Yamaha DSP-A5 Schematics
BACDEF HG
71
HD74HC02FPEL
8
14
2V
SAMPLE 50ns
0V
Point
6
Pin 39 of IC6
V : 2V/div H : 50nsec/div
DC range 1 : 1 probe
■ PRINTED CIRCUIT BOARD (Foil side)
DSP-A5
1
TO: INPUT (1)
#3
ERRA
TXAC
/ICD
DBL
RXAC
CEAC2
/ICAC
2
17 32
IS61C1024-20J
116
3
P. C. B. DSP P. C. B. DSP
TO: INPUT (4)
#1
DBS-C/O
uPC29M33T-E1
+5D
DIB
#1
DSIG
DVD-C/O
DIA
DG
#1
LIN
RL
FL
C
RR
#6
LFE
FR
5
8
E
L
E
R
#6
E
RIN
uPC4570G2
58
4
1
4
1
uPC4570G2
58
uPC4570G2
4
1
CECOD
CEAC1
SCKD
INTD
+5D
#3
DG
CLKAC
SOD
#3
SID
COM
/CSD
OUT
IN
+12
–12
TO: INPUT (1)
uPC4570G2
4
1
#6
uPC4570G2
5
4
8
1
5
8
4
5
51
50 81
YSS918D-F
31 100
●
Semiconductor Location
80
130
Ref. No. Location
D1 F3
D2 F3
D4 D4
D5 G4
D6 G4
D7 G4
D8 G4
D9 G4
D10 G4
D11 G4
D12 G4
D14 D4
D15 D4
D16 D4
D17 D4
D150 H4
D151 G4
D152 H4
8
5
15
YSD917
9
14
28
1
NJM2904M
14
23
22
AK4526A-VQ
12
5 6
Ref. No. Location
IC1 B3
IC2 F3
IC3 B4
IC4 A3
IC5 A3
IC6 C4
IC7 D4
IC8 C3
IC9 C3
IC10 D3
IC11 D3
IC13 C3
IC15 B3
Ref. No. Location
Q1 H4
Q2 H4
Q3 H4
Q4 H2
Q5 H3
Q6 H3
Q7 H3
Q8 G3
Q9 G3
Q10 G3
Q11 G3
Q12 H3
Q13 H3
Point
Pin 9 of IC3
V : 2V/div H : 50nsec/div
DC range 1 : 1 probe
0V
Q14 D4
2V
33
34
39
44
111
13 24
AK4324-VF-E2
112
5
SAMPLE 50ns
6
E-40/J-38 E-41/J-39
BACDEFG
PRV2
CELC
DTB
VDN
/CSD
CEAC1
SCK
SCKD
MG
SOD
CLKAC
RXAC
CEAC2
ERRA
/ST
DO
RCE
RCK
F-RX
FCE
MG
CNVSS
F-TX
F-CK
+5BU
/RES
CETC
CKB
VUP
CECOD
FMT
SDT
SID
+5M
MG
INTD
TXAC
DBL
/ICD
METER
TCE
DEST/RDO
RDT
#501
#501
#501
TO: INPUT (1)
ERY
PRV1VPPRD
PRI
SRY
SI2
PRYMGLIMDT
#503
W553
TO: MAIN (1)
W551
GY
W552
GY
FROM:
POWER
TRANSFORMER
3
FLASH
µ-COM
WRITE
CONNECTOR
4
INPUT SELECTOR
INPUT
MODE
EFFECT
TAPE/MD MON
/EXT. DECODER
NEXT SET MENU
PROGRAM
STANDBY / ON
–+
17 18 22 25 30
1
13
30
50
51
80
81
100
M30217MA-A203FP
31
35 43 46 50 55 6160 64 65
G
VC
VO
COM
NJM78L05A
OUT
IN
40
12
COM
B
A
R,T,A,L
only
R,T only
J only
J only
W551
W552
#303
TO: INPUT (2)
VIDEO AUX
S VIDEO VIDEO L AUDIO R
E
VE
AUX-C
1
3
2
4
AXR
AXL
AUX-Y
AUX-V
#303
#303
DSP-A5
■ PRINTED CIRCUIT BOARD (Foil side)
1
2
H
P. C. B. OPERATION (1)
3
Point
3
(Pin 13 of IC501)
V : 2V/div H : 20µsec/div
4
DC range 1 : 1 probe
0V
5
6
CH1
0V
(CH1)
CH2
0V
(CH2)
E-42/J-40
2V
Point
4
CH1 : Emitter of Q504
CH2 : Collector of Q503
V : 5V or 2V/div H : 5sec/div
DC range 1 : 1 probe
SAMPLE 20us
5V 2V
With the POWER
switch turned ON,
connect the
power cord to the
AC outlet.
This waveform is not available by pushing the
power switch ON and OFF.
SAMPLE 5s
Disconnect the
power cord from
the AC outlet.
TO:
INPUT (1)
#581
W581
+12
14
8
5
NJM2068D-D
–12
TIR
E
TIL
E
TOR
E
TOL
P. C. B. OPERATION (2)P. C. B. OPERATION (3)
● Semiconductor Location
Ref. No.
D501
D502
D503
D504
D505
D506
D507
D508
D509
D510
D511
D512
IC501
IC502
IC581
IC582
Q501
Q502
Q503
Q504
Q505
Q506
Location
E2
G2
G2
E2
F3
E2
E2
G2
G2
G3
G3
G2
E2
G2
E5
F5
D2
D2
G2
G3
F2
F2
BASS TREBLE BALANCE
14
8
5
NJM2068D-D
E-43/J-41
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