Nakamichi Dragon Service Manual

Page 2

CONTENTS

1.
2.

3.
4.

5.

10.
11.

General ...................................................................... 2
Mechanical Adjustments .......................................................... 2
2. 1. Mechanism Control Cam Adjustment .......................................... 2
2. 2. Reel Motor Speed Adjustment in Play Mode ..................................... 2
2. 3. Record Head and Playback Head Tilt Adjustment .................................. 2
2. 4. Head Base Stroke Adjustment ............................................... 3
2. 5. Erase Head Stroke Adjustment and Tape Guide Height Check .......................... 4
2. 6. Erase Head Height and Tilt Adjustment ........................................ 4
2. 7. Back Tension Adjustment ................................... ' .............. 5
2. 8. Playback Head and Record Head Height Adjustment and Azimuth Alignment ............... 5
2. 9. Record Head Stroke Adjustment ............................................. 6
2. 10. Tape Travelling Adjustment ................................................ 7
2.1 1. Flywheel Ass y Height Adjustment ........................................... 7
2.12. Lubrication ........................................................... 7
Parts Location for Electrical Adjustment ..... . .......................................... 8
Electrical Adjustments and Measurements ............................................... 9
4. 1. Adjustment and Measurement Instructions ...................................... 9
4. 2. Frequency Response Adjustment ............ . ................................ 12
4. 3. Dolby NR Circuit Check .................................................. 13
Mechanism Ass'y and Parts List ...................................................... 14
5. 1. Synthesis ............................................................ 14
5 2. Cassette Lid Assy (A01) ................................... - ............... 15
5 3. Chassis Assy (A02) ...................................................... 16
5 4. Rear Panel Assy (BOl) ................................................... 16
6 5. Mechanism Assy (302) ................................................... 17
5 6. Flywheel Holder Assy (COl) ............................................... 17
6 7. Sub Mechanism Chassis Assy (CO2) ........................................... 18
5. 8. Main Mechanism Chassis Ass'y (COS) .......................................... 19
5. 9. Head Mount Base Assy (D01) ............................................... 20
5. 10. Supply Pressure Roller Assy (D02) ........................................... 20
5. 11. Take-up Pressure Roller Assy (D03) .......................................... 20
5 12. Head Base Assy (D04) ................................................... 20
5 13. Cassette Case Holder L Assy (D05) ........................................... 20
5 14. Cassette Case Holder R Ass'y (D06) ........................................... 21
5 15. Auto Shut-off Assy (007) ................................................. 21
5 16. Pneumatic Damper Assy (D08) .............................................. 21
5. 17. PA-1L Playback Head Assy (E01) ............................................ 21
5.18 R-8L Record Head Ass y (E02) .............................................. 21
Mou unting Diagrams and Parts List .................................................... 22
6. 1. Power Switch P ..C B. Assy ................................................. 22
6 2. Ease P.C.B. Assy ....................................................... 22
6 3. Shut-off P.C.B. Ass'y ..................................................... 22
6 4. Counter Pulse Generator P.C.B. Assy .......................................... 22
6 5. Direction P.C.B. Assy .................................................... 23
6 6. Timer Switch P.C.B. Assy ................................................. 23
6 7. Tape Select P.C.B. Assy .................................................. 23
6 8. Volume P.C.B. Ass'y ..................................................... 23
6 9. Counter P.C.B. Assy ..................................................... 23
6 10. Indicator P.C.B. Assy .................................................... 24
6. 11. Switch P.C.B. Assy ...................................................... 24
6. 12. Control P.C.B. Assy ..................................................... 25
6 13. Motor Control P.C.B. Ass'y ................................................ 25
6 14. Logic P.C.B. Assy .................. . ................................... 28
6. 15. Auto Azimuth P.C.B. Ass'y ................................................ 29
6.16. Main P. C. B. Ass y ....................................................... 32
Schematic Diagrams ............................................................. 33
7.1. Attention to Servicemen .................................................. 33
7. 2. 10 Block Diagrams ................................... ................... 34
7. 3. Amplifier Section ....................................................... 36
7. 4. Auto Azimuth Control Section .............................................. 37
7. 5. Mechanism Control Section ................................................ 38
Wiring Diagram ................................................................ 39
Timing Chart and Eq. Amp. Frequency Response .......................................... 39
Block Diagrams ................................................................ 40
Specifications ................................................................. 42

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5.

MECHANISM ASSY AND PARTS LIST

5.1. Synthoah

Fit. 5.]
E W _
Schematic
831%? Part No. Description 01w 3. No. rut No. Description
I HA04393A Synthesis (Japan) f 1 14 0110419 Meter Cove: 1
11110439211 Synthesis (0.8.11. a: Canada) 1 15 BA04893A Indicator no.3. my 1
BA04396A Sim-huh (220V Class 2) 1 10 BA04894A Counter 2.0.3. Assy 1
BA04391A synthesis (UK) 1 17 0.1046983 Shield Plate 1
11110439 Synthesis (Australia) 1 18 0H04180A Function Button I)
11110430 Synthesis (Guam) 1 19 0110420411 Calibration Volume Knob 12
Serial No.: A80101001 - 20 HA04422A Cover Plate 1
J 21 0M04377A Caution Label (U.8.A. a Canada) 2
01 011040104 Top Cover 1 22 01045504 'rop Cover Cushion 6
02 0.10465 Bottom Cover 1 23 OJOMROA Top Cour Himolon 3
03 0.10866 Lu T-H 4 24 0308616A Inns-Lock 1
04 0804203A Volume Knob 3 L01 0303032A 31 4:8 9P1!) (Washer Faced) 4
l 05 0110420211 Mute: Volume Knob 1 L02 woman 31' 3x6 enindlns a
06 0308787A Volume Knob Bus 3 nos 0300865A 31 a: 10 a Bindinl 4
07 0110373911 Master Volume Knob Base 1 1.04 OEOOOZIA 31* 3x0 eaindina 6
08 11.104401». Cassette Lid new 1 (Black Chmmate)
00 HAoasesA Front Panel Ass'y 1 L06 OEOOBGBA 31' 3x8 ealndinu 3
10 11110439» Front Panel Eacutcheon Asay 1 . L06 oaooobOA 31' 8x14 9P0!) (Black Chromste) 2
11 BAD4892A Contsol P.C.B. Ass'y 1 L07 OEOOBBBA 31 2.634 enindins 2
12 0.104707A Inmhtor 1 L08 0200964A n'r 2.6x8 enindins 10
1a JA08971A Chassis Ass'y (Japan) 1 1.09 0300869A 31' 2.636 0 Binding 3
JA08970A Chassis Assy (U.S.A. a Canada) 1
JA03074A Chassis Ans'y (220V Class 2) 1
JA03969A Chassis Asay (UK) 1
10397311 Chassis Aasy (Austxsiia) 1
JA03972A Chassis Au'Y (Others) 1 I
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