Nakamichi 480Z User manual

Nakamichi
Service Manual
Nakamichi
4302
2 Head Cassette Deck

CONTENTS
45. SGerietalic20% ee cha ae en wae ale a ee a hee Ee GIS eh a ee 3
2° Removal Procedures: x xcd bc Seo ce Ne he oe ee i RE we EE BOE Wye TE Teel ae ewe eee ede 4
Ze) ls Cassette Case: Cover Ass’y og ona 8 hulu le asectete dd, of soe Wi pinta ee serie cee ets cater p Haves oe Waaar aS Se aa, edd 4
2. 2 Top Cover Ass: Vs. sss: Site Vee ah di pad le Bens cee ie oa Wire Wahine eta a eh ke AGE OE ae ae Ae Way Bod OS 4
2. 3 Bottom: Cover:Ass’'¥) si sce Sh ecw He bee Se SS aa Cord oe MN ie Ew Oa whe bee as 4
2. 4. Front: Panel Ass’y +i. < so Se dhe cee Scales eee A eee Cig See a bs SEG We NEE Gat 5
22°25, Headphone Jack Ass’ esd y0 ce a aha ond, dow, es Ble RIN a eda Ni ae ea oa a oe a euece Ge ae 5
2. 6 MechianismAss'¥: | xc: 5. 00s ed Geli se alb ec ee RG See le dian eA aR aaa) ese eldn eH wadile TO tends A, 5
2. 7 Level Indicator Ass’y, Lamp P.C.B. Ass’y and Indicator P.C.B. Ass’y 2.1.0... 0c ce eee ee eee 5
2. 8. Logic P.C.B. Ass’y, Headphone Switch P.C.B, Ass’y and MPX Filter Switch P.C.B. Ass’y ........ 5
2. 9). “Main PiC.BWASS'Y: esses, 2 ois ae Sod a een ote Barbee Kawah daw od wag ae wa eae eA 6
2. 10. Control Switch Holder Ass’y 2.0... ee ee eee 6
2. 11. Switch P.C.B Ass yes ode icee dee tesa seats stae, aces Pe A ae are diel Sew Mie alae: Shae eens At tata ae 6
2. 12 Volume P.C.B. Ass’'y and Control Switch P.C.B. Ass’y 2.0... 0c cc ee eee nee 6
2. 13. Rear Panel Ass’‘y, Power Transformer and Power Switch 1... . 0... eee ee ens 8
2. 14. Cassette Case Ass’y and Cover Plate Ass’y 22... eee ee eee eee 8
2. 15. Tape: Counter: ASs’¥ c5. 5: ie Seatine Sb ees “od aed Beslan’, ety ane eae Boole be Wa Ae Dada vial ae eae Ee a 8
2. 16. Capstan Motor Ass’y and Flywheel Ass’y 1... 0.0.00 cece ee ee eee eet eee 8
2. 17. Sub Mechanism Chassis Ass’y . 0... 0c ee ene eee ee eee eee eens 9
2. 18. Control Motor Ass’y and Reel Motor Ass’y .. 0.0... cc cece ee ee eet ee ene eens 9
2. 19. Cam. Gontrol VOlUMe 6a. ne. calie 2 apa a ca ca tp cee) g) eb bee Mar eae, ocoseteh we Vy Wea Eo gee Re Glee Sahn 9
2. 20. Reel Hub Ass’y and Idler Ass’y 2.1... cee ce eee eee ee eee tenes 9
2. 21. Cam Drive Gear and Control Camo... ee ee ete 10
2. 22. Head’ Mount:BasesAss'y. <2 3 4rc 3p aiee ert cia eck Se Re pier erie tere, Biel eaw bahar ene ee ee LG 10
2. 23. Pressure Roller Ass’y and Erase Head .. 0... 2. ce ee ee ee eee 10
2. 24. Record/Playback Head Ass’y 1.1.0... cece ee ee eee eee ee eee eee ee eee eee 10
3. Measurement Instruments ......0 0. 2c ee ee eee ee ee eee eee 11
4. Mechanical Adjustments ....... 0. ccc ee eet et eee eee ee eee ee eee ee eee ee weet ae 11
4. 1. Mechanism Control Cam Adjustment . 0... 0... 0.2 ce ee eee eee 11
4. 2 Tape:Speed Adjustment ..c6 0s eh eee ee Se ee ede Mee Ob re nee we ee we wale es 12
4. 3 Record/Playback Head Tilt Adjustment ..... 0... 00. eee te ee eee eee 13
4. 4. Head Base Stroke Adjustment .. 0... cc ee ee ee ee eee ee eens 14
4. 5, Tape Guides Adjustment and Erase Head Stroke Adjustment .......... 000. c cece eee eee 14
4. 6 Erase Head Height and Tilt Adjustment 2.0... 0. . ee cee ee ee eee eee 15
4. 7 Back Tension Adjustment ......0. 0. cece ete eee een eee eee nes 15
4. 8. Record/Playback Head Height Adjustment and Azimuth Alignment ........ 2.000 ce eee eens 16
4. 9. Tape Travelling Adjustment ........ 0... cece eee eet eee eens 17
4. 10. Record Switch Linkage Adjustment .. 0.0... 0. cee ee ee et een eee nee eens 17
4. 11, Flywheel Holder Adjustment 1.0.0.0... 00. eee eee ee eee eee eens 18
4, 12. Eject Wire Adjustment... 0.0.0... cc ee ee ee eee eee eee 18
4, 13. LU PICRTION = ).2. he Sie sand SN aFc oe HOSE DE VERO A GA hd dace Mca na eed cal cena S a dia te la cate WR a 18
5. Parts Location for Electrical Adjustment... 0.0.0.0... cc ee en ene eect e enn 19
6. Electrical Adjustments and Measurements .......... 00 cece eee eee ee eee ee nents 20
6. 1. Adjustment and Measurement Instructions 2.2... .. ce ce ee ee ee ene 20
6. 2. Playback Frequency Response Adjustment ....... 0... cee eee eee ee ee eee 23
6. 3. Dolby NR Circuit: GHECK 4d s.0 de iead ad Sects dete hee BE ae ueeen Lee WEES wir nw eaeSgoeeen rea ale 24
7. Mounting Diagrams and Parts List ... 2.0... 2 eee ee ee ee te eet ee eee 25
7. 1. Main Pi. BASS ye: aa: ca ss ce isa hema: can eee ae Peat, hates; bE ages Ache GMO dee tain wre agaceon nce aca 25
7. 2. Voltime:P.C:Be: Ass! Vo 5.5, oS cee eae a eid Sie ee ek eed Bees de sean Pa Ae ace ee aad ee ee ee ene 31
7 3. amp:P.C:Bo Ass’ y 0 ste ate te cee aia, aah asta etei lee ah, tee ee ence he BE a fal abl alia BV ete eal ae eos 31
7. 4. MPX. Filter: Switch. P.C.B- ASS’. on ee See ee eee eee ae ede dal eee eee abd Vw 31
7. 5. Headphone Switch P.C.B. Ass’y............ Pathe iblon ge acing S Macrae tn ants Ua nls ald UAT tec Byalip see 31
7. 6. Bias Tune Volume P.C.B. Ass’y 2... ee ee ee eee eee eee 31
7. 7. Indicator PsCoBs ASS? icici cise odo beara Wiha hieixce 0 en ME note. wud oe GS Sere aa a: 31
7. 8. Switch P.C.B. Ass’y...........-. sige Sod ata Stee ets a Sica hve Ree ata de goahn gediede a aettesding 31
7. 9. Shut-off-P:G:BisAss' Vie «hei oe a ba ee ed ole Gee Sea ee oe ea eg Oe rae 32

