Vitek VT-3494 Service Manual
VT-3494 AM/FM STEREO TUNER
CASSETTE RECORDER
WITH CD-RW PLAYER
CONTENTS
Specifications..................................................................................................................................................2
Block Diagram ................................................................................................................................................4
Disassembly Instruction..................................................................................................................................5
Safety Checks.................................................................................................................................................6
Alignment and Adjustment..............................................................................................................................7
Troubleshooting............................................................................................................................................12
Printed Circuit Boards...................................................................................................................................14
Wiring Diagram.............................................................................................................................................22
Exploded View..............................................................................................................................................23
Mechanical Parts List....................................................................................................................................25
Electrical Parts List .......................................................................................................................................27
IC Lead Identification and Internal Diagram .................................................................................................42
IC Voltage Charts..........................................................................................................................................49
Schematic Diagrams.....................................................................................................................................53
SPECIFICATIONS
Power source : AC 230 V, 50 Hz
Load impedance : 8 ohm
Reference output : 500 mW
10% THD output : 12 W X 2
Speaker : 8 ohm X 2
Recording system : AC Bias
Erase system : Magnet Erase
BAND: AM 1 KHz 30% MOD.
Characteristic Unit Limit
Frequency Low KHz 522
Range High KHz 1629
Intermediate Frequency KHz 450 ±3
Usable 603 KHz
Sensitivity 999 KHz
(S/N 20 dB) 1404 KHz
Selectivity ± 9 KHz 1000 KHz dB 15
µV/m
µV/m
µV/m
BAND: FM 1 KHz 75 KHz DEV.
Characteristic Unit Limit
Frequency Low MHz 87.5
Range High MHz 108
Intermediate Frequency MHz 10.7 ±0.15
Usable 90.1 MHz
Sensitivity 98.1 MHz
(S/N 30 dB) 106.1 MHz
S/N at 1mV Input
98 MHz
µV
µV
µV
dB
2000
2000
2000
20
20
20
45
TAPE RECORDER
Characteristic Unit Limit
Play Frequency Response 125 Hz-8 KHz dB +3/-5
S/N Ratio MTT-112B dB 40
Track cross talk (W/Band Pass Filter) dB 45
Tape speed (3 KHz/-10 dB) % -2/+3
Wow & Flutter (3 KHz-JIS WTD) % 0.35
Channel separation (1 KHz/-10 dB) dB 26
2
CD
Test disc : PHILIPS test disc 444A
EQ : Classic
Functions : Play/Pause, Stop. Skip (<</>>), Repeat Play
Display : LCD Multi-Display
Digital signal processing
Optical pick/up : beam laser
Error correction : Cross Interleaved Reed-solomon Code
Digital filter : 16-bit linear
Sampling rate : 2 Times
Item Unit Limit
Frequency Response 100 Hz /16 KHz dB -2/+2
S/N Ratio dB 54
Interruption in information layer
Black dot
Eccentric disc
Dynamic range dB 60
Channel separation (W/Band Pass Filter) dB 45
µm
µm
µm
600
600
140
3
BLOCK DIAGRAM
DISPLAY
MCU &
TA2099
DIGITAL TUNING
AM/FM/IF+MPX
LEFT SPEAKER
LA4282
CD SERVO CD MECH
CD
TUNER
TC9422
EQ VOLUME
FUNCTION SWITCH
AUX
RIGHT SPEAKER
POWER AMP
TAPE
FM
ANT
FM.RF
TA2132F
AN7312
REC./PLAY AMP
R
L
PLAY/REC. HEAD
AC. SUPPLY
4
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