Sherwood S-7600-FET Service Manual

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M O D E L S . 7 6 O O . F E T A L L . S I L I C O N S O L I D . S T A T E
FM STEREO RECEIVER SERVICE MANUAL
Z e r o - C e n t e r T u n i n g M e t e r
F o r F M , t u n e f o r z e r o ( c e n t e r e d )
i n d i c a t i o n b e t w e e n l e f t - h a n d a n d
r i g h t - h a n d p o i n t e r d e f l e c t i o n . F o r
A M , t u n e f o r m a x i m u m l e f t - h a n d
p o i n t e r d e f l e c t i o n .
S e l e c t o r S w i t c h .
Selects left and
right input channPr
simultaneou sly.
T o n e c o n t r o l s f o r b o t h c h a n n e l s .
Adjustnent of the Bass or Treble
control knob wiil vary the tone of
b o t h c h a n n e l s s i m u l t a n e o u s l y .
S t e r e o I n d i c a t o r L i g h t .
I n d i c a t e s r n u l t i p l € x e d F M
s t e r e o b r o a d c a s t s .
Controls left-to-right
s t e r e o b a l a n c e . P u l l o u t w a r d
f o r m o n o p h o n i c l i s t e n i n g .
F M b a n d m a r k e d i n n r c .
A M b a n d m a r k e d i n k c .
S e e y o u r l o c a l n e w s p a p e r f o r t h e
f r e q u e n c y a s s i g n m e n t E o f y o u r
l o c a l s t a t i o n s .
Serial No. A701001 to /^702t02
K n o b .
S t e r e o h e a d p h o n e
output.
R e n r o t e S t e r e o S p e a k e r s O n - o f f S w i t c h .
W i ] l d i s c o n n e c t t h e s e s p e a k e r s w h e n
. l a n r a c e 6 r i r i o h f
Main Stereo Speakers On-off Switch.
W i l l d i s c o n n e c t t h e s e s p e a k e r s w h e n
s s e d r i g h t .
Tape Monitor/Auxiliary
Input Switch.
Normally depressed lefi. If depressed
right, the Monitor/Auxiliary inputs
s i l l b e s e l e c t e d .
L o u d n e s s c o m p e n s a t i o n s w i t c h .
Normally set to ]eft. If depressed
r i g h t , t h e c i r c u i t w h i c h b o o s t s b a s s
a t l o w s e t t i n g s o f l o u d n e s s c o n t r o l
w i l l b e d i s c o n n e c t e d .
MODEL S- Z600 - FET STEREO RECEIVER SPECIFICATIONS
\-
FM SENSITI\rITY: (IHF) 1.8 ;,rv for -30 db. noise and
distortion below L0070 mod.
TYPICAL SENSITIVITY: FM - 1.1 trrv for 20 db quieting,
6.0 trrvfor 50 db. S/N. AM - 2 ttv at 60lomod, for 6
db s/N.
TYPICAL SELECTIVITY: FM - 250KHz at -6 db, 820
KHz at -60 db. AM - 7.5KHz at -6 db.
FM DETECTOR: 800KHz peak/peak
FM CAPTURE RATIO: 2.6 db.
TUNING RANGE: 87.5 - 108.5 l.IHz
FM DISTORTION: 0.15V0 harmonic at t0070 mod.
FM CROSS-MODULATION REJECTION: -95db.
HUMANDNOISE LEVEL:FM - ?0 db below ljqo mod.
AM - 56 db below L00Vo mod.
FM STABILITY: +10KHz 17.0t7o)
FM OUTPUT: 0.? volts at 10070 FM
FM OSCILLATOR RADIATION: 3 db below FCC re-
quirements.
ANTENNAS: FM - 300-ohm balanced. AM - directable
ferrite rod w/external antenna connection.
FREQUENCY RESPONSE: FM mono: 20-20,000 FIz
!t/2
db"
F M S t e r e o : 2 0 - 1 5 , 0 0 0 H z + 1 / 2 d b .
AM: -6 db at 4.0 KHz.
Amplifier: 20-20,000 Hz 1L/2 dn.
\
YNPUTS: 2(RIAA) Phono-preamp , 2 tape monitor/aux.
OUTPUTS: 4 to 16 ohms , main & remote (left and
right) speakers, stereo headphone, and record output.
MUSIC POWER OUTPUT:8O watts at 4 ohms,50 watfs
at B ohms"
CONTINUOUS POWER OUTPUT (each channel): 30
watts at 4 ohms, 20watts at B ohms for l.Wo distortion.
INVERSE FEEDBACK: 35 db.
DAMPING FACTOR: 30:1 at 8 ohms.
TONE CONTROL RESPONSE: Flat setting, 20 Hz to
20KHz tl/Z db.
TONE CONTROL RANGE: 15KHz, 15 db boost or cut.
40 Hz. 20 db boost or cut.
PREAMP. EQUALIZER CURVES: AES/RIAA phono.
SENSITIVITY: Phono selectable 1.5mv, 6mv, 12mv,
Aux 0.4V
MAX. INPUT CAPABILITY: Preamp: 160mv.for less
than 170 dist. Aux: 3.0V for less than 170 dist.
MAX. HUM and NOISE:
Vol. control min.,-90 db (weighted) below rated
output.
Auxiliary
input ( controls maximum ),-80
db
(weighted) below rated output"
Phono input (controls flaQ, 60 db below rated output.
INTERCHANNEL CROSSTALK: Less than -45 db at
LKHz.
POWER CONSUMPTION: 115-125V, 60 Hz, 30 to 120
watts fused.
SIZE: 16-l/2 x 12 x 4-I/2 high.
SHIPPING WEIGHT: 27 lbs. (with case)
TRANSISTOR COMPLEMENT: 38 silicon transistors
(2 field-effect), 5 silicon rectifiers,
15 silicon diodes. 1 zener diode.