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SERVICE MANUAL
DA
TA
COMPACT DISC STEREO SYSTEM
BASIC TAPE MECHANISM : ZZM-3
BASIC CD MECHANISM : AZG-1
U
LH
LH, HS
LH
HA
HA
S/M Code No. 09-005-426-1R1
REVISION
· This Service Manual is the "Revision Publishing" and replaces "Simple Manual".
NSX-AJ24 <U> / BL24 <LH>
(S/M Code No. 09-003-426-1T1)
NSX-BL23 <LH> / BL34 <LH>
(S/M Code No. 09-004-426-1T4)
NSX-BL24 <HS>
(S/M Code No. 09-004-426-1T5)
· If requiring information about the CD mechanism, see Service Manual of AZG-1.
AZG-1 ZD8RDC
(S/M Code No. 09-001-335-3NA)
AZG-1 YZD8RDM
(S/M Code No. 09-001-335-3N6)
AZG-1 ZD4RDC
(S/M Code No. 09-001-335-3N8)
NSX-AJ24
NSX-BL23
NSX-BL24
NSX-BL34
NSX-BL24E
NSX-BL34E


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­ 2 ­
SYSTEM COMBINATION TABLE
NSX­AJ24
RC­ZAS02
SYSTEM
CD
CASSEIVER
REMOTE
CONTROLLER
SPEAKER
SX­NAJ25
SX­R140
NSX­BL23
NSX­BL24
NSX­BL34
NSX­BL24E
NSX­BL34E
TAPE
MECHANISM
CD
MECHANISM
CX­NAJ24
CX­NBL23
CX­NBL24
CX­NBL34
CX­NBL24E
CX­NBL34E
SX­NBL25
SX­NBL42
SX­NBL25
SX­NBL42
ZZM­3 YPR1NC
ZZM­3 YPR1NC
ZZM­3 YPR1NM
AZG­1 ZD8RDC
AZG­1 ZD8RDC
AZG­1 YZD8RDM
AZG­1 ZD4RDC


