Fisher PH-DTA300M, Service Manual

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IC BLOCK DIAGRAM & DESCRIPTION
IC101 TA2104B (Tuner) IC501 TA8227P (Power Amp.)
IC151 TC9257F (Tuner PLL)
RF
GND
FM
RF OUT
FM
RF IN
RF
Vcc
AM
LOW
CUT
MIX
OUT
FM
OSC
AM
RF IN
AM
OSC
ST
LED
OSC
OUT
Vcc AM
IF IN
FM
IF IN
GND
IF
REQ
DEV
OUT
LPF1 AF IN LPF2
AGC QUAD R-OUT L-OUT
24 21 20 19 18 17 16 15 14 13 22 23
1 4 5 6 7 8 9 10 11 12 3 2
AM
OSC
FM
OSC
AM
MIX
LEVEL
DET
AM
DET
FM
DET
FM
MIX
AGC
BUFF
FMRF
BUFF
ST
1/8
SW
IF
BUFF
AF
BUFF
FMIF AMIF
AF IF
REQ
ST/MO
FM/AM
MJTE
VCO
DIVIDE
DECODE
2 MODULUS
PRESCALER
4bit SWALLOW
COUNTER
POWER ON
RESET
TRI-STATE
BUFFER
TRI-STATE
BUFFER
OUTPUT PORT
ADDRESS
DECODER
OSC
CIRCUIT
PHASE
COMP
ARA
T
OR
12bit PROGRAMMABLE COUNTER
20bit BINARY COUNTER
UNIVERSAL COUNTER CONTROL
REFERENCE COUNTER
24bit REGISTER
24bit SHIFT REGISTER
24bit REGISTER
MAX
1/ 2
UNLOCK
I/O POR
T
XT 20 DO2 1
XT 19 DO1 2
PERIOD 18 I/O-7/SC
IN
3
CLOCK 17 I/O-8/IF
IN1
4
DATA 16 I/O-9/IF IN2 5
OT-1 15 GND 6
OT-2 14 FM
IN
7
OT-3 13 AM
IN
8
12 9
11 10
OT-4 V
DD
I/O-5/CLK I/O-6
TC9257P, TC9257F
Top View
DIP-20PIN / SOP-20PIN
XT 16 DO2/OT-4 1
XT 15 DO1 2
PERIOD 14 I/O-5/IF
IN1
3
CLOCK 13 I/O-6/IF
IN2
4
DATA 12 GND 5
OT-1 11 6
OT-2 10 AM
IN
7
OT-3 9 V
DD
FM
IN
8
TC9256P, TC9256F
Top View
DIP-16PIN / SOP-16PIN
TEST
GATE
AMP
AMP
AMP
OT-4
OT-4
OT-1 OT-3
OT-2 OT-4
RESET
PSC
MODE LF FM
HF FM
H
FM
L
XT
1ms
1ms
OSC
4
8
24 22
10
5
5
4
4
15
12
4
DO1
I / O-5 / CLK
I / O-6
I / O-7 / SC
IN
DO2
(DO2 / OT-4)
I / O-9 / IF IN2
(I / O-6 / IF
IN2
)
I / O-8 / IF
IN1
(I / O-5 / IF
IN1
)
GND V
DD
FM
IN
AM
IN
XT
XT
DATA
CLOCK
PERIOD
(Note) Mark terminals are not existence in TC9256P, TC9256F.
Terminal name of TC9256P, TC9256F is shown in parentheses.
Others are common terminals.