Yamaha DSP-A5 Service Manual page 44

A B
I SCHEMATIC DIAGRAM [MAIN (1/2)]
1
LIMITTER
44.4 44.5
43.9
30.7
30.7
20.4
0
0
0
0
MAIN POWER AMP
2
MAIN L
43.3 44.4
0
–0.7
–0.7
3
43.3
–0.1
–0.7
–0.7
4
REAR POWER AMP
REAR
L
43.3
0
–0.6
5
43.2
6
–0.1
–0.7
–0.7
CENTER POWER AMP
CENTER
7
43.8
–0.1
–0.7 –0.7
8
–12.0
0
C D
E
MAIN POWER AMP
1.0
30.7
–0.4
20.6
–1.0
–1.0
44.1
43.3
1.0
–44.2
0
0
1.0
–0.5
–1.1
43.3
43.3
1.0
–1.1
44.4
–0.1
–44.1
–0.1
REAR POWER AMP
1.0
–0.4
44.0 –1.0
43.3 1.0
44.4
0
–0.6
–1.0
–44.1
44.0
1.0
43.2
1.0
–0.4
–1.1
44.4
–0.1
–1.1
–44.0
CENTER POWER AMP
44.0
43.8
1.0
1.0
44.4
–0.5
–0.1
–1.1
–1.1
–44.1
–44.3 –45.3
–44.3
–45.3
–44.9 –45.1
–44.7
0
–44.9
0
0
0
LIMITTER
G
F
45.2
45.2
45.2
45.2
0
1.0
0.5
0.5
0
45.2
0
0
MAIN L
0
–0.5
–0.5
–45.2
–1.0 –45.2
0
0
45.2
45.2
1.0
0.5 0.5
45.2
0
0
0
0
–0.5 –0.5
–1.1
–45.2 –45.2
0
0
24.1
12.0
45.2
1.0 45.2
0.5
–28.8
45.2
0.5 –28.8
0
0
–28.8
0
0
0
–0.5 REAR
–0.5
0 L
–45.2
–1.0
0
–45.2
45.2
45.2
1.0
0.5
0.5
0
45.2
0
0
0
–0.5
–0.5
0
–1.1
–45.2
0
–45.2
24.1
45.2
12.1
24.1
45.2
1.0
0.5 45.2
0.5 0
0
0
CENTER
0
–0.5
–0.5
–45.2
–1.1
0
0
–45.2
–24.0 –33.5
–32.7 –32.2 –33.9
H I
BE
RE
0 0
0.5 0.5
0.5
0
SPEAKER
RELAY
DRIVE
0.1
0.7
0.1
0
–28.1
0.1
#16
0.8
0
SPEAKERS
OUTPUT
L
0.5 0
REAR
(SURROUND)
R
0.5 0
0.5 0
CENTER
SPEAKERS
L
REAR
(SURROUND)
R
0.1
CENTER
0.1
: NOT USED
J K
DSP-A5
PHONES
B A
SPEAKERS
SPEAKERS
OUTPUT
L
MAIN
MAIN
L
R
L
BL
A
BL
R
SPEAKERS
MAIN
L
B
R
PIN CONNECTION
DIAGRAM OF DIODES,
TRANSISTORS AND IC's.
1SS133 MTZJ10C
1SS176 MTZJ12C
Anode
HSS104 MTZJ15A
1SS270A MTZJ16A
MTZJ4.7C MTZJ30.0A
Cathode
MTZJ8.2A
2SD1915F(S,T)
B
C
E
2SA1015(Y) 2SA1708(S,T)
2SB949(O,Y) 2SA1770(S,T)
2SC893A(D,E) 2SC4488(S,T)
2SC1815(Y) 2SC4614(S,T)
2SC1890A(D,E)
E
C B
B
C
E
2SB1565(E,F)
2SA1695(O,P,Y)
2SD2396(J,K)
2SC4468(O,P,Y)
Conditions (DSP-A5)
→ CD
• INPUT
→ minimum(–∞)
• VOLUME
• IMPEDANCE
→ Left
SELECTOR
• PRO LOGIC → On
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.
E-52/J-50