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Stereo System
CJS98F
LG CJS98F User Manual
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3-28
ELECTRICAL TROUBLESHOOTING GUIDE
2. SYSTEM PART
Power on.
FRONT board OK.
Check FFC cable.
Check FFC cable.
Check MAIN board.
Check SMPS board.
Replace VFD301.
F+/- & VH voltage OK?
Check MAIN board.
“HELLO”
Display on FLD
OK?
When turn
the volume, count is
change?
NO
NO
NO
NO
NO
NO
NO
CN101
cable connection
OK?
Check
CN101 pin3, 4 I2C data
OK?
CN101
pin5, 6, 7 data signal
OK?
CN101
pin11, 22, 25,power
OK?
YES
YES
YES
YES
YES
YES
56
58
Table of Contents
Section 1 Summary
3
Default Chapter
3
Table of Contents
3
Servicing Precautions
4
Esd Precautions
6
1 Hidden Key Mode Table
7
Hidden Key Mode
7
2 Hidden Key Mode Description
8
Service Information for Eeprom
10
Program Download Guide
11
Fota Update Step Using Bt App
14
Specifications
16
Section 2 Cabinet & Main Chassis
18
Exploded Views
20
Cabinet and Main Frame Section
20
Packing Accessory Section
22
Speaker Section
23
Disassembly Instructions
24
Case Top
24
Panel Front Assembly
24
Panel PCB & Multi Knob
25
Bracket Hook
26
Main PCB & SMPS PCB
27
Bracket Inner
28
MD & Lighting PCB
29
Panel Rear
29
Section 3 Electrical
30
One Point Repair Guide
31
No Power
31
No Booting When Power on the Set
33
No Booting in CD/Usb Function
35
No Operation of MD
40
No Sound in the Usb Function
44
Audio Output Is Small or no Audio Output
45
No Power on (Standby Led Is Blinking)
46
Speaker no Audio
47
No Sound
49
Vfd Is Not Displayed When Power on the Set
53
Electrical Troubleshooting Guide
54
Power Supply on Smps Board
55
System Part
57
No Audio Check
59
No Lighting (Speaker Led)
63
Waveforms of Major Check Point
64
Dsp (Ic501)
64
Pwm (Ic600)
65
Servo (Ic401)
66
Motor Driver (Ic400)
67
Adc
70
Wiring Diagram
70
Block Diagram
71
Circuit Voltage Chart
72
Capacitor Voltage
72
Printed Circuit Board Diagrams
73
Smps P.C.board Diagram
73
Main P.C.board Diagram
75
Front P.C.board Diagram
77
Jack P.C.board Diagram
79
Led Connector P.C.board Diagram
79
Section 4 Mechanism (Dm14B)
80
Deck Mechanism Disassembly
81
Cover Top
81
Clamp Assembly
81
Plate
81
Magnet
81
Clamp
81
Tray Disc
82
Pick up Assembly
83
Base Up/Down
83
Belt Loading
84
Gear Pulley
84
Gear Loading
84
Guide
84
Deck PCB Assembly
84
Motor Assembly
84
FFC Cable
84
Deck Mechanism Exploded View (Dm14B)
85
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LG CJS98F Specifications
General
Brand
LG
Model
CJS98F
Category
Stereo System
Language
English
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