Philips 20MC4304, Service Manual

Page: 17 / 316

1-4-3
Audio Block Diagram
TD901BLA
BLOCK DIA
GRAM FOR SECTION 2 (DECK MECHANISM)
MAIN CB
A
PO
WER SUPPL
Y /
A
V
CB
A
PB-A
UDIO SIGNAL
D
VD A
UDIO SIGNAL
REC-A
UDIO SIGNAL
IC1401
BIAS OSC
Q1872
P-ON+5V
P-ON+5V
Q1871
Q1873 Q1874
Q1875
(A
UDIO SIGNAL PR
OCESS)
N-A-IN N-A-OUT
TP1802
NA-IN-YCA
A
UDIO
HEAD
A
C
HEAD ASSEMBL
Y
A-COM A-PB/REC
CL1402
CN1804
CN2803
A
UDIO
ERASE HEAD
AE-H AE-H/FE-H
1 2
FE-H FE-H-GND
FULL ERASE HEAD
CL1403
4 3 1 2
FE HEAD UNIT
REC AMP
7
98
6
AU
T
O
BIAS
99
LINE AMP
MUTE
96
P
R
ALC
71
12
D-REC-H
D-REC-H
EXT -H
A-MUTE
EXT-H
T
O
SER
V
O/SYSTEM
CONTR
OL BLOCK
4
78
11
WF7
WF8
TO SER
V
O/SYSTEM
CONTR
OL BLOCK
3
1
EQ AMP
100
SP/LP-ON
2
IC1802
(OUTPUT SELECT)
IC2201 (OP AMP)
JK1801 HEADPHONE JA
C
K
SPEAKER R-CH
CN1802
CN1805
SP1802
TO Hi-Fi A
UDIO
BLOCK
T
O
D
VD
A
UDIO BLOCK
<D
VD SECIT
ON>
CN601
TO Hi-Fi A
UDIO
BLOCK
SW CTL.
Q2204
Q1803
CN2401
Q2202
JK2201
DIGIT
AL
A-OUT (CO
XIAL)
A-OUT(L) A-OUT(R)
A-OUT(R) A-OUT(L)
2 1
12 13
14 15
11
10
6 2
1 7
Q2205 BUFFER
IC1801
(A
UDIO AMP)
DC V
OL.
5 2
12
7
6
Q2207
76 80
7
D
VD-A-MUTE
1
SPDIF
4
D
VD-A
UDIO(R)
6
D
VD-A
UDIO(L)
88
D
V
D-A
UDIO(R)
77
D
V
D-A
UDIO(L)
11
11
J
A
CK-MUTE
10
10
D
VD-A-MUTE
55
JA
CK-OUT(R)
44
JA
CK-OUT(L)
FUNCTION CB
A
SPEAKER L-CH
CN2801
CN2805
SP2801
SP-R
1
SP-GND
2
SP-L
1
SP-GND
2
22
SP-L
D
VD-A-MUTE
CL1802
CL2801
T
O
SER
V
O/SYSTEM
CONTR
OL BLOCK
V
OL-CONT
Q1212
DV
D
-H
J
A
CK-MUTE
AL+5V
WF19
WF20
D
A
T
A(A
UDIO) SIGNAL
NO
TE FOR
WIRE CONNECT
ORS:
1.
PREFIX SYMBOL "CN" MEANS CONNECT
OR.
(CAN DISCONNECT AND RECONNECT
.)
2.
PREFIX SYMBOL "CL" MEANS
WIRE-SOLDER
HOLES OF
THE PCB
.
(WIRE IS SOLDERED DIRECTL
Y
.)
TEST POINT INFORMA
TION
:INDICA
TES A
TEST POINT
WITH A JUMPER
WIRE A
C
R
OSS A HOLE IN
THE PCB
.
:USED
T
O
INDICA
TE A
TEST POINT
WITH A COMPONENT LEAD ON FOIL SIDE.
:USED
T
O
INDICA
TE A
TEST POINT
WITH NO
TEST PIN.
:USED
T
O
INDICA
TE A
TEST POINT
WITH A
TEST PIN.