Nakamichi 481 Service Manual - page 3
5. 10.
Record Switch Linkage Adjustment ………………………………………………………… 29
5. 11.
Flywheel Holder Adjustment
……………………………………………………………… 30
5. 12.
Eject Wire Adjustment ………………………………………………………………………… 30
5. 13.
Lubrication …………………………………………………………………………………… 30
6.
Parts Location for Electrical Adjustment
………………………………………………………… 31
7.
Electrical Adjustments and Measurements
……………………………………………………………… 32
7. 1.
Adjustment and Measurement Instructions
………………………………………… 32
7. 2.
Playback Frequency Response Adjustment
………………………………………… 35
7. 3.
Check on Dolby NR Circuit ……………………………………………………………………. 35
8.
Mounting Diagrams and Parts List
…………………………………………………………………….
36
8. 1.
Volume P.C.B. Ass’y ……………….……………………………………………………36
8. 2.
Control Switch P.C.B. Ass’y ……………………………………………………………………. 36
8. 3.
Switch P.C.B. Ass’y
…………………………………………………………………………. 36
8. 4.
Control P.C.B. Ass’y
…………………………………………………………………………. 36
8. 5.
Auto Shut-off P.C.B. Ass’y ……………………………………………………………………. 36
8. 6.
Lamp P.C.B. L Ass’y
…………………………………………………………………………. 36
8. 7.
Lamp P.C.B. R Ass’y …………………………………………………………………………. 36
8. 8.
Main P.C.B. Ass’y ………………………………………………………………………………. 37
9.
Mechanism Ass’y and Parts List
………………………………………………………………………….41
9. 1.
Synthesis
……………………………………………………………………………………. 41
9. 2.
Front Panel Ass’y (A01)
……………………………………………………………………. 41
9. 3.
Synthesis Mechanism Ass’y (A02)
…………………………………………………………. 41
9. 4.
Meter Escutcheon Ass’y (B01) ………………………………………………………………. 42
9. 5.
Control Switch Holder Ass’y (B02)
…………………………………………………………. 43
9. 6.
Headphone Jack Ass’y (B03)
………………………………………………………………. 43
9. 7.
Mechanism Ass’y 481 (B04)
………………………………………………………………. 44
9. 8.
Chassis Ass’y (B05)
…………………………………………………………………………. 45
9. 9.
Flywheel Holder Ass’y (C01)
…………………………………………………………. 45
9. 10.
Sub Mechanism Chassis Ass’y (C02)
……………………………………………………. 46
9. 11.
Main Mechanism Chassis Ass’y (C03)
……………………………………………………. 47
9. 12.
Rear Panel Ass’y (D01)
……………………………………………………………………. 49
9. 13.
Reel Motor Ass’y (E01)
……………………………………………………………………. 50
9. 14.
Control Motor Ass’y (E02) ……………………………………………………………………. 50
9. 15.
Head Mount Base Ass’y (F01) ………………………………………………………………. 50
9. 16.
Supply Pressure Roller Ass’y (F02) …………………………………………………………. 50
9. 17.
Take-up Pressure Roller Ass’y (F03) …………………………………………………………. 50
9. 18.
Head Base Ass’y C (F04) ……………………………………………………………………. 51
9. 19.
Cassette Case Holder L Ass’y (F05) …………………………………………………………. 51
9. 20.
Cassette Case Holder R Ass’y (F06) …………………………………………………………. 51
9. 21.
Auto Shut-off Ass’y (F07)
……………………………………………………………………. 51
9. 22.
Pneumatic Damper Ass’y (F08) ………………………………………………………………. 51
9. 23.
P-8L Playback Head Ass’y (G01)
…………………………………………………………. 51
9. 24.
R-8L Record Head Ass’y (G02) ………………………………………………………………. 51
10.
Overall Timing Chart
…………………………………………………………………………………….53
11.
Eq.Amp. Frequency Response
…………………………………………………………………………. 54
11. 1.
Playback Frequency Response ………………………………………………………………. 54
11. 2.
Record Current Frequency Response
……………………………………………………. 54
12.
Wiring Diagram
…………………………………………………………………………………………... 55
13.
Block Diagrams
…………………………………………………………………………………………...
57
13. 1.
Amplifier
……………………………………………………………………………………. 57
13. 2.
Mechanism Control
…………………………………………………………………………. 58
14.
Schematic Diagrams
…………………………………………………………………………………….
59
15. Specifications
……………………………………………………………………………………………62
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