8.
11.
12.
13.
14,
7. 10. Controu:P:C.Be Assy 4.653% @ hada Ga tant Add BA bea de Rate ate ee eck lee ade 32
7. 11, Control:Switch:P: GB Ass’ soe cnc dc ee BB sre thes SR a a abe, Se bY 32
7. 12. Logic, P.C:BuASs' yi 5.0. av see ante diss Gide Bye ered 4 ee Ee Se an eS eae Ae es 33
Mechanism Ass‘y and Parts List... 0... cc ee ee eee ee nee een ee ne eas 37
8. 1. Synthesis: esse se Side be obo ae edna rs Se Peewee ws decane and iG Beapaiee. “oda tok 37
8. 2. Front Panel-Ass’y (AOU): <.3:6-5 3 Gig esetca eee 0 es Deane Saeco ae ans ec and SL aA w Wd: ora hae ee aes 39
8. 3. Synthesis Mechanism Ass’y (A02) 1... 0.0... cc ee ee ee eee eee ee eee eee 39
8. 4. Meter Escutcheon Ass’y (B01) 2.1... .. ee ee eee ee ee ete ee eee eens 41
8. 5. Control Switch Holder Ass‘y (B02) . 0... ec ce ee ee tee ee eee eee eee eens 41
8. 6. Headphone Jack Ass‘y (B03) 2... wc ce eee eee ee ee eee ee ees 42
8. 7. Mechanism Ass’y 480Z (B04)... 0... ee ee eee ne et eens 43
8. 8. Chassis:Ass’y3(BO5) soo so ace oie, area means, 2 alles bBo aica ace eames eneiw Gadde BE ate Meee ats 44
8. 9. Flywheel Holder Ass’y (CO1) 20... ce ee te ee eee eee teeta 44
8. 10. | Sub Mechanism Chassis Ass’y (CO2) .. 0... ec ee eet eens 45
8. 11. Main Mechanism Chassis Ass’y (CO3) 1.0... 0. 0c ee ee ete ee ee eee ee eee ee ee eens 46
8. 12. Rear: Panel Ass'y (DOT) fis ese. ohh Ri eee data & ahagiee et nae os oe Sew MS and ee ee ee aS 47
8. 13. Capstan Motor Ass’'y (E01)... 1... ee eee ee ee ee teeta 48
8. 14. Reel Motor Ass’'y (FO1) 2.0... ce ce ee ce eee ee tee ee eee e ees 48
8. 15. Control Motor Ass’'y (FO2) 2... cc ee eee ee eee eee ee eee 48
8. 16. Head Mount Base Ass’'y (G01)... 0... ee eee eee eee ee ee ene 48
8. 17. Supply Pressure Roller Ass‘y (G02) 2... ee ee eee eee ee eee 48
8. 18. | Take-up Pressure Roller Ass’y (G03) 2... ee te eee eee 49
8. 19. Head Base Ass’y C:(G04) c22:56 eee ea Sh eee Ee ae ee Pewee Daw Dh eas 49
8. 20. Cassette Case Holder L Ass’y (G05) 1.0... ee ee ee eee eee eens 49
8. 21. Cassette Case Holder R Ass’y (G06)... 1... ec ee ee ee ee ee ee eee 49
8. 22. Auto Shut-off Ass’y (GO7) 2... ee eee ee ene nent nee e tenes 49
8. 23. Pneumatic Damper Ass’y (G08)... 1... ee ee ete een e ete eens 49
8. 24. RP-9E Record/Playback Head Ass’y (HO1) 2.1... ee ee ee tenes 50
Overall: Timing Cart 6.5 eater cee ciclo sire teria ean Bd pa we ge aig ese etewae a eked ean ar ante. 4, BORIS, areal eke es see 51
Eq. Amp. Frequency Response ... 2... 0... eee ee ee eee ee eee eee eee ee ee eee 52
10. 1. Playback Frequency Response ........ 0 eee cece ee ee ee ee ees 52
10. 2. Record Current Frequency Response ........ 0... cee ee eee tenet eet ete eee 52
Wiring Diagrarti: i ieecise sic ohare slot ts eat acd Be, a an eh rg AA eae eh ale eae BRU BAe Dace ac renug et ents des ty 53
Block Diagrams... ic.eica Seed Sean he Gad wi ieee el WS Oo a Se ah CALE EAE wh aaa oe aw ala we Ce ea aM 55
42.0 “Le CAMplifier SOCtiON ssc 5 Soe ln cee ee eae he erie esate ae OIG wae as bw ace We RR os ORS te 55
12. 2. Mechanism Control Section 1.0.0... ee eee eee tee 56
Schematic: Diagrams «iss: a ewe Sats ee ere edd ee sae ee LER a FB sea he De hae dea, Sar teaere, Berane aS 57
13. 1. IG Block: Diagrant 5. sc aa fact kok dew ae er ae a Pe ee Fa oe Sw ae a a ee CO 57
13. 2. Attention to Servicemen 1.0.0... ce ee ee ee ee ee ee ees 57
13. 3. Mechanism Control Section ...... 2... 02 cee ee ee ee eee eee eens 58
13. 4. Amplifier Section) 2 i.0: 6 oc sae ea ON oe ha ee we Sa ae ee Be ne ee wa ae ees 60
SPecificatiOnS: -25::20say4i odes die aad wkend Heed re aragle Wee: te arate eye ele ahd vere, eet eee de ts a eet dee 62