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­ 3 ­
<General>
Power requirements
U:
120 V AC, 60 Hz
HS:
220 V AC, 60 Hz
LH, HA: 120 V/220 ­ 230 V/240 V AC
Switchable, 50/60 Hz
CX-NAJ24 <U>:
Power consumption
75 W
Power consumption
13 W with power-economizing mode off
in standby mode
0.9 W with power-economizing mode on
Dimensions (W x H x D)
260 x 328 x 329 mm
(101/
4 x 13 x 13 in.)
Weight
6.4 kg (14 lbs 2 oz.)
CX-NBL23/CX-NBL24 <LH>, CX-NBL24E <HA>:
Power consumption
80 W
Power consumption
13 W with power-economizing mode off
in standby mode
0.9 W with power-economizing mode on
Dimensions (W x H x D)
260 x 328 x 329 mm
Weight
6.3 kg
CX-NBL34 <LH>, CX-NBL34E <HA>:
Power consumption
125 W
Power consumption
17 W with power-economizing mode off
in standby mode
0.9 W with power-economizing mode on
Dimensions (W x H x D)
260 x 328 x 329 mm
Weight
7.1 kg
CX-NBL24 <HS>:
Power consumption
70 W
Power consumption
13 W with power-economizing mode off
in standby mode
0.9 W with power-economizing mode on
Dimensions (W x H x D)
260 x 328 x 329 mm
Weight
6.3 kg
Speaker system SX-NAJ25 <NSX-AJ24>
Speaker system SX-NBL25 <NSX-BL23/BL24/BL24E>
Speaker system SX-NBL42 <NSX-BL34/BL34E>
Speaker system
3 way, bass reflex
(magnetic shield type)
Speaker units
Woofer:
140 mm (55/
8 in.) cone type
Tweeter:
60 mm (23/
8 in.) cone type
Super tweeter:
20 mm (13/
16 in.) ceramic type
Impedance
6 ohms
Sensitivity
87 dB/W/m
Dimensions (W x H x D)
SX-NAJ25/SX-NBL25:
202 x 324 x 219 mm
(8 x 127/
8 x 8
5/
8 in.)
SX-NBL42:
220 x 324 x 230 mm
Weight
SX-NAJ25/SX-NBL25:
3.8 kg (8 lbs 6 oz.)
SX-NBL42:
4.0 kg
SPECIFICATIONS
Main unit
<FM Tuner section>
Tuning range
87.5 MHz to 108 MHz
Usable sensitivity (IHF)
13.2 dBf
Antenna terminals
75 ohms (unbalanced)
<AM Tuner section>
Tuning range
530 kHz to 1710 kHz (10 kHz step)
531 kHz to 1602 kHz (9 kHz step)
Usable sensitivity
350
µV/m
Antenna
Loop antenna
<Amplifier section>
CX-NAJ24 <U>:
Power output
50 W + 50 W (50 Hz ­ 20 kHz,
T.H.D. less than 1 %, 6 ohms)
62 W + 62 W (1 kHz, T.H.D.
less than 10 %, 6 ohms)
Total harmonic distortion 0.08 %
(25 W, 1 kHz, 6 ohms, DIN AUDIO)
CX-NBL23/CX-NBL24 <LH>, CX-NBL24E <HA>:
Power output
Rated: 40 W + 40 W
(6 ohms, T.H.D. 1 %, 1 kHz)
Reference: 50 W + 50 W
(6 ohms, T.H.D. 10 %, 1 kHz).
Total harmonic distortion 0.05 %
(25 W, 1 kHz, 6 ohms, DIN AUDIO)
CX-NBL34 <LH>, CX-NBL34E <HA>:
Power output
Rated: 65 W + 65 W
(6 ohms, T.H.D. 1 %, 1 kHz)
Reference: 80 W + 80 W
(6 ohms, T.H.D. 10 %, 1 kHz).
Total harmonic distortion 0.05 %
(40 W, 1 kHz, 6 ohms, DIN AUDIO)
CX-NBL24 <HS>:
Power output
Rated: 24 W + 24 W
(6 ohms, T.H.D. 1 %, 1 kHz)
Reference: 30 W + 30 W
(6 ohms, T.H.D. 10 %, 1 kHz).
Total harmonic distortion 0.08 %
(15 W, 1 kHz, 6 ohms, DIN AUDIO)
Inputs
VIDEO/AUX: 500 mV
Outputs
SPEAKERS: accepts speakers of
6 ohms or more
SURROUND SPEAKERS <U only> :
accepts speakers of 8 ohms to
16 ohms
PHONES (stereo jack): accepts
headphones of 32 ohms or more
<Cassette deck section>
Track format
4 tracks, 2 channels stereo
Frequency response
50 Hz ­ 15 kHz
Recording system
AC bias
Heads
DECK 1: Playback head x 1
DECK 2: Recording/playback head x 1,
erase head x 1
<Compact disc player section>
Laser
Semiconductor laser (
=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)
· Design and specifications are subject to change without notice.
· The word "BBE"and the "BBE symbol" are trademarks of BBE
Sound, Inc.
Under license from BBE Sound,Inc.


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­ 4 ­
Precaution to replace Optical block
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.
Caution: Invisible laser radiation when
open and interlocks defeated avoid
exposure to beam.
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.
CLASS 1
LASER PRODUCT
KLASSE 1
LASER PRODUKT
LUOKAN 1
LASER LAITE
KLASS 1
LASER APPARAT
(KSS ­ 213F)
(KSM ­ 880CAB)
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.
1) After the connection, remove solder
shown in the right figure.
Solder
(KSS ­ 213F)
PICKUP Assy P.C.B.
solder
(KSM ­ 880CAB)
PICKUP Assy P.C.B.


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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