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MODEL SX-3700 COMES IN FOUR VERSIONS DISTINGUISHED AS FOLLOWS.
Typ. Voltag. Ramarks
KU 120V only U.S.A. model
KC '| 20V only Can-‚¬da model
11OV , 12OV ,22OV , end 24OV (Switchabls) Gen-‚¬ral exDort model
1 1OV . 12OV , 22OV , and 240V ( Switcha ble ) U.S. Military mod6l
e This service manual is applicable to the SX-3700/KU. For servicing of the other types, please
refer to the additional service manual.
CONTENTS
1. SPECTF |CATTONS ...........
2. FRONT PANEL FACILITIES . , . .
3. BLOCK DIAGRAM
4. CIRCUIT DESCR IPTIONS
4.1 FM Tuner
4.2 AM Tuner
4.3 Display Circuit . .
4.4 Equalizer Amplif ier . . . . . . .
4.5 Tone Control Amplifier . . . .
4.6 Power Amplif ier . . .... ...
4.7 Power Indicator Circuit .. -.
4.8 Protection Cirorit . . . . . . -.
5. DISASSEMBLY ......
6. PARTS LOCATION
2
..4
..6
..8
. 11
. 11
. 11
. 11
. 11
. 13
.14
17
18
19
19
21
za
30
34
J5
41
7. DIAL CORD STRINGING
8. ADJUSTMENTS
8.1 FM Tuner
8.2 AM Tuner
8.3 ldle Current Adiustment
8.4 FL IndicatorCircuit ... -.......
9. SCHEMATIC DIAGRAMS, P,C. BOARD
CONNECTION DIAGRAM AND PARTS
LIST
9.1 Schematic Diagram .
9.2 P.C. Board Conneaion Oiagram . . .
......16 l'
9.3 PansList.....
1O. PACKING
11. EXPLODEOVIEW....
12. ADDITIONAL SERVICE MANUAL SX.82O
l
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six-37C'c'
1. SPECIFICATIONS
Amplifier Section
Continuous power output of 45watts- per chan.
nel, min., at 8 ohms from 20Hertz to 20,000
Hertz with n0 more than0.0?% total harmonic
d i stort ion .
Total Harmonic Oistortion (20 Hertz to 20,000 Hertz.
8 ohms, f rom AUX)
continuous rated Dower outout . . No more than 0.02%
22.5 watts per channel power output
...... Nomorethan0,02%
Intermodulation Distortion (50 Hertz : 7,0O0 Henz =
4 : 1, 8 ohms, from AUX)
continuous rated oower output . . No more than 0.02%
22,5 watts per channel power output
...... Nomorethan0.02%
Damping Factor (20 Hertz to 20,000 Hertz, S ohms)
,"o,irs"",i,i"'ir),;;";;;";;
""
PHONO . 2.5mV/50 kilohms
AUX,TAPEPLAY 1,2 .......'l50mv/50kilohms
Phono Overload Level (T.H.O.0.02%, 1,000H2)
PHONO.
Output
TAPE REC 1,2 -.. .
Speaker .
Frequency Response
PHONO (R IAA Equalization)
250mV
l50mV
A, B, A+B
AUX, TAPE PLAY 1, 2
Tone Control
BASS ,,.
TREBLE.
Subsonic Filter
. . 20Hz to 20.000H2 10.2d8
. . . lOHzto IOO,OOOHZ]]dB
..... iSdB (100H2)
..... iSdB (10,000H2)
..... 15Hz (-tuB/oct)
Loudness Contour (Volume control set at -40d8 position)
...... +6dB{100H2)
Hum and Noise (lHF, short-circuited. A network)
PHONO . ........79d8
AUX,TAPE PLAY 1.2,. ..... 95dB
400kHz.
Stereo Separation
Distortion (at 65dBf)
MONO l00Hz ........
1kH2.........
6kHz.........
STEREO ,IOOHZ
1kHZ.........
6kH2.........
Capture Ratio
Alternate Channel Selectivity
o.'t70
o.o7./"
0.15%
o.2y,
o.15%
o.25%
1.ft8
75d B
.45d8
.35d8
. 2OHz to lskHz]3 3dB
. 65dB
.65d8
.90d8
.55dB
. 50dB
.65dB
. 19.2dBf (spv)
. 300 ohms balanced,
75 ohms unbalanced.
A
t
l kHz
30Hz to l5kHz
Frequency Response .
Spurious Response Ratio ..... .
lmage Response Ratio ... . . .,.
lF Response Ratio . . .
AN4Suppression Ratio. .. . . ...
SubcarrierProductRatio .. . . . .
SCA Rejection Ratio. .. . . . . . .
Muting Threshold
Antenna Input
AM Tuner Section
Sensitivity (lHF, Ferrite Antenna)
(lHF, Ext. antenna) . .
Selectivity
Signal-to-Noise Ratio. ...... . .
lmage Besponse Ratio,.... . . .
lF Response Ratio . . .
Antenna.
. 300rrV/m
.. 15pV
.. 27dB
. . 52dB
. . 32dB
. . 40d8
Ferrite loopstick antenna
,A
A
FM Tuner Section
Usable Sensitivity (lHF) . . .
50dB Ou ieting Sensitivity
MONO ..
STEREO .
Signal-to-Noise Ratio
t\40No . .
STEREO,
10.3dBf (1.8pV)
15dBf (3.1l]V)
37dBJ (39pV)
80dB {at 65dBf)
75dB (at 85dBf)
Miscellaneous
Power Requirements .......... AC 120V.60H2
PowerConsumption ... ..... 290W(UL)
Dimensions .. 480(W) x 145(H) x364(D)mm
18-14/16(W) x 5-11/16{H) x 14-5l16(D}in
Weight (without package)
Furnished Parts
11.6k9 {25 lb 9oz)
Operatinginstructions ...,,.... 1
FMT-typeantenna ........... 1
*Measured pursuant to the Federal Trcde commission's Trade Regulation tule on Power Output Claims for Amplifie6.
NOTE:
Specifications and the design subject to possible modifications without notice due to improvements.
A
