CM9750

LG CM9750 Service Manual

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3-15

ONE POINT REPAIR GUIDE

NO OPERATION OF MD

When no sound output in the CD function, you can not listen to music reading data from a CD

disc if the servo motors in MD don’t work. This step is for checking the sled motor among them.

9-2. SLED MOTOR

9-2-1. Solution

Replace IC401 or IC400 on MAIN board.

9-2-2. How to troubleshoot (Countermeasure)

1) Check the SLDO signal from pin23 of IC401.

 If no signal, check 3.3 V (RF) and X400.

2) Check the SLED+ & SLED- from IC400 to CN401 for driving SPINDLE motor. It is about 2.9 Vp-p.

 If no signal, check +1.8 V and +5 V for IC400.

3) Check if the FFC cable is solidly connected between CN401 and MD.

4) Check the MD.

 If the sled motor is sort-circuit or has any trouble, it can not move the pickup module.

Please check the function after changing another MD.

9-2-3. Service hint (Any picture / Remark)

< Waveform of SLED- & SLED+

for driving SLED motor >

zsR

zsT

< MAIN board top view >

SL-

pin9 of CN401

SL+

pin7 of CN401

IC400

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General

Type	-
Cassette deck	No
Product color	Black
Number of decks	1 deck(s)
Disc loading type	Tray
Optical disc player	Yes
Number of optical discs	1 discs
Speaker type	3-way
RMS rated power	- W
Woofer diameter	304.8 mm
Tweeter diameter	25.4 mm
Number of speakers	2
Mid-range driver diameter	165.1 mm
Subwoofer driver diameter (imperial)	12 \
Tuner type	Digital
FM band range	87.5 - 108 MHz
Supported radio bands	FM
Headphone connectivity	3.5 mm
USB 2.0 ports quantity	USB 2.0 ports have a data transmission speed of 480 Mbps, and are backwards compatible with USB 1.1 ports. You can connect all kinds of peripheral devices to them.
Microphone connectivity	6.3 mm
Apple docking compatibility	Not supported
Disc types supported	CD, CD-R, CD-RW
Playback disc formats	CD audio
Audio formats supported	MP3, WMA
Volume control	Rotary
Equalizer modes	Bass, Classic, Jazz, Pop, Rock
Power source	AC