Vitek VT-3487 Service Manual
NE-566(12.5W)
MICRO HI-FI SYSTEM
NE-566 (PLL+MP3)
MODEL:NE-566
CAUTION: Before servicing the chassis, read the " important servicesafetyinformation"
section on page 2 of this manual.
PORTABLE RADIO CASSETTE WITH CD/MP3 PLAYER
SPECIFICATIONS CONTENTS
AM/FM TUNER SECTION
ANTENNASYSTEM
TUNING RANGE
AUDIO SECTION
SPEAKER IMPEDANCE : 4OHM
GENERAL : 12.5W x 2
POWER INPUT : ~AC 230V-50Hz
AC POWER CONSUMPTION
MAIN DIM : 267.5(L) (H)mmx152(W)x218.5
SPEAKER DIM : 140 mm(L)x215(W)x218.5(H)
WEIGHT : 5.49Kg
AM: FERRITE BAR
FM: LEAD WIREAND 75 OHM JACK
AM: 522 - 1620kHz
FM: 87.5 - 108MHz
IMPORTANT SERVICE SAFETYINFORMATION---2
DISASSEMBLY INSTRUCTIONS--------------------- 3
ADJUSTMENTLOCATIONS----------------------------4
ALIGNMENTPROCEDURES-----------------------5 -11
VOLTAGECHARTS--------------------------------12 - 14
IC BLOCK DIAGRAMS----------------------------15 - 19
BLOCK DIAGRAM---------------------------------------20
WIRING DIAGRAM-------------------------------------21
SCHEMATICDIAGRAMS-------------------------22 - 28
PRINTED CIRCUIT BOARDS---------------------29-32
EXPLODED VIEW/PARTSLIST(CABINET)---33 -35
SERVICE PUBLICATION
NOTE: All the specifications and features are subject to change without notice.
7th Floor, Chung Mei Centre,
15A Hing Yip Street, Kwun Tong, Kowloon, Hong Kong.
Tel:(852)2790 3392 (12 Line), Fax: (852)2341 8874
Email Address: info@nelson.com.hk
IMPORTANT SERVICE SAFETY INFORMATION
1. SAFETY PRECAUTIONS
Before returning a unit to the customer, always make a safety
check of the entire unit, including, but not limited to the
following items:
a. Be sure that no built-in protective devices are defective
and/or have been defeated during servicing.
(1)protective shields are provided to protect both the
technician and the customer. Correctly replace all
missing protective shields including any removed for
servicing convenience.
(2)when reinstalling the chassis and/or other assemblies in
the cabinet, be sure to put back in place all protective
devices, including , but not limited to , nonmetallic
control knobs, insulating fishpapers. adjustment and
compartment covers/shields and isolating resistor/
capacitor networks. Do not operate this or permit it to be
operated Without all protective devices correctly
installed and functioning .
b. Be sure that there are no cabinet openings through which
an adult or child might be able to insert their fingers and
contact a hazardous voltage. Such openings include, but
are not limited to, excessively wide cabinet ventilation
slots, and an improperly fitted and/or incorrectly secured
cabinet back cover.
c. Leakage current hot check - with the unit completely
reassembled ,plug the AC line cord directly into a 120V
AC outlet. (Do not use an isolation transformer during this
test.) Use a leakage current tester or a metering system
that complies with American National standards Institute
(ANSI) C101.1 Leakage Current for Appliances and
Underwriters Laboratories(UL) 1410 (50.7). WITH THE
UNIT AC switch first in the ON position And then in the
OFF position, measure from a known earth ground (metal
water pipe, conduit, etc.) To all exposed metal parts of
the Unit (antennas, handle bracket, metal cabinet, screw
heads , metallic overlays, control shaft, etc.) Especially
any exposed metal parts that offer an electrical return
path to the chassis. Any current measured must not
exceed 0.5 milliamp, reverse the unit power cord plug in
the outlet and repeat test .
ANY MEASUREMENTS NOT WITHIN THE LIMITS
SPECIFIED HERENING INDICATE A POTENTIAL SHOCK
HAZARD THAT MUST BE ELIMINATED
RETURNING THE
UNIT TO THE CUSTOMER.
