NSX-DP25 NSX-HMT25
LH
U
SERVICE MANUAL
COMPACT DISC |
BASIC TAPE MECHANISM : ZZM-3 PR1NM |
STEREO SYSTEM |
BASIC CD MECHANISM : AZG-1 ZD8RDM |
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SYSTEM |
CD |
SPEAKER |
REMOTE |
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CASSEIVER |
CONTROLLER |
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NSX-DP25 |
CX-NDP25 |
SX-NSZ52 |
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SX-R277 |
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SX-C607 |
RC-ZAS10 |
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SX-NAJ22 |
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NSX-HMT25 |
CX-NHMT25 |
SX-R275 |
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SX-C605 |
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• This Service Manual is the “Revision Publishing” and replaces “Simple Manual” CX-NHMT25 (U), (S/M Code No. 09-002-428-0T1) and CX-NDP25 (LH),
(S/M Code No. 09-003-428-0T2).
•If requiring information about the CD mechanism, see Service Manual of AZG-1, (S/M Code No. 09-001-335-3N6).
S/M Code No. 09-004-428-0R1
REVISIONDATA
SPECIFICATIONS
<FM tuner section> |
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Tuning range |
87.5 MHz to 108 MHz |
Usable sensitivity (IHF) |
13.2 dBf |
Antenna terminals |
75 ohms (unbalanced) |
<AM tuner section> |
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Tuning range |
530 kHz to 1710 kHz (10 kHz step) |
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531 kHz to 1602 kHz (9 kHz step) |
Usable sensitivity |
350 V/m |
Antenna |
Loop antenna |
<Amplifier section> |
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Power output |
Front |
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LH: |
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Rated: 50 W + 50 W (6 ohms, THD 1%, |
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1 kHz) |
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Reference: 60 W + 60 W (6 ohms, |
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THD 10%,1 kHz) |
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U: |
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50 W + 50 W (50 Hz – 20 kHz, |
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THD less than 1%, 6 ohms) |
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Rear (Surround) |
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LH: |
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Rated: 20 W + 20 W (8 ohms, THD 1%, |
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1 kHz) |
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Reference: 25 W + 25 W (8 ohms, |
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THD 10%, 1 kHz) |
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U: |
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20 W + 20 W (1 kHz, THD less than 1%, |
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8 ohms) |
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Center |
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LH: |
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Rated: 20 W (8 ohms, THD 1%, 1 kHz) |
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Reference: 25 W (8 ohms, THD 10%, |
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1 kHz) |
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U: |
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20 W (1 kHz, THD less than 1%, |
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8 ohms) |
Total harmonic distortion |
LH: 0.1% (30 W, 1 kHz, 6 ohms, |
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DIN AUDIO/Front) |
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U: 0.1% (25 W, 1 kHz, 6 ohms, |
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DIN AUDIO/Front) |
Inputs |
VIDEO/AUX : 300 mV (adjustable) |
Outputs |
SPEAKERS : accept speakers of 6 |
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ohms or more |
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SURROUND SPEAKERS : accept |
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speakers of 8 ohms to 16 ohms |
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CENTER SPEAKER : accept speakers |
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of 8 ohms or more |
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SUBWOOFER : 1.6 V |
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PHONES (stereo jack) : accepts |
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headphones of 32 ohms or more |
<Cassette deck section> |
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Track format |
4 tracks, 2 channels stereo |
Frequency response |
50 Hz – 15 kHz |
Recording system |
AC bias |
Heads |
Deck 1 : Playback head x 1 |
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Deck 2 : Recording/Playback head x 1, |
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erase head x 1 |
<Compact disc player section> |
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Laser |
Semiconductor laser (λ |
=780 nm) |
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D-A converter |
1 bit dual |
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Signal-to-noise ratio |
85 dB (1 kHz, 0 dB) |
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Harmonic distortion |
0.05 % (1 kHz, 0 dB) |
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<Speaker system SX–NSZ52, SX–NAJ22> |
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Speaker system |
3 way, bass reflex (magnetic |
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shielded type) |
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Speaker units |
Woofer: 140 mm (5 5/ |
in.) cone type |
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Tweeter: (2 3/ |
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8 |
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in.) 60mm cone type |
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8 |
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Super tweeter: 20 mm (13/ in.) |
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ceramic type |
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16 |
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Impedance |
6 ohms |
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Output sound pressure level |
87 dB/W/m |
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Dimensions (W x H x D) |
SX-NSZ52: 240 x 324 x 270 mm |
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SX-NAJ22: 240 x 324 x 256 mm |
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(9 |
1/ |
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x 12 |
7/ x 10 1/ |
in.) |
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Weight |
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8 |
8 |
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SX-NSZ52: 4.0 kg |
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SX-NAJ22: 3.8 kg (8 lbs 6 oz.) |
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<General> |
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Power requirements |
U: 120 V AC, 60 Hz |
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LH: 120 V/220 - 230 V/240 V AC |
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switchable, 50/60 Hz |
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Power consumption |
U: 110 W |
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LH: 125 W |
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Power consumption in standby mode |
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with power-economizing mode off |
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LH: 19 W |
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U: 20 W |
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with power-economizing mode on |
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0.9 W |
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Dimensions of main unit |
260 x 328 x 357.5 mm |
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(W x H x D) |
(10 1/ x 13 x 14 1/ |
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in.) |
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Weight of main unit |
4 |
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8.7 kg (19 lbs 3 oz.) |
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•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.