1. GENERAL
1.1. Control Functions
The Nakamichi 480Z control functions are shown below:
OON AARON >
Power Switch
Cassette Lid
Eject Button
Counter Reset Button
Tape Counter
Input Level Controls
Peak Level Meters
Headphone Jack
Bias Tune Control
1.2. Voltage Selector
Voltage Selector is installed on the rear panel for Other Version of the Nakamichi 480Z.
This voltage selector can select either 120 V or 220-240 V at customer’s disposal.
10.
11.
12.
13.
14,
15,
16.
17.
18.
Fig. 1.1 Front View
Nakamichi 480Z
2 Head Cassette Deck
Fig. 1.2 Rear View
Record Button
Rewind Button
Stop Button
Play Button
Fast-Forward Button
Pause Button
Tape Memory Switch
Tape Selector Switch
Dolby NR Switch
19.
20.
21.
22,
23.
24.
25.
26
Eq. Switch
MPX Filter Switch
Input Jacks
Headphone Level Switch
Output Jacks
Remote Control Socket
Voltage Selector Switch
Power Cord

2. REMOVAL PROCEDURES
2.1. Cassette Case Cover Ass’y 2.3. Bottom Cover Ass’y
Refer to Fig. 2.1. Refer to Fig. 2.1.
(1) Press the Eject Button to open the Cassette Case (1) Remove FO5, then disassemble FO6 (Bottom Cover
Ass’y. Ass’y).
(2) Pull out FO1 (Cassette Case Cover Ass’y) upwardly.
2.2. Top Cover Ass’y
Refer to Fig. 2.1.
(1) Remove FO2 and FO3, then disassemble FO04 (Top
Cover Ass’y).
FO
FO4
|_—_—F06
Fig. 2.1

2.4. Front Panel Ass‘y
Refer to Fig. 2.2.
(1) Refer to Fig. 2.1. Remove Top Cover Ass’y and
Bottom Cover Ass’y referring to items 2.2 and 2.3.
(2) Pull out FO1 (Volume Knobs) and FO2 (Bias Tune
Volume Knob).
(3) Remove FO3 (Power Switch Joint Bar) by releasing
the self-interlocking pin of the Power Switch Joint
Bar from Power Switch, and turn F03 (Power Switch
Joint Bar) by 90° either clockwise or counterclock-
wise, then disassemble FO3 (Power Switch Joint Bar)
from the Power Switch Knob Ass‘y.
(4) Remove FO4, then disassemble FO5 (Front Panel
Ass’y).
2.5. Headphone Jack Ass’y
Refer to Fig. 2.2.
(1) Remove Front Panel Ass’y referring to item 2.4.
(2) Remove F06, then disassemble FO7 (Headphone Jack
Ass‘y).
(3) Remove FO8 and FO9, then disassemble F10 (Bias
Tune Volume P.C.B. Ass’y).
(4) Remove F11 and Fi2, then disassemble F13 (Head-
phone Jack).
Fig. 2.2
2.6. Mechanism Assy
Refer to Fig. 2.2.
(1) Remove Front Panel Ass‘y referring to item 2.4.
(2) Remove F14 and F15, then disassemble F16 (Mecha-
nism Ass’‘y including 5 connectors and Record
Switch Linkage).
2.7. Level Indicator Ass’y, Lamp P.C.B. Ass’y and Indi-
cator P.C.B. Ass’y
Refer to Fig. 2.2.
(1) Remove Front Panel Ass’y referring to item 2.4.
(2) Remove F17 (Level indicator Ass’y) by releasing self-
interlocking pins of Level Indicator Ass’y.
(3) Remove F18, then disassemble F19 (Lamp P.C.B.
Ass‘y).
(4) Remove F20, then disassemble F21 (Shield Case).
(5) Remove F22, then disassemble F23 (Indicator P.C.B.
Ass’y).
2.8. Logic P.C.B. Ass’y, Headphone Switch P.C.B. Ass’y
and MPX Filter Switch P.C.B. Ass’y
Refer to Fig, 2.3.
(1) Refer to Fig. 2.1. Remove Top Cover Ass’y referring
to item 2.2,