AC LEAKAGETEST
DEVICE
UNDER
TEST
2-WIRE CORD
ALSO TESTWITH
PLUG REVERSED
(USING ACADAPTER
PLUG AS REQUIRED)
TEST ALL
EXPOSED METAL
SURFACES
(READING SHOULD
NOTBEABOVE
0.5mA)
LEAKAGE
CURRENT
TESTER
EARTH
GROUND
d. Insulation resistance test cold check:
unplug the power supply cord and connect a jumper wire
between the two prongs of the plug .
Turn on the power switch of the unit.
Measure the resistance with an ohmmeter between
jumpered AC PLUG AND EACH Exposed metallic cabinet
part on the unit, such as screw heads, antenna, control
shafts, handle brackets, etc. When the exposed metallic
part has a return path to the chassis , the reading should
be between 1 and 5.2 megohms. When there is no return
path to the chassis, the reading must be infinite If it is
not within the limits specified, there is the possibility of a
shock hazard, and the unit must be repaired and
rechecked before it is returned to the customer.
ANTENNA
TERMINAL
EXPOSED
METAL
PART
OM
OHMMETER
2. PRODUCT SAFETY NOTICE
some electrical and mechanical parts have special safety
related characteristics which are often not evident from
visual inspection. Nor can the protection they give
necessarily be obtained by replacing them with
components rated for higher voltage , wattage, etc. Parts
that have special safety characteristics are identified by
a on schematic and parts list. Use of a substitute
replacement that dose not have the same safety
characteristics as the recommended replacement part
might create shock, fire, and/or other hazards. Product
safety is under review continuously and new instructions are
issued whenever Appropriate.
3. Servicing precautions
CAUTION: before servicing the unit covered by this service
by this service manual and its supplements. Read and follow
the SAFETY PRECAUTIONS on this page.
NOTE: if unforeseen circumstances create a conflict
between the following servicing precautions and any of the
Safety precautions, always follow the safety precautions.
Remember: safety first.
General servicing precautions.
a. Always unplug the unit s AC power cord from the AC
power source Before:
(1)removing or reinstalling any component, circuit board,
module or any other unit assembly.
(2)disconnecting or reconnecting any unit electrical plug or
other Electrical connection.
(3)connecting a test substitute in parallel with an electrical
capacitor caution: a wrong part substitution or incorrect
polarity installation Of electrolytic capacitors may result in
an explosion hazard
b. Do not defeat any plug/socket b+ voltage interlocks with
which the unit covered by this service manual might be
equipped.
c. Do not apply AC power to this unit and/or any its electrical
assemblies unless all solid-state device heat sinks are
correctly installed.
d. Always connect a test unit instrument s ground lead to
the unit s chassis ground before connecting the test
instrument s positive lead always remove the test
instrument s ground lead last.
4. Laser precautions
Warning!
(1)When servicing.(Incase it isnecessary to confirm laser
Beam emission ) besure not toplace your eyes any
closer than1or 30cm from thesurface of the objective
lens on the optical pickup block.
HANDLING THE LASERPICKUP
( 2)Laser Diodesare Extremely Susceptibleto damage from
static electricity even if a static dischargedies not ruin
the diode, itcan shorten its lifeor cause itto work
improperly.When replacing the pickup, usea conductive
maton the floorand desk andwear a wrist band
connected to groundthrough a 1Mohm resistor
to protect the laserdiode from staticdamage. If thelens
should get dusty, blow off thedust carefully fromthe
object.
(3)There areno adjustable parts in the pickupassembly. If it
is defective, replace the wholepickup assembly.
CAUTION: USE OF CONTROLS, ADJUSTMENTS OR
PERFORMANCE OF PROCEDURES HEREIN MAY
DANGER: IF INTERLOCK FAILS OR IS DEFEATED, THE LASER
RESULT IN HAZARDOUS RADIATION
LIGHT IS ABLE TO FUNCTION. THE LASER IS
INVISIBLE, AVOID DIRECT EXPOSURE TO BEAM.
