Teac A-450 - Table of Contents

CONTENTS
Specifications & Service Data .............. 3
Test Equipment Required ................ 4
TEAC Test Tape .............. 4
Partial Dis-assembly of Main Parts............ 5
3-1. Case/Front Panel .............. 6
3-2. MOtOL oie cece ee ee eae ew eee 6
3-3. Cassette Holder. ............6.-- 7
3-4. Head/Pinch Roller .............. 7
0 Vena (-1:\¢ a em 7
3-4B. Pinch Roller.................- 7
3-5. Brake Bracket .............06- 8
3-6. Capstan Drive Ass’y/Drive Belt. ..... 8
3-7. Reel Table: icscce ve ve ae eee Sate 9
3-8. Fast Wind Roller Ass’y .......... 10
3-9, Power Transformer ............ 10
3-10. Play Idler Assy .............2.- 11
Mechanical Checks and Adjustments .......... 11
41. Pinch Roller Pressure .........-.. 11
42. Take-Up Torque .............. 12
43. Fast Forward Torque ............ 12
44. Rewind Torque .............-..- 13
Torque Measurement using
The Cassette Torque Meter ........ 13
4-5. Brake Tension .............00- 13
4-6. Tape Speed/Wow and Flutter ...... 14
4-6-1. Tape Speed ..............04.8.- 14
46-2. Wowand Flutter .............. 14
Parts Location 2.1.0.0... cece eee ee ee eee 15
Lubrication «2.0.2.0... eee ee ee eee 16
61. MOtOf rei gee lot Ae oe area eRe 16
62. Capstan Assy ........20e ee eee 16
6-3. Flywheel Ass’y ............606- 16
Electrical Checks and Adjustments .......... 16
7-1. Playback Performance .......... 17
7-1-1. | Record/Playback Head
Azimuth Adjustments ..........
7-1-2. Specified Output Level Setting......
7-1-3. VU Meter Calibration -Playback- ...
7-1-4. | Frequency Response -Playback-
7-1-5. Signal to Noise Ratio -Playback- ....
7-1-6. Headphone Output Level Checks ....
7-2. Monitor Performance ............
7-2-1. Minimum Input Level Checks ......
7-2-2. Specified LINE Control Setting
7-2-3. DOLBY FM/COPY CAL
Control Setting ................
7-2-4, VU Meter Calibration -Record-......
7-2-5. LED Peak Level Indicator
Calibration ..............000-
7-2-6. Dolby NR Effect Measurement
7-2-7. Dolby FM Compensator
Efficiency Checks ............-.
7-3. Recording Performance ..........
7-3-1. Bias Trap Adjustments ..........
7-3-2. Record Bias Setting ............
7-3-3. Record Level Setting ............
7-3-4. Distortion Checks ...........-..
7-3-5. Frequency Response -Overall- ......
7-3-6. Signal to Noise Ratio -Overall-......
7-3-7. Erase Efficiency ..............
7-3-8. Channel Separation ............
7-3-9. Adjacent Track Crosstalk Measurement
7-4. Adjustment Location ............
8. Level Diagram ......... 0... eee eee eee
9. Trouble-Shooting ........... 0... eee eee
10. Model Differences Comparison Chart ........
10-1. Functional Difference Table ......
10-2. Electrical Alignment Section ......
10-3. Frequency & Voltage Conversion ...
26
262mm (10 546)
ES
i}
410mm(16 ¥g')
445mm (17 2’)
176 mm(6 jg) —4
LTT TTT ty Ea ona co
SISAL
M-O13-1
Fig. 1-1 A-450 Dimensions