(2) Remove FO1 and FO2, then disassemble FO3 (Logic
P.C.B. Ass’y). °
(3) Remove FO4, then disassemble FOS (Headphone
Switch P.C.B. Ass’y and Shield Case).
(4) Remove FOG, then disassemble FO7 (MPX Filter
Switch P.C.B. Ass’y).
2.9. Main P.C.B. Ass’y
Refer to Fig. 2.3.
(1) Refer to Fig. 2.2. Remove Front Panel Ass’y, Logic
P.C.B. Ass’y and Headphone Switch P.C.B. Ass’y
referring to items 2.4 and 2.8.
(2) Remove 2 connectors and the wires connected by
wrapping from the F13 (Main P.C.B. Ass’y).
(3) Remove FO8, FO9, F10, F11, F12 and the Record
Switch Linkage from the Wire Holder of Record
Switch, then disassemble F13 (Main P.C.B. Ass’y).
2.10. Control Switch Holder Ass’y
Refer to Fig. 2.3.
(1) Refer to Fig. 2.2. Remove Level Indicator Ass’y refer-
ring to item 2.7.
(2) Remove F14, then disassemble F15 (Control Switch
Holder Ass’y).
2.11. Switch P.C.B. Ass’y
Refer to Fig. 2.3.
(1) Refer to Fig. 2.2, Remove Front Panel Ass’y referring
to item 2.4.
(2) Remove F16, then disassemble F17 (Switch P.C.B.
Ass’y).
2.12. Volume P.C.B. Ass’y and Control Switch P.C.B.
Ass’y
Refer to Fig. 2.3.
(1) Remove Control Switch Holder Ass’y referring to
item 2.10.
(2) Remove F18, then disassemble F19 (Volume P.C.B.
Ass’y).
(3) Remove F20, then disassemble F21 (Control Button
Spring).
(4) Remove F22 (Control Button Shaft), then disassem-
ble F23 (Control Buttons).
(5) Remove F24, then disassemble F25 (Control Switch
P.C.B. Ass‘y).
FO3

Fig. 2.4

2.13. Rear Panel Ass’y, Power Transformer and Power
Switch
Refer to Fig. 2.4.
(1) Refer to Fig. 2.1. Remove Top Cover Ass’y and
Bottom Cover Ass’y referring to items 2.2 and 2.3.
(2) Remove FO1, FO2 and FOQ3, then disassemble F04
(Rear Panel Ass’y).
(3) Remove FO5 and FO6, then disassemble FO7 (Power
Transformer).
(4) Remove Power Switch Joint Bar by releasing the
self-interlocking pin of the Power Switch Joint Bar
from Power Switch and FO8, then disassemble FO9
(Power Switch Holder Ass’y).
(5) Remove F10, then disassemble F11 (Power Switch).
2.14. Cassette Case Ass’y and Cover Plate Ass’y
Refer to Fig. 2.5.
(1) Refer to Fig. 2.2. Remove Mechanism Ass’y referring
to item 2.6.
(2) Press the Eject Button to open the Cassette Case
Ass‘y.
(3) Remove FO1, then disassemble the piston of the
Pneumatic Damper Ass’y.
(4) Remove FO2 and FO3 (Cassette Case Holder L Ass’y),
then disassemble F04 (Cassette Case Ass’y).
(5) Remove FO5, then disassemble FO6 (Cover Plate
Ass’y).
2.15. Tape Counter Ass’y
Refer to Fig. 2.5.
(1) Refer to Fig. 2.2. Remove Level Indicator Ass’y
referring to item 2.7.
(2) Remove F0O7, then disassemble FO8 (Tape Counter
Ass’y).
2.16. Capstan Motor Ass’y and Flywheel Ass’y
Refer to Fig. 2.6.
(1) Refer to Fig. 2.2. Remove Mechanism Ass’y referring
to item 2.6.
(2) Remove FO1 and FO2, then disassemble FO3 (Fly-
wheel Holder Ass’y) and F08 (Capstan Belt).
(3) Remove F04, then disassemble FO5 (Capstan Motor
Ass‘y).
(4) Remove FOG, then disassemble FO7 (Control P.C.B.
Ass’y).
(5) Remove FO9 (Supply Flywheel Ass’y), then dis-
assemble F10 (Take-up Flywheel Ass’y).
(6) After removing both Flywheel Assemblies, disassem-
ble F11 (Thrust Washer 3 mm), F12 (Thrust Washer
2.6 mm), F13 (Flange Thrust Caps) and F14 (Flange
Thrust Springs).
FO3

2.17. Sub Mechanism Chassis Ass’y
Refer to Fig. 2.7.
(1) Refer to Fig, 2.6. Remove Fiywheel Assemblies refer-
ring to item 2.16.
(2) Remove FO1 and FO2, then disassemble FO3 (Sub
Mechanism Chassis Ass’y).
2.18. Control Motor Ass’y and Reel Motor Ass’y
Refer to Fig. 2.7.
(1) Remove Sub Mechanism Chassis Ass’y referring to
item 2.17.
(2} Remove F04, then disassemble FO5 (Control Motor
Ass‘y).
(3) Remove FOG, then disassemble FO7 (Reel Motor
Ass’y).
FO3<
2.19. Cam Control Volume
Refer to Fig. 2.7.
(1) Remove Sub Mechanism Chassis Ass’y referring to
item 2.17.
(2) Remove FO8, then disassemble FO9 (Volume Coup-
ler).
(3) Remove F10, then disassemble F11 (Cam Control
Volume).
2.20. Reel Hub Ass’y and Idler Ass’y
Refer to Fig. 2.7.
(1) Remove Sub Mechanism Chassis Ass’y referring to
item 2.17.
(2) Remove F12 (Ree! Hub Heads), then disassemble F13
(Reel Hub B Assemblies), F14 (Reel Hub Take-up
Fig. 2.7

Ass'y), F15 (Reel Hub Supply Ass’y), F16 (Back
Tension Ass’y) and F17 (Back Tension Spring).
(3) Remove F18, then disassemble F19 (Idler Ass’y).
2.21. Cam Drive Gear and Control Cam
Refer to Fig. 2.7.
(1) Remove Sub Mechanism Chassis Ass’y referring to
item 2.17.
Remove F20, then disassemble F21 (Cam Drive
Gear).
Remove F22, then disassemble F23 (Counter-Load
Arm Ass’y).
Remove F24, then disassemble F25 (Control Cam).
(2)
(3)
(4)
2.22. Head Mount Base Ass’y
Refer to Fig. 2.8.
(1) Refer to Fig. 2.5. Remove Cassette Case Ass’y refer-
ring to item 2.14.
(2) Remove FO1, then disassemble FO2 (Head Mount
Base Ass’y).
2.23. Pressure Roller Ass’y and Erase Head
Refer to Fig. 2.8.
(1) Remove Head Mount Base Ass’y referring to item
2.22.
Remove FOQ3 and a washer, then disassemble FO4
(Supply Pressure Roller Ass’y).
Remove FO5, then disassemble FO6 (Erase Head).
Remove FO7 and a washer, then disassemble FO8
(Take-up Pressure Roller Ass’y).
(2)
(3)
(4)
2.24. Record/Playback Head Ass’y
Refer to Fig. 2.8.
(1) Remove Head Mount Base Ass‘y referring to item
2.22.
(2) Turn FO9 by 90° by pushing it, then disassemble F10
(Record/Playback Head Ass’y).
r FO2
Fig. 2.8
10