EXPOSURE.
2
MODEL NE -566
DISASSEMBLY INSTRUCTIONS
3X10KA 3X10KA
3X10PA 3X10PA
3
MODEL NE -566
ADJUSTMENTLOCATIONS
4
MODEL NE -566
MODEL:NE-566MP3
ALIGNMENT PROCEDURES
FM AND AM RF ALIGNMENT CHART ( IF )
Step item Input Circuit Output Circuit Tuner Adj - Adjustment
Setup Setup setting Point
Unless otherwise specified set switches as follows:
FM Function: FM
Adjust generator frequency to a center of the FM band where no FM broadcast exists
IF Connect FM IF Connect Co19 and GND FM in band Adjust for straight and
1 Adjustment sweep output IF-OUT terminal to end T104 symmetrical S-curve
terminal to IC102 IF sweep input terminal with max.amplitude.
2 FM Headphone jack or 87.5 MHz L105 Adjust L103 for max output
Band setup speaker terminal 108MHz Done
FM SG ANT. Headphone jack or 90.1 MHZ L104 Adjust for max.output and
3 Tracking (1) Terminal 90.1 MHz, speaker terminal MONO best waveform
1kHz, +-22.5kHz dev
4 Tracking (2) 106.1 MHz, 1 kHz Headphone jack or 106.1 MHz CT101 Same as above.
+-22.5 MHz dev speaker terminal
5 Repeat steps 3 and 4.
MW
IF Connect standard loop Connect input terminal MW in band Adjust tor max. amplitude
1 Adjustment antenna to output ter- genescope to detector end T101 with symmetrical 450 kHz.
minal of genescope output
2 MW Headphone jack or 522 kHz T102 Adjust L135 for max output
Band speaker terminal 1620 kHz CT103 Adjust CT133 for max output
3 Tracking (1) 612 kHz 400 kHz, Headphone jack or 612 kHz T103 Adjust for max.output and
3% mod speaker terminal best waveform
4 Tracking (2) 1404 kHz 400 kHz, Headphone jack or 1404 kHz CT102 Same as above.
3% mod speaker terminal
5 Repeat steps 3 and 4.
Date: 12-Apr-04
TAPE SECTION
HEAD ADJUSTMENT (AZIMUTH)
10 kHz test tape (example:MTT-114N) must be used for this adjustment. Connect to VTVM or oscilloscope to the headphone JCK or speaker terminal Press the play button.
Adjust the azimuth by using a screw driver to maintain the maximum L & R output voltage. Adjust tape. Please secure the
azimuth position by using locking paint.
RECODING BIAS OSCILLATOR FREQUENCY ADJUSTMENT
Connect the frequency counter to of R601 two ends.
Press REC button of tape .
Adjust T201 obtain 60 kHz +-100 HZ
5
MODEL NE -566
MODEL: NE-566PLL+MP3 (5W) Date:
Band: FM BRAND: QUELSS
Supply Voltage: AC 230 V Measured By:
Standard Output: 50 mw
Dummy Load: 4 ohm Approved By:
Modulation: 1 KHz 22.5 KHZ DEV
EQ or Tone at Flat Place Bass OFF Place
Frequency Range Low MHz 87.5 +/-0.3
IF Frequency MHz 10.7 +/-0.2
30db Quieting 90.1 MHz db 18 26
Sensitivity 98.1 MHz db 18 26
106.1 MHz db 18 26
Auto Locked 90.1 MHz db 26 32
Sensitivity 98.1 MHz db 26 32
ACA +300 KHz db 20 15
( 2-Signal ) -300 KHz db 20 15
Image Rejection AT 106.1 MHz db 22 16
