NAD SERVICE MANUAL
Contents
1. IDENTIFICATION SERVICE MANUAL 12 A BASIC PRIMARY SET B FULL SET CALLOUT PART CALLOUT PART NO DESCRIPTION NO NO DESCRIPTION NO 7 SPRING 7AA 791 38 1 CASE BOTTOM PART 8AF 693 019 Speed Chung 2 CHASSIS ASSY BAF 115 027 8 E RING 8AA 024 000 Case Bottom Part 4 Gm da 3 HOLDER BAA 664 001 EUROPE 9 SYNCHRONOUS MOTOR SPJNAD 5120 Chassis 220 VISO Hz 4 CAM BAA 260 036 USA 16 SYNCHRONOUS MOTOR SPJ NAD 5120 Speed Change 120 VO He 5 WASHER TAA 064 38 EUROPE 11 PULLEY 50 Hz BAA 886 006 01 Speed Change Motor 6 SUDER BAA 189 006 17 SPRING TAA 786 31 Speed Change Aut Stop Lever 12 PULLEY 60 Hz BAA 886 006 02 21 SPRING BAA 786 008 Motor Control Shaft 13 SLIDER GUIDE BAA 261 034 25 TONEARM REST ASSY BAF 140 006 Speed Change Chassis 14 BEARING HOLDER BAF 261 017 30 SPRING 89A 786 25 Plater Tonearm 15 SUDER BAF 248 010 31 RETAINING RING 7AA 024 00 Aut Stop Lever 2 mm dia 16 WASHER BAA 064 012 33 TONEARM BEARING ASSY 8AF 826 001 Aut Stop Lever Chassis 18 CONTROL SHAFT ASSY BAF 725 002 34 SPRING 89A 79111 Chassis Chassis Support 18 BUMPER BAA 683 026 40 EXTENSION SHAFT 8 BAF 242 000 Aut Stop Control 20 BRAKE BAA 259 006 41 SLIDER BAA 185 042 Control Shaft ower Satoh 22 CAM ASSY BAA 797 000 42 KNOB ASSY BAF 243017 Antiskating Control Speed Change 24 FELT WASHER 89A 303 02 49 SPRING 82. 55 mm dia 55x2 107 WASHER Case Bottom 180 3 2 53 CONTACT WASHER BAA 063071 108 BRING Bottom Plater 15032 54 SPRING 8AA 786 007 109 E RING Chassis 150 4 0 USA _ 55 ACCORD BAF 615 002 110 NUT Power Model 02 1803 55 ACCORD BAF 635 09 01 111 MACHINE SCREW Power Model 03 1802x5 55 ACCORD 02297 1522 SCREWDRIVER 8 AF 940 000 A Prowery Modeh 4 FINGER LIFT 8 AA 654 011 SIGNAL CORD 7AK 76209 oye DWA FREQUENCY SCREW 8 AA 074 001 02 55 SIGNAL CORD 89F 635 10 01 Pesio DYA FREQUENCY SCREW 8 AA 074 00109 58 BOTTOM PLATTER ASSY BAF 418 003 un 2 BOO Turntable 59 TOP PLATTER BAA 776 007 81889 61 ADAPTOR 45 RPM BAA 250 007 07809 63 HINGE BAF 452 00301 MM 6 00 SPARE PARTS ELECTRICAL 65 HINGE BAF 452 003 02 onian m EA NO DESCRIPTION NO 63 HINGE BAF 45200303 USE ONLY SPECIFIED PARTS Dust Cover Fed Mark 291 RESISTOR 0 39 MO 0 125W 65 CASE TOP PLINTH BAF 699 018 Model 01 03 04 66 PIVOT SCREW 894071 01 202 RESISTOR 0 12 M0 0 125W Tonearm Bearing Model 02 USA Ti TONEARM PC BOARD SAF 11900101 USA 203 CAPACITOR GPF RS415 3900 pF1400 With Slots for Cartridge Model 01 02 03 VAC 72 SETTING WHEEL BAA 248 014 204 CAPACITOR TC 210 2200 pF 1000 V VIF Vertical Tracking Force Model 04 101 MACHINE SCREW 205 CAPACITOR TGL 200 8424 022 uF 260V 150 4x8 Model 01 03 04 102 MACHINE SCREW USA 206 CAPACITOR TGL 200 8424 0 68 60 180310 Model 02 103 MACHINE
3. Effective mass 6 grams Overhang 19 1 mm inch Offset angle 26 Lateral tracking error Zero R 63 6 and 119 1 mm Maximum tracking error 0 16 cm 0 4 inch Dynamic Vibration Spring suspended counter Absorber weight with viscous damping Cartridge weight 4 to B grams with counter in normal position 2 to 4 grams with counter weight assembly reversed Vertical tracking force 0 to 3 grams 0 to 30 miliNewtons Antiskating range 0 75 to 3 grams 75 to 30 mN Cable capacitance 150 pF DIMENSIONS Width 42 cm 16 in Height 10 5 cm 4 in Depth including knob 35 4 cm 14 in and cover hinges Net weight 5 kg 11 b Shipping weight 6 5 kg 14 lb 5 oz NAD 5120 NOTE All numbers in brackets refer to parts positions called out on diagrams and to the complete Parts List included in this manual 1 00 EQUIPMENT DISASSEMBLY 1 Disconnect power cord 2 Pul the dust cover 64 upwards out of the hinges 3 Pull the tonearm out of the connector 4 Remove the 3 screws 105 fastening the case top 65 that are accessible after lifting off the adapter 61 the rubber mat 60 and the top platter 59 5 Lean both thumbs on the bottom case 1 and by pulling the case top with the other fingers release it gradually 6 Remove retaining ring 109 from the transport screw Unscrew the transport nut 7 Using tweezers release the spring 54 out of the suspension on the chassis 2 8 Take off the belt 57
