Nakamichi CR 4 Service Manual

Page 1

Nakamichi

Service Manual

Nakamichi
CR-4
CR-4A ,
CR-4E
CR-4O

Discrete Head Cassette Deck

Page 2

CONTENTS

1 General ...................................................................... 1
2. Remove! Procedures ............................................................. 3
2. 1. Top Cover Assy and Bottom Cover Assy ....................................... 3
2. 2. Cassette Case Cover ASSy .................................................. 3
2. 3. Mechanism Assy ....................................................... 3
2. 4. Monitor Switch Joint .................................................... 3
2. 5. Front Panel ........................................................... 3
2. 6. Bias P.C.B. Assy and Level Adjustment P.C.B. Assy ................................ 4
2. 7. Control P.C.B. Assy ..................................................... 4
2. 8. Head Mount Base ....................................................... 5
2. 9. Power Switch Joint ...................................................... 5
3. Test Tapes and Gauges ............................................................ 5
4. Mechanical Adjustments .......................................................... 6
4. 1 Record Head and Playback Head Tilt Adjustment .................................. 6
4. 2 Head Base Stroke Check .................................................. 6
4. 3 Erase Head Stroke Adjustment and Tape Guide Height Check .......................... 6
4. 4 Erase Head Height and Tilt Adjustment ........................................ 7
4. 5 Playback Head and Record Head Height Adjustment and Azimuth Alignment ............... 7
4. 6 Tape Travelling Check .................................................... 8
4. 7 Eject Damper Adjustment ................................................. 8
4. 8 Reel Motor Speed Adjustment in Play Mode ..................................... 8
4. 9. Tape Speed Adjustment ................................... 8
4. 10. Lubrication ........................................................... 8
5. Parts Location for Electrical Adjustment ............................ 9
6. Electrical Adjustments ....................................... 10
'I. Mechanism Assy and Parts List ...................................................... 15
7. 1. Synthesis .......................................... 15
7. 2 Chassis Assy (A01) ...................................................... 16
7. 3 Bottom Cover Assy (A02) ................................................. 16
7. 4 Mechanism Assy (301) ................................................... 17
7. 5. Front Escutcheon Assy (BOB) ................................... 17
7. 6. D.D. Motor Ass'y (C01) ................................................... 17
8. Mounting Diagrams and Parts List .............................. 19
B. 1. Fuse P.C.B. Assy ....................................................... 19
8. 2. Pin Jack P.C.B. Assy ............................... 19
8. 3. Input Volume P.C.B. Assy .......................... 19
8. 4. Output Volume P.C.B. Assy ............................................... 20
8. 5. Headphone P.C.B. Assy ................................................... 20
8. 6. Level Adjustment P.C.B. Assy .............................................. 20
8. 7. Bias P.C.B. Assy ....................................................... 20
8. 8. Shut-off P.C.B. Assy

B. 9. Power Supply P.C.B. Assy ..............................................
8. 10. Cal. Osc. P.C.B. Assy ................................................ 21
8, 11. Flywheel Holder Asy ................................................ . . 21
8. 12. Control P.C.B. Assy ..................................................... 24
8. 13. Main P.C.B. Assy ....................................................... 25
9. Schematic Diagrams ............................................................. 29
9. 1. IC Block Diagrams ...................................................... 29
9. 2. Schematic Diagrams .................................................... . 33
10. Wiring Diagram .............................................................. . 35
11. Block Diagrams ...... - 39
11. 1. Amplifier Section ...................................................... . 39
11. 2. Mechanism Control Section ............................................... . 40
12. Timing Charts and Eq. Amp. Frequency Response ........................................ . 40
12. 1. Timing Charts ........................................................ . 40
12. 2. Eq. Amp. Frequency Response ............................................ . 41
18. Specifications ................................................................ . 42

