Denon D-A03 Service Manual page 44

LA1844 (IC402)
24
TOP
VIEW
1
LA1844 Terminal Function
Pin No. Function
1 FM IF input
2 AM MIX output
3 REG
4 AM IF input
5 GND
6 Tu-LED
7 ST-LED, IF-out for AM stereo
8 FM-DET
9 Vcc
10 AM/FM IF count out, control SW, mute SW
11 Phase comparator filter, FM/AM switch
12 Pilot detector filter, forcible mono, Vcc stop 4.14 (2.60)
LC75811W (IC501)
60
COM6 61
COM5
COM4
COM3
COM2
COM1
V
DD
VLCD
VLCD1
70
TOP VIEW
VLCD3
V
SS
OSCO
OSCI
RES
CE
CL
DI
S1
S2
80
1 10
24 23 22
AL
AM AM
OS MI
BUFF
13
LEVEL
DET
S-CURVE
FM
FM
IF
12
DE
RE
2
1 3
Voltage
(V)
2.34
5.14
2.33
2.32
0



5.15
0
4.06 (1.56)
50 41
S42
40
S41
S40
S39
S38
S37
S36
S35
S34
S33
S32
30
S31
S30
S29
S28
S27
S26
S25
S24
S23
21
20
21 20 19 18 17
AM
RF. AM
AG
P-
AM
AM
φ
DE
IF
AM/FM
COMP
IF
TUNING
DRIVE
GN
5
4 6 7 8
Pin No. Function
13 L output
14 R output
15 Pilot cancel output
16 Decoder input
17 PLL input
18 FM demodulator output
19 AM detector output
20 S-meter, AM AGC
21 AM RF-IN
22 AFC
23 OSC
24 OSC buffer, FM SD adjust
* Normally at FM (at AM)
LC75811W Terminal Function
Pin No. I/O
1~56 O Segment driver output
57 O Segment driver output
58 O Segment driver output
59~66 O Common driver output

67 Power supply for logic block

68 Power supply for LCD
69 I For LCD drive bias 3/4V external apply
70 I For LCD drive bias 2/4V external apply
71 I For LCD drive bias 1/4V external apply

72 Power supply pin
73 O Pin for oscillator
74 I Pin for oscillator
75 I Reset signal input
Input for serial data transfer
76 I
CE: Chip enable, CL: Sync clock, DI: Transfer data
Input for serial data transfer
77 I
CE: Chip enable, CL: Sync clock, DI: Transfer data
Input for serial data transfer
78 I
CE: Chip enable, CL: Sync clock, DI: Transfer data
79, 80 O Segment driver output
16 15 14 13
DECODER
PILOT
ANTI-BIRDIE
CANCEL
STEREO
FF
FF π FF
VCO PILOT
38K ∠ ∠
304kHz 0
19K 19K
2
Vc
9
10 11 12
Voltage
(V)
3.17
3.17
2.27
2.33
2.08
2.83
(1.6)
1.1
2.6
2.55
5.17
3.16
Function
D-A03
44