(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
(15)
(16)
(17)
(18)
(19)
(20)
(21)
(22)
(23)
(24)
(25)
(26)
(27)
Note:
MEASUREMENT INSTRUMENTS
Audio Generator (20 Hz — 200 kHz)
AC Millivolt Meter (with dB measures)
Oscilloscope (DC — 5 MHz)
Distortion Meter
Speed & Wow/Flutter Meter
Frequency Counter (DC — 1 MHz)
Ohm Meter
DC Volt Meter
AC Volt Meter
Torque Gauge (DA09013A)
15 kHz Azimuth Tape (DA09004A)
3 kHz Speed & Wow/Flutter Tape (DAQ9006A)
1 kHz Track Alignment Tape (DA09007A)
400 Hz Level Tape (DAO9005A)
20 kHz PB Frequency Response Tape (DA09001A)
15 kHz PB Frequency Response Tape (DA09002A)
10 kHz PB Frequency Response Tape (DA09003A)
Reference EXII Tape (DAO9066A)
Reference SX Tape (DAQ9025A)
Reference ZX Tape (DA09037A)
Tilt Check Gauge M-9036 (DA09036A)
Stroke Check Gauge M-9038 (DA09038A)
EH Tilt Check Gauge M-9040 (DA09040A)
EH Stroke Check Gauge M-9051 (DA09051A)
Back Tension Gauge (DAO9055A)
Tension Arm Adjustment Cassette (DAOQ9056A)
Audio Analyzer T-100
(including Distortion, Wow/Flutter, Speed, Oscillator
and dB meters)
(10) — (27) are the products of Nakamichi
Corporation.
“nN
"
Mechanism 5
Chassis X
Pointer
Fig. 4.1
VR6O2
R606
15K @\ (Stop)
VR6OI
10K
Cam Control! (Play)
Volume
a
L———— to Control Motor
Fig. 4.2
11
4. MECHANICAL ADJUSTMENTS
4.1. Mechanism Control Cam Adjustment
Before adjustment, disassemble the Front Panel Ass‘y
then remove the Cover Plate Ass’y referring to items 2.4
and 2.14.
(1) Offset Adjustment of Control Motor Driver
(a) Refer to Figs. 4.1 and 4.2.
Adjust VR602 and VR603 on the Control P.C.B.
Ass’y to locate approximately at the middle of the
variable range. Then turn ON the Power switch.
VR602 (for cam position stop)
VR603 (for cam position play)
Press the Stop button to set the N-480Z in Stop
mode. Adjust VR602 (for stop) so that the ‘“S’’ mark
on the Cam corresponds to the pointer on the
mechanism chassis.
Press the Play button to set the N-480Z in Playback
mode.
(Cam will rotate, and the position marked with “PY”
comes to the pointer.)
Adjust VR603 (for play) so that the “‘PY” mark on
the Cam corresponds to the pointer.
Repeat above (b) and (c) 2 — 3 times so that the “’S””
and “PY’’ marks on the Cam correspond to the
pointer accurately in Stop and Playback modes
respectively.
(This adjustment is required because the position
adjusted by one volume will be slightly changed when
the other volume is adjusted.)
Set the N-480Z in F.F., Pause, or Record mode by
pressing each button and check to insure that the
pointer is in a range of “F”, “PS”, or “R” mark
respectively.
If out of the range, precise adjustment for each posi-
tion according to (2) Offset Fine Adjustment of
Control Motor Driver’ will be required.
(b)
(d)
{e)
(f)
(2) Offset Fine Adjustment of Control Motor Driver
Adjust only if a satisfactory result is not obtained in ‘’(1)
Offset Adjustment of Control Motor Driver”. This adjust-
ment is made by changing the value of the fixed resistors
on the Logic P.C.B. Ass’y.
Note: The value of voltage is typical value.
(a) Observation Point of Reference Voltage
Observe the each voltage at the sliding contact of the
Cam Control Volume VR601 (10 kQ) in Stop, Fast
(F.F. or Rew.), Pause, Record and Playback modes.
Note: When Record and Play buttons are pressed to
set the N-480Z in Record mode, the Cam is
first set to the record position in a short
period of time then stays at the play position.
Therefore to keep the Cam at the record
position, following procedure is required:
Short both leads of capacitor C417 (2.2
BF) on the Logic P.C.B. with a jumper
wire, then press the Record and Play
buttons.

