Technics RS-B555

¢ 1C551 (HD404302SA07): MICROCOMPUTER (This microcomputer is used for FL meter operation.)
re | Mt fo] Feet
Division
fa [xe |= [Reeeren
f= [wm [1 sitcom sem
| FIN a Function key terminal
(COUNTER RESET/COUNTER MODE/APRS)
fap [a [sone
f= [sen | [roves
EA ee
} 28 | reser | 1 | Reset terminal (with Reset: “H”)
EI TEST a Test terminal
OSC 1
co
fe | we [fem
Clock OSC terminal (4MHz)
Segment signal for FL display
Grid signal for FL display
faz] oper ot Reel pulse signal of tape up reel
fe} aps | 1 | Reel pulse signal of supply ree!
Memory pulse signal
(“L” for 50ms. with counter “0000”)
20} ose | 1 | Serial data signal (ACTIVE: “H”)
Segment signal for FL display
M@ BLOCK DIAGRAM
07(Q8)
@ >
Switching
T
(Rec:
ON)
@5(06)
AN735IK
( Jindicates pin No.
PLAYBACK EQ/MIC AMP/REC AMP °f Tight channel.
altaQ 2)
Switching
rp Hean—— § (Play:ON)
{Leh}
VRI
(REC
Q4o1,
(2402,
MP.
Cont
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i VCA
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t Op ozo LTS 11 faery} #5 ae
4
I | LineRB] |
| 1 mute |
AC BIAS TRAP ADu. 03104) | poccccccn ms — <
LE(L2)
22
Y
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a
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+
<=
4
oto
GAIN
ADJ.
tea
O11,13,17
(912 ,14,18)
D9IT L\
Comparator
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ERASE
HEAD %
Lt
WA -——C8)
VR301(VR302) cB)
OVERALL FREQ. ADJ.
+—
L30l
Bios OSC
control
Q301,302
= D906
CAPSTAN
0302 Y, fw MOTOR
0907
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1C553(24) (CrO2) (Metal)
Q305,306 tot
Bias ADJ. VR303
control BIAS CURRENT ADJ.
ago
de
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Selector S/p702
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MOTOR DIRECT DRIVE 42,
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