uher 4000 REPORT-L User Manual

Service

uher 4000 REPORT-L Specifications

General

Brand	uher
Model	4000 REPORT-L
Category	Measuring Instruments
Language	English

Summary

Functional Description

1.1 Drive Mechanism

Explains the electronically controlled motor, flywheel, capstan, and friction drive.

1.2 Motor Principle

Mechanical Assembly

2.1 Clutch Assembly

Describes the construction and function of clutches.

2.12 Adjusting the Right-Hand Clutch

2.13 Checking Unwinding and Winding Tensions

2.3 Drawing Tension

2.5 Fast Forward and Rewind Functions

Explains the mechanism and adjustment for fast forward and rewind operations.

2.7 Sound Head Alignment

Covers checking and adjusting the sound head height and perpendicularity.

2.9 Motor and Belt Replacement

Procedures for replacing the motor, drive belts, and drive wheel with capstan.

Lubrication and Maintenance

3.1 Lubrication

Switching Contacts: Checks and Adjustments

4.1 Motor Control Contact

4.2 Short-Circuit Contact

4.5 Battery Disconnecting Switch

4.6 Current Limiter Contact

4.7 Recording/Playback Switch Contact

4.8 Equalizer Switch Contact

Electrical Measurements and Adjustments

5.2 Wow and Flutter Measurement

5.3 Over-All Frequency Response

Details the measurement of the total frequency response across all tape speeds.

5.4 Recording Equalization Measurement

Explains how to measure and adjust recording equalization at different tape speeds.

5.5 Playback Equalization Measurement

Details the procedure for measuring and adjusting playback equalization.

5.6 Noise Voltage Measurement

Describes the method for measuring signal-to-noise ratio using a UHER test tape.