Yamaha DSP-A5 Service Manual page 43

A B
DSP-A5
SCHEMATIC DIAGRAM [DSP]
TO INPUT(4) #1
page E-49/J-47 E-4
1
IC2 : HD74HC02FPEL
Quad 2-Input NOR
DIGITAL
IN
2
4.8
14
0. 1 4.8
11
13 5 8
0 4.8 0
8 12 0
7
7
6
9 4.8 0.1
10 0
0 4
2.2
0
0 0
3
0
0
2
0
0
0 0
5 2
3
4 1
6 3
4.8 4.8
0 0
DIGITAL FORMAT INTERFACE RECEIVER
(DIR5)
4
5
5
Point
5
Pin 9 of IC3
V : 2V/div H : 50nsec/div
DC range 1 : 1 probe
0V
2V SAMPLE 50ns
6
7
TO INPUT(1) #3 page E-48/J-46 G-8
8
PIN CONNECTION DIAGRAM OF DIODES, TRANSISTORS AND IC's.
1SS355 UPC29M33T-E1 NJM2904M
2SC3326(A,B)
DTA144EKA uPC4570G2
DTC144EKA
Anode
Cathode
E-51/J-49
C D E
IC1 : NJM2904M
14 13 12 11 10 9 8
A OUT
IC8~13 : uPC4570G2
Dual OP-Amp
A –IN
A +IN
V–
1 2 3 4 5 6 7
1
0
3 .2
2 .4
0 DSP + AC-3/PRO-LOGIC/DTS
0
0 DECODER
2 .4
0 .7
(AC3D2av)
4 .6
0 .2
0
3 .2
0
0
0
3 .2
4 .7
0
4 .7
4 .7
0
STATIC RAM(1M SRAM)
+3.3V
REGULATOR
4.8 3.3
0
AK4324-VF-E2 AK4526A-VQ
HD74HC02FPEL IS61C1024-20J
13
24 33
12
34
F G
•
IC3: YSD917→See page 23(EX), 21(J)
•
IC4: YSS918D-F→See page 24~26(EX), 22~24(J)
V+
•
IC5: IS61C1024-20J→See page 27(EX), 25(J)
•
B OUT
IC6: AK4526A-VQ→See page 28(EX), 26(J)
•
IC7: AK4324-VF-E2→See page 27(EX), 25(J)
B –IN
B +IN
0
2.4
2.4
~
~ 0
~
0
A/D,D/A
~ 0
~
2.4
CONVERTER
~ 2.4
3.2 ~
~
0
~
(CODEC.
2.3
4.7 0 ADC/DAC)
4.7 0
0
0
0
4.7
D/A CONVERTER
(DAC)
0.5
0.5 0.5
0 0
4.8 0 0
0
4.8
2.3 4.8
4.7 0
2.4 2.4
~
2.4
2.3
2.4
0 2.3
0
0
4.8 4.8
0 0
0.5
0
0.5
4.8 0.5 0.2
4.8 0.5
0
0
0 0.5
YSS918D-F
YSD917
51 50
15
23 22
31
80
12 14 30
28
81
11
23 1 1
100
H I
6
Point
Pin 39 of IC6
V : 2V/div H : 50nsec/div
DC range 1 : 1 probe
0V
2V SAMPLE 50ns
L.P.F
6
6 6
7 7
0 0
5 5
0 0 0
8 8
0 0
2.4 11.9 11.9
2.4
2.4
2.4
2.4
–11.5
2.4 –11.5
3 3
4 4
0
2.4 1 0 1 0
2.4 2 2
0
0 0
2.4
2.4
DSP AMP MUTING
4.7
11.9
0
–10.9
4.8
0
0
–11.0
0.2
–11.0
0
0 –11.0
0
0
–11.5
MUTING
11.9
0
0
0
0
–10.9
FRONT L
0
–11.0
0
0.2
–10.9
0
0
0
0
0
–11.5
MUTE
0
DRIVE
–10.9
CENTER
0
0
LFE
–10.9
0
11.9
0
0
0
0
–10.9
0
0
–10.9
0
0
0
0
–11.5
Conditions (DSP-A5)
→ CD
• INPUT
→ minimum(–∞)
• VOLUME
• IMPEDANCE
→ Left
SELECTOR
• PRO LOGIC → On
J K L
MAIN L
(DSP)
–11.0
0
0
0
0
0 MAIN
0
L
0 0
–11.0
REAR L
All voltages are measured with a 10M Ω /V DC electric volt meter.
Components having special characteristics are marked and
must be replaced with parts having specifications equal to those
originally installed.
Schematic diagram is subject to change without notice.