(b)
(c)
(d)
1)
2)
3)
4)
5)
Reference Voltage
Reference voltage at the sliding contact of VR601
(Cam Control Volume) in each mode is as follows:
Mode Reference Voltage (Typical Value)
V
Record 16 = vio4y
Stop 15V z
bs V 40.25 V
Fast (F.F./Rew.) 13.5V
Pause 10 V
2.5V +0.4V
Play 7.5V
Resistors for Adjustment
Mode Ref. No. Typical Value
Stop
R466,R464
9.1
kQ2
(F),
15
kQ
(F)
Fast (F.F./Rew.) R463 56 kQ
Pause R410 680 kQ
Play R411 120 kQ
Record R494 150 kQ.
Adjustment Procedures
Press the Stop button to set the N-480Z in Stop
mode. Adjust the value of R466 and R464 to obtain
15 V (40.6 V) at the sliding contact of VR601.
Note: When R466 and R464 are adjusted, the refer-
ence voltage in Fast (F.F. or Rew.) mode is
changed. Therefore, re-check of the reference
voltage in Fast (F.F. or Rew.) mode is re-
quired. If the reference voltage is out of the
range, readjustment of R463 according to
next step 2) is necessary.
Set the N-480Z in F.F. mode, then adjust the value of
R463 so that the voltage of VR601 will become
lower by 1.5 V (+0.25 V) than in Stop mode.
Press the Pause button to set the N-480Z in Pause
mode.
Adjust the value of R410 to obtain 10 V (+0.4,
—0.15 V) at the sliding contact of VR601.
Set the N-480Z in Playback mode, then adjust the
value of R411 so that the voltage of VR601 will be-
come lower by 2.5 V (£0.4 V) than in Pause mode.
Short both leads of capacitor C417 with a jumper
wire.
Set the N-480Z in Record mode, then adjust the
value of R494 so that the voltage of VR601 will be-
. come higher by 1 V (+0.4, —0.2 V) than in Stop
(3)
(a)
(b)
mode.
Note: Remove the short of C417 after completion
of adjustment.
Cam Timing Adjustment
Remove the wires from the Control Motor terminals
to set the motor open.
Without loading a cassette tape and with pressing the
record protecting switch with your finger tip, press
(c)
(d)
(e)
(f)
4.2.
(1)
(2)
(3)
(4)
Decrease
the Record and Play buttons to set the N-480Z in
Record mode.
Turn the Cam and bring the “PY” mark toward the
pointer by hand.
Reel Motor will rotate before the “PY” mark reaches
the pointer.
Adjust the value of R452 so that the voltage at the
sliding contact of VR601 becomes 9.7 V (40.3 V)
when Reel Motor starts rotation.
Observe the mute signal at the 0424 collector.
Turn the Cam referring to above step (c) and check to
insure that the voltage at the sliding contact of
VR601 is 9.5 V (40.3 V) when mute is released (mute
signal changes from H to L).
(This voltage is determined by the adjustment of
R452 in above step (c).)
Observe the (Play + Pause)-Position signal at the
Q418 collector.
Turn the Gam referring to above step (c) and adjust
the value of R445 to obtain 11.2 V (+0.4 V) at the
sliding contact of VR60O1 when (Play + Pause)-Posi-
tion signal changes from L to H (bias oscillation will
begin).
Upon completion of above adjustment, re-connect
wires to the motor terminals.
Tape Speed Adjustment
Remove the Top Cover Ass’y referring to item 2.1.
Connect a Frequency Counter to the Output Jack.
Load a 3 kHz Speed Wow/Flutter Tape (DAO9006A)
and play it back.
Referring to Fig. 4.3, adjust the Tape Speed Adjust-
ment Volume (VR501) incorporated in the Capstan
Motor to obtain 3,000 Hz on the Frequency Counter,
CCW: Motor drives slowly.
CW: Motor drives fast.
oS
Increase
Capstan Motor
Fig. 4.3

4.3. Record/Playback Head Tilt Adjustment
Note: On items 4.3 — 4.8, refer to Fig. 4.4 flow chart.
Refer to Figs. 4.5 and 4.6.
(1) Load a Tilt Check Gauge M-9036 (DA09036A) in the
N-480Z.
(2) Clip the grounding terminal of the Tilt Check Gauge
with one end of the cord with clip, and the chassis of
the N-480Z with the other end.
(3) Remove the Height Gear.
(4) Set the N-480Z in Play mode. Check to insure
whether the Beacon ‘‘Upper” or “Lower” is illumina-
ting. In order not to give damages onto the record/
playback head surface, push the slide knob of the
Gauge to the direction of an arrow mark, then return
it to the original place to be in contact with record/
playback head surface after Play mode is securely
locked.
(5) Check to insure freedom from contact between the
Gauge and pad lifter.
(6) Beacon ‘‘Lower” will light on when height adjust-
ment screw turned clockwise but ‘Upper’ when
counterclockwise. Adjust so that both “‘Upper’’ and
“Lower” will light on even when you move the slide
knob to the direction of an arrow mark and then
return it to the original place.
(7) Set the N-480Z in Stop mode and fit the serrated
Height Gear. Then set the N-480Z again in Play mode
and insure 2 Beacons ‘‘Upper” and “‘Lower”’ are illu-
minating.
\f not, (3) through (6) will have to be repeated till
satisfactory results are obtained.
Tilt Check Gauge
M-9036
Record/Playback Head
Tilt Adjustment
Head Base Stroke
Adjustment
Remove Head Mount Base
Ass'y
Tape Guides and Erase Head
Stroke Adjustment
Erase Head Height and
Tilt Adjustment
Assemble Head Mount Base
Ass'y
Back Tension Adjustment
Record/Playback
Head Tilt Check
Stroke Check Gauge
M-9038
EH Stroke Check Gauge
M-9051
EH Tilt Check Gauge
M-9040
Tension Arm Adjustment
Cassette M-9056
Back Tension Gauge M-9055
Tilt Check Gauge
M-9036
Head Base
Stroke Check
Stroke Check Gauge
M-9038
Record/Playback Head Height
Adjustment and
Azimuth Alignment
casein De
Rec./Play Head
Lower Upper
Height Gear
Height Gear Stopper.
| Height Adj. Screws
© TN iv 0 Wo
\peight Adj. Screw
Fig. 4.5
Fig. 4.6
13

