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4400 report stereo ic
uher 4400 report stereo ic Service Manual
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2
Table of Contents
Contents
3
Function Description
4
Drive System
4
Principle of the Motor
5
Layout of the Electronic System (UHER 4000 REPORT IC)
5
Layout of the Electronic System (UHER 4200 and 4400)
6
Mechanical Section
7
Clutches
7
Construction of the Left/Right-Hand Clutch
7
Checking and Setting the Left-Hand Clutch
7
Checking and Setting the Right-Hand Clutch
8
Pressure of the Pressure Roller on the Capstan
9
Testing and Adjusting the Right-Hand Brake
9
Checking and Adjusting the Working Travel of the Pressure Roller
10
Testing and Adjusting the Pause Control Relay
10
Fast Forward and Rewind
11
Tape Guide
11
Checking and Adjustig the Fast Forward/Rewind See-Saw
11
Checking and Adjustig the Fast Forward/Rewind Functions
11
Sound Head
12
Checking and Adjusting the Vertical Alignment
12
Checking and Adjusting the Perpendicular Position
12
Speed Selector
13
The Pressure of the Flywheel Onto the Drive Wheel
13
Replacing Components
14
Replacing the Motor
14
Replacing the Driving Belt of the Flywheel
14
Replacing the Clutches
14
Lubrication and Maintenance
15
Contacts
16
ON/OFF Switch K5 4000 or K 4 4200/4400
16
Contact for Motor Control K2 4000 or K3 4200/4400
16
Battery Switch K6 4000 or K5 4200/4400
16
Battery Cutout K7 4000 or K6 4200/4400
17
Current Limiting Contact 'Rel.a'
17
Short-Circuit Contact K1 4000
17
The Sliding Contact Member of the Recording/Playback Switch
17
Electrical Assembly
18
The Sliding Contact Member of the Equalizer Changeover Switch
18
Electrical Adjustment and Ratings
18
Measuring the Over-All Frequency Response
18
Measuring the Recording Equalization
19
Measuring Playback Equalization
20
Measuring the Noise Voltage
20
Circuit Diagram
21
Service Instructions
22
Adjustment of Variable Resistors
22
Checking the Final Stage
22
Mechanical Measurement
22
Opening the Machine
24
Checking the Low Frequency Electronic
24
4
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uher 4400 report stereo ic Specifications
General
Brand
uher
Model
4400 report stereo ic
Category
Stereo System
Language
English
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