Page 1
MODEL SX.3gOO COMES IN TWO VERSIONS DISTINGUISHED AS FOLLOWS:
Type Voltage Remarks
KU 120V only U.S.A. model
5/U I 10V, 120V, 22O and 240V (Switchable) U.S. Military model
This service manual is applicable to the KU type. When repairing the S/G type, please see the
additional service manual (see pages 47 -56l..
CONTENTS 1. SPECIFICATIONS
1. spECtFtcATtoNS 2 Power Amplifier Section
2' FRoNr PANEL FACILTTIES a Continuous Power 0utput 0f 120 wattsxper chan-
3' BLocK DIAGRAM 7 nel, min., at 8ohms from 20Hertz to 20,000
4. clRCUlr DESCRIPTIoNS Hertz with n0 m.re than 0.005% tolal harmo-
4.1 FM Tuner Section 8 niC diStOftiOn.
4.2 AM Tuner Section 9 To,rl Harmonic Distortion (20 Hertz to 20,000 Hertz,
4.3 Audio Section 9 g ohms)
4.4 DisplayCircuits ....... 11 continuousratedpoweroutput.. Nomorethan0.005%
4.5 Protection Circuit 13 60 watts per channel power
4'6 Surge current suppressor " " " ' l5 ,",1r',jlltr,r.ion oirioriion iuo rrrrrltrl;f ;::ltjT:"fl 1E 5' DISASSEMBLY ' ' 15 continuous rated power output . . No more than 0.005%
6. PARTS LOCATION 16 60 watts per channel power
7. DIAL CORD STRINGING . 18 output ' . . . ' No more than 0.005%
g. ADJUSTMENTS Frequency Response
8.1 Audio Section 1e rnpr.s.nriiiui,vli,.np.oun..t,i;ff T iorTln?,t'.2
*! aa
8.2 Tuner Section. 20 . . . . . 'l V/50 kilohms
9, SCHEMATIC DIAGRAM 24 OUtPUt
10. p.c. BoARDS coNNECTToN DTAGRAM 29 -speaker ' ' ' ' ' A' B' A+B
Damping Factor (20 Hertz to 20,000 Hertz, 8 ohms)
I1.PARTSLIST. 35 ...60
12. EXpLoDED vtEW 41 Hr..;; rtr.ir. iiHi, rrrortcircuiteo, A network)
13. PACK|NG.... 46 ""' 115d8
ADDTTTONAL SERVTCE MANUAL FOR S/G TYPE 41 Preamplifier Section
I nput (Sensitivity/lmpedance)
PHONO 1,2. . . 2.5mV/50 kilohms
AUX, TAPE PLAY 1, 2,
ADAPTORIN ... ... 150mV/50kilohms
Phono Overload Level (T.H.D. 0.005%, 1,000 Hertz)
PHONO 1.2... 300mV
OutPut ( Level/l mPedance)
TAPE REC 1, 2. ADAPTOR OUT
150mV
PREAMP OUT (RL: 50 kilohms)
. . . . 1Vl1 kilohms (Volume: max.)
Total Harmonic Distortion (20 Hertz to 20.000 Hertz)
PHONO 1.2 (REC OUT) . . . . . . No more than 0.005%
(10V output)
Page 2
sx-3900
AUX, TAPE PLAY 1, 2. ADAPTOR IN
No more than 0.005%
(10V output)
Frequency Response
PHONO (R IAA Equalization)
. . . 20 Hertz to 20,000 Hertz t0.2dB
AUX, TAPE PLAY 1,2, ADAPTOR OUT
Ton. contror
' ' ' ' ' 7 Hertz to 80 000 Hertz +9 dB
BASS . !4dB/!7dB (100H2)
f u rnover F requency : 2OOHz/ 400H2
TREBLE +gdB/t7dB (10kHz)
Tu rnover Frequencv : 2kHz I 4k{z
Filter
LOW. . 15Hz (-6dB/oct.)
HIGH . 8kHz (-6dB/oct.)
Loudness Contour (Volume control set at -40dB position)
. . . . +6dB (100H2), +3dB (10 000H2)
Hum and Noise (lH F, short-circuited, A network)
PHONO . .. . .. 86dB
AUX,TAPE PLAY 1,2,
AM Tuner Section
Sensitivity (lH F, Ferrite antenna) . .
(lHF, Ext. antenna) " .
Selectivity
Signal-to-Noise Ratio
lmage Response Ratio
lF Response Ratio. .
Antenna
Audio Section
Output ( Level/l mpedance)
FM (100% Mod.).
AM (30% Mod.) .
Semiconductors
lCs...
FETs.
Tra nsistors
Diodes
M iscellaneous
Power Requirements
Power Consumption
Dimensions
Weight (without package)
Furnished Parts
Operating instructions
FM T-type antenna
300sV/m
1 SpV
30dB
50d B
40dB
40dB
Ferrite loopstick
a ntenna
ADAPTORIN...
Attenuator.
FM Tuner Section
Usable Sensitivity (lH F )
50dB Ouieting Sensitivity
MONO
STEREO
Signal-to-Noise Ratio
MONO
STE R EO
Distortion (at 65dBf )
MONO 100H2.
lkHz .
6kHz '
STEREO 100H2.
ikHz .
1 05dB-20d8
9.8dBf (1.7pV)
14.2dBf (2.8pV)
36dBf (34.7pV)
83dB (at 65dBf)
78dB (at 80dBf)
0.1o/o
o.o7%
oJ%
O.27o
o.15%
O.2To
650mV/2.4 kilohms
20OmV /2.4 kilohms
t5
o
89
62
AC 120V.60H2
350W (UL)
526(W) x 176(H) x
452(D) mm
20-11/16(wl x6-1 5/16
(H) x 17-14/16(Dl in
2Okg (441b 2ozl
1
1
* Measured pursuant to the Federal Trade Commission's Trade Regulation rule on Power Output Claims for Amplifiers.
NOTE:
Specifications and the design subject to possible modifications without notice due to improvements. 6kHz
Capture Ratio. . 1.0d8
Alternate Channel Selectivity
400kHz ......80dB
Stereo Separation
1kHz. ......50d8
3OHzto15kllz. ...... 35dB
Frequency Response
....2OHzto15kHz1!jaa
Spurious Response Ratio . . . . . . . 100dB
lmageResponseRatio ... 90dB
lFResponseRatio.. .... 100d8
AMSuppressionRatio ... 60dB
SubcarrierProduct Ratio . . . . . . . 64dB
SCARejectionRatio .... 64dB
Muting Threshold 19.2dBf (SgV)
Antenna Input . 300 ohms balanced,
75 ohms unbalanced.
