Yamaha AS2000BL Service Manual page 64

A B C
A-S2000
FRONT 1/3
1
POINT A-1 XL501 (Pin 23 of IC502) POINT A-2 A-3 1 / Pin 1, 2 / Pin 3 of CB501
CB501 +5M 1
CB501 /RES 2
2
POWER ON POWER OFF
3
IC501
0.2 5.1
4.3
1.3
2.1 1.3
2.5 2.5
2.6 2.6
0 2.5
0 2.5
0 2.5
1
CB501
4 A-2 A-3
2
12.1 5.0
5.6
Page 62 C5
5.6
to FUNCTION (3)_W1
0
5
5.8 5.1
IC505
5.8 5.8 5.0
8.7
0
5.8
6
7
FRONT (2)
SPEAKERS
OFF
A
8
B
A+B
TRIM
-6
0
+6
+12
-11.8
JK501
9
-11.8
JK501
10
# All voltages are measured with a 10MΩ/V DC electronic voltmeter.
# Components having special characteristics are marked s and must be replaced
with parts having specifications equal to those originally installed.
# Schematic diagram is subject to change without notice.
64
D E F
Writing port
1
2
POWER ON
0 0
0
0
0
1.0
0.7 0
0.7 0
MICRO
0.7 2.1
0.7 1.6
0 4.8
PROCESSOR
5.0 2.5
1.4 2.5
IC502
0
2.5
0 0.2
0 5.0
0.2 4.1
0
0
A-1
5.0 0
0 0
4.9 0
0 0
0 0
5.1
4.3
4.4
5.1
3.6
11.9
0
0
0
5.0
0
CB503 W5002
12.1
CB524
CB525
CB504
G H
0.1
4.6
0
IC504
12.0
12.0 12.0
12.0
11.9
0
0
0
5.0 11.8
-11.8 11.9 5.0
0
0 0
0
12.0
12.0 12.0
12.0 12.0
11.9
11.9
11.9 11.9 -11.9
-11.9 -11.9
12.0 0 0 11.9
0 -11.8 0
0
0
0
0 0
0
5.3
5.7
5.7
5.0 5.3
5.3
5.0
-11.8
5.3
5.0
-11.8
5.3
5.0
-11.8
I J K
FRONT (9)
CB507 W5004
1.9
0.1
INPUT indicator
CD TUNER LINE 1 LINE 2 CD BAL PHONO MAIN AUDIO
W5006
CB509 DIRECT MUTE
5.0 5.0 5.0 5.0 5.0 5.0 5.0 5.0
3.2 5.0 5.0 5.0 5.0 5.0 5.0 5.0
IC503
FRONT (6)
FRONT (3)
W5003A W5003B
W5005A W5005B
CB512
W5008
INPUT
SELECTOR
W5009A
W5009B
AUDIO MUTE
W5007A
W5007B
PHONO MM/MC
TREBLE BASS BALANCE
+/- +/- L/R FRONT (8)
CB517
0
5.0
Page 61 J6
0
to FUNCTION (2)_W4004
CB519
12.0 12.0
Page 60 K8
-11.9 11.9 -11.9
0
to FUNCTION (1)_W3004
0
CB521
Page 63 K6
to MAIN (2)_W203
IC502: M38039xxxxx
Single chip 8-bit microprocessor
Main Main
clock clock Sub-clock
input output input
X X X
IN OUT CIN
30 31 28
Clock generating circuit
FRONT (1)
A/D
converter
(10)
P6 (8)
2 3
4 5 6 7 8 9 10 11
V REF AV SS
I/O port P6
L M N
FRONT (4)
VOLUME
FRONT (5)
IC501 TC74HC4051AFEL
8-channel analog multiplexer/demultiplexer
COM
OUT C IN 0
4 1 16 Vcc
A 1
2 6 2 15 2
COM 3 14 1
3
B
7 4 13 0
FRONT (7) 4
5 5 12 3
5
C INH 6 11 A
6
V EE 7 10 B
C IN
INH OUT 7 GND 8 9 C
IC503: LB1641
Motor driver
3 2 8 10 9 7
4 VZ
IN 1 5 INPUT LOGIC
6 IN 2
GND 1
IC504: LC709004A-TLM-E
I/O-expander for microcontroller
DIN 2 Serial/parallel converter/shift register 14 DOUT
IC505: RH5RE58AA-T1-FA
CLK# 15 VDD
3 Voltage regulator
19 VSS
CS# 4
V IN V OUT
2
3
RES# 21 I/O control/output register
+
–
port 0 I/O buffer port 1 I/O buffer
Vref
1
GND
24 17 15 8
Sub-clock
output Reset input
X V V RESET CNV
COUT SS CC SS
29 32 1 27 26
Data bus
MICROPROCESSOR
RAM ROM A Timer 1 (8)
X
Prescaler 12 (8) Timer 2 (8)
Y
Timer X (8)
Prescaler X (8)
S
CNTR
0
PC H PC L Prescaler Y (8) Timer Y (8)
CNTR 1
PS
Timer Z (16)
CNTR 2
D/A D/A
PWM SI/O2 SI/O1 SI/O3
converter converter
(8) (8) (8) (8)
2 (8) 1 (8)
INT 00
INT 01
INT 1
INT 3 INT INT 41
2
P5 (8) P4 (8) INT P3 (8) P2 (8) P1 (8) P0 (8)
40
12 13 14 15 16 17 18 19 20 21 22 23 24 25 28 29 57 58 59 60 61 62 63 64 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56
I/O port P5 I/O port P4 I/O port P3 I/O port P2 I/O port P1 I/O port P0
(LED drive)