Technics RS-B765 - Page 19

i e 1C551 (HD404302SA07): MICROCOMPUTER (This microcomputer is used for FL meter operation.)
Power supply terminal
aii Rec level control (VR MAX... +5¥V)
ew fo | Function key terminal
See aN RRND
(COUNTER RESET/COUNTER MODE/APRS)
f= [som
fz [am | — lomewom
fa [ee [1 [eerie
Ce
[oer Te
Clock OSC terminal (4MHz)
Segment signal for FL display
apo cro
Grid signal for FL display
iar feaner | ae Reel pulse signal of tape up reel
fe| nes | ot Reel pulse signal of supply reel
Memory pulse signal
(“L” for 50ms. with counter 0000”)
20} ose | Serial data signal (ACTIVE: “H”)
[= [ee [= [aeiemn
Segment signal for FL display
i
:
M@ BLOCK DIAGRAM
TEAO66S
Tea) (et
VRI-1, VRI-2
LINE i
iN = vRee heres DOLBY NR (B/C)
O—=>
Q401,
403
(Leh) (2402,404)
L405 (406)
vR2
(BALANCE)
[R ch ] {R ch J =>
ANT7351K
PLAYBACK EQ/MIC AMP/REC AMP Ao)
€8)
rc-7 J
! d
(41) ~
PLAYBACK 24, > Sit
HEAD i: § (40) © '
(UL ch) aval P.B AMP | Filter
t--- a. amp.
1
0
. VR3(VR4)
ar loon - PLAYBACK
\
GAIN
ADJ.
i]
oo! ay ee VR7 (VRB)
(32) t (REC
RECORD
sed
4
£
CALIBRATION)
(Lech) |
See
11,13, 15,17 )
(a12 14 16,18) /\
Tape selector
(Normal/Metal/Cr02)
oma BASz\e ¢®)
IEEE
10916
Ta)
ee
se
MOTOR DRIVE | 7
t?
Music v <q
selector (M) { |
9 3
EJECT $—<] +
MOTOR J
UPCI297CA
DOLBY HX PRO
(CHECKING THE
EFFECT OF BIAS
ADJ. VR)
3 7
Ye
VR301(VR302)
(OVERALL FREQ. ADJ.)
0907
$973
M52i8L (Cr02)
1€553(22)
fo)
so76
(Metal)
Bias ADv. VR303
L301
ERASE on a
HEAD
control
(BIAS CURRENT ADJ.)
Q301, 302,304
Bios OSC
control
CAPSTAN
0302 Y > MOTOR
BAG218
Tew 902
Peco DRIVE, cr
Q922
$80! L
(MOTOR) \ = 2 3,
HAIZ3440MPEL
MOTOR DIRECT DRIVE p21
cF2010
control
SN74LSO4MEL t-—
Pic202 My 1c203 |
SN74LS74AMEL