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NAD C521 Service Manual

Other manuals for C521: Owner's Manual, Owner's Manual, Service Manual
Manual is about: Nad Owner Manual Compact Disc Player C521

Summary of C521

  • Page 1

    Nad schematics c 521 compact disc player c 521 comp act disc pla yer.

  • Page 2: Safety Information

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  • Page 3: Service Safety Precautions

    3 service safety precautions 1. Replacing the fuses caution: for continued protection against the risk of fire replace only with same type of fuse. Reference no part number description m502-m504 *ah 5120-0020-0 fu t1a 250v ul/csa 5x20mm m502-m504 *c 5120-0018-0 fu t1a 250v semko/ude 5x20mm m505 *ah ...

  • Page 4: Specifications

    4 specifications disc capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . One disc, 120 or 80 mm decoding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Burr-brown delta sigma 20bit digital filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 times overs...

  • Page 5: Rear Panel / Front Panel

    5 rear panel / front panel rear panel front panel 1. Line out 2. Digital out 3. Ac line cord 1. Power on / off 2. Disc drawer 3. Display 4. Open 5. Play / pause 6. Time 7. Stop 8. Repeat 9. Random 10. Scan back ( ) / forward ( ) 11. Skip back ( ) / forward ( ).

  • Page 6: Disassembly Instructions

    6 disassembly instructions 1. Remove machine screws m 4.0 x 6.0 ( 1 to 4 ) from the side panels. Remove tapping screw 3.0 x 8.5 5 from the back panel. Refer to figure no.1. Figure no.1 2. Pull both sides of the top cover slightly outwards 6 and tilt approx. 35˚ and then remove in the direction as in...

  • Page 7: Block Diagram

    7 block diagram u401 lc587206a system control cpu & lcd display driver q401- q403 mute circuit q301-q304 mute m317 rca jack u302 pmc1710 m318 rca jack digital output m501* lcd display 3 5 6 19 2 63 23 29 39 62 37 1 2 16 13 3 42 44 43 23 24 14 13 33 34 31 32 21 22 65 67 2 4 3 6 56 l r l r cd audio o/...

  • Page 8: Wiring Diagram

    8 wiring diagram m102 (15 pins) m505b white m505a white m509a black m120 black m500a black m805 brown neutral live m803 brown j402 m105 (6 pins) m101 (5 pins) main board transformer board displa y board live board cd mechanism keyboard 115v:j401,j404 230v:j403 l401 j403 j406 j407 j402 j404 j401 1723...

  • Page 9: Rf Pattern Testing

    9 rf pattern testing nad - c 521 pcb testing points diagram testing procedure (1) load the test disc (sony test cd yeds-7) and set the unit into play mode. (2) connect the scope to r132 (pin 41 of u101) and dgnd (j334). Scope setting: coupling : ac. Vertical sensitivity : 0.2 v/ div. Horizontal time...

  • Page 10: Important Notes

    10 important notes instruction for handling optical system block pick-up electrostatic breakdown of the laser diode in the optical system block may occur due to a poten- tial difference caused by electrostatic charge accumulated on clothing, human body, etc. A ground must be provided as follows to p...

  • Page 11

    11 precautions when changing laser pick-up when removing the pick-up assembly, short circuit the pcb tracks on the optical block as show in the drawing in order to protect the pick-up before removal. Note: replacement pick-up assemblies are supplied with the pcb pattern already protected. Do not rem...

  • Page 12: Pcb Layout

    12 pcb layout transformer board live board key board display board 115v:j401,j404 230v:j403 l401 j403 j406 j407 j402 j404 j401 1723-006a-0000 8v 0v 0v 8v 15v 0v 15v issue b.

  • Page 13

    14 13 main board.