4. from the bottom platter 9 Pull out the bottom platter 58 from the bearing 14 10 Unsolder five fine flexible wires from the instead of to 11 Take off the connecting shaft 38 after pushing the chassis slightly backwards 12 1 ut of ho uber IT DA weh fastened on the bottom case 1 When assembling the equipment reverse the above procedure AURE 5 DISASSEMBLY OF CASE TOP PLINTH 6 SERVICE MANUAL FIGURE 5 INTERNAL PARTS AND FEATURES f Y 1 E4 Z IN 1 V J zj 2 00 OPERATIONS ON THE CHASSIS 1 Removing the tonearm bearing assembly Re lease the screw 103 in the cutout of the bottom part and pull the bearing assembly out of the bearing Slide the rod 32 out of the suspension 2 Removing the connector Loosen one of the Pivot screws 68 to set the connector 67 free Check if the flexible wires soldered to the pins are not broken or disconnected The wires are fixed between terminals by a rubber insert 3 How to re install connector a to assist in holding the socket 67 insert a spare 4 pin male DIN plug b put the connector 67 into the bearing assembly 33 so that the triangle mark faces the tonearm rest 23 hold the connector centered and lean it by one tip to the pit of the pivot screw 68 d tighten the second screw 68 until just sn
5. SCREW 207 NEON LAMP PG 100 1910 1803x14 wov NAD 5120 15 SERVICE MANUAL NAD ELECTRONICS BOSTON LONDON
6. of the lifter so that the stylus tip is 5 to 7 mm above the record sur face when the arm is in the raised position 2 Switching off Switching off mechanism should not require any adjustment Only the starting posi tion of rotating switching off lever 25 should be checked as follows Move the tonearm 62 towards the record center When the distance between the stylus and the spindle is approximately 152 mm 6 just before rim of LP record visible rotation of switching off lever 25 pulled by rod 32 must be observed When the stylus is 63 mm 2 away from the record center the distance between the stopper tip 26 on switching off lever and the platter axis should be exactly 19 mm 3 To ensure proper function of the switching off lever the stopper 26 movement must be absolutely free 3 Antiskating side force compensation The antiskating is set during production so that its side force is approximately 10 of vertical tracking force VTF if the same data are set on the anti skating 22 and VTF 72 dials The antiskating force should be almost constant when moving the tonearm across the record grooves field The starts to operate at the rim of 30 cm 127 diameter record only When the arm is posi tioned between record and arm rest the antiskat ing is out of function and the VTF can be set in this place easily without any side component 4 Speed change Chassis 1 is to be fixed by trans port n
7. 9A 786 16 Molor Case Power 25 LEVER BAA 185 041 57 BELT 4x0 8x 160 Aut Stop Drive Em 26 STOPPER BAA 182 007 60 RUBBER MAT 89A 221 05 Aut Stop Lover 27 PLASTIC WASHER TAA 064 58 62 TONEARM ASSY COMPLETE SAN 625 010 01 Aut Stop Lever With Slots for Cartridge 28 RING BAA 017 021 64 DUST COVER 89A 698 05 Aut Stop Lever 67 TONEARM CONNECTOR ASSY 2WK 180 10 29 LEVER BAR 185 040 75 COUNTERWEIGHT ASSY BAF 942 006 Antiskating Dynamic Vibration Absorber 32 ROD BAA 188 009 207 NEON LAMP POWER PG 100 19 LD Antiskating 100 V 35 WASHER BAA 064 011 Chassis Height Adj 36 CUSHION 89A 424 01 Chassis Spring 37 TRANSPORT NUT BAA 035 010 Chassis