DAEWOO ELECTRONICS AKD-0105 Series, Service Manual

Page: 37 / 59

35
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
53
54
55
PIN NAME
XIN
XOUT
EO1
EO2
EO3
VSS
VDD
FMIN
AMIN
SUBPD
HCTR
LCTR
SNS_
HOLD_
TEST1
TEST2
PK3
PK2
INT1
DESCRIPTION
CONNECTION TO 4.5 MHz CRYSTAL
OUTPUT COMPARED WITH 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)
--REFER TO ATTACHED PAGE.
POWER TERMINAL
INPUT TERMINAL IF FM VCO(LOCAL OSCILLATION)
INPUT RANGE:
INPUT TERMINAL IF AM VCO(LOCAL OSCILLATION)
INPUT RANGE:
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 : 107MHz + 30kHz, Vpp=
INPUT TERMINAL OF AM IF COUNT
INPUT RANGE : 450kHz + 1kHz (AM)
: 450kHz + 0.37kHz (LW)
Vpp=
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.
I/O
I
O
O
O
O
I
I
O
I
I
I
I
-
-
I
I
I
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