Control Stage; System Diagram Of Control Section - Pioneer SX-7 Service Manual

Gontrol Stage
The incorporation of microcomputers in these
receivers has further
simplified operational
procedures. The PD6007 (SX-7) and PD6004
(SX-6, SX-5 and SX-4) ICs are both basically the
same 4-bit microcomputer (with 2k-bit memory
capacity), the main difference lying in the software
program. Whereas the PD6007 incorporates a clock
function, the PD6004 features a 2 band (LW/MW)
AM tuner switching function.
The PD6007 and PD6004 pin configurations are
shown in Fig. 1-3.
E X l o l
X l o l
REEEi
t R o
so
s l
scz ro
T'
r o
P r
P 2
P r
O o
O l
O z
U 3
O 5
O 6
V 3 s
KI
K 2
K l
K O
STBY
F i a
R r 5
R r 2
H t l
R t o
R e
R E
R7
R 6
d 5
R4
R 5
R 2
R r
RO
Fig. 1-3
Pin configuration of PD6007 (PD6004)
iSET
rRo
SF
5 U
fp"
I
I P .
I
l " '
LPo
l-xo
I
l * '
l * '
LKo
T C
Rl3
R t 2
[-n,r
I
I
R'o
1 ""
L R e
t l-nz
I
LR6
R 5
R.
AF MUTE IND R3
VOL. MEMORY R2
VOL. lND. R r
f"o
VOL. OATA I ^-
o u r P U T | " '
l o "
l o o
Lo.
fo.
D A r A l ^ -
our PUT | "'
l o '
Loo
EXTAL
CLOCK INPUT
KEY INPUT
CLOCK INPUT
(5OOHz)
SCAN STOP
MUTING OtIT
P . O . D A T A /
o)4.,,
INPIJT
5-TH
DIGIT
o o R 5
ol
_ _
M54s22P
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|
5""i'-
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AJ
cPs RE.ET
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c4 Fil
C 3 A M
c2 PHOilO
C { A'XIVID€O
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FUIICTION
SELECTfi IC
1 0
Fig. 1-4
System diagram of control section (SX-7)