Sansui 8900ZDB - Page 21

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99002Z/8900ZDB/79002
Fig. 2-3 UP/DOWN Pulse Generator Circuit
x Differentiation Circuit
fPH51
Output O
Pulse
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vl >?
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It}H] \C2a~d=fIC52
rare TC9140P
reel
-
FM—H
AM=L
® IC2d
Lor ehrt
IC2b Ls
Fig. 2-4 Timing Chart of UP/DOWN Pulse Generation
Hits
A)CLOCKWISE
TURN
OF
TUNING
KNOB
B)COUNTERCLOCKWISE
TURN
OF
TUNING
KNOB
:
POINT
(UP
Pulse
Generation)
(DOWN
Pulse
Generation)
REMARKS
ae
Se
ean
|
Oi
|
uc
tS]
tf
ne
EE
SU
[eal
(ee
F
®
|.
|
o
|
FM
Mode
Only
©
|
|
|
o
|
FM
Mode
Only
7
a
ae
ee
es
ee
;
TTT
@
Ah,
1
~t—
4-+-
\
iN
IN
@
—
|
h_,
—
;
V
7
—O
|
FM
Mode
Only
®
~
ae
r-—
=
a
A
A=,
FM
Mode
Only
©
Aes
wr
en
|
.
ie)
Output
Signal
for
DOWN
©
J
L
Lav
Tuning
on
AM
Mode
So
=
Output
Signal
for
UP
)
ae
0
Tuning
on
AM
Mode
a
Output
Signal
for
UP
nad
0
Tuning
on
FM
Mode
®
|
|
I
AV
Output
Signal
for
DOWN
———0
Tuning
on
FM
Mode