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SERVICE MANUAL
CD STEREO SYSTEM
NSX-R30
NSX-R31
NSX-R37
S/M Code No. 09-025-454-5R3
EZ,K
EZ
EZ
BASIC CD MECHANISM : BZG-2 ZD5GNC
BASIC TAPE MECHANISM : ZZM-3 YPR4NC
· If requiring information about the CD mechanisim, see Service Manual of BZG-2,
(S/M Code No. 09-023-353-2N8).
NSX­R30
SPEAKER
SYSTEM
CD
CASSEIVER
SX­NR30
CX­NR30
REMOTE
CONTROLLER
RC­CAS10
NSX­R31
CX­NR31
NSX­R37
CX­NR37
SX­NR37


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­ 2 ­
SPECIFICATIONS .............................................................................................................................................................. 3
PROTECTION OF EYES FROM LASER BEAM DURING SERVICING .............................................................................4
NOTE BEFORE STARTING REPAIR ............................................................................................................................. 5, 6
ELECTRICAL PARTS LIST (CX-NR30/31/37) ............................................................................................................ 7 ~ 19
ELECTRICAL PARTS LIST (ZZM-3 YPR4NC) ................................................................................................................. 20
TRANSISTOR ILLUSTRATION ......................................................................................................................................... 21
WIRING ­ 1 (MAIN) ........................................................................................................................................................... 22
SCHEMATIC DIAGRAM ­ 1 (MAIN 1/2) ........................................................................................................................... 23
SCHEMATIC DIAGRAM ­ 2 (MAIN 2/2) ........................................................................................................................... 24
WIRING ­ 2 (FRONT) ....................................................................................................................................................... 25
SCHEMATIC DIAGRAM ­ 3 (FRONT / DECK) ................................................................................................................. 26
WIRING ­ 3 (PT) ............................................................................................................................................................... 27
SCHEMATIC DIAGRAM ­ 4 (PT) ...................................................................................................................................... 28
WIRING ­ 4 (HP) ............................................................................................................................................................... 29
SCHEMATIC DIAGRAM ­ 5 (HP) .................................................................................................................................... 30
WIRING ­ 5 (DECK) .......................................................................................................................................................... 31
FL (CNF-8 FL-BJ867GNK) GRID ASSIGNMENT / ANODE CONNECTION ..................................................................... 32
IC BLOCK DIAGRAM ........................................................................................................................................................ 33
IC DESCRIPTION ....................................................................................................................................................... 34, 35
ADJUSTMENT <TUNER / DECK / FRONT> ............................................................................................................. 36 ~ 41
CD TEST MODE ............................................................................................................................................................... 42
MECHANICAL EXPLODED VIEW ................................................................................................................................... 43
MECHANICAL PARTS LIST ............................................................................................................................................. 44
COLOR NAME TABLE ...................................................................................................................................................... 45
TAPE MECHANISM EXPLODED VIEW .......................................................................................................................... 46
TAPE MECHANISM PARTS LIST ............................................................................................................................... 47, 48
GENERAL SPEAKER DISASSEMBLY INSTRUCTIONS (FOR REFERENCE) .............................................................. 49
SPEAKER PARTS LIST .................................................................................................................................................... 50
ACCESSORIES / PACKAGE LIST .................................................................................................................................... 51
OTHER PARTS LIST (CX-NR30/31/37) ............................................................................................................................ 52
OTHER PARTS LIST (SX-NR30/37) ................................................................................................................................. 53
OTHER PARTS LIST (ZZM-3 YPR4NC) ........................................................................................................................... 54
TABLE OF CONTENTS


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­ 3 ­
SPECIFICATIONS
· Design and specifications are subject to change without notice.
MAIN UNIT CX-NR30/31/37
TUNER
FM tuning range
87.5 MHz to 108 MHz
FM usable sensitivity (IHF)
16.8 dBf
FM antenna terminal
75 ohms (unbalanced)
MW tuning range
531 kHz to 1602 kHz (9 kHz step)
530 kHz to 1710 kHz (10 kHz step)
MW usable sensitivity
350
µV/m
LW tuning range
144 kHz to 290 kHz
LW usable sensitivity
1400
µV/m
MW/LW antenna
Loop antenna
AMPLIFIER
Power output
Rated: 32 W + 32 W
(6 ohms, T.H.D. 1%, 1 kHz/DIN 45500)
Reference: 40 W + 40 W
(6 ohms, T.H.D. 10%, 1 kHz/DIN 45324)
10 %, 6 ohms)
30EZ,31EZ,37EZ:
DIN MUSIC POWER: 100 W + 100 W
Total harmonics distortion
0.08 % (16 W, 1 kHz, 6 ohms, DIN
AUDIO)
Input
VIDEO/AUX: 500 mV
Outputs
SPEAKERS: 6 ohms or more
PHONES: 32 ohms or more
CASSETTE DECK
Track format
4 tracks, 2 channels stereo
Frequency response
50 Hz - 15 kHz
Recording system
AC bias
Heads
DECK 1: playback x 1
DECK 2: recording/playback x 1,
erase x 1
CD PLAYER
Laser
Semiconductor laser (
l = 780 nm)
D/A converter
1 bit dual
Signal-to-noise ratio
85 dB (1 kHz, 0 dB)
Harmonic distortion
0.05 % (1 kHz, 0 dB)
GENERAL
Power requirements
230 V AC, 50 Hz
Power consumption
75 W
Power consumption
With ECO mode on: 0.6 W
in standby mode
With ECO mode off: 17 W
Dimensions (W x H x D)
260 x 324 x 315 mm
Weight
6.0 kg
FRONT SPEAKER SX-R30/R37
Speaker system
3 way, bass reflex (magnetic shielded)
Speaker units
Woofer: 160 mm cone
Tweeter: 60 mm cone
Super tweeter: 20 mm ceramic x 2
Impedance
6 ohms
Dimensions (W x H x D)
230 x 324 x 227 mm
Weight
3.5 kg


