Nakamichi RX 505 Service Manual

Page 2

CONTENTS

1. General ...................................................................... 2
2. Mechanical Adjusianenta .......................................................... 2
2. 1. Preparation for Adjustment ............................................. 2
2, 2. Mechanism Control Cam Adjustment .......................................... 3
2. 3. Reel Motor Speed Adjustment in Play Mode ..................................... 3
2. 4. Record Head and Playback Head Tilt Adjustment .................................. 4
2. 5. Head Base Stroke Adjustment ............................................... 5
2. 6. Erase Head Stroke Adjustment and Tape Guide Height Check .......................... 5
2. 7. Erase Head Height and Tilt Adjustment ........................................ 6
2. 8, Back Tension Adjustment ................................................. 6
2. 9. Playback Head and Record Head Height Adjustment and Azimuth Alignment ............... 7
2. 10. Record Head Stroke Adjustment ............................................. 7
2 11, Tape Travelling Adjustment ................................................ 3
2 1 2. Flywheel Holder Adjustment .............................................. 3
2. 13. Tape Speed Adjustment ................................................... 9
2. 14. Slide Bare Position Adjustment .............................................. 9
2.15 Lubrication ........................................................... 9
3. Parts Location for Electrical Adjustment ................................................ 10
4. Electrical Adjustments and Measurements ............................................... 11
4. 1. Adjustment and Measurement Instructions ...................................... 11
4. 2. Playback hequency Response Adjustment ...................................... 13
4. 3. Dolby NR Circuit Check .................................................. 14
6. Mechanism Au'y and Pam List ...................................................... 15
5. 1. Synthesis ............................................................ 1 5
5. 2. Front Panel Aesy (A01) .................................................. 13
5. 3. Chassis Asa'y (A02) ...................................................... 1'7
5. 4. Front Panel Escutcheon L Assy (801) ......................................... 13
5. 5. Front Panel Escutcheon R Assy (302) ......................................... 19
5. 6. Rear Panel Assy (303) ................................................... 19
5. 7. Upper Angle Ass'y (Bot) . 20
5. 8. Cover Plate Assy (305) ................................................... 20
5. 9. Synthesis Mechanism Ass'Y (306) ............................................ 21
5. 10. Lid Cover Assy (C01) .................................................... 21
5. 11. RN Mechanism Assy (D01) ................................................ 22
6. 12. Mechanism Ass'y 3x505 (new ............................................. 22
6. 13. Motor Holder Any (E01) ................................................. 22
5. 14. Slide Chassis Assy (E02) .................................................. 23
6. 15. Main Chisel: Assy (E03) .................................................. 23
5. 16. Sub Mechanism Assy (F01) ................................................ 24
5. 17. Record Protector Switch Ass'y (601) .......................................... 24
5. 18. Flywheel Holder Aasy (H01) ............................................... 24
5. 19. Sub Mechanism Chassis Asay (H02) ........................................... 25
a. 20. LockAm L Assy (H03) , . . ............................................... 25 1
5. 21. Lock Ann R Asq'y (H04) .................................................. 25
5. 22, Main Mechanism Chassis Ass'y (H05) .......................................... 25
5. 23. Head Mount Base Ass'y (101) ............................................... 25
6. 24. Supply Pressure Roller Ass'y (102) ............................................ 27
5. 25. Take-up Pressure Roller Ass'y (103) ........................................... 27
5. 26. Head Base Aisy (104) .................................................... 2'1
5. 7.7. P-BL Playback Held Aasy (J01) ............................................. 2'7
5. 28. R»8L Record Heed Assy (J02) .............................................. 27
6. Mounting Diayaml And Parts List .................................................... 23
6. 1. Power Switch P.C.B. Ass'y ................................................. 23
a. 2. Fuse P.C.B. Assy ....................................................... 23
6. 3. Lid Lamp P.C.B. Assy .................................................... 23
6. 4. TS Pulse P.C.B. Ass'y .................................................... 28
6. 5. Volume P.C.B. Assy ..................................................... 29
6. 6. Indicator P.C.B. Ass'y .................................................... 29
6. '7. Switch P,C.B. Asay ...................................................... 25
6. 3. Control P.C.B. A Assy ................................................... 30
6. 9. Control P.C.B. B Alsy .................................................... 31
6. 10. Dc Power Supply P.C.B. Aasy .............................................. 32
6. 11. Dolby NR P.C.B. Auy . . . f ............................................... 33
6. 12. Logic P.C.B. Ass'y ...................................................... 36
6. 13. MainP.C.B. Assy ....................................................... 37
7. Schematic Diagrams ............................................................. 33
7. 1, Attention to Servicemen .................................................. 33