•Dolby noise reduction manufactured under license from Dolby Laboratories Licensing Corporation.
“DOLBY” and the double-D symbol
are trademarks of Dolby Laboratories Licensing Corporation.
– 2 –
PROTECTION OF EYES FROM LASER BEAM DURING SERVICING
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.
sCaution: Invisible laser radiation when open and interlocks defeated avoid
exposure to beam.
sAdvarsel: 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.
CAUTION
Use of controls or adjustments or performance of procedures 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
Precaution to replace Optical block
(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.
PICK-UP Assy P.C.B
solder
– 3 –
NOTE ON BEFORE STARTING REPAIR
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 |
MAIN C.B |
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1 |
Remove the AC power cord. |
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2 |
Connect a discharging resistor at an end of lead wire that |
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D101 |
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has clips at both ends. Connect the other end of the lead |
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wire to metal chassis. |
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3 |
Contact the other end of the discharging resistor to the |
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C101 |
C102 |
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positive (+) side (+VH) of C101. (For two seconds) |
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Contact the same end of the discharging resistor as step |
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3to the negative (-) side (-VH) of C102 in the same way. |
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(For two seconds) |
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Check that voltage across C101 and C102 has decreased |
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2 |
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to 1 V or less using a multimeter or an oscilloscope. |
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Select a discharging resistor referring to the following table. |
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Fig-1 |
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Charging voltage (V) |
Discharging |
Rated power (W) |
Parts number |
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(C101, 102) |
resistor (Ω |
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25-48 |
100 |
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3 |
87-A00-247-090 |
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49-140 |
220 |
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5 |
87-A00-232-090 |
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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 Turn on the AC main power.
2 Confirm that the main power is turned on and the HOLD terminal of the MICROCOMPUTER keeps the “H” level or not. 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.
– 4 – |
In such a case, check also if the POWER AMPLIFIER circuit or power supply circuit has any abnormalities or not.
2-2. Regarding reset
There are cases that the machine does not work correctly because the MICROCOMPUTER is not reset even though the AC power cord is re-inserted, or the software reset (pressing the STOP key + POWER key) is performed.
When the above described phenomenon occurs, it can lead to wrong judgement as if the MICROCOMPUTER is defective and to exchange the MICROCOMPUTER. In such a case, perform the forced-reset by the following procedure and check good or no good of the MICROCOMPUTER.
1 Remove the AC power cord.
MICROCOMPUTER |
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MICRO- |
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FRONT C.B |
18 |
%VSS |
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15 |
C113 |
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COMPUTER |
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*VDD |
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C113 |
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FRONT C.B |
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Short with tweezers. |
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Fig-2-2
2Short both ends of the electrolytic capacitor C113 that is connected to VDD of the MICROCOMPUTER with tweezers.
3Connect the AC power cord again. If the MICROCOMPUTER returns to the normal operation, the MICROCOMPUTER is good.
Note: The reference number or MICROCOMPUTER pin number of transistor (Q110) and electrolytic capacitor (C113) can change depending on the models. Be sure to check the reference numbers on schematic diagram before starting the discharging work.
2-3. Confirmation of soldering state of MICROCOMPUTER
Check the soldering state of the MICROCOMPUTER in addition to the above described procedures. Be sure to exchange the MICROCOMPUTER after surely confirming that the trouble is not caused by poor soldering but the MICROCOMPUTER itself.
– 5 –
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