Sony ICF-M1000 Service Manual page 16

ICF-M1000
• IC Block Diagrams
– MAIN Board –
IC1 CXA1238S
28
30 29 27 26 25 24 23 22 21 20
FM FRONT-END
AM FRONT-END
REGULATOR
MPX
VCO REGULATOR
1/2
PD1
COUNTER
1/2
PD2
COUNTER
AUTO
BLEND
MONO/STEREO
MUTING
SELECT
DECORD RIPPLE
AMP FILTER
1 2 3 4 5 6 7
– AMPLIFIER Board –
IC303 BA5417
T.S.D.
+ +
– –
STANDBY
BS FILTER
BS
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
ICF-M1000
19 18 17 16
FM IF/
DISCRI
AM IF/
DET
TUNING
INDICATOR
BAND-PASS
MUTE
8 9 10 11 12 13 14 15
– VOL Board –
IC402 TC7W74FU
8 7 6 5
S R Q
C D Q
1 2 3 4
• IC Pin Function Description
MAIN BOARD IC401 uPD17072GB-578-1A7-A (SYSTEM CONTROLLER)
Pin No. Pin Name I/O
1, 2
NC O Not used
Connection terminal of external capacitor for headphone
3
HP O
"L": radio off or speaker output, "H": headphone output
Connection terminal of external capacitor for speaker
4 SP O
"L": radio off or headphone output, "H": speaker output
5, 6 NC O Not used
7 9V ON O Power amplifier on/off control signal output terminal "H": amplifier on
8
5V ON O Power on/off control signal output terminal Not used
9 LINE O Mode selection signal output terminal "L": radio mode, "H": line mode
10
BAND/CLOCK I BAND/CLOCK key input terminal
11 POWER I POWER key input terminal
12 RADIO/LINE I RADIO/LINE key input terminal
13
TEST MODE I Test mode setting terminal
14 SP/HP I Speaker/headphone selection signal input terminal "L": headphone, "H": speaker
15
BAND O Band selection signal output terminal "L": FM or line mode, "H": AM
16 MUTE O Muting on/off control signal output terminal "L": muting on
17 RADIO O Radio on/off control signal output terminal "H": radio on
18
GND - Ground terminal
19 EO O PLL frequency synthesizer charge pump output terminal
20 VCOL I AM VCO input terminal
21 VCOH I
FM VCO input terminal
22 REG0 O Voltage regulator output terminal for the PLL
23
VDD - Power supply terminal (+3V)
24 XOUT O System clock output terminal (75 kHz)
25 XIN I System clock input terminal (75 kHz)
26
REG1 O Voltage regulator output terminal for the oscillator circuit
27 REGLCD0 - Connection terminal of doubler circuit capacitor for liquid crystal display drive power supply
28 CAPLCD0 - Connection terminal of doubler circuit capacitor
29
CAPLCD1 - Connection terminal of doubler circuit capacitor
30 REGLCD1 - Connection terminal of doubler circuit capacitor for liquid crystal display drive power supply
31 to 34 COM0 to COM3 O
Common drive signal output to the liquid crystal display
35 to 39 NC O Not used
40 to 49 LCD0 to LCD9 O Segment drive signal output to the liquid crystal display
50
CE I Power failure detection signal input terminal
51 ENCODER-CLOCK I Serial data transfer clock signal input from the rotary encoder (TUNE/TIME SET)
52
BEEP O Beep sound output terminal
53 I Serial data input from the rotary encoder (TUNE/TIME SET)
ENCODER-DATA
INITIAL IN (1),
54, 55 I Destination setting terminal
INITIAL IN (2)
56
INITIAL OUT O Output terminal for the destination setting
16 16
Description