4.4,
Head Base Stroke Adjustment
Refer to Fig. 4.7.
Note: Before you conduct “Head Base Stroke Adjust-
(1)
(2)
(3)
(4)
ment”, adjust with a “Tilt Check Gauge’’ to insure
freedom from tilt on the record/playback head.
Load a Stroke Check Gauge M-9038 (DA09038A) in
the N-480Z.
Set the N-480Z in Play mode.
Check to insure whether the “P” pointer on the
Stroke Indicator locates between 2 lines as marked on
the Stroke Check Plate.
If the record/playback head stroke is noted to be mis-
aligned, adjustment can be made by moving the
stroke adjuster assembled in the head base assembly
(either forwardly or backwardly),
4.5. Tape Guides Adjustment and Erase Head Stroke
Adjustment
Remove Head Mount Base Ass’y referring to item 2.22.
Refer to Figs. 4.8 and 4.9.
(1)
(a)
(b)
(c)
(d)
(e)
(2)
(a)
(b)
(c)
(d)
(e)
Supply Tape Guide Height Adjustment
Load an EH Stroke Check Gauge M-9051 (DAO-
9051A) in the N-480Z.
Set the N-480Z in Play mode.
Slide the Supply Tape Guide Check Bar down against
the supply tape guide, thus check can be made on
supply tape guide height.
If the supply tape guide is misaligned, the Supply
Tape Guide Check Bar will not come into the supply
tape guide. If such is noted, turn to adjust the height
adjustment nut A till the Supply Tape Guide Check
Bar is accepted by the supply tape guide.
If the above are insured, set the N-480Z in Pause
mode, then in Play mode to see whether adjustments
are appropriately made. If not, (b) through (e) will
have to be repeated till satisfactory results are ob-
tained.
Take-up Tape Guide Height Adjustment
Load an EH Stroke Check Gauge M-9051 (DAO-
9051A) in the N-4802Z.
Set the N-480Z in Play mode.
Slide the Take-up Tape Guide Check Bar down
against the take-up tape guide, thus check can be
made on take-up tape guide height.
If the take-up tape guide is misaligned, the Take-up
Tape Guide Check Bar will not come into the take-up
tape guide. If such is noted, turn to adjust the height
adjustment nut C till the Take-up Tape Guide Check
Bar is accepted by the take-up tape guide.
If the above are insured, set the N-480Z in Pause
mode, then in Play mode to see whether adjustments
are appropriately made. If not, (b) through (e) will
have to be repeated till satisfactory results are ob-
tained.
aL
Play Mode
(3)
(a)
(b)
(c)
(d)
Fig. 4.7
Erase Head Stroke Adjustment
Load an EH Stroke Check Gauge M-9051 (DAO-
9051A) in the N-480Z.
Set the N-480Z in Play mode, thus check can be
made on erase head stroke through the EH Stroke
Indicator.
Check to insure whether the erase head surface is
aligned with red line on the EH Stroke Indicator. If
not, adjust the erase head stroke by loosening 2
screws B that assemble erase head and erase head
plate.
After completion of adjustment, 2 pcs. of screws
shall be locked with lock tight paint.
Supply Tape Guide Check Bar
Fig. 4.8
Take-up Tape Guide Check Bar
EH Stroke Indicator

4.6.
Refer to Figs. 4.10 and 4.11.
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
Erase Head Height and Tilt Adjustment
Remove Head Mount Base Ass’y referring to item
2.22.
Load an EH Tilt Check Gauge M-9040 (DA09040A)
in the N-480Z.
Set the N-480Z in Stop mode.
Check to insure whether one of the 3 Beacons is illu-
minating. Look down the mirror as shown by an
arrow mark and slowly turn the Screw ‘‘Height’’
counterclockwise (or clockwise) so that the two hori-
zontal lines on the mirror will become superposed on
the line (in different color) of the erase head, and
check to insure whether Beacon ‘’1”’ is illuminating.
Turn Screw “‘Tilt’’ counterclockwise (or clockwise)
to light on Beacon ‘2’. Excessive turning will cause
the Beacon ‘’1” to light off. Adjustments of Screw
“Tilt” will therefore be conducted till both of the
Beacons ‘'1’’ and “2” illuminate.
Turn Screw “Azimuth” counterclockwise (or clock-
wise) to light on Beacon ‘’3’’, Excessive turning will
cause either Beacon “1” or “2” to light off, and
therefore adjust Screw ‘‘Azimuth” until all of the 3
Beacons ‘'1"’, 2’ and “3” illuminate.
Check to insure whether the horizontal line on the
mirror corresponds to that on the erase head. If not,
(4) through (7) will have to be repeated till satis-
factory results are obtained.
After completion of adjustment, 3 pcs. of screws
shall be locked with lock tight paint.
Note: Before use of this gauge, check to insure freedom
from dust or dirts, or overflow in the groove of
the erase head surface.
4.7. Back Tension Adjustment
Refer to Figs. 4.12 — 4.14.
(1)
(2)
(3)
(4)
(5)
Load a Tension Arm Adjustment Cassette (DAO-
9056A) in the N-480Z referring to Fig. 4.12.
Set the N-480Z in Play mode.
Bend the Back Tension Arm with pliers so that the
gap between the Cassette Holding Spring assembled
on the Head Base Ass’y and the Back Tension Arm
becomes 0.5 mm as shown in Fig. 4.13. Do not bend
the top of the Back Tension Arm.
Load the Back Tension Gauge (DAQ9055A) in the
N-4802Z.
Set the N-480Z in Play mode and read the torque
value of Back Tension Gauge.
If the value is in a range of 6 g-cm to 10 g-cm, adjust-
ment is not necessary. If not, change the installation
point of the Back Tension Spring as shown in Fig.
4.14, and obtain the torque of 7 g-cm to 9 g-cm
range.
15
aN
a WN 4 ed S irror
TANK? Mire
Fig. 4.10
Mirror
Azimuth Tilt Height
DAQ9056A
Tension Arm
Adjustment Cassette
Fig. 4.12

