Jvc A X4 Service Manual

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K3314

STEREO INTEGRATED AMPLIFIER

No. 2509
Dec. 1979

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Contents

Pages
1. Specifications ........................................................................ 1
2. RemovalProceduresofTopCover............................................................. 2
3. Main Parts Location .................................................................... 2
4. Exploded Views and Part Numbers
4-(1) Front Panel .................................................................. 3
4-(2) Rear Panel ........................ , ........................................... 3
4-(3) Chassis Base Assy .............................................................. 4
5. Block Diagram ....................................................................... 5
6. New Technology
6-(1) New Development of IC in Super A Circuit ............................................. 6
6-(2) DC Servo Type Equalizer Circuit with EL FET ........................................... 6
7. Power Amplifier Adjustment Procedures
7-H) Center Voltage ................................................................ 7
7-(2) Idling Current ................................................................. 7
8. Printed Circuit Board Ass'y and Parts List
8-(1) TDS-5 LED Power Supply P.C.Board Ass'y .......................................... 8
8-(2) TXX-215 Power Amp., Power Supply and Speakers P.C. Board Assy ............................ 8
8(3) TXX-229 SEA (Sound Effect Amplifier) P.C. Board Assy .................................. 11
8(4) TXX-216 Equalizer Amp. and Source Selector P.C. Board Ass'v .............................. 13
8-(5) TPS-234 AC Socket P.C. Board Ass'y ............................................... 15
8-(6) TPS-255 AC Fuse P.C. Board Assy ................................................ 15
8-(7) TAP-282 Driver Amp. P.C. Board Assy .............................................. 16
9. Packing Materials and Part Numbers ........................................................ 18
10. Accessories List ........................ ' .............................................. 18
11. AoX4 Schematic Diagram ............................................................... 19
12. Parts List with Specified Numbers for Designated Areas ........................................... 21

Warning: When replacing the parts marked with a?) , be sure to use the designated parts to ensure safety.

1. Specifications

Input Sensitivity/Impedance
Phone (MM) : 2.5 mV/47 k9

Over all Specifications

Output Power : 60 watts per channel min. RMS

(TUNER, AUX, TAPE (both channels driven, into 8 $2
+SP. OUT) from 20 Hz to 20 kHz with no
more than 0.005% THD)
63 watts per channel min. RMS
(both channels driven, into 8 Q
at 1 kHz)
Total Harmonic Distortion: 0.005% at rated output, from
(TUNER, AUX, TAPE 20 Hz to 20 kHz, 8 Q
->SP.OUT) 0.001% at rated output 1 kHz,
8 9.
(Measured by HP Audio Analyzer
System)

Phone (MC)

: 200 uV/100 $2

TUNER, AUX, TAPE : 150 mV/4? kfl

Signal-toNoise Ratio
Phono (MM)

Phono (MC)

:84 dB (IHF, A net, short circuit)

83 dB (new IHF)

:67 dB (IHF, A net, short circuit)

76 dB (new IHF)

TUNER, AUX, TAPE : 109 dB (IHF, A net, short cir-

Tone Controls (S.E.A.)
Center Frequencies

Control Range

cuit), 83 dB (new IHF)

:40, 250, 1 k, 5 k, 15 kHz

:i12dB

Phono Equalizer Section (Phono-> REC. OUT)

Phono Overloard

0.02% at rated output, from Phono (MM) : 220 mV at 1 kHz, 0.005% THD
5 Hz to 50 kHz, 8 $2 Phono (MC) : 15 mV at 1 kHz, 0.005% THD
Intermodulation Distortion : 0.004% at rated output, 8 9. RIAA Phono Equalization
(TUNER, AUX, TAPE (MM) : :0.3 dB (20 Hz - 20 kHz)
->SP. OUT) (MC) : $0.5 dB (30 Hz - 20 kHz)
Power Band Width : 5 Hz - 60 kHz (IHF, both chan- E0 Subsonic Filter : -6 dB/Oct. (18 Hz)
(TUNER, AUX, TAPE nels driven, 8 Q, 0.02% TH D) Total Harmonic Distortion
->SP. OUT) +0 Phono (MM) : 0.005% at 10 V output, 20 Hz -
Frequency Response : DC - 100 kHz _3 dB 20 kHz
(TUNER, AUX, TAPE Phono (MC) : 0.02% at 10 V output, 30 Hz -
-+SP. OUT) 1 20 kHz)
Damping Factor : 75 (1 kHz, 8 .Q) Rec. Output/Impedance : 150 mV/810 9
Power Specifications : See page 21
Dimensions & Weight
Dimensions Weight
Hight Width Depth Net Gross

U.S.A. & Canada

43/ (12.1 cm)

18-5/ " (47.4 cm)

13-5/8" (34.5 cm)

19.0 lbs. (8.6 kg)

22.1 lbs. (10 kg)

All Other Areas

4-3/4" (12.1 cm)

17-3/ " (45.0 cm)

13-5/ " (34.5 cm)

19.0 lbs. (8.6 kg)

22.1 lbs. (10 kg)

A-X4
No.2509

Design and specifications subject to change without notice.