Denon AVC-1880, Service Manual

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14
14 AVR-1804/884 / AVC-1880
Function
Pin
No.
Pin Name I/O
* For latch-up countermeasure, perform each power supply ON/OFF in the same timing.
28 XOUT O X’tal osc. connecting output terminal
29 XIN I X’tal osc. connection, external clock input terminal (24.576MHz or 12.288MHz)
30 DVDD — Digital power
31 DGND — Digital GND
32 EMPHA/UO I/O Emphasis information/U-data output/Chip address setting terminal
33 AUDIO/VO I/O Non-PCM detect/V-flag output/ Chip address setting terminal
34 CKST I/O Clock switch transition period output/Demodulation master or slave function switching terminal
35 INT I/O Interrupt output for
µ
com (Interrupt factor selectable)/Modulation or general I/O switching terminal
36 RERR O PLL lock error, data error flag output
37 DO O
µ
com I/F, read out data output terminal (3-state)
38 DI I
5
µ
com I/F, write data input terminal
39 CE I
5
µ
com I/F, chip enable input terminal
40 CL I
5
µ
com I/F, clock input terminal
41 XMODE I
5
System reset input terminal
42 DGND — Digital GND
43 DVDD — Digital power
44 TMCK/PIO0 I/O 256fs system clock input for modulation/General I/O in/output terminal
45 TBCK/PIO1 I/O 64fs bit clock input for modulation/General I/O in/output terminal
46 TLRCK/PIO2 I/O fs clock input for modulation/General I/O in/output terminal
47 TDATA/PIO3 I/O Serial audio data input for modulation/General I/O in/output terminal
48 TXO/PIOEN O/I Modulation data output/ General I/O enable input terminal
LA1266 (IC402)
10
4
1 3
8
19
15
17
18
14
21
22
GND
Vcc
5
11
IF
BUFFER
IF
BUFFER
2
FM - IF
6
Q.D.
7
REG
23
OSC
OSC
BUFFER
24
NARROW
S-METER
S-METER
16
LED
DRIVER
RF MIX
12
20
AM-IF DET
AGC
POST
AMP
9
13
AM-IF FM-IF FM-IN
AM-IN
20 19 18 17 16 15 14
13
12
9
8
7 5
6 1
21
LA3401 (IC403)
22
VOL
REG
OSC
SYMMETRICAL
REOCTANCE
CIRCUIT
PHASE
COMPARATOR
VCO STOP
PILOT DET
FF
FF
38kHz
FF
38kHz 90°
FF
19kHz 90°
MUTING
FM AM CHANGE
Ro
Rc
Rc Rb
2 3 4
DECODER
MUTING CONTROL
FM AM CHANGE OVER
Vcc ON
MUTING
MUTING
OUTPUT
STEREO
SWITCH
TRIGGER
LAMP
DRIVER
Rb
10 11
LC72131 (IC401)
1
20
2 19
3
18
4 17
5 16
6
15
7 14
8
13
9 12
10
11
XIN
CE
DI
CL
DO
BO1
BO2
BO3
BO4
IO1
AOUT
AIN
PD
VDD
FMIN
AMIN
IO2
IFIN
Vss
XOUT
1 24
12 13
FF