Yamaha DSP-A595a Service Manual page 25

A B C
SCHEMATIC DIAGRAM (OPERATION)
1
Q Q
3 7
2
3
4.8
4.8
-11.7
4.8
4.3
4.1
4.1
4.8
4 -11.7 0
0
4.8
4.8
0
4.8
0
4.8
0
0
0
4.4
0.1
4.5
0.1
4.8
5.0
5 4.8
T E
L 1 3 9 4
6
7
Point 3
8
(Pin 16 of IC800)
V : 2V/div H : 50nsec/div
AC range 1 : 1 probe
CH1
0V 0V
(CH1)
CH2
0V
9 2V SAMPLE 50ns (CH2)
w w w
PIN CONNECTION DIAGRAM OF DIODES, TRANSISTORS AND IC's.
.
1SS133 HZS7C2TD S1NB20 2SA933A(Q,R)
2SC2878(A,B) 2SC4488(S,T)
10
1SS176 HZS12B2TD 2SC1740S(R,S)
HSS104 DTA144ES
HZS5B2TD DTC144ES
HZS6C2TD
HZS7B2TD
Anode
B
C
B
Cathode C E
E
D E F
6 3 1 5 1
~
-19 .6
~
SYSTEM & DSP
-8.9
4.8
CONTROL
-27.0
-27.0
-27.0
-27.0
-27.0
LC876564A-5M19 -27.0
-27.0
-27.0
-27.0
-27.2
-27.2
-27.2
-27.2
-27.3
-27.3
+5V
2 2 9 6 5 1 3
3
0.3
0
0.3
0.2
0
0 0
TAPE/MD MON
/EXT.DECODER
Point 4
CH1 : Pin 11 of IC800
CH2 : Emitter of Q806
V : 2V/div H : 0.5sec/div
DC range 1 : 1probe
2V 2V SAMPLE 0.5s
With the POWER Disconnect the
switch turned ON, power cord from
connect the the AC outlet.
power cord to the
AC outlet.
This waveform is not available by pushing the
power switch ON and OFF.
x a o
y
i
2SD2396(J,K) NJM2068LD
LC876564A-5M19
8
http://www.xiaoyu163.com
G H
5 0
S VIDEO
VIDEO
AUDIO
-22.7
-29.7
4
4.8
0
0
0
0
4.8 5.5 5.5
13.2
6.1
4.8
0
13.1
13.2
12.4
6.5 5.8
0
Q Q
3 7 6 3
13.1
0
0
0.7
1.9
0
OPE(1)
#17
u 1 6 3
.
http://www.xiaoyu163.com
I J K
8 9 2 4 9
#13
TONE CONTROL
NJM2068LD 11.8
11.8
0
0.1
0
0
0
0.1
0 0
-11.6
-11.6
0 0
0
0.1
0
0
0
0.1
-11.7
NJM2068LD -11.7
MAIN L
1 5 1 5 0 8 9 2
SUB POWER SUPPLY
AC12.6
13.1
0
POWER SUPPLY
AC6.5
29.3
-29.7 AC47.7
18.8
-19.5
AC31.2
10.0 0 9.4
m
c o
Conditions
• INPUT
• VOLUME
• IMPEDANCE
SELECTOR
• PRO LOGIC → On
L M N
DSP-A595a
8 2 9 9
IC801, 802 : NJM2068LD
Dual OP-Amp
+ +
– –
1 2 3 4 5 6 7 8
• IC800: LC876564A-5M19→See page E-20/J-18~E-22/J-20
OPE(2),(3),(4)
4 9 8 2 9 9
:NOT USED
:USED
VOLTAGE
SELECTOR
All voltages are measured with a 10M Ω /V DC electric volt meter.
→ CD Components having special characteristics are marked and
→ minimum(–∞)
must be replaced with parts having specifications equal to those
originally installed.
→ Upper
Schematic diagram is subject to change without notice.
E-52/J-50