Nad 5120 Service Manual

Page 1

NAD SERVICE
MANUAL

MODEL

5120

BELT- DRIVE TURNTABLE

Page 2

NAD 5120

CONTENTS

OPERATING CONTROLS
AND FEATURES:

Figure 1: Front view
Figure 2: Back view

Figure 3: Tonearm

Figure 4: Tonearm features

SPECIFICATIONS
DISASSEMBLY

ALIGNMENT

Figure 5: Disassembiy of case top (plinth)
Figure 6: lntemal parts and features

Figure 7: Electrical diagram

Figure 8: Pickup mrtridge wiring diagram
Figure 9: Exploded view; parts identification

MECHANICAL AND ELECTRICAL
PARTS LIST

PAGE

14

A

8-9

10
10
11-12

13&15

SERVICE MANUAL

Page 9

3.00 FUNCTION CHECKING

1. Tonearmlitter[43]and [441:1'hestyius shouid
dropontherecordgroovesfromtheliftedposition
withint.5:0.7seconds.lfltdropstaster,add
moresilioonoiitotheinsidesurfaceoftheliften
lfitdrops slower. removesomeotmeoll. After
anyoperationon littermoveitstlghtty upand
downandtumltseveraltimeshordertodistrib.
utesilicon oil uniformly and toensure perfect
iifteroperation.,

Theheightolthetoneanniiiterisadustabieto
compensate for different cartridgebodyheights.
liacarhidgehasbeeniMiledintheannfim
thethreadedshaftinthetopottheiiftersomat
thestyiustiplsSto7mmabovetherecordsur-
facewhenthearmisintheraisedposition.

2W28witching-oflmedlanismshoukt
not require anyediustrnent. Onlythestartingposi-
tlonofrotatingswitchlng-otfleverlfihhouldbe
checkedasiollows:
Movethetoneann[62]towardsmerecordwnter.
Mmthedstamebetweenthestymsandme
spindlels approximately 152mm (6") (iustbeiore
rimotLPrecord).visiblerotationofswitching-ofi
levermslpuledbyrodlazlmustbeobserved.
Mienthestyiusieeamm(2'/z')awayfromthe ~
reocrdmntenthedistanoebetwaenthestopper
tlptaslonswitching-oflieveranddteplattermds
shouldbeexacttyi9m(%").Toensureptoper
fumtionoitheswitching-oflieverthesloppermc]
mementnustbeabsolutelytree.

3.Antleltatlng(eideforcecompeneetion):The
antiskatlngissetdurlngprodtmonsothatitsside
torceisapproximatelytmtloiverticaitracidng
force(VTF).iftheaarnedataaresetontheanti-
eketingl22]anthF[72]diels.Theantlskating
torcesimldbealmoflconstantwhenmovlngtne
toneannacrmthereoordgroovee'field.The
antiskatingstartstooperateattherinofmcm
(12')diametarrecordonty.M1enthearmisposi-
tionedbetweenrecordandannreaJheantiskatv
ingisoutotfmctionandtheV'lFcanbesetln
tttisplaceeasiiywithoutmysidecomponem

4.8peedchtnge:0hae§5[1]istobefixedbytnne-
portmt[37|. toppiattarfsremoved. Checkwhether
thebeltslbseasityirornonepuleystagetothe

otherwithouttwistingorpermanenttytouching
fheslider.

smileypotition: Thedistmcebetweentheiower
surfaceoflhetoppweystagelfllorhfland
iowerverticalpartofthestiderlslshouidbe
02-O.3mm;eetitwithstealplate0.25mm
thickinsertedbetweenthoseparteJtthebeitmbs
www.mmdpulieytmon
motorshaft

fiConholeutetophrob[42]:Whentheuntable
isoff.theimobmustbeverticai.wmnplaying.
mementirtatacestodienthorizontalyAtter
utmingttbedtabouttsflheknobretumselowfyto
ofl-poeldmbeingpulledbysptingMIJhemm-
tableismenswitchedoflandthetoneannliited.
Thelmobretumtlmetotheotfvositionshow
take apprmdmateiyt second. It less. somesiiicon

ZTbneermcheckzttthetonearmwiilbemred
weide-downformorethaneiewminutet,
untcrewtheDVAdarnpingrodltaNthetmeli
threadedrodlocetedlnthecenterotthetreck-
ingtorcewheeountilitpromrdeeatleaetzmn
(Vu')ebovethewheet.hordertoeealtheol
diathermdpreventieekage.

