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General| Brand | uher |
|---|---|
| Model | 4200 REPORT-STEREO |
| Category | Measuring Instruments |
| Language | English |
Describes the tape transport system, including motor, flywheel, capstan, and friction wheels.
Explains the motor's operation, armature windings, and transistor control network.
Details the amplifier's stages, printed-circuit boards, and equalization networks.
Details the components and design of the left and right-hand clutches.
Describes how to check and adjust tape drawing tension using a spring balance.
Explains the mechanism for fast forward and rewind operations using levers and springs.
Explains the alignment procedure for the sound head, including height and perpendicularity adjustments.
Provides instructions for replacing the motor, drive belts, and the driving wheel with the capstan.
Details lubrication requirements for sintered metal bearings and sliding/frictional points.
Emphasizes cleanliness of tape guides, sound head, and drive components.
Explains how to check and adjust the contact for motor speed regulation.
Covers the check and adjustment of the on/off switch related to the speed selector.
Explains checking and adjusting sliding contact members for recording/playback switching.
Covers checking and adjusting sliding contact members for the equalizer switch.
Refers to circuit diagram for settings, values, and tolerances for measurements.
Details the procedure for measuring wow and flutter, including desired values and tape requirements.
Outlines steps for measuring the overall frequency response, including demagnetizing the head.
Details measurement of recording and playback equalization across tape speeds.
Describes how to measure signal-to-noise ratio using a UHER test tape and a millivoltmeter.
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