1-1
Copyright © 200
9
LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
CONTENTS
SECTION 1
GENERAL
SERVICING PRECAUTIONS
................................1-2
• NOTES REGARDING HANDLING
OF THE PICK-UP
• NOTES REGARDING COMPACT DISC
PLAYER REPAIRS
ESD PRECAUTIONS
............................................1-4
LOCATION OF USERS CONTROLS
....................1-5
SPECIFICATIONS
.................................................1-7
SECTION 2
EXPLODED VIEWS
CABINET EXPLODED VIEW
................................2-1
TAPE DECK MECHANISM EXPLODED VIEW
....2-3
1. TAPE DECK MECHANISM
(A/S & A/S : RIGHT A/S DECK) ..................2-3
2. TAPE DECK MECHANISM
(A/S & A/S : LEFT A/S DECK) ....................2-5
CD MECHANISM EXPLODED VIEW
...................2-7
SPEAKER EXPLODED VIEW
..............................2-9
MODEL : MCS112F .........................................2-9
PACKING ACCESSORY VIEW
...........................2-13
SECTION 3
AUDIO PART ELECTRICAL
AUDIO ELECTRICAL
TROUBLESHOOTING GUIDE
..............................3-1
1. POWER (SMPS) .........................................3-1
2. P-SENS .......................................................3-2
3. VKK CHECK................................................3-2
4. MICOM PART CHECK I ..............................3-2
5. MICOM PART CHECK II .............................3-3
6. IC103(KS4CD21CS) CHECK ......................3-4
7. FLD DISPLAY CHECK ................................3-5
8. PWM MODULATION PART CHECK ...........3-6
9. POWER AMP PART CHECK ......................3-7
10. AUX FUNCTION CHECK ............................3-8
11. TUNER FUNCTION CHECK .......................3-9
12. TAPE FUNCTION CHECK ........................3-10
13. TAPE PLAY PART CHECK ........................3-11
14. TAPE REC PART CHECK .........................3-12
INTERNAL BLOCK DIAGRAM OF ICs
..............3-13
1. ES6838 .......................................................3-13
2. HA12237F. ..................................................3-14
3. PS9829B ....................................................3-15
4. PT6324 .......................................................3-15
5. STR-S6757IF1905......................................3-16
6. TAS5142 .....................................................3-17
7. U1739EJ2V1UD00/KF2_E .........................3-18
WIRING DIAGRAM
.............................................3-19
BLOCK DIAGRAMS
...........................................3-21
1. SMPS BLOCK DIAGRAM .........................3-21
2. MAIN & FRONT BLOCK DIAGRAM .........3-23
SCHEMATIC DIAGRAMS
...................................3-25
1. SMPS SCHEMATIC DIAGRAM ................3-25
2. MAIN SCHEMATIC DIAGRAM..................3-27
3. AMP SCHEMATIC DIAGRAM ...................3-29
4. DECK SCHEMATIC DIAGRAM.................3-31
5. FRONT SCHEMATIC DIAGRAM .................3-33
6. KEY-L SCHEMATIC DIAGRAM ...................3-35
7. KEY-R SCHEMATIC DIAGRAM...................3-36
PRINTED CIRCUIT BOARD DIAGRAMS
...........3-37
1. MAIN P.C.BOARD .....................................3-37
2. FRONT P.C.BOARD..................................3-41
3. SMPS P.C.BOARD ....................................3-43
4. KEY-L P.C.BOARD ....................................3-44
5. KEY-R P.C.BOARD ...................................3-44
SECTION 4
CD PART ELECTRICAL
CD ELECTRICAL
TROUBLESHOOTING GUIDE
..............................4-1
1. CD PART TROUBLESHOOTING ................4-1
2. USB PART TROUBLESHOOTING..............4-9
WAVEFORMS OF MAJOR CHECK POINT
.......4-10
SCHEMATIC DIAGRAMS
...................................4-13
1. CD SCHEMATIC DIAGRAM .....................4-13
2. USB SCHEMATIC DIAGRAM ...................4-15
PRINTED CIRCUIT BOARD DIAGRAM
.............4-17
CD P.C.BOARD .............................................4-17
SECTION 5
REPLACEMENT
PARTS LIST
............................................5-1
