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CM9540
LG CM9540 Service Manual
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3-45
3-46
2. MAIN SYSTEM BLOCK DIAGRAM
L
C
78615E
RF
+ SE
R
V
O
A
M
5890
Mo
to
r
Dr
ive
A,
B,
C
,
D
,
E,
F
,
P
D
LD
U
SB_
H
UB_
DP
/DN
C
S5346
M
L
C
3730
MCS
LO
GI
C
SPDO/
S
L
DO
/FOD/
TR
D
LOAD
±
,
SLED
±,
S
P
IN±
,T
R±
,F±
O
P_
SW,
C
L
_
SW,
UP_
SW,
DN_S
W,D_
SENSE
MO
T_MUT
E,C
L
O
SE,OPE
N
AD
C_
DATA
DA
C
_M
C
L
K
/BCK
/L
R
CK
PT
_L
/
R
AU
X_
L
/R
AU
X
US
B
1
Po
rt
a
bl
e
C
D
_D
I
N
_D
OU
T
CD_
R/W,
BU
SY,
C
D
_16M
,
SU
BSYQ,
CD_
RS
T
CD_
MCK
/B
CK
/L
RCK
/DA
T
A
TU
NE
R
_
L
/R
US
B
2
TU
N
ER
FR
ON
T
MI
COM
R5F
100G
EA
F
B
V
F
D_STB/
CL
K
/
DO/
R
S
T
S
T
A
N
D
B
Y
_LE
D
,V
O
L_LE
D
,
V
F
D_L
E
D/
R
EMOC
ON
U
SB
_
PW
R_C
T
RL/
V
O
L
_
A
/
B
/
KEY
1,
2,
3
E2PR
OM_C
L
K/
DA
TA
T
A
S5548
PWM
FL
±
RL
±
DR
I
VE
R
IRS2092
(x
4E
A
)
Front : 385W x 2
Surr : 385W x 2
Woofer : 385W x 2
16.9344MHz
VF
D
DIG301
IR
Rec
eiv
er
LE
D
_C
T
RL,
FI
LE
A
/
B
,
S
C
RA
T
C
H
A
/
B
FA
N
C
T
RL,
MI
C
_
V
O
L
A
/
B
Vo
lume/
Ke
y
32.768KHz
M
CU
_
CS
/M
CU
_
RS
T
MUC
_TX
/
R
X
MI
C
_
O
_DA
TA
0
(+3
.
3
V
)
(+3
.
3
V
_U
C
OM
)
(+3
.
3
V
_CD,
VC
C
1
.
2)
(+5
V
)
(
+3.
3V
_R
F
,
+3.3V
_C
D,
+1.
8V
)
(+3
.
3
V
_U
S
B)
(+5
V
,
+3.
3V
_ADC
)
(+3
.
3
V
)
M
P/U
P
DECK
ME
CHAN
I
SM
(
V
C
C
50)
12.288MHz
FR
±
RR
±
SW
DAC
I
C
A
Z
4580
DAC
I
C
A
Z
4580
DAC
I
C
A
Z
4580
FL
RL
FR
RR
SW
FE
T
IR
F67
75
(x
1
2E
A)
FL
RL
FR
RR
SW1
SW2
FL
RL
SW1
SW2
I2C/EXT_
M
UTE
/
R
ST
PWM_MC
K/
BC
K/
LRC
K
SPENA
AG
L
_
F
/R
AG
L
_
SW
PR
O
TEC
/
SD
/
DC
P
OTW
TH
FA
N_
C
T
L
AM
P
_
OSC
MC
S
I
nterface
128M
b
i
t
SD
R
A
M
8
MByte
S
erial
Fl
as
h
(+3
.
3
V
_CD)
(+3
.
3
V
_CD)
CL
K/D
AT/CE
/R
S
T
/G
P
O2
S430
8
MI
C
MI
C
_
S
I
G0
MI
C
_
S
I
G
(+5
_MIC)
MI
C
_
D
ET
MI
C COD
E
C
A
DC COD
E
C
BT
BT_
R
X,
BT_
CTS
EEPR
O
M
24MHz
FL1
FL2
63
65
Table of Contents
Section 1 Summary
3
Table of Contents
3
Servicing Precautions
4
Esd Precautions
6
Hidden Key Mode
7
Service Information for Eeprom
8
Program Download & Update Guide
9
Specifications
13
Section 2 Cabinet & Main Chassis
14
Cabinet and Main Frame Section (Cm9540)
16
Exploded Views
16
Mechanism Deck Section (Dp17Tm2)
17
Packing Accessory Section
18
Speaker Section
19
Section 3 Electrical
22
One Point Repair Guide
23
Power
23
Booting When Power on the Set
25
Vfd Is Not Displayed When Power on the Set
26
Booting in CD/Usb Function
28
Operation of MD (Driving the Servo Motors)
33
Sound
38
Audio Output Is Small or no Audio Output
43
Power on (Standby Led Is Blinking)
44
Speaker no Audio
45
Electrical Troubleshooting Guide
46
Power Supply on Smps Board
46
System Part
50
Audio Part
51
Lighting (Woofer Speaker)
56
Waveforms of Major Check Point
57
Wiring Diagram
62
Block Diagrams
63
Smps Block Diagram
63
Main System Block Diagram
64
Main Power Block Diagram
65
Circuit Diagrams
66
Smps - Power #1 Circuit Diagram
66
Smps - Power #2 Circuit Diagram
67
Main - CD Dsp Circuit Diagram
68
Main - Rf / Servo Circuit Diagram
69
Main - Adc / Pwm Circuit Diagram
70
Main - Amp Circuit Diagram
71
Front Volume Circuit Diagram
72
MIC & Portable Circuit Diagram
73
Front Speaker Main Circuit Diagram
74
Front Speaker Sub Circuit Diagram
75
Woofer Speaker Main Circuit Diagram
76
Woofer Speaker Sub Circuit Diagram
77
Capacitors
78
Circuit Voltage Chart
78
Connectors
78
Printed Circuit Board Diagrams
79
Smps P.C.board
79
Main P.C.board
81
Front Volume P.C.board
83
Front Speaker Main P.C.board
84
Front Speaker Sub P.C.board
84
MIC & Portable P.C.board
84
Woofer Speaker Main P.C.board
85
Woofer Speaker Sub P.C.board
85
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Owner's Manual
40 pages
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LG CM9540 Specifications
General
Brand
LG
Model
CM9540
Category
Stereo System
Language
English
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