Tektronix Oscilloscope 465B Video #1 of 2 - Trigger Trouble
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- Опубликовано: 12 сен 2024
- My Tektronix 465B oscilloscope will no longer trigger and produce a stable display. I've decided to investigate in hopes of finding a simple problem that I can fix.
Hello Jim: First that scope is NOT a digital scope, it is ALL ANALOG. Secondly do NOT concern yourself with the delayed function as you have to set up the scope correctly first.
Read the OPERATORS MANUAL first. You will not find much info on how to setup the scope initially in the service manual. Do NOT concern yourself with using the EXTERNAL trigger option either.
Set up an audio signal. select channel 1, plug probe into channel 1 start with the SLOWEST horizontal trace and use the verniar control, (red inner knob) to slow down the sinewave.
then adjust the lower right trigger controls to stabilize the sinewave, I believe you can select to trigger on increasing slope or decreasing slope, then adjust trigger sensitivity control.
Also make sure your horizontal centering is equal on both sides!! Good Luck.
Triggering is beyond your skill level and ability. The fixes are only known by factory trained trained techs. You need a better scope troubleshoot the scope in question.
My old Tektronix scope has a trigger problem on "A trigger" too. So I just use "B trigger". Someone told me this is a common problem. He also told me it is caused be a bad tunnel diode in the trigger circuit.
Subscribe. Don't adjust anything just find the bad part
Hi Jim
Look for the easy fix first .
The power supply is normally the problem .
Start by looking at the main capacitors .
Heat damage is the can top or plastic sleeve deformed .
Has it leaked or vented .
Test the ESR .
Has a glue been used under the caps for pcb mounting ?
Some glues degrade becoming conductive over time .
The glue started out light cream & turns dark brown as it degrades .
Test voltage rails at the provided test points or outputs .
You’ve just left the land ofnsimplicity. Welcome to- vintage High Tech electronics. Use your eyes, eats and nose.
Check your test point voltages and ac ripple. If the caps are bad and allowing high ripple you can see numerous issues.
Hello Jim Resistencias abertas por incrível que pareça apresentam valores incorretos obviamente convem eleminar essa hipótese em todas desde a entrada test mesmo tendo a certeza absoluta que não seriam essas
No serviceable parts inside - Please refer to a qualified technician !!!
@StillCloser: And we gonna miss all the grinding, drilling, bending, twisting, the excitement of a SDR "alignment" and blaming Tektronix for design errors and poor factory assembling? Disabling options he can't repair nor understand? And finding all those pesky "distortions" and calibration performed with junk yard test gear? And liberal flooding with WD-40? Cold solders galore? Mistaken replacement value components? And the fanfare of a great finale "good enough"? Please StillCloser,, reassess your statement! :)
@@ableutopia2721 The question is, if he can't follow simple steps to align a multi band tube radio, how does he expect to follow a complex and precise procedure such as aligning a Tektronix scope? I still remember his attempts to repair solid state radios, with remarks such as "Hum... this transistor has 3 legs..." ROFL