Case Bottom 28 CONNECTING SHAFT BAA 252 009 Contro 39 EXTENSION SHAFT A 260 035 Contro 43 LIFTER TUBE BAA 906 045 Control 44 THREAD ROD 010 008 Arm Lifter 45 CUSHION RUBBER 015 002 Arm Litter 46 SWITCH HOLDER BAA 668 018 Power Switch 40 SWITCH CONTACT 8AF 468 005 Power 48 SWITCH CONTACT BAF 468 004 Power 13 SERVICE MANUAL NAD 5120 FIGURE 2 BACK VIEW SERVICE MANUAL NAD 5120 B FULL SET CALLOUT PART CALLOUT NO DESCRIPTION NO NO DESCRIPTION 50 BRACKET 8AA 185 035 104 SCREW TAPPING Power Switch 3x18 81 LUG TERMINAL 7AA 06006 105 SCREW TAPPING Power 35x18 SIA DIN SOCKET 5 PIN 106 WASHER 52 RUBBER BUSHING CSN 633881 1 15043
8. SERVICE MANUAL 5120 912 TURNTABLE 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 Disassembly of case top plinth Figure 6 Intemal parts and features Figure 7 Electrical diagram Figure 8 Pickup cartridge wiring diagram Figure 9 Exploded view parts identification MECHANICAL AND ELECTRICAL PARTS LIST PAGE SERVICE MANUAL FIGURE 1 FRONT VIEW Dust cover Center hole adapter SERVICE MANUAL 3 FIGURE 3 TONEARM FIGURE 4 TONEARM FEATURES SERVICE MANUAL NAD 5120 SPECIFICATIONS NAD 5120 SEMI AUTOMATIC BELT DRIVE TURNTABLE TURNTABLE Drive system Precision neoprene beit drive Motor motor 360 rpm with 60 Hz power 300 rpm at 50 Hz Speeds 38 3 and 45 1 mm Speed accuracy 205 Wow and flutter 0 07 DIN peak 0 04 WRMS Signal to noise ratio gt 70 dB DIN B weighted rumble 43 dB DIN A unweighted Suspension system Platter and tonearm mounted on bra 7 floating on high compliance springs Suspension resonance Below 4 Hz TONEARM Features Fiat flexible interchangeable balanced tonearm with Dynamic Vibration Absorber Operation Semi automatic automatic it and stop at end of record Length 27 8 cm 10 in total length 20 8 cm 8 in pivot to stylus
9. ne having viscosity 180 000 CP e g Wacker AK 18000 The oil should be refilled through the damping chamber aperture after unscrewing the damping rod by using a common syringe If a cartridge has been installed tum the tracking force wheel to balance the arm and then set the vertical tracking force If the white DVA tuning screw obstructs the motion of the counterweight substitute a shorter screw If the cartridge weighs less than 4 grams and cannot be balanced rotate the counterweight assembly 180 degrees Tum in the DVA tuning screw press down hard on the force wheel in order to flatten the spring washer beneath it and rotate the assembly Adjust the Dynamic Vibration Absorber DVA as described in the DVA Tuning leaflet or use nominal settings of 10 Hz for the tuning frequency and 2 for the damping ratio In each case align the top of the adjusting screw with the desired scale setting Check the geometric alignment of the cartridge with respect to rotation and overhang see cus tomer instruction manual Use an alignment pro tractor to check the offset angle of the cartridge Check the connection of the wires at the back of the cartridge for a snug friction fit crimp to tighten if necessary and correct connection according to the standard colour code A Checking the postion of the fiosting chassis suspension in position when transport nut and piatter are released and the record and tonearm are put
