
I try to press down the chip mainly in its four boundaries with no avail, also try to press down the pcb board with the pressure point near the chip also with no...
Brad,
Your answer was like a cold water bath :cry:
I press, I flex, I twist with no avail.
But when I am using the ice cube, I have to press down the ice firmly and a good couple of seconds in order to bring back the CH2 trace in the display, which lead me to think that something was loose...
Brad,
New info!
I measured the voltages of each pin of the chip and working with a cube of ice I found that the problem is associated with the voltage of pins 30 and 31 (check the pic attached)
The voltage of the pins change from -0.04V to +0.37V(pin 30) and simultaneously from -0.43V to...
]As far as I understand it, the scope has arrived in a pristine status, very well packed, with no signs of internal tinkering.
The component you point is a strange one, it look like a fat capacitor but with its thin terminals and red sides its different from the other smd caps...
Brad, You're the man!
Thank you for your time.
Using an ice cub inserted in two plastic bags, I found the apparent culprit.
Here it is, surrounded by a red circle:
Now, If the chip is performing its tasks but is becoming hot, this could indicate an increased voltage as power supply or...
Following your ideas, I remove the main board from the scope and gave it a good cleaning with ethanol, followed by deionized water and some time under the sun to dry it out.
Reassembled the scope and, sadness, the CH2 trace goes up in a question of seconds.
A couple of hours later, power on...
Thank you Albert for your reply.
No, I don't have a schematics of the scope, I do have the service manual. The manual has some flowcharts and describe how the things work, but has no TP voltages, nothing that can help me solve this puzzle.
I own the scope since last wednsday ( bought it for my...
Here it is a video of the running CH2 trace: https://youtu.be/Lsc5KPiC5Z0
I hope it shed more light about the problem.
For now will read your post again and report back. Thanks.
Brad,
CH1 and CH2 work well till the moment CH2 trace oscillate and goes up.
The scope CH1 works flawlessly, even when the CH2 trace goes way, CH1 work well, it looses sync when triggering is attached to CH2.
After CH2 goes up, I change triggering to CH1 and the scope exhibit the CH1 curve...
I miss your post by very little.
I open the scope and disassembled the frontal panel, found two smd electrolytic 33uF caps. One had the terminal solder joint corroded, the other look all right.
Some electrolytic fluid was visible in the area of the "waveform off" button (in the other side of...
Thank yo for your reply.
1. It seems so, the scope is a digital one and the trace goes up with little disruption if any. CH1 trace stays untouched although it seems perhaps more noisy.
2. It seems to maintain the brightness as it goes up.
3. Yes, I did and check the boards for bad...
Hello,
New here but in need of your help.
I bought a used Tek TDS320 to play with (brand "new" , no errors in the scope log), I was using dual trace to see a video signal with 1 byte coded in line 10 in order to program an arduino to do video telemetry.
And had ch2 to check for the output of a...
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