LG OM7560 Service Manual

3-27
ELECTRICAL TROUBLESHOOTING GUIDE
4. PWM MODULATION CHECK
PWM MODULATION PART
CHECK
• Check IC601(TAS5548) 3.3 V - pin9, 14, 35, 50.
• Check X601 (12.288 MHz).
Replace X601(12.288 MHz).
Check each line resistor output.
Replace IC601.
Refer to
CD troubleshooting.
Replace R5T1, R559, R550.
OK
OK
OK
OK
Check IC601 pin21 CLK input.
Refer to
SMPS troubleshooting.
Check CN202
pin1, 2: 12 V.
Check
X601(12.288 MHz)
operation.
Check IC501 (MLC3730)
pin U13: RESET, pin L14: SDA
pin L13: SCL output.
Check X601
(12.288 MHz).
Check IC601
input data.
Check IC601.
Check
CD Assy communication
Pin22, 23, 24.
Check
IC601(TAS5548) input data
pin24 PWM wave.
Check
PWM modulator output
FL: Pin48(-),49(+). FR: Pin46(-),47(+).
Other output
check.
Check line resistor output
RST: R5T1, SCL: R550,
SDA: R595.
NO
NO
NO
NO
NO
NO
NONO
NO
NO
YES
YES
YES
YES
YES
YES
YESYES
YES
YES
YES
YES
YES
OK

LG OM7560 Specifications

Power

power consumption networked standby	0.5 W
bus power supply (USB)	5 V 0 500 mA
amplifier output power	1, 000 W

Wireless Specifications

frequency range	2402 to 2480 MHz
output power	10 dBm
minimum distance from body	20 cm

Weight and Dimensions

dimensions	330 mm x 815 mm x 302 mm
net weight	16.8 kg