10. on the vertical clearance be tween the lower surface of the rubber mat 60 and the case top 65 around the whole rim must between chassis parts and the case top 65 should be also 3 mm Vertical clearance can be Increased o reduced by inserting or removing washers 35 between rubber cushions 36 and chassis holder or by bending the holder ends slightly 9 Signal to nolse ratio Measure with the test rec ord Dennon XG 7004 according to DIN 45 544 Standard When using DIN A filter signal to noise ratio should be better than 40 dB Average value is measured and random deviations must not exceed 5 0B 10 Wow and flutter speed Measure with wow and flutter meter and test record Denon XG 7004 Maximum acceptable drift speed deviation is 0 5 and wow and flutter maximum 0 15 DIN If more check the platter bearing belt and motor oll should be added the tonearm lifts too slowly Further instructions for settings and maintenance are pro remove some silicon oil from the inner friction vided in the customer s manual INSTRUCTIONS FOR surface of the brake 20 INSTALLATION AND OPERATION NAD 5120 SERVICE MANUAL FIGURE 7 ELECTRICAL DIAGRAM 9 10 207 47 48 SYNCHRONOUS MOTOR NEON LAMP POWER SWITCH MAINS FIGURE 8 PICKUP CARTRIDGE WIRING DIAGRAM CARTRIDGE TONEARM CONNECTOR AUDIO SIGNAL LEAD RCA_JACKS ts O NAD 5120 10 SERVICE MANUAL FIGURE 9 EXPLODED VIEW PA
11. ug e loosen either screw 68 approximately 90 1 secure both screws 68 with nail polish lacquer 9 if the connector 67 is not centered adjust its position by both pivot screws 68 When prop erly adjusted the connector should move freely back and forth in the bearing but with as little lateral motion as possible The flexible connec tor wires must be secured between the termi nais by a rubber insert and faced towards the bottom opening where they should pass through freely The wires must not interfere with arm holder rotation or movement of the connector 4 Lubrication of the bearings The platter and tonearm bearings are selt lubricated so they should not require any regula maintenance both platter and tonearm beari can be lubricated witha sma 9 machine oil 8 SERVICE MANUAL 3 00 FUNCTION CHECKING 1 Tonearm lifter 43 and 44 The stylus should drop on the record grooves from the lifted position within 1 50 7 seconds If it drops faster add more silicon oil to the inside surface of the lifter fit drops slower remove some of the oil After any operation on lifter move it slightly up and down and tum it several times in order to distrib ute silicon oil uniformly and to ensure perfect lifter operation The height of the tonearm lifter is adjustable to compensate for different cartridge body heights If a cartridge has been installed in the arm tum the threaded shaft in the top
12. ut 37 top platter is removed Check whether the belt slips easily from one pulley stage to the her ow tung or permaneriy touching the slider 5 Pulley position The distance between the lower surface of the top pulley stage 11 or 12 and lower vertical part of the slider 6 should be 0 2 0 3 mm set it with steel plate 0 25 mm thick inserted between those parts If the belt rubs speed change slider adjust height of pulley 12 on motor shaft 6 Control start stop knob 42 When the tumtabie is off the knob must be vertical When playing the mark line faces to the right horizontally After turning it back about 15 the knob retums slowly to off position being pulled by spring 21 The tum table is then switched off and the tonearm lifted The knob retum time to the off position should take approximately 1 second If less some silicon 7 Tonearm check if the tonearm will be turned upside down for more than a few minutes unscrew the DVA damping rod 18 the small threaded rod located in the center of the track ing force wheel until it protrudes at least 2 mm 4 above the wheel in order to seal the oil chamber and prevent leakage Check the viscous oil amount in the damping chamber 20 The level should be between the marks 0 and 1 on the damping scale 0 which to 6mm height of the damping 01 In case the oil has leaked out it should be refilled with NAD oil Part No 8 88600 or with a univer sal o
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