  • Page 14

    15 16 schema tic diagram m502 m501 5v 0v 4.3v 2.2v 5v 0v 0v 0v 0v 0v 2.4v 1.6v 0v 0v 0v 4.9v 0v 0v 4.8v *0v 4.8v *1.2v 4.9v *0v 5v 5v 2.4v 0v 1.1v *2.7v 1.2v *2.7v *7.4v 7.8v 2.5v 2.5v 2.5v 3.4v 3.4v 0v 0v 0v 3.5v 3.5v 2.5v 2.5v 4.8v 4.9v *7.4v 7.8v *5v 0v 2.4v 2.5v *3.3v 3.5v *2.9v 3.5v 0v 0v 0v 3....

  • Page 15: Ic Block Diagram

    64 vcc1 63 lds 62 ldd 61 bh1 60 ph1 59 lf2 58 vr 57 refi 56 vcc2 55 fss 54 drf 53 ce 52 dat 51 cl 50 clk 49 def 48 nc 47 tbc 46 fsc 45 dgnd 44 sli 43 slc 42 rfs– 41 rfsm 40 cv+ 39 cv– 38 slof 37 hfl 36 tes 35 toff 34 tgl 33 jp+ 32 jp– 31 sl+ 30 sl– 29 sld 28 sleq 27 spd 26 sp– 25 spg 24 spi 23 sp 22...

  • Page 16

    18 u302: pcm1710u input interface timing control digital filter mode control noise shaper 5-level dac left low pass filter left cmos amp left 5-level dac right low pass filter right cmos amp right 1 2 3 4 6 8 10 12 5 7 9 11 13 14 lrcin din bckin clko xti xto dgnd vdd vcc2r agnd2r ext1r ext2r voutr a...

  • Page 17

    1 vcc 2 mute 3 v in1 4 vg 1 5 vo1 6 vo2 7 gnd 8 gnd 9 gnd 10 vo3 11 vo4 12 vg2 13 v in2 14 reg out 15 reg in 30 vcc 29 v ref 28 v in4 27 vg 4 26 vo8 25 vo7 24 gnd 23 gnd 22 gnd 21 vo6 20 vo5 19 vg3 18 v in3 17 cd 16 res level shift 4 level shift 1 btl amp 4 btl amp 1 11k 11k 11k 11k vcc btl amp 3 bt...

  • Page 18

    20 seg13 seg12 seg11 seg10 seg09 seg08 seg07 seg06 seg05 seg04 seg03 seg02 tst seg01 m4 m3 res int s01 s02 s03 s04 p1 p2 p3 p4 xtout xtin vdd1 vdd2 vss vdd n2 n1 m4 m3 m2 m1 k4 k3 k2 k1 s4 s3 s2 s1 cfout cfin seg14 seg15 seg16 seg17 seg18 seg19 seg20 seg21 seg22 seg23 com4 com3 com2 com1 cup1 cup2 4...

  • Page 19: Troubleshooting Guide

    21 troubleshooting guide set power switch to on. Is power turned on ? M502, m503, m504, m505 defective crystal m401 defective. Microprocessor ic u401 defective. Motor drive ic u701 defective. Can tray be opened ? Can tray be closed ? Does initial reading occur ? Can disc be played ? Check tracking s...

  • Page 20: Mechanism Exploded View

    27 mechanism exploded view cd11ca.

  • Page 21: Exploded View

    29 exploded view ! ! ! 0202 0202 t1 0101 0014 0202 0003 u507 0211 u501 0005 0012 0224 0223 0020 0218 0002 0209 0201 0228 u503 m317 0226 u506 0205 0205 0013 0304 0208 0018 0202 0219 0225 0320 0008 0010 0226 0205 0001 0006 0021 0022 0023 0205 0019 0202 0007 0227.

  • Page 22: Packing Diagram

    31 packing diagram item part no. Description q’ty 36 1490-3783-0 polyfoam endcap 2 37 1497-1332-1 unit polybag 1 38 1497-1432-0 fascia cover 1 39 4060-0530-0 batteries 2 40 2103-7302-1 rca cable 1 41 8900-2166-0 remote control handset 1 42 1497-1302-1 remote control polybag 1 43 4301-4104-1 instruct...