Check the viscous oil amount'n thedamping
chamberlzolJhelevelshouldbebetweenthe
marksOandt onthe dampingscaie(0) which
correspondstoernmheightofthedampimoil.
lncasetheoilhasleakedomitshouldberefilled
withNADoil. PartNo. 8AV88600,orwithauniver-
set one having viscosity 180.000 0P (9.9.. Wacker
AK18000).Theoilshouidberefiiled throughthe

' danplngchamberapertweafterunscrewlngme
dampingrodbyusingaoommsyringe.
itacartridgehasbeeninstailed.twnthetracldng
lorcewheeltobalancetheann.andtheneetthe
vertical tracking force. (Ifthewhite DVA tuning
screwobstmcnthemotlonofthecounterweight.
wwiluteashorterscrew.)tfthecartridgeweighs
Ieesthan-tgramsandcannotbebalenced,mtate
thecounterweightassambiytao degrees. (10min
theDVAuingsaew.prm,downhardonthe
hacldngforcewheelinordertoflattenthespring
washerbeneath it. and rotatethe assembly.)
MummeDynamici/ibrationAbsorbeNDVA)
asdescribedintheDVATuringleaflet, orme
nominaleettingaoitOl-lzforthemtgfrequency
anleorthedamping ratio. (lneachcase.aiign
thetopottheadjustingscrawwiththedesired
ecaiesetttng.)
Checkthegeometncallgmnentoithecartridge
Mthrespecttorotationandoverhangbeecus-
tomerinstmdionmanuai).UseanaignMpro-
tractortochecittheoftsetangieotthecartridge.
Checktheconnectionofthewiresatthebackct
thecertridgeforasnugfricticnfitwinptotlghten
itnecessary)and.correctcomectionaccordingto
thestandardcoiourcoda.

emmmdmmm

«mention: Inoperatingposition. whentransport
Mandpiatterarereieased. andtherecordand
toneannareputon.thevertlcalclearancebe-
twoenthelowersurfaceofthembbermaflw]
andthecasetopmflamundthewholerimmust
be3mm(/o")minimum.Thehorizontaiclearance
betweenchassis-partsandthemetopldfl
ahwldbealeoSmm. Verticalclearmcecanba
increasedorreducedbyinsertingorrernoving
wasrmsmmmaenrubbercushlonsm
amataesieholdermrbybendngtheholder
endsslehflv-

9.31mai-to-noieeratio:Meamw-iththetestrec-

0rd (Dennon X6 7004) accordingtoDiN-tSISM
Standard. WhenusinngNAtllter. signal-tortoise
ratlosrmfldbebetterthan- -40rB Average
'valueismeasured.andrandorndeviatlonsnust
notexceed +5cB..

10.Wowandtlutter.epeed:mrewithwowand

fluttermeterandteetrecord (Dennon X6 7004).
Maximum aweptable drift (speed deviation) is
05%. and wow and flutter maximum t 0.15%
(DIN). it more. check the platter bearing, belt
and motor.

oilshouidbeaddedethetonearmilftstoosloMy. Furtherinstructionsforsettingsandmalntenancearepro-
remove some silcon oil from the inner friction vided in the customer's manual (lNSTRUCTlONS FOR
surface of the brake [201. tNSTALLATtON AND OPERATiON).

