Revox A77 Service Manual

6.3. Playback Adjustment 26
6.3.1. Azimuth Adjustment, Playback Head, Coarse ( Max Level ) 27
6.3.2. Azimuth Adjustment, Playback Head, Fine ( Phase Method) 27
6.3.3. Playback Level from Test Tape 27
6.3.4. Frequency Characteristic, Playback ( from Test Tape ) 27
6.4. Oscillator and RF - Adjustment 28
6.4.1. RF - Voltages and Frequency Checking 28
6.4.2. Dummy Load 28
6.4.3. RF - Traps, Record 28
6.4.4. RF - Traps, Playback 29
6.5. Record - Adjustments 29
6.5.1. Azimuth Adjustment, Record Head, Coarse 29
6.5.2. RF - Bias 29
6.5.3. Azimuth Adjustment, Record Head, Fine 30
6.5.4. Record Level 30
6.5.5. Record Equalization 30
6.5.6. Frequency Characteristic via Tape 30
6.6. Distortion Factor Measurement 30
6.6.1. Distortion Factor I via Tape I, VU- Meter Calibration 30
6.6.2. Noise Voltage ( and External Voltage) via Tape 31
6.6.3. Noise Voltage, External Voltage " Before Tape" ( Check ) 31
6.6.4. Erase Attenuation 32
6.6.5. Crosstalk, Mono 32
6.6.6. Crosstalk, Stereo 32
6.7. Output Voltage Check 33
6.8. Wow and Flutter 33
7. ACCESSORIES
7.1. Remote Control
7.2. Timing Switch Operation
34
34
34
8. MODIFICATIONS 35
8.1. Rewind 35
8.2. Switch Noise 35
8.3. R F I 35
8.4. Transfer Play Sensitivity 35
8.5. Replacement of Capstan Motor 35
8.6. Capstan Motor with Sleeve Bearings 35
8.6.1. Removal of Capstan Shaft and low- friction Thrust Washer 35
9. TROUBLE SHOOTING 36
9.1. Faults in the Drive 36
9.2. Faults in the Circuitry 39
10. DIAGRAMS
Tape Drive 1.077.100
VU- Meter Board 1.077.480
Switch Board 1.077.435
Input Amplifier 1.077.700
Record Amplifier 1.077.705
Oscillator 1.077.712
Record Relay 1.077.715
Playback Amplifier 1.077.720
Loudspeaker Amplifier 1.077.850
Speed Control 1.077.725
11. REPLACEMENT PARTS LIST
12. SPECIAL VERSION
12.1. Revox A77 — DOLBY
Diag. 1
Diag. 2
Diag. 3
Diag. 3
Diag. 4
Diag. 5
Diag. 6a
Diag. 7
Diag. 8
Diag. 9
Diag. 10

Revox A77 Specifications

General

Brand	Revox
Model	A77
Category	Tape Deck
Language	English