Page 4

(2) flaw to [Aid n Gnu.
(h) 119: me Recnxd Protoctox much I: shown ln F11. 2.2 to
allow an loading a! l Gnu.
(b) Load | Guns: u know:
1) Plus: I Gnu instead of a cassette two.
2) with push! the Gun with ynur men. push the
Elect/Load button to lag: the Gauge.
Thu Gnu-em Compartment mtomeuuny duh! ln ud
than tht Lack Arm: (man a La) lbcuxo m: Gun.

(3) After Adm-taunt

After adluymunt. menu the thaw mp: u follow;

(I) Push the Beet/Load huttan to we mu. me Cmtte Com-
putmanl and move the (image.

(b) Remove the MM 0! the Record Pmucwr twitch.

(1:) Mount tho F05 (Cover Flaw AM) and F03 (Salute cue
Axy).
Nate: Myth: waiter) must be placed on the «wall place;

(d) Pugh u:- Elect/Load button to slide [:1 the Cassette Comm
mam».

(3) Tuna flu Power .lwltah so OFF.

(1) Mount the Front Cover.

2.2. nebula: Control Gun m0!

(1) othn Adm-m of Cantu! Motor We:

(8) Rolex lo I'LL 2.8.

Adlult VREO2 had vneox an th- Loflc P.C.B. Alf! in
loan appmlmetely it the meal: ol the "mm. flue.
Than tun ON the Power mach.

V3802 (lot Cam podflon 9113')

mum: (for Gun position no»)

0:) Pa;- the stop button on :51 the cassette deck 1:: Stop made.
Adjust W803 (lot my) to thu the "S" mark on the Ohm
correspond: to the pointer on the mtchahlnn dual;

(1:) hen the Hay button to set the sum deck in Phylum
mode. (Gun will rotate. Id the position naked VIM: 'PY"
come: to the pointer.) Adina vneoz (for play) so that the
"1!" mick an the Ohm commands to the points.

(a!) input on (b) end (a) 2 - 3 Um so that the S" ud
W" mat: on the Can: conecpond to the palate! nwmuly
1:: stop And Playbeak model ngecfivaly.

(lhls Idluctmant l- noulretl lacuna the hadfioh Idlurtnd by
one volume will be may changed whan the othax volume ls
mime.)

(a) Set the caustic fleck ln RF Pun-e. cr Cuemcde by Dressing
and: button.
choah to huun that th: twink! l: In I me n! F. PS",
ox CU" math respectively.

(0 u out or the me. and» adlusluant to: sub position
manual tn "(2) om»: Fine Adlument o! Cannol Mom
deet will be nauhad.

(2) other Flue Adjustment 0! Control Motor Dam

Adlufl- only Ll n nudnwry suit l5 not nhtllned Ln "(1) one:
Adluxtment a! Conunl Motor Driver". Th1: Jun-meat l: nude by
alum; tho value a! the fixed slum: on the Lode P.C.3.
Note: Th0 vuue ofvoltue h mien! vdue.

(I) ahmtlon tom of Reference Vanna

Ohsuve the and: voltage at the human cnnhct o! the Gun Control
Volume vneoa lh stnp. Put (RF. nr fiw.).Pau.-u and Huh-ck
modes.

(h) Etienne. Velma
Romance voltage u the mom: contact a! VRGOA (Gun Control
Volume) ln each made LI I: follow:

Mode Romulus Volt-ale TV in! Value)

stop 0 V
1- 2,0 V 10.25 V
Ful- (RE/Raw.) -2.0 V

Plum 6.5 V
j- 2.8 V 10.4 V
Play -9.1 V

Lat! Am
ktll

Hume Prat-aver
, Snitch

I'll. 2.2

P18. 1.3

((2) new for Adlai-went

Mode Rel. No. Tyglul Val;
Fm (ER/Raw.) 11655 22 m
Pause R649 7E3 kn (17)
PM 5,653 to kn

(d) Adlumeht hoe-am

1) Set the use!» deck in stop mode, then duck to lawn thnt
tho voltuc at the Mn: contact of vneoa h 0 V (10.8 We

2) Set the cassette deal: In RF. mode. then Minn the value of
R356 no thlt the voltuu At the alldlnl cont-nut a! VRSOS WU]
bacon": lower by 2.0 V (10.26 V) thm In Stop mode.

