Aiwa AX-7400 Service Manual

(SERVICE MANUAL)
Set using ISO screws
DATE OF ISSUE 30/10/1977
SPECIFICATIONS
GENERAL
Semiconductors: 1 IC, 1 FET, 47 transistors, 25 diodes &
1 LED
AX-7400EE: 120V/220V
(Switchable) 50/60 Hz
AX-7400UK: AC120V/240V
(Switchable) 50/60 Hz
Power consumption: 205W (MAX)
Dimensions: 420(W) x 150(H) x 360(D} mm
Weight: 9.0 kg
Power source:
FM TUNER SECTION
Frequency ranges: 87 ~109 MHz
Intermediate frequency:
10.7 MHz +0.1 MHz
Frequency scale accuracy:
+150 kHz (88 MHz}
+200 kHz (98 MHz)
+150 kHz (108 MHz)
Noise limit sensitivity: AX-7400EE: (SN26 dB, div 40 kHz)
3+2 dB (88, 98, 108 MHz)
AX-7400UK: (SN30 dB, div 75 kHz,
THD 3%)
7 <10dB (88 MHz)
7< 9B (98, 108 MHz)
Image frequency interference ratio:
45 > 40 dB (98 MHz}
Intermediate frequency interference ratio:
75 > 70 dB (98 MHz)
Muting sensitivity: 26+4dB
Effective selectivity: AX-7400EE: {tune out 300 kHz,
div 40 kHz)
60 > 55 dB
AX-7400UK: (tune out 400 kHz,
div 75 kHz)
65 > 60 dB
Capture ratio: 1.5 +1 dB
Separation: 40 > 35 dB (1 kHz)
SN ratio: 63 > 58 dB {input 60 dB)
AM TUNER SECTION
Frequency ranges: 515~1650 kHz
intermediate frequency:
AX-7400EE: 455 kHz +5 kHz
AX-7400UK: 468 kHz +5 kHz
Frequency scale accuracy:
+20 kHz (600 kHz}
+30 kHz (1000 kHz)
+35 kHz (1400 kHz)
Noise limit sensitivity: 46 < 50 dB (600, 1000, 1400 kHz)
(SN20 dB)
Image frequency interference ratio:
40 > 35 dB (1400 kHz)
Intermediate frequency interference ratio:
32 > 25 (input 74 dB, 1000 kHz)
IF selectivity: +25/—25 +6 dB (1000 kHz)
Tuning hum: 44 > 36 dB {input 74 dB, 1000 kHz)
AGC characteristic: | 50 +5 dB (1000 kHz)
PRE AMP SECTION
<PHONO AMP SECTION>
Sensitivity/impedance: 2.5 mV —52 +2 dB/47 kQ
Gain: 35.5 +1 dB (1 kHz)
Allowable input: 120 > 100 mV (1 kHz 0.5%)
Distortion: 0.4 < 0.5% (input 100 mV>, 1 kHz)
RIAA curve deviation: +0 +0.8 dB (30 Hz~15 kHz)
Separation: 35 ah dB (1 kHz)
SN ratio: 65 2 60 dB
<TAPE-1, AUX SECTION>
Sensitivity/impedance: 150 mV —16.5 +2 dB/470 kQ
Gain: 0 +9 dB (1 kHz)
Distortion: 0.05< 0.1%
Frequency response: +0 yp (99 H2~50 kHz)
—
Separation: 40 an dB
SN ratio: 70 <65 dB
CONTROL MAIN AMP SECTION
Gain: 37.5 +3 dB (1 kHz)
Tone controls: BASS
+8, —7 dB/+6, —5 dB +1.5 dB (100 Hz)
400/200 Hz turnover frequency
TREBLE
+8, —10 dB/+5, —6 dB +1.5 dB (10 kHz)
2.5/5 kHz turnover frequency
Loudness Response: +7 +1.5 dB {100 Hz)
{With volume at -40dB) +4 +1.5 dB (10 kHz)
Continuous power output: 32W + 32W > 30W + 30W (420)
1 kHz {both channels driven) (distortion 0.5%)
Harmonic Distortion: 0.5% < 0.8% (1 kHz, 30W + 30W)
0.05% < 0.1% (1 kHz, 1W + 1W)
27W + 27W > 25W + 25W
(40 Hz~10 kHz, distortion 0.5%)
0.6 < 0.8 mV (482)
Power bandwidth:
Residual noise:
® Specifications and external appearance are subject to change
without notice due to product improvement.