3.
For more extended maintenance, it is wise to follow recommendations for
internal inspections, checking reel torque, belt tension, shim clearance, clean
drive surfaces, clutch pressure, and many other items for the specific model
recorder/reproducer in use.
In the event of problems beyond your maintenance
authority (operator's level), have your supervisor call a qualified technician.
a. Also, various voltage checks are made in the power supply and on other
modules in the unit. Check the maintenance manual for the specific model; be sure
that it covers all model or circuit changes, such as replacement of the printed
circuit boards which have been modified and/or updated.
b. Use an oscilloscope to check waveform envelope, horizontal
blanking
balance, interchange envelopes, sync pulses, and other areas as required.
4.
When doing maintenance work on equipment and you are doubtful about the
shape, size or position of parts, refer to the ILLUSTRATED PARTS BREAKDOWN for a
comparison.
a. This may lead to the discovery of a bent, misaligned, worn or grooved part
which would not be noticed otherwise.
b. Remember that the oxide coating on the tape will cause wear on the metal
parts of the recorder/reproducer and give it a polished appearance.
So if parts
are too shiny where they should be dull or have uneven surfaces where they should
be smooth, then it is time to look for a cause.
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