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Shown at the top of the picture is the most common sequence used for Beta machine testing, alignment and repair. We are going to be adding some steps along the way because our goal is to completely refurbish our Beta. These will be in addition to correcting any tested malfunctions we will find. Our goal is to make the machine as close to new as possible. Referring to the chart above it should be recognized that if the unit is not BetaHiFi then the last step on the lower right would not be performed. Also some units may require additional checks and tests, depending on any special features they have or other considerations that may apply. If necessary the process can be done in a slightly different order if a particular problem demands it, but the overall purpose in referencing the graph is to insure that each gets performed. This aids in eliminating unnecessary repetition, trouble, headaches and labor. Refurbishing our Beta is going to be time consuming and labor intensive, so whatever we can do to make the process more efficient and easier is desirable. In the lower half of the picture you see the first step, which is using a volt-ohm meter (VOM) to check the power supply section and validate that it is producing the required voltages for the unit to operate. A similar check, performed with a frequency counter or scope, is checking and adjusting the systems clock (or clocks). These are not the clocks you are used to seeing, the ones that display the time (that gets its reference count off the AC line). These type clocks are the ones used by the Integrated circuits for counting the amount of microseconds it takes to perform a function, such as in loading a tape. Using a regulated frequency count allows the IC circuits responsible to know if this function was performed successfully in the pre-programmed time allowed. (It would get its proof of the successful function by receiving information back from a strategically located end-of-function switch.) If loading should develop a problem and take too long, the function IC would discover this then execute a stored routine for reversing the loading action and try to get the tape back out. You can see why clocks are important and why if they fail everything can go haywire. If problems are found in either of these two systems it would probably involve parts replacement, adjustments aren't routinely provided. The various procedures, meter readings, scope photos, charts, adjustments, and all of the representations shown throughout this refurbishing discussion are of a general nature and are for description only. The actual tests, repairs and refurbishing would vary depending upon the model, features and condition. The data illustrations above and seen in future steps are take from various service manuals, scope photos are taken off the screen during the related test. Now let's move onto the next step, which is SET UP AND REFERENCE CHECKS, click here. To go back to the previous page click here. To close this panel and go back to the main page click here   |