Fisher MC-620 - Page 18

INTEGRATED CIRCUIT BLOCK DIAGRAM
FM FRONT ENDIC TA 7358AP
VOLTAGE
REGULATOR
CIRCUIT
AM/FM IF AMP & MPXIC LA 1810
ie I
| |
DETECTOR
Ey
iv a
i ae
CASSETTE DECK PLAY AMP IC LA 3246
IN2 IN2
FwO REV NF2
ME/NOR ME/NOR N/H FILTER
OUuT2 Sw QuT2 OUT RFC
y 7 eee
BUFFER LOocaL (8)
= | ater} -O
RF
Tu
; DRIVER
OUT! ME/NOR NOR/HIGH N/H
ouT! Sw OUT!
MIX FWD/REV
OUT sw
GND
==
REC/PLAY PREAMP IC BA 715
Vee Vout I1:
FEEDBACK? | =|
INt
Vee IN2 I1t2 Vout Vee
POWER AMPLIFIER IC LA 4261
INPUT! |»)
DECOUPLING
PRE-A.GND [2]
INPUT2
4
Ee
FEEDBACK2
PROTECTOR
[~
Vee ||
outpuTt [3|
OUTPUT2
POWER-A. GND [|
CPU PORT DESIGNATIONS (TSE 4039F-009)
GND
+6) test
i
cPY TIMING GENE La.
2Hz 10Hz 100H2 SOHZ SYSTEM RESET
2H2 F/F
a
MPX REFERENCE DIVIDER
DIVIDER
3) REF
UNLOCK
F/F
POWER ON RESET
TR. EVE 4 BIT SWALLOW
BUFFER COUNTER
PHASE Se 4
COMPARATOR 10 BIT PROGRAMABLE
COUNTER
TR.
BUFFER
PLL 170 PORTS
4 4
4
DATA BUS
CTODE BUST
4
cI COLUMN
ADDRESS: DECODER
ROM
(16x1024 STEP)
DETA REG. (16 BiT)
ADDRESS
DECODER
SOHZ 100HZ
STACK REG.
S10 CONT.
=
SFM IF IN/IN2
AM IF IN/INI
)P2-3/AM OUT
) P2-2/LW/Z OUT
=) P2-1/MONO OUT
INT
te TSE 4039F-009 OUTLINE
INA(vo0 2)
xT Es
S2QeE uw
O2r wi
x nolagkez
563390
pot Ssaa<c<teig
: tert
FM IN 333R588
INT (VoD2)
XT
XT
56
57 si
58 s2
59 $3
60 $4
P2-4/1F REQ.
Hr NOY WM
sig uaa TSE 4039F-009
P3-2/A/0
IN
2
nie
Top
View
Rs Or eer = mini FP 60pin
nooPrer ees
Key Timing Output
LCD Segment Output
T6
™
v4
3
T2
1
To
Key
25 Input
Atte 5) Mure out
Le DRIVER
K3 K2 K1 KO
Semper coccccmcrerrerts ret [Nea Pin | No. 42 Pin
ere = See ete ig T6; AM IF Counter FM IF Counter Stereo Ind. Output Auto Tuning Té6
AM Tuned IN FM Tuned IN Manual Only
IF Offset MW Step FM Step
T5) Upper +10.7MHz Signal Meter 10kHz 100kHz T5
Lower —10.7MHz y 9kHz 50KHZN
PORT ASSIGNMENT AM Band LW Band MW Band FM Band
Port | Pin No. Name Assignment Active | Initial 2 Band MW 153~360kHz 520~1710kHz 87.5~108MHz
MUTE 41 MUTE MUTE Output L T4 522~1629kHz T4
P2-1 aor MONO OUT | MONO Output L | H 3 Band MW/LW 153~281kHz 530~1600kHz 76.0~90.0MHz
P2-2 39 LW OUT | LW BAND Output L H 531~1602kHz
P2-3 38 | AM OUT | AM BAND Output L H Memory Scan AM FM T3
P2-4 37 IF REQ. IF REQ. Output H L INT Down Up T2
P3-1 36 DC REF. DC REF. Input * * M6 INT Auto/Manual
p3-2 | 36 | A/DIN | A/DConverterinput| * * [ Swreaienos()
AMIFIN| 43 AM IF IN. | AM IF Counter Input * * M3 M2 M1 |to0
FM IF IN ts. 47 FM IF IN FM IF Counter Input * * K2 K1 KO
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