Decrease
Increase
Increase
Fig. 4.14
Fig. 4.13
4.8. Record/Playback Head Height Adjustment and
Azimuth Alignment
Refer to Fig. 4.15.
(1) Connect a VTVM to the Output Jacks.
(2) Load a 1 kHz Track Alignment Tape (DA09007A)
in the N-480Z.
(3) Set the N-480Z in Play mode.
(4) Turn the Height Gear until the outputs of both
channels become minimum.
(5) Load a 15 kHz Azimuth Tape (DAQ9004A) in the
N-4802.
(6) Set the N-480Z in Play mode.
(7) Turn the Azimuth Alignment Screw until the outputs
of both channels become maximum.
(8) Repeat (2) through (7) one or two times to obtain
optimum performance.
Toke-up
Tape Guide Adjustment
Record / Playback Head
Height Adjustment
Record / Playback Head
Azimuth Alignment | Supply
Tape Guide Adjustment
tH |
iW
|
mn I
df
Fig. 4.15
16

4.9. Tape Travelling Adjustment
The adjustment shall be made with a modified version of
the current type EXI! C-90 as shown in Fig. 4.16 (error
will be made if a previous type Tape Travelling Cassette
(DA09011A) should be used for this purpose).
While modifying an EXII C-90, the tape guides in the
cassette housing shall be kept protected to avoid tilt.
Check shall be made in the following procedures:
(1) An EXIl C-90 tape thus modified shall be loaded
onto the N-480Z.
Release the back-tension (rotate the Supply Reel and
feed out some length of tape) and set the N-480Z in
Play mode.
In this juncture, check to insure whether the tape is
free from waving or slippage from the tape guide.
When the modified EXII C-90 is played back, check
to insure whether the tape is freedom from waving
from head surface or at pressure rollers.
If either of waving or slippage from the tape guide
should be noted, adjustments of ‘4.3. Record/
Playback Head Tilt Adjustment”, ‘4.4. Head Base
Stroke Adjustment”, “4.5. Tape Guides Adjustment
and Erase Head Stroke Adjustment”, ‘4.6. Erase
Head Height and Tilt Adjustment’, ‘4.7. Back
Tension Adjustment”, “4.8. Record/Playback Head
Height Adjustment and Azimuth Alignment”’, etc.
will be required.
As a case may be, the said waving or slippage may have
been caused from defective supply Pressure Roller Ass’y
or Take-up Pressure Roller Ass'y without parallel contact
with capstans. If such are noted, the Pressure Roller
Assemblies will have to be replaced.
Further, excessively weak take-up torque or strong take-
up torque may cause defective tape travelling.
The N-480Z is intended to be an adjustment-free Model,
however if the similar matters as above should be noted,
please replace the Reel Hub Ass’y to obtain appropriate
take-up torque.
(2)
(3)
(4)
(5)
17
4.10. Record Switch Linkage Adjustment
(1) Set the N-480Z in Stop mode.
(2) Loosen the screw of the Record Spring Holder, and
shift the Record Spring Holder in order to remove the
looseness of the Linkage Wire as shown in Fig. 4.17.
Then tighten the screws for fixing the Record Spring
Holder. (In this case, the Record Switch should be
positioned at play side. If on the record position, it
will be defective.
Set the N-480Z in Record and Pause mode.
Check to insure that the gap between the top of the
wire and the Record Spring Holder is approx. 1 mm
as shown in Fig. 4.18.
(Check that the Record Switch is in record position.)
Upon completion of the above adjustments, apply a
quantity of lock tight paint.
(3)
(4)
Linkage Wire
Fig. 4.17
approx.
Imm
Fig. 4.18

4.11. Flywheel Holder Adjustment
(1) Refer to Fig. 4.19.
Tighten the Thrust Screws until the gap between the
Flywheel Assemblies and Thrust Screws becomes
minimized when both of the Capstan Shafts are
moved backwardly and forwardly (the Thrust Springs
between the Capstan Flanges and Flywheel Thrust
Caps are in a flat state).
Excessive tightening of the Thrust Screws however
will give damages on the Flywheel Assemblies, to
which careful attention is invited.
(2) Return the Thrust Screws by 1/2 turn.
(3) Fixing the Thrust Screws with a screwdriver, lock the
Lock Nut.
(4) Apply a quantity of lock tight paint to the Thrust
Screws.
4.12. Eject Wire Adjustment
(1) Referring to Fig. 4.20, insert a 1.5 mm spacer be-
tween the Eject Arm and Eject Stopper by turning
the Eject Arm in the illustrated direction, then set
the N-480Z in Playback mode.
(2) With pushing the Eject Arm by hand, loosen the
screw and then pull the Eject Wire in the direction of
the arrow until it stops as shown in Fig. 4.21.
(3) Tighten the screw, then apply a quantity of lock
tight paint.
4.13. Lubrication
N-480Z is a lubrication-free cassette deck except when
parts are replaced. Apply the following lubricant for each
replaced part:
(1) LAUNA #100
Capstan Shaft
Pressure Roller Shaft
Thrust Cap
(2) FLOIL GB-TS-1
Reel Hub Shaft
Thrust portion on the Capstan Shaft
FLOIL GB-TS-1, made by Kanto Chemicals Co., Ltd.
in Japan,
We suggest that you use the above or equivalent type.
If unavailable please contact Kanto Chemicals Co.,
Ltd., 2-7 Kanda Suda-cho Chiyoda-ku, Tokyo 101
Japan.
(3) Silicon Oil #3000 CST
Air Damper Piston
Note: Excessive lubrication may cause defective
damper action as the 0.2? hole at the end of
the cylinder may be filled with oil.
Loosen
\,
T
ne | Lock Nuts
Flywheel Holder Thrust Screws
Fig. 4.19
approx.
Eject
Stopper
Fig. 4.20
Fig. 4.21

5.
PARTS LOCATION FOR ELECTRICAL ADJUSTMENT
L203 MPX Fliter
L103 7,
Bias
Playback Level
ot VR101
Control P.C.B.
= &
VR6O03 VR6O2
Play Stop
id VR801 i‘, Level
id VR701
Peaking
L104 L204
2a @ ©
T301
Bias Osc.
Frequency
x x x * x
pol
oleld
weld)
.105{@
|
t+—-VR8O3I
VR8O;
je
[-VR704
L-VR703I
--vR804
&
eS
|
Rec, Cal.
Switch P.C.B.
1ZX
ISX
7 .
|EX
4
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Fig. 5
19