Page 19

53:51:31: Put No. Dem-lotion Q'ty sflfi'flg Put No. Delcriptlon Qgy
7.4. Moeheninn Auy (301) L05 03032211 312.516 $1M: 10
L06 03030431. 312.5r10 arm 2
301 01103333A Mechanism Auy 1 L07 030322511 Wuher 1.3r3.3x0.s 1
Serial No.: .113101001 - L08 03032201. Wuher 2.1r4.5x0.1 3
L09 00314211 Supply Tune Gutda 1
01 0C80021A Elect Lever 1 Adsurtnient Nut
02 00300201. Elect Lever Spflnz 1 L10 030304411 3-32.5x20 a Pen 1
03 CASOOOGA Pneumutlc Damper Ass'y 1 L11 0E03049A Wuha: 1.823.230!) 2
04 00800193 Elect Sprint 1 L12 0E00976A M2x§ 03indine 5
05 00800183 Cassette Cue Holder L 1 L13 0300025A Sum Wane: 2mm 2
05 0C80617A 3eek Tension Arm Spring 1 L14 03001111 Wuhu 21:43:04 5
07 OCBOSIBA 3eek Tenrion Arm Colin 1 L15 030033511 M2.6x4 e Blndinl 1
03 003031911 Back Tendon Arm 1 L10 000377411 Plrte Wuher L 1
09 000002011 Buck Tension Pulley 1 L17 0008773A Pluto Wuher 3 1
10 0C80621A Beck Tension am 1 L13 030322311 112314 39 Pm 1
11 00300131 Look Lever Spflnl 1 L19 03032321 M1.7r7 32 Pm 1
12 00800141. Look Lever Caller 1 L20 03032224 Wuhex 1.3rs.sxo.3 1
13 00300153 Lock Lever 1 L21 030323411 M2r3 «Men 2
14 0113036611 Supply Pressure Roller Ann Asly 1 L22 030022211 E-Rhu 2mm 1
15 00314201 Supply Pleasure Roller Arm 1 L23 03030351 M2x3.2 virus. 3
Spring L24 03 03227A Wuher 2.7xoxo.5 2
ls 003142211 Supply Pressure Roller Am 1 L25 03032311. 112an open 2
Thrust Spring 1.26 030304111 "25:4 ePen 2
17 CA80726A Supply Reel Hub An'y 1 L27 030323311 Werner 2.5x3r1 1
1s 0C80612A Svdn: Holder 2 L28 0E03230A FT2.6x12 open 1
19 OCBOGIAA Supply Reel Huh Spring 1 L29 0E00691A M2x3 eP-n (Nickel) 2
20 011302001 Cneette Cue Auy 1 L30 030323711 Nut Her. M2.6 1
21 000376211 Heed Heuht Adlumnent Gen 2 L31 030304 M2.Sx3 sanding 2
22 00037311. Heed Helxht Adlumnent Screw 4 L32 030059411 Nut Hex. M2 1
23 0008763A Azlmuth tumult Smw 2
24 00306051. Wire Clemper 1 7.5. Front meeueeheon Any (302)
25 CA08637A Heed Mount lane Sub Au'y 1
20 0.1035593 3-31. neeord Heed Auy 1 302 11110534211 Prone henteheon AIIV 1
27 00037701. Heed Plete Spflnl (L) 1 Seth] No.: 1113101001 .
23 CASO'ISIA 41> Connector 1
29 003000311 Heed 3m Hold Pinto 1 01 011051203 Rewind 3utton 1
30 00300014 steel Bail 3mm 1 02 HA0535911 Stop Button Auy 1
31 0.10220111 3-43- lime Held 1 03 1311053411 Ploy Button Au'y 1
32 0113073311 2P Connector 1 04 0110512911 FF nutton 1
33 0008168A E2333 Herd Hold note 1 05 HA06861A Pllne Button may 1
34 000333911 Ens: Heed l-lold Pl-ui Teperln: 2 06 HAOESGOA nee. Button Auy 1
Spring 07 0H06098A Function Plate 1
35 OCOBSBSA Erue Held Hold Plate Sprlnl 1 08 HAOGSMA Elect Button Auy 1
33 003000711 steel 3nll 2mm 3 09 0.105404.4 Elect Knob Syria: 1
37 0A036533 PzH-L Phybuk Had An)! 1 10 03051223 Front Escutchaon 1
33 0C08775A Heed Plete Satin! (3) 1 11 0.1054051 Power Switoli Knob Sprint 2
39 CA80732A 4P Connector 1 12 011051253 Power Swtuzh Knob 1
40 00037711. Tlpo Guide Phte 1 13 011050914 Function Button 2
41 CABOSSEA Hud Bue Sub Any 1 14 051051011 Display Lem 1
42 003001111 Heed Bore Splint 1 15 0H05103A LED Lens 3 1
43 CASO'IZBA llka-up Reel Hub Auy 1 16 0.1054623 EX Switch Sprint 1
44 0C80613A Tuka-up Reel Hub Spring 1 17 0110309 Button (Monitor) 1
45 CAGOSSSA lea-up Plenum Roller Arm 1 1s 0.105406A Push Switch 3utton Sprin; 7
Au'y 19 011050914 Push Button 8
46 0081423A Supply Plum:- Roll Arm 1 - 0.106458A LED Len: Adhadva Tune 1
Sprite; - 0105450A 1r. Plato Adhedye Tuna 1
4; 32:221. 31-33112- 1
4 11 w t 0 Pine 1 .
:9 062 3 Elm 2 7.3. in). Motor! (001)
0 003002411 Swi oilnr 11 2
51 003062611 Lee: Switch 1 001 680 gghlgfffigfimm . 1
52 gggogfie. :witelvagollnr 3 2 "
53 0 B "m m LN" 01 0113044 . Flywheel Holder Any 1
54 053035 Mechm CW 1 02 00814S4A Supply Flywheel Holder 1
55 00300223 Cuntta Hold Spflnl 1 03 33063 Cum w, 1
53 CA80011A Show 11.0.3. Auy 1 04 00314291. Suppl, when! M 1
57 53°20 3 A Y 1 05 003142711 Tuneup Flywhul Andy 1
53 W905? 35' 5W" 3 1 06 0C81426A Motor Piotr 1
59 003063011 nuke Arm Collnr 1 L01 01,033 .1 31315 Wm 3
60 003061 3"! Am 1 L02 030322911 2.5x6 open 1
61 008003 R! MW" 3019" 1 L03 030091211 Washer 2.6x4.7xo.25 (Polydldu) 2
3: 32:33:32 Ila-e21- x03! :3; : L04 03033431 Clpmn Worker 5 1
0 X SI
6 00314171 Cm G." 1 L05 0E08051A Wuher 2.5x7ro.3 1
65 0081418A Conuol Motor Holder 1
00 0031416A Thrust Spun; 3 1
07 003002711 Mode Switch 1
33 008141511 Werrn Thmrt.3ueh 1
69 CAEOOO'IA Control Motor Asty 1
70 00300101) Cueetto Cue Holder R 1
71 003001211 Elect Sensor 1
12 0C80037A lulu-Lock 3
73 0682935A 5P Conluctor 1
74 003293511 93 Connector 1
L01 OEOOIBIA E-Rind 3mm 3
L02 030323511 Plutic Wuher 3510.25 1
L03 030305211 cs stopper lung 2.411111: 2
L04 0E03236A M2r5 0 Pen (2.4) 4

