AIWA FRA125
Manual de Servicio

IC BLOCK DIAGRAM-1/1 IC, KA22426D
GND AF OUT VCC RIPPLE FILTER AF IN DET OUT AFC AGC AFC AGC IF GND METER NC FM IF IN AM IF IN FM/AM BAND SELECT

27

26

25

24

23

22

21

20

19

18

17

16

15

14

AM IF AGC AF POWER AMP AM FE
FM DISCRIMINATOR

TUNING METER

FM IF

FM FE

1
MUTE

2
FM DISCRI

3
NF

4
VOL

5
AM OSC

6
AFC

7
FM OSC

8
REG OUT

9
FM RF

10
AM RF IN

11
NC

12
FM RF IN

13
FE RF IN

14
FM/AM FE OUT

IC, LM8562
MODE SELECT SPEED/ POWER DOWN CR OSC 50/60Hz INPUT T 50/60 SEL 12/24 SEL T

TEST POWER DOWN TONE1 TONE2 INNER OSC 1/25 or 1/30 2Hz TIME SET STANDBY DET SEC CTR RESET SET CK U/D RESET SYSTEM CLOCKS 1/2 RESET 1Hz

OSC OSC STOP GATE

CTR

CONTROL

GATE

PF. DET

BLANK FLASH

TONE1

OSC STOP

GATE

RT-TIME SET/ DIMMER

DIMMER T RT-SET

TIME CTR COMPARATOR

SEC TIME

TIME SET INPUT

SETCK S T U/D S 2Hz

RESET

SET CK U/D RESET RESET S SEO DISP T.DISP AL1.DISP AL2.DISP SL.DISP RESET SET CK U/D RESET

ALARM1 CTR

ALARM1

PWR UP

ALARM2 CTR

ALARM2 SLEEP

T T

CONTROL

ALM-DISP SELECT SLEEP/ SNOOZE

SLEEP CTR

SNOOZE CTR

OUTPUT DECODER/DRIVER

CONTROL

CONTROL

ON ON/OFF INPUT T OFF T THREE INPUT CIRCUIT OUTPUT CONTROL

ALM1-OUTPUT ALM2-OUTPUT RADIO-OUTPUT

IC, LM8560N
12/24 SELECT 50/60 SELECT 1Hz CR INPUT 50/60 INPUT OSC CTR TONE STANDBY DET T.DISP & S.SAMPLE 50/60Hz
INPUT CONTROL

TONE2

50/60Hz

GATE

1/25 or 1/30 50/60Hz 2Hz

1/2 PF. DET BLANK & FLASH

SEC CTR S.SAMPLE F.SAMPLE TIME MIN CTR TIME & F.SAMPLE

GATE

MIN SET HOUR SET

D D

2Hz TIME & S.SAMPLE SEC RSTYHLD
PWR UP

TIME HR CTR

SEC

T.RST AL.RST PWR UP

COMPARATOR TIME SEGMENT OUTPUTS
OUTPUT DECODER/DRIVER

ALARM DISPLAY

D
DISPLAY RESET CONTROL DISPLAY INPUT

ALARM MIN CTR SEC DISP T.DISP AL..DISP SL.DISP CONTROL TIME & F.SAMPLE ALARM & F.SAMPLE SLEEP CTR

ALARM HR CTR

ALARM

SEC DISPLAY SLEEP INPUT D

SLEEP PWR UP

SNOOZE INPUT ALARM OFF

D D

OUTPUT CONTROL

SLEEP OUTPUT ALARM OUTPUT

TONE

-16-

SEGMENT OUTPUTS