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­ 4 ­
CLASS 1
LASER PRODUCT
KLASSE 1
LASER PRODUKT
LUOKAN 1
LASER LAITE
KLASS 1
LASER APPARAT
This set employs laser. Therefore, be sure to follow carefully
the instructions below when servicing.
WARNING!!
WHEN SERVICING, DO NOT APPROACH THE LASER
EXIT WITH THE EYE TOO CLOSELY. IN CASE IT IS
NECESSARY TO CONFIRM LASER BEAM EMISSION.
BE SURE TO OBSERVE FROM A DISTANCE OF MORE
THAN 30cm FROM THE SURFACE OF THE OBJECTIVE
LENS ON THE OPTICAL PICK-UP BLOCK.
s
Caution: Invisible laser radiation when
open and interlocks defeated avoid
exposure to beam.
s
Advarsel: Usynlig laserståling ved åbning,
når sikkerhedsafbrydere er ude af funktion.
Undgå udsættelse for stråling.
VAROITUS!
Laiteen Käyttäminen muulla kuin tässä käyttöohjeessa
mainitulla
tavalla
saataa
altistaa
käyt-täjän
turvallisuusluokan 1 ylittävälle näkymättömälle
lasersäteilylle.
VARNING!
Om apparaten används på annat sätt än vad som
specificeras i denna bruksanvising, kan användaren
utsättas för osynling laserstrålning, som överskrider
gränsen för laserklass 1.
PROTECTION OF EYES FROM LASER BEAM DURING SERVICING
CAUTION
Use of controls or adjustments or performance of proce-
dures other than those specified herin may result in
hazardous radiation exposure.
ATTENTION
L'utillisation de commandes, réglages ou procédures
autres que ceux spécifiés peut entraîner une dangereuse
exposition aux radiations.
ADVARSEL
Usynlig laserståling ved åbning, når sikkerhedsafbrydereer
ude af funktion. Undgå udsættelse for stråling.
This Compact Disc player is classified as a CLASS 1
LASER product.
The CLASS 1 LASER PRODUCT label is located on the
rear exterior.
Precaution to replace Optical block
(KSM213RSCM)
1) After the connection, remove solder shown in
the right figure.
Body or clothes electrostatic potential could ruin
laser diode in the optical block. Be sure ground
body and workbench, and use care the clothes
do not touch the diode.
SOLDER


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­ 5 ­
NOTE ON BEFORE STARTING REPAIR
Charging voltage (V)
Discharging
Rated power (W)
Parts number
(C101, 102)
resistor (
)
25-48
100
3
87-A00-247-090
49-140
220
5
87-A00-232-090
Note: The reference numbers (C101, C102) of the electrolytic capacitors can change depending on the models. Be sure to check the
reference numbers of the charging capacitors on schematic diagram before starting the discharging work.
2. Check items before exchanging the MICROCOMPUTER
Be sure to check the following items before exchanging the MICROCOMPUTER. Exchange the MICROCOMPUTER after confirming
that the MICROCOMPUTER is surely defective.
2-1. Regarding the HOLD terminal of the MICROCOMPUTER
When the HOLD terminal (INPUT) of the MICROCOMPUTER is "H", the MICROCOMPUTER is judged to be operating correctly.
When this terminal is "L", the main power cannot be turned on. Therefore, be sure to check the terminal voltage of the HOLD
terminal before exchange.
When the MICROCOMPUTER is not defective, the HOLD terminal can also go "L" when the POWER AMPLIFIER has any
abnormalities that triggers the abnormality detection circuit on the MAIN C. B. that sets the HOLD terminal to "L".
· Good or no good judgement of the MICROCOMPUTER
1
1
1
1
1 Turn on the AC main power.
2
2
2
2
2 Confirm that the main power is turned on and the HOLD terminal of the MICROCOMPUTER keeps the "H" level or not.
3
3
3
3
3 When the HOLD terminal is "L" level, the abnormality detection circuit is judged to be working correctly and the
MICROCOMPUTER is judged to be good.
1. Forced discharge of electrolytic capacitor of power supply block
When repair is going to be attempted in the set that uses relay circuit in the power supply block, electric potential is kept charged across
the electrolytic capacitors (C101, 102) even though AC power cord is removed. If repair is attempted in this condition, secondary defect
can occur.
In order to prevent the secondary trouble, perform the following measures before starting repair work.
Discharge procedure
1
1
1
1
1 Remove the AC power cord.
2
2
2
2
2 Connect a discharging resistor at an end of lead wire that
has clips at both ends. Connect the other end of the lead
wire to metal chassis.
3
3
3
3
3 Contact the other end of the discharging resistor to the
positive (+) side (+VH) of C101. (For two seconds)
4
4
4
4
4 Contact the same end of the discharging resistor as step
3
3
3
3
3 to the negative (-) side (-VH) of C102 in the same way.
(For two seconds)
5
5
5
5
5 Check that voltage across C101 and C102 has decreased
to 1 V or less using a multimeter or an oscilloscope.
Select a discharging resistor referring to the following table.
Fig-1
MAIN C.B
D101
C101
C102
22
3
4