Hitachi D-900BS Service Manual page 21

SCHEMATIC DIAGRAM (CONTROL
SECTION)
ICr
tc2
HDT4IOP
HDT4OOP
|N/ERTER
RECMODE
Ft0t-0,
REC.SELECT
AMP ORCUT
(EOlr)
rc3
HD74@P
PI-AY/REC.
MEMORY
SIGNAL
GENERATION
oSt-Q56
zSC1740
EACH MOOE PULSE
GENERATION AND
PRIORITY ORDER
DECISION
IC4. lC5
HD74@P
INVERTER
Q58
?sct740
REC. RESET
SIGNAL
GENERATION
IC6
HDT4OOP
PAUSE
MODE
t-lol_o,
PLAY-
SIGNAL
GENERATION
lc7
H07400P
PLAY
I',ODE
HOLD
rJttEot
INVERTER
D69
-
D7t
tN60
BOOSTING
DISCHARGE
REMOTE
@NTROL
JACK
OPERATING
BUTTONS
r---l
PLAY
STOP
REC
053. D80
rN 60
RFÚERSE
CI'IRRENT
CHECK
s6
R54€
470
tc4-(D
rc.-@
055
rN60
BOOSTING
DISO{ARGE
rîT-l
ùlmry @nl.r
rwltch
(lurm
ON
wlth"999")
D8r
tN60
REVERSE
CURRENT
CHECK
Auft
ff.
o57
zSCt740
PAITSE RESET
SIGNAL
GENERATION
-2"1
-
t-
L-__
D83
wo6A
REVERSE
CURRENT
CHECK
082
wo6A
REVERSE
CURRENT
CHECK
2
sl
sl7
REC.PEVENTION
SIT
r---l
R549
470