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Registered Member #60240
Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
Hi Hazmatt_(The Underdog)
Here are images of parts of the DSA602:
Defective component, 0.6 uF X, is removed.
Second same component still intact. As you can see the value of the cap of the DSA602 is 0.6uF X.
Small filters
As you can see the value of these caps of the DSA602 is 0.015uF
Images of parts of the DSA602A:
Second same component still intact As you can see the value of the cap of the DSA602A is 0.6uF X2.
Small filters As you can see the value of these caps of the DSA602A is 0.015uF
Hello Johnny10
The pictures are showing views of boards from DSA602 (3) and DSA602A (2).
The pictures 1,2 and 3 of my last post show different views of the first power supply board of the DSA602. The pictures 4 and 5 of my last post show the analog views of the same power supply board of the DSA602A.
For me it is remarkable that the same capacitors RIFA 0.6 uF X and RIFA 0.6 uF X2, both on the upper left of the boards, and also ONLY these, are fumed in these different oscilloscopes DSA 602 and DSA 602A, randomly?
I must also admit that this incident was my first encounter with this type of interference suppression capacitors.
Registered Member #30656
Joined: Tue Jul 30 2013, 02:40AM
Location: UK
Posts: 208
The clear caps are notorious for dying, especially after not being used for some time. It is not random or particularly surprising.
Replace every one with a modern equivalent - will not be difficult or expensive, and they are not likely to have killed anything else except by smoke or fire damage.
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
The storage history of old electronics is important. Also insulation tests, using meggers, can predict the moisture content of high voltage circuits but require very careful analysis.
If you have set diodes alight, what damage has been done to the transformer winding ?
Also, enameled copper wire has a limited insulation lifetime, from the moment it was wound on a core. Copper is so reactive, it eventually destroys the integrity of the insulation. Aluminum wound coils are much better, for obvious reasons.
You might consider using an arcing fault circuit breaker on the test bench.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
Never knew that! I wonder if this is the reason why old HDDs eventually just fail? Seen this a few times, the actuator does not move yet nothing obvious is wrong.
Registered Member #60240
Joined: Mon May 16 2016, 07:01PM
Location:
Posts: 304
To all DSA602 and DSA602A owners
Please which DSA602 and DSA602A owner has already had its device open and can tell me something about the wiring of this board just next to the power supply?
It is about the two-pole white plug, the third from the left bottom, with the two cables red and brown. In my DSA602A it is present, in my DSA602 it is missing.
I wonder now, due to a lack of circuit diagram, whether it has to do with the power supply of the floppy disk drive in the DSA602A. The DSA602A has one, the DSA602 has none.
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Smoke und fire after switching on old electronics TEK DSA 602