18

Page 45

TIMING CHARTS AND EQ. AMP. FREQUENCY RESPONSE

12.

'nmxn: Chat!
(1) Oven]! Thain: Chuu

12.1.

Muchnnhm Comatol section

11.2.

n
u
m
L
.m

n9- [at

Play

u.
n
1. 2.
J m. 1.
2 n 2
l l 1
L m m
n F
u
p
m m
h r
C
I
m
u
l I w n n n n .n u r w n
m . r a o o o o a m r a
m M . y ) )
n .u Mo w u u
m m m m
a a a
c c c
. u m m m m
m m m m um m. m
u v x m . u h n u I
mTTmacm c mm mm .
r R a c a L 5 cc as m
M
fl
(
_I lllllllllll .-
H 5.555.; :9 5a
_ on: .1
_ _II._ I Es; IIIoHDH
O 0 Smash 5.3L on
_ :5. o 0 o is... Al/ :5: u<
_ Km: 2 is: o o o E
a c ,
zfiim .oLEau
O
. . Em I 9 + _ a;
u n m .A. a w a
3.; 2 { {k
3.63. _ < pulse .530 33 3 huh.
\\L E on
.ZEou \ . 0 2:30 .3!
\\L x 3
3....au N 5:25
_ «as.
:33» git-3L Eu _ to
\x _ N . um
\I n :z.a§xs.§u ,2; 8; on
9 u I
.352 3:63 a, ISL
35.25. .5
.25 3;: Ex a n I
ulm
n w I .
1
was A _I_ E \r u
as .1
E Ex< 1
3:23 0:: w n .mm
52% tolim asnzonifi «w I E F
5.3 a: > a
Y u 4
a
:0 Mavis
mi IE 1 F
5.5% 5:22: :25: . :5 T :5.
z :5: I 3 E \ I
v . s .c. I 2%
ANIWE z .2; :32... 0. 93.2.5. : u x E;=§.5
:o E: .5235,
.!=_L. 4.0.x an 5!..-
i; 5:83-23. «8:
I 5...: .228 5.55.:
3.3 noun:
0 I I
HTSE .3 s... n. C E D
as EOE-I
OI m C F. L .L
:6 5.55 55.3 3.. is...»
$9.52 vowu-
-!:i 2.4 v5.2 5:: flit! I-
_ £22.: egg 2.: a...
u.
. ., k K \ \ »

40