Hitachi D-900 Serviceanleitung Seite 23

D-900 D-900
BLOCK DIAGRAM (AMP. SECTION)
HPS
RECORD LEVEL
=
MIC/DIN(C, AU)
~~
SIGNAL
FLOW
MIC(BS, FS: W)
ON IC2
———— MUTING)
KS HAII226
.
(
ICIL:R
Q3LR
REC. DOLBY NR
RVSLR Q7L-R
HAIZO6
2SC458LG
2SCI740S
MIC/DIN AMP. RV2-—
LINE AMP.
I9KHZ TRAP
(4X2) ara
ae |
REC. EQ.
aioe
-
orb
dA AY
A elea ier
Atay
—
SIGNAL =3Et AW 2-3) > > tet —
— B (2) aa E
1 Sk (8) ap; eet
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D
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0
]
|
ie
7 = EDIT STOP _
iO
+B
RECORD LEVEL
S|
|
2SC1162
Q4LR LINE (C, AU)
|
BIAS OSC.
(C,AU
ah
LINE/DIN(BS, FS, W)
a |
Vas.
aS
x
J4
©
|
OCCS TEST
(BS,FS,W)
JICR oF
ea
ol +
Oe ae |
eee
979
(e) 4
;
<I ogc
F
2 VOLT. sTaB.|
| loocey ne
INS4A
RT2L-R
OFF
Q2LR
| QIL:R
DCCs
| OFF
RECT FOR
:
2SC458LG
=~ las 2SC458LG
DOLBY NR Yi
LINE AMP.
|
A a6L:R
fe ee ee
f
2SCI740
DOLBY NR SWITCHING
pe ed
D4: 5-3
;
IS2473HC
Taiaoe
: Beye
a eHING REVERSE CURRENT CHECK
rod
LR
[~~
"1 A PLAY Dovey a
DIN MONITOR(BS,FSW)
gig. 2504688
.
6) J3LR
Q74: 2SC1740 ——_—-
p—
res, SE
aE,
PLAY SIGNAL
eam == (7 zhe
SBI TT Osanna
ar oe
| BIAS SWITCHING
APPROX. 3SEC.
|
: AFTER POWER
RV4
Oo O—0 U4
S7
:
OUT PUT
| A OUTPUT SW
io
.
ep
(BS, FS,W)
a
QISLR
(>
iS 2473HC
PLAY SIGNAL Q71.
pee
Ne
COUNTER
QiI7L:R- s y
PLAY EQ.
~
!
|
ELECTROMOTIVE
REC. PLAY SIGNAL
2SD 467BC
L-R
\\
FORCE CHECK
MUTING crop PAUSE)
IS2473HC
A
=
4——2 J5
Qs
:
rs
|
=
2SCI740
+8
INSSA
id
es : |
DIN OUTPUT
RECT FOR DOLBY NR
eScTAG
Bona
Sean
S2
MUTING
|
HEADPHONE AMP.
S|
aes
RT@L-R
ee LON.
ore oi
KB265
=) Iq Of>-o
be CU)
hy, 'p30
DI4 Pie |
oe
KB265
Q21-22
es He
QI4L:R_ D9-IOLR
a
QI2L: R- 2sci740
FOR "TAPE" "SOURCE"
Oras oS heres
(2X6 al NUM 4558
5V
SWITCHING
FLASHING
al
Tl
DIS
-Q26: 25cI1061
WER
DI7 - HzI5 ZRT7LR PO
D2I"'source"
) TRANSFORMER
POWER RECT,
VOLT. STAB.
fazt faze
laze Y) Y) 024
|
aoe "a: "REC at
= Cy e T ) ome
Pr D20 METER
'ay,
Q24
€ :
as
D22 2SCI740 OUTPUT
Q20 "PLAY" D23°24, SWITCHING
2SC1740
D24(LIGHTS IN REC)
AC POWER
| Bua
}a20
STOP OSC jazs |
: inne
(3) D27 (— "TAPE" LIGHTS OUT
Weel WO6A ~<a', WITH STOP REC SIGNAL
(3) POWER : POWER |
CASSETTE
(3) RECT.
Q25: 2Sa673. +=RECT.
Q27
CONTROL CIRCUIT |
CIRCUIT
ILLUMINATION
018: HZI5
2SCI740S SUES
LEVEL METER VOLT.STAB
|
PLAY SIGNAL MUTIN
ILLUMINATION
PLAY SIGNAL WITH PAUSE
|