Technics SH-8055 Service Manual page 16

Mi SCHEMATIC DIAGRAM (@)
(This schematic diagram may be modified at
any time with the development of new tech-
nology.)
Input/Output control
Microphone amplifier
Pink noise generator
Band level control
Band pass filter
Power source
A
Input selector
INVERTER BUFFER
SUBTRACTOR ADDER
1C603
SVINJM2043SE susTRACTOR / ADDER
R621 |4.7K
+
R625 100K
25V220
cenlk33p |
15.3
O60
+ 2S8C2878
POWER ON/OFF
INVER"
{C602
SVITA75559
1
MUTING
BAND PASS FILTERS(L ch.)
iC 107
SVITA75559S 8
R641 1.5K
L ,
1c 601
LINE IN ( a SVITA75559S INVERTER / BUFFER
R Uch
IC601
L oe
LINE OUT (
R CS off<—e on —
tape |=2 S$2-2 le
a V
L Oo j
REC OUT ( et AE
O 2)
R off<—eon 2s
TARE
Reg |S WWE
bese seg eae oe_ ee S tape 2et S978 |
MKS TP ee ee I a MB aa
L © pink noise
PLAYBACK
R
kL
REC OUT ( asp eae [age Ah I ey ee
i=}
R 7
3
TAPE 2 «
R645 1.5K C301
L
q
25V47 @
PLAYBACK ( R646 ee: fy ee a
R Oo--—V SL o 0 R401 1.5K
gm straight -—e EQ
620 46V100 - Pete ke Oe, CU ('<é'ia<'"'<'é ":SC*iW SE
Mixing signal of
L ch. and R ch.
display mode
1C 103
SVITA75559S B PF
R215 2.2K R15 12K
1C109
SVITA75559S B
R213 2.2K
C304
25V47
R404;
vek)
Mic signal 8
a
ADDER
= C319
308
5 +) 50V1 25val
| | Svirarsssos svita7ssses_ PINK NOISE GENERATOR E[xf caw Lnat siti
eae ADDER / MIC AMP PINK NOISE OSC z sv K0.0056 $1.5K 15K
E | ral
©
= 10105 an
(0) G59 [2] = SVITA75559S BPE
=.
(6) =
c 3
R50 Ss R49 S6OK| ©
t )
G48 20N4 039 ko.o\68
4 1
x
ES by
2 x 3S
© +12
S$ SN =
a + 3
= :
8
3
= x xla a 3 s
gl ]z 5
elal sl | x 8
$
=
PS n32s 2 S $ x , C323 C310
SS s 2) c i = B 2 ny aPsov1 25V47
+ | wn 8 Q4 go °
; Few
~ |< | 2SA921
XS
x
Se ee Muting | 5 3] =
MOISE Woe age
aed 15k TORY
© m
9 ' o 8 2s ; 35s 0.0027 aea 1.5K 15K
pti (
en ie = 232 8
YF | Att date ede ele
&|§
8 | 0d8=->2008 S4-3 6356 8 b=
wn
1S9=4
$9-21 off<eon 0s
© Te ahr pink noise = 2502878 | tL
S$
mic attenu
POWER ON/OFF MUTING
TRY R977 R78,"
Vew2.2Kk 1/2W 2.2K v2W 1.8K 4
Se) Gee) Foe 43 = my aa | V4 ee pee ae a 7) a EY (EE =e [— (62)=e(43 (emt) 6) G7) G8} 34) G5) G6) G7) (8) (39 en 40 een | oma 24) (25 20m
7. aa ne ee eae gl)
7 Z hadtookoes' gqn> OMIT, = ° s ° ° ° 6! {OLi9 (22) (44) 5 4 een 47 8) 34) G5) 36 G7) G8) G9) (40 me 425 2
S$1-3 $2-5 S2-6 $3-5 $5-5 S$5-6 | (5k 40Hz 63Hz OOH | | (460Hz 250Hz S500Hz IKHz_] 2KHz 4KHz_J 8KHz_] |[16KHz] @
Display level control 66) 67) 65 5} Ls. se, ide ° esen. ees, shes | 3 per Woe =
7 an ae d] :
VRIWVR26
RaRERY 200KB vR1 VR3 VR5 } VRT VR? VRii a vaiz | vRis vr? | vate | vR21 | VR23 Z| vr
a LN81
DE1 we D553 en, D55e, D572, D5%ee Dole, Dose, Dbde, Dorey Db9e Die D3 4
source
Dii~i6 LN4IYCPH
& ®)-
o5|~74 LN25IRCPP
BAND LEVEL CONTROLS (L ch.)