Aiwa Z L900 Service Manual
Z-L900
LH
SERVICE MANUAL
COMPACT DISC STEREO
CASSETTE RECEIVER
CD
CASSEIVER
Z–L900
• This Service Manual is the "Revision Publishing" and replaces "Simple Manual"
Z-L900 (LH), (S/M Code No. 09-001-424-5T1).
• If requiring information about the CD mechanism, see Service Manual of
6ZG-1 ZRDM, (S/M Code No. 09-001-338-7N2).
CX–ZL900
BASIC TAPE MECHANISM : 2ZM-3MK2 PR5NM
BASIC CD MECHANISM : 6ZG-1 ZRDM
SPEAKERSYSTEM
SX–WZL900
REMOTE
CONTROLLER
RC–ZAS12
S/M Code No. 09-004-424-5R1
REVISION
DATA
SPECIFICATIONS
<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>
Mid-high frequency amplifier
Power output Rated: 55 W + 55 W (8 ohms,
T.H.D. 1 %, 1 kHz)
Reference: 70 W + 70 W (8 ohms,
T.H.D. 10 %, 1 kHz)
Total harmonic distortion 0.15 % (15 W, 1 kHz, 8 ohms )
Low frequency amplifier
Power output Rated: 170 W + 170 W (6 ohms,
T.H.D. 1 %, 75 Hz)
Reference : 210 W + 210 W (6 ohms,
T.H.D. 10 %, 75 Hz)
Total harmonic distortion 0.15 % (45 W, 75 Hz, 6 ohms)
Inputs VIDEO/AUX: 310 mV (adjustable)
PHONO: 400 mV (47 kohms)
MIC 1, MIC 2: 1.4 mV (20 kohms)
Outputs CD DIGITAL OUT (OPTICAL)
SPEAKERS HIGH FREQ:
accept speakers of 8 ohms or more
SPEAKERS LOW FREQ:
accept speakers of 6 ohms or more
SURROUND SPEAKERS:
accept speakers of 8-16 ohms or
more
PHONES (stereo jack):
accepts headphones of 32 ohms or
more
<Compact disc player section>
Laser Semiconductor laser (λ =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)
Wow and flutter Unmeasurable
<Speaker system SX–WZL900>
Cabinet type 3 way, built-in subwoofer
Speakers Subwoofer:
220 mm cone type
Full range:
120 mm cone type
Super tweeter:
60 mm cone type
Impedance 6 ohms/8 ohms
Output sound pressure level 89 dB/W/m
Dimensions (W x H x D) 260 x 495x 355 mm
Weight 9.5 kg
<General>
Power requirements 120 V/220 - 230 V/240 V AC
(switchable), 50/60 Hz
Power consumption 275 W
Power consumption in With power-economizing mode
off: 45 W
With power-economizing mode
on: 0.9 W
Dimensions of main unit 360 x 395.3 x 402.3 mm
(W x H x D)
Weight of main unit 13.2 kg
<Cassette deck section>
Track format 4 tracks, 2 channels stereo
Frequency response CrO2 tape: 50 Hz – 16000 Hz
Normal tape: 50 Hz – 15000 Hz
Signal-to-noise ratio 50 dB (CrO2 tape peak level,
above 400 Hz)
Recording system AC bias
Heads Deck 1 : Playback head x 1
Deck 2 : Recording/Playback head
x 1, erase head x 1
• 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.
– 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.
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.
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
(KSS-213F)
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
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
11
1 Remove the AC power cord.
11
22
2 Connect a discharging resistor at an end of lead wire that
22
has clips at both ends. Connect the other end of the lead
wire to metal chassis.
33
3 Contact the other end of the discharging resistor to the
33
positive (+) side (+VH) of C101. (For two seconds)
44
4 Contact the same end of the discharging resistor as step
44
33
3 to the negative (-) side (-VH) of C102 in the same way.
33
(For two seconds)
55
5 Check that voltage across C101 and C102 has decreased
55
to 1 V or less using a multimeter or an oscilloscope.
Select a discharging resistor referring to the following table.
Charging voltage (V) Discharging
(C101, 102) resistor (Ω)
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.
Rated power (W) Parts number
MAIN C.B
D101
3
C101 C102
22
Fig-1
4
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
11
1 Turn on the AC main power.
11
22
2 Confirm that the main power is turned on and the HOLD terminal of the MICROCOMPUTER keeps the “H” level or not.
22
33
3 When the HOLD terminal is “L” level, the abnormality detection circuit is judged to be working correctly and the
33
MICROCOMPUTER is judged to be good.
– 4 –
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