Daewoo AKF-8825 series, Service Manual

Page: 34 / 46

32
FUNCTION OF MICOM IC
10-2. PIN DESCRIPTION
PIN
1
80
78
77
71
76
73
31
75
74
72
70
69
68
67
79
2
52
53
54
55
PIN NAME
XIN
Connection to 4.5MHz CRYSTAL
Output compared sith phase
IF LOCAL OSCILLATION FREQUENCY IS HIGHER THAN STANDARD
FREQUENCY.
OUTPUT IS HIGH, IF NOT OUTPUT IS LOW, AND IF SAME OUTPUT
IS HIGH-Z.
OUTPUT TERMINAL FOR AM 2ND CHANGE PUMP.
(IF STANDARD FREQUENCY OF AM IS 90kHZ)
POWER TERMINAL (VDD is to MAX 6.5V)
INPUT TERMINAL IF FM VCO(LOCAL OSCILLATION)
*
INPUT RANGE : 0.07~1.5Vrms
OUTPUT OF PLL LOCK UP SUB FOR SPEEDY PLL LOCK.
REFER TO ATTACHED PAGE ABOUT CIRCUIT USED.
INPUT TERMINAL OF FM IF COUNT
*
INPUT RANGE : 10.7MHz + 30kHz, Vpp = 0.07~1.5Vrms
INPUT TERMINAL OF AM IF COUNT
INPUT RANGE : 1kHz (AM)
: 0.37kHz (LW)
Vpp = 0.07~1.5Vrms
PART THAT CHECKS DAMAGE OF BACK-UP MEMORY AFTER
COMING BACK TO (BACK-UP)MODE.
REFER TO ATTACHED PAGE ABOUT CIRCUIT USED.
CONTROL TERMINAL OF BACK UP MODE.
IF INPUT IS HIGH, WORKING IS NORMAL.
IF INPUT IS LOW, IT REVERTS TO BACK UP MODE.
IF INPUT OF (ACC)IN IS LOW ACCORDING TO CLOCK OPTION
CLOCK IS DISPLAYED.
TEST PORT (CONNECTED TO GROUND)
RECEIVING RDS DATA FROM RDS DEMODULATOR IC.
REFER TO ATTACHED PAGE ABOUT DATA TIMING CHART.
INPUT TERMINAL IF AM VCO(LOCAL OSCILLATION)
*
INPUT RANGE : 0.07~1.5Vrms
XOUT
EO1
EO2
E03
VSS
VDD
VDD
FMIN
AMIN
SUBPD
HCTR
LCTR
SNS_
HOLD_
TEST1
TEST2
PL0
PK3
PK2
INT1
DESCRIPTION I/O
I
O
O
O
O
--
--
--
I
I
O
I
I
I
I
--
--
I
O
O
O