3-24
ELECTRICAL TROUBLESHOOTING GUIDE
5. PWM MODULATION CHECK
PWM MODULATION PART
CHECK
• Check IC700(TAS5548) VDD 3.3 V - Pin9, 14, 35, 50.
• Check X701 (12.288 MHz).
Replace X701 (12.288 MHz).
Replace IC502.
Refer to AUX or Data
troubleshooting.
Check each line
resistor output.
Replace IC502.
OK
Check input data
IC502 Pin F1, F2, G1.
Check MCS_MCLK output data
IC502 Pin D2.
OK
OK
OK
Check IC701 Pin21 CLK input.
Refer to SMPS and DC-DC
convertor troubleshooting.
Check
L605(PWM_3.3V).
Check
X701(12.288 MHz)
operation.
Check X701
(12.288 MHz)
Check IC502.
Check
Data communication
Pin24, 25.
Check
IC701 input data..
Check IC701.
Check IC502(MLC3730S)
Pin B3: PWM_RST, Pin A1: PWM_DATA
Pin A2: PWM_CLK output.
Check
IC701(TAS5548)
input data Pin24
PWM wave.
Check PWM
modulator output
FL: Pin48(-), 49(+)
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
OK
Содержание OM4560
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