Technics SL-6 - Block Diagram

m BLOCK DIAGRAM
¢ Description of each terminal of MN1425FPE
Pin "i
Symbol Description
No.| > P |
1.) VSS Ground terminal
2 cont Turntable speed select output terminal
(45 rpm at “H". 33 rpm at “L”.)
3 | CO10
4 |) Cog
5 | Cos
6 | CO7
7 Cco6 Program LED display output terminal
8 | COS (LED ON at “L")
9 | CO4
10 | CO3
11] CO2
12] CO1
| Repeat LED display output terminal
13
£00 (LED ON at “L")
14] Al3
15 | Al2 Key scan input terminal
16} AN (Each key is read in through key scan with E-port.)
17 | Alo
eh.
18 BI3 Rest position detection input terminal
("L" when tonearm is on rest.)
Blank groove detection and record detection
terminal [Blank groove detection pulse is active “L".
19} Bl2 When it is ‘'H” at start, 30cm record is detected.
When it is “L", it is judged that there is
no 30cm record (17cm or 25cm record is present)].
20; Bi Cueing time read input terminal.
Turntable speed select and cabinet opening/closing
21 BIO detection terminal.
(Each operation is done through key scan with
E-port.)
22; EOO
23 | EO1 Key scan output terminal
24 | £02 (Each key-is read in through key scan with A-port).
i 25 | E03
| 26] TST Test terminal (connected to Ground not used)
Reset terminal
(27) RST (The microcomputer is reset at “L", and is not
reset at “H".)
| Select terminal
28 SLCT | (The level is set to “H" by the select terminal
i of the inside counter.)
29 | SNSO | Offset angle detection signal input terminal
30 | SNSI Arm position detection signal input terminal
Turntable start/stop select terminal
31
poy (Start at “L", stop at “H".)
32 DOI
= ree Arm motor drive control terminal
35} DO4
—}
36 | DOS Muting controi terminal
| 37 i Dos Cueing control terminal
("H" during cueing and cueing down.)
Cueing contro! terminal
bo?
ee (*H” only during cueing down.)
39 | VOD Power supply terminal
| 40} Osc Oscillation terminal
aE SSS
Blank groove sensor
1C801
DC amp.
ICBOI (1/2)
VR9OI
Sensor
gain adj.
ALK.
AN6562
Synchro jack
Cueing plunger
12V
CUEING
CONTROL
CIRCUIT
5V
MUTING DRIVE CIRCUIT ,,,
Muting relay
l2v
a
Cueing down
“H” during cueing
and cueing dowun
“H” only during
cueing dowun
SV
r an A
ag
330
t
+ —-
y+
3319 41830845302
(S309) (S305)
YA yoy
($308) J(S304) (S311) [(S313)
HH Eo
7 eal eas
auto
(S307) g(S303)9(S312) g(S314)
Hv yf
of
vs ke Sale 4
as ie
Speed KEY MATRIX
selector CIRCUIT
1c802
AN6912
| 15~2.0
0.5
& VR902
°
and passicsol
filter sp {/2)
Sensor resolution adj.
5V ay
Cueing timer circuit
1C802 (1/4)
Slope circuit
BLANK GROOVE DETECTION CIRCUIT
Record size
detecton
(S601)
H: Muting “off”
L: Muting “on”
Switching e305
OFFSET
ERROR
ANGLE
DETECTION
CIRCUIT
SV lav
Vl
converter
Ieee ot
IC 802 (1/4)
adj.
14
Cc
parator
TH
g VR5OI
Gain
PCSOI
Y
Arm position
“| Offset angle
Df
l2ms
Waveform
shaping
l2Vv
circuit
IC 401 (1/72)
IC 401 (172)
1C401
AN6552 =
13
Turntable start/stop select f
Start at “H”
Stop at “L”
POWER
SUPPLY
CIRCUIT
AC Line u
Power
transformer
(S1)
ARM POSITION
'2¥ DETECTION CIRCUIT
12V
“| Arm position
* | sensor
eS
5V
Ol
ei
ICI
QI
.
* Arm motor control (D-port)
§
fOSNBINING», | 0-1 63 "fart 35
Stop H H Ls b |
L Forward L ; H L 4 {
t
L Reverss H | L Lu cy
Turntable
speed select
| y * D301~D310
Program indicator
| | D311
| Repeat indicator
ae SV
..
D3II
LED ON at “'L”
20ms 33rpm
3.0
24 XN
33rpm 20ms
V4 ; | | f pes
YFGOLE
[>
Schmit :
Two—phase
full—wave drive
circuit
rae
TURNTABLE DRIVE CIRCUIT
Hall element
position detector
(1201)
AN6552