3. GX-FSl  AUTO  TUNING FUNCTION DIAGRAM 
1-10 
TO 
DOLBY 
OUT 
(Leh) 
TO 
REC 
AMP 
( 
Leh) 
TO 
DOLBY 
OUT 
{R 
ch) 
TO 
REC 
AMP 
(Rehl 
MECHA 
CONTROL 
SIGNAL 
-7,5V 
.. 
L 
L 
.. 
L 
NO 
8.2K 
H 
L 
L 
" 
... 
V 
:  STOP 
OPERATION 
L 
H 
L 
FF 
MECHA 
STOP 
SYSCON 
+5V 
Rl5 
2.4K 
~---------READY 
IND 
'--------------~ 
IRQ 
~So 
47K 
~ 
SI 
R 
15 
l'.'ITl-------___:R::_:E::::A:.:D:..:.Y...!.IN'.!cO~------------.....J 
r' 
REFERENCE 
IND 
47K 
(LSB) 
~ 
LEVEL 
DATA 
'r SC/TO  [  Rl4 
---1--~ 
~TC 
BIAS  Rl3 
'f'  DATA 
__ 
,.._.......,.w,,...-+----,1---<t 
LS 
8  ( I  l 
MSB 
(DD 
47K 
(ll) 
47K 
47K 
c_..-.,_ 
'10 
P1 
LEVEL  L  H  L  H  METAL DETECT 
DATA 
47K 
9 
Pol 
R
121341
-+N-O_R_M....:A::...::..::Lc...:..=..:...C_r_0_2 
__ 
M_E_T_A_L_--1...,...-----Y'lr-----------------i--.i 
L L  H  H 
P2 
CrO2  DETECT 
R5 
300K 
+7.5V 
(MSB) 
LEVEL 
DATA 
r1 
tp3 
H 
H 
L 
1  H  I  L 
~ 
I 
ILSBUl 
'yOo 
I  I 
!  L  I  H 
~ 
I  I  (Ill 
'y0
1 
I  I 
H  I  H  I 
Htm 
L 
L 
R7 
RWD 
I  I  I 
15 
02 
1REC 
1REC  I  PLAY 
/ PLAY  /PAUSE 
$03 
TEST 
IND
◄
•---------~04 
NORMAL 
IND
◄
•t------~05 
CrO2 
IND
◄ 
.. 
-------~Os 
METAL 
IND
◄
•------$07 
RI 
r---dovcc 
01s!~fRGE 
Ro 
2 
J,,: 
L.__~GNAL_....J 
, 
MB8843 
TO 
PRE 
AMP 
( MUTE  SIGNAL  OUTPUT 
IN 
TEST 
MODE) 
RS 
3,3M 
COUNTER  PULSE  TPi 
+7.5V 
TP2 
----'-..W..-(1 
... 
~ 
+7.5V 
I 
... 
~ 
I 
-7.5V 
... 
IOOK  IOOK 
I0K 
FOR 
BIAS 
OSC 
f 
PB 
OUT 
(Reh) 
I/ 
KB 
, 
Fig. 5