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434: Difference between revisions
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Deanhuster (talk | contribs) (Edited to eliminate the "personal touch" so that the material is more easily read by those with English as a second language. Be patient! I'm on the beginning of the learning curve here.) |
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The 434 uses only two plug-in attenuators (both X10) in each channel, and most V/DIV switching involves gain switching of the preamp. The 434 often cannot meet vertical gain specifications and some very low-value 5% tolerance resistors must be replaced to correct this. These resistors are not located in an easy-to-access area of the board and once the defective resistors are identified, the board will need to be removed to allow replacement of the resistors without board damage. | The 434 uses only two plug-in attenuators (both X10) in each channel, and most V/DIV switching involves gain switching of the preamp. The 434 often cannot meet vertical gain specifications and some very low-value 5% tolerance resistors must be replaced to correct this. These resistors are not located in an easy-to-access area of the board and once the defective resistors are identified, the board will need to be removed to allow replacement of the resistors without board damage. | ||
Another common problem involves the mounting hardware for the back casting. Nearly every 434 that was received in Tektronix Service Centers had to have these mounting screws tightened. There is one located under the cover for the line cord and fuse. If that screw comes completely out, it is held captive inside that small space, and causes a lot of damage to the open mains connections on the fuse holder. This is a job for a #2 Pozidriv screwdriver and a LOT of muscle torque. Don't use a Phillips driver for this because it will "cam out" of the screw head with the torque that you must apply, causing screw head damage. Regardless of how much torque you apply, you won't strip the | Another common problem involves the mounting hardware for the back casting. Nearly every 434 that was received in Tektronix Service Centers had to have these mounting screws tightened. There is one located under the cover for the line cord and fuse. If that screw comes completely out, it is held captive inside that small space, and causes a lot of damage to the open mains connections on the fuse holder. This is a job for a #2 Pozidriv screwdriver and a LOT of muscle torque. Don't use a Phillips driver for this because it will "cam out" of the screw head with the torque that you must apply, causing screw head damage. Regardless of how much torque you apply, you won't strip the extruded aluminum rails or break the large 10-32 screws. Tighten all of these casting-mounting screws by hand as tight as you possibly can. Of course, do not use high-torque pneumatic or electric tools for this job. Especially don't use the electric impact drivers that are so popular now in the construction industry. The hardware DOES have its mechanical limitations. | ||
==Specifications== | ==Specifications== | ||