IF Rejection AT 90.1 MHz db 50 40
-3db Limiting Sens . 1mv I/P db 18 26
AM Suppression 1mv I/P db 35 30
S/N (1mv input) Mono db 45 40
Stereo Sens db 20 26
Stereo Lamp On Sens. db 20 26
Separation R/L db 25 20
Audio Freq. Low Hz 80 ≦100
Response-3db High KHz 5 ≧3
Modulation Hum 1 mv I/P db 40 35
Hum & Noise(min.vol.) mv 1 3
Output (10% Dist) (MOD=40KHz) mW 4500 4000
Total Harmonic Distortion 1 mv I/P % 1 3
OSC Drop Out 1 mv I/P V
Current No signal mA
Consumption Max mA
ALIGNMENT PROCEDURES
NELSON ELECTRONICS LTD
FM RECEIVER PERFORMANCE DATA
Measuring Items Unite Norm Limit Sample1 Sample2
High MHz 108 +/-0.3
106.1 MHz db 26 32
Stereo db 35 30
6
MODEL NE -566
MODEL: NE-566PLL+MP3 (5W) Date:
Band: MW
Supply Voltage: AC 230 V Measured By:
Standard Output: 50 mw
Dummy Load: 4 Ohm Approved By:
Modulation: 1 KHz 30%
EQ or Tone at Flat Place Bass OFF Place
Frequency Range Low KHz 522 +/-10
IF Frequency KHz 450 +/-2
ALIGNMENT PROCEDURES
NELSON ELECTRONICS LTD
MW RECEIVER PERFORMANCE DATA
Measuring Items Unite Norm Limit Sample1 Sample2
High KHz 1620 +/-10
20db Quieting 612 KHz dB/M 60 66
Sensitivity 999 KHz dB/M 60 66
1404 KHz dB/M 60 66
Auto Locked 612 KHz dB/M 66 70
Sensitivity 999 KHz dB/M 66 70
1404 KHz dB/M 66 70
S/N 5mv/M dB 35 30
ACA +9 KHz dB 18 12
-9 KHz dB 18 12
Band Width-6dB +Side KHz 3 10
-Side KHz 3 10
Image Rejection AT 1404 KHz dB 35 30
IF Rejection AT 612 KHz dB 50 40
Spuerious Response 4-10MHz dB 40 35
10-30MHz dB 50 45
AGC FOM-10db 100mv/M dB 45 35
Audio Freq. Low Hz 80 ≦100
Response-6db High KHz 2.4 ≧2.0
Modulation Hum 100 mv/M dB 38 32
Hum (Volume At Min) mv 1 3
Output (10% Dist) (MOD=80%) mW 4500 4000
Total Harmonic Distortion 5mv/M % 2 4
OSC Drop Out 5mv/M V
Current No signal mA
Consumption Max mA
7
MODEL NE -566
MODEL: NE-566PLL+MP3 (5W) Date:
Supply Voltage: AC 230 V
Standard Output: 50 mw Measured By:
Dummy Load: 4 Ohm
0DB=1V Approved By:
EQ or Tone at Flat Place Bass OFF Place
Tape Speed 4.76cm/sec.1
Tape Speed Enor at 3 KHz % +3/-2
ALIGNMENT PROCEDURES
NELSON ELECTRONICS LTD
CASSETTE PLAYBACK PERFORMANCE DATA
7
/
I n
8
Measuring Items Unite Norm Limit Sample1 Sample2
WOW & Flutter at 3 KHz % 0.25 0.35
Play Freq Response at 125 Hz dB +/-3 +/-6
at 1 KHz dB 0 0
at 10 KHz dB +/-3 +/-6
P/B S/N (1K odB) DC Opetation dB
AC Optetaion dB 45 40
Hum & Noise Min Vol mv 1 3
(AC Optetaion) Max Vol mv 20 30
10% THD Output (1KHz odB) RMS mw 4500 4000
THD 1KHz -10dB % 1 2
Track Crosstalk dB 40 30
Channel Separation R-L dB 40 30
L-R dB 40 30
Channel Balance -10dB 1KHz dB 1 3
No Signal Current Min. Vol. Blank Tape mA
Max Output Max. Vol A
Play Torque g/cm
F.F Torque g/cm
Rew Torque g/cm
Time for Play Min
Time for F.F Sec
Time for Rew Sec
8
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