meme 9 SERVICEMAMJAL

Page 13

PARTS LIST

A. BASIC/PRIMARY/SET B. FULL SET
CALLOUT PART CALLOUT 'RART
NO. DESCRIPTION NO. NO. DESCRIPTION No.
7. SPRING 7AA 791 36 1. CASE BOTTOM PART W 696 019
(599 Chang 2. CHASSIS Assv 8AF 115 027
9. 5qu 6AA 024 000 (Case. adnom Pan)
(3 'm '3 3. HOLDER 6AA 664 001
(EUROPE) 9. SVNCHRONOUS MOTOR SPJ NAD 5120 (ChessIs)
9') 22° V5° 1 4. CM)! 6AA 260 066
(USA) 10 SVNCHRCNDUS VICTOR SPJ NAD 5120 (Speed Change)
0') 20 V5° "1 s. WASHER 7AA 064 36
(EUROPE) 11. PULLEV 50 Hz 6AA 666 006.01 (Speed Change)
(W0 6. SLIDER 6AA 199 006
17. SPRDIG 7AA 796 31 (Speed Change)
(ML 509 We" (USA) 12 PULLEY 60 Hz 6AA 886 006.02
21. SPRING 6AA 766 006 (Motor)
(00""0' SM) 19. SLIDER GUIDE 6AA 261 064
23. TDNEARIII REST ASS)! 8AF 140 006 (Speed Change)
(3) 14. BEARING HOLDER w 261 017
30. m 89A 786 25 (Platter, Tonearm)
(Anfisloaflng) 15. SLIDER w 246 010
61. RETAINING Rm 7AA 024 00 (Am. Stop Lever)
(2 mm 53) 18. WASH-I 6AA 064 012
99. TONEARIII BEARING ASSV MP 626 001 (Am. swp Lover)
(Chews) 16. CONTROL SHAFT ASSV ME 725 002
64. SPRING 69A 791 11 (chassis)
(355 $0990") 19. BUMPER SM 683 026
40. mm SHAFT 6 w 242 000 (AuL SIop)
(WM) 20. BRAKE 6AA 259 006
41. MR 9AA 185 042 (ConIrOl Shaft)
(PW 5W) 2. CAN ASSY 6AA 797 000
42 KNOB ASSV BAF 243 017 (Anfiskaflng)
(WW * 599° Change) 24. FELT WASHER 69A 306 02
49. SPRING 69A 766 16 (Mow-Case)
(W W) 25. LEVER 6AA 165 041
67. DELT 4x0.6x 160. (Am. SIop)
3"") . 42 3" 26. STOPPER 6AA 162 007
60. RUBBER HAT 69A 221 05 (A01. SIop Lever)
WWW") 27. PLASnc WASHER 7AA 064 56
62. TONEARIA ASST, COMPLETE BAN 625 010.01 (M Shop Lever)
W 3'0 0' m9) 29. RING 6AA 017 021
64. DUST COVER 69A 696 05 (Aut. Slop Lever)
67. MOONNECTORASSY 2WI<16010 29. LEVER 6AA165040
n COUNTERWEICHT ASSV ME 942 006 (WWW)
(Dynamic Vibration Absorber) 32. R00 . 6AA 169 009
207. NEON LAMP POWER PG 10019 LD (WWWQ)
(100 V) as. WASHER 6AA 064 011
(Chassis HeIghI Mi.)
36. CUSHION 69A 424 01
(Chassis Spring)
37. TRANSPORT NUT 6AA 065 010
(Chassis/Case Bottom)
38. CONNECTING SHAFT 6AA 252 009
(Control)
39. EXTENSION SHAFT A CM 260 095
(Control)
49. LIFTER TUSE 6AA 906 045
(Control)
44. THREAD ROO- 6AA 010 006
(Arm Litter)
4s. CUSHION (RURRER) 6AA 015 002
(Am Liner)
46. SWITCH HOLDER 6AA 666 016
(Power 614001)
47. SWITCH CONTACT W 466 005
(Power)
49. SW CONTACT W 466 004
(Power)
NAD 5120 13 _ SERVICE MANUAL