3) has: tho Plus button to at the matte dank in Pause
mode. Adjust the vhlun n1 R849 to obtain -6.6 V (+0.4.
--O.16 V) at the slum contact at V3608.

A) set the unfit-e dank Ln Plhybu-J: mode. then uflust the vulue
a! 3868 so that the venue at the sum contact of VRGOE
will become lower by 2.5 V (30.4 V) than in Plus mode.

2.8. 26:! Motor: 89nd Adlultnmnt In Play Mode

(1) Connect 1 DC voltmem to TPGOZ ad GND an the Loilc
ROS. Asiy.

(2) Without loudSn a cassette has, set the unset duck in Pity
mode.

(8) Ad! VRBO4 an the Lone 9.0.3. Auv to obtain *4 V on
the DC voltmeta.

Page 5

2.4. Record Bud ammonium 1m AMem (B) set the use! deal: In stop mode Ind 11: both of flu

Note: On item: 25-110, nterto Fm. 2.4 flow ohm. "mud Height Gear; The-n st the can. deck Ill-n in
Refer to Flu. 2.6 And 2.5. Play mode and ham All of u 4 Banana ex: Mach; II
(1) Loud A Tm Check Gauze M-eoae (DAD90293) In the net. (a) uncut!) (7) will have no be melted an autumn
cuum deck. , unit! He obtained.
(2) Clip the mundlni mum of the Tilt cheek Gauu rim one
and at the cord with div. and ma thud: at the cum deck "no I; 84mm NIIunlAI.S¢IA-|Al r

w): the other end. 7 ,,,"' -"--

(8) Remove both 01 the Roma Gun.

(0 Set the MM deck In P14: node. caeaw lam name: 0 J" a a p . .
m Beacon; Pleyback and Unver or Lowef and Record 9 df @, Q) .0 e a
Head "Oman or Lower as Human]. la order not to n a a 0
five damn: onto we head when. push both A! Aldo o o
knob: 01 the G-uu m the Amman a! Anew mule. then I
nmm them in the mum! piece to be Lu contam- whh neord as
heui end pkybuzk head We: my P10 mode I: calmly
locked.

(5) check to luau. heedom ham content between the Gauze fi fl
and pm um. © Q

(a) Bum: mutant and Lower" will we on when haunt © @
Adjustment. knew (P) tux-mad dockwln but Phybuk Held
"Upper when oountordockwm. Adina u that bod:
Upper" Ind 1ower will M: an Ivan-hem you move the
slide knob to the direction a! :12 snow mm Ind men tum
11- to M 0W place. -

(7) Sun: procedures will epply La ch- Beuom Record Hand
"Upper and Lower". except to: the 1mm lumen: F11. 2.5
screw (R).

W Goo: 1n:
I
hand Heed Ind Puybltk Til! Cluck Saul: m M! 5w: pm
used m: Min-mu:

-5039 my: uj Scam W
Hall 3... 5mm Mjuunult

,

Unpu Lc-u Upon u":
Hanna «en New Hm

flu ow

Such chm mug: w an: a»: man
5'9 ' ' A sum um

Recon Bud
Stroke 13th

iauve find Home
me Au'y

Renew Keel noun:
a. Au'y

FM. 2.6
neeord need
inn-nuuuohmum. u sunk. Check G-u'a Record Bud Scul-
md Tun Guide Hugh: Check Hun mam: mt Ging-

m nu emu can Ana-me and Home
name a.» Im'y

|____

nuln Ln Juneau: Can-ecu 15-9056
uek knew: cum 5-7055

sun mud Isiah: n4
n1: Mjnlnen:

Mutable Ind Haunt
he: An"

leek Ten-Lon Adj-41mm:

Hunt! End)
Pllybeck and
n1: Chm]:

m: Check CHI
IP90

lend an.
51.202. chuck

Suak- Ehaek Gauge
)1-907

Pink-ck Hed Blight
Minimal my
mum. Allyn-um

*1

[seen] But any"
Adj-lawn: um
Axlmuh Alumni:

Fig. 2.6