Panasonic MW-20EB Service Manual page 10

3.2.3. No Sound output
D-AMP IC, IC110
to GND
oscillation check
D-AMP IC, IC110
DAC Output Check
BCLK
DATA LRCK
MCLK Check
IC103
VCC
No Sound Output
C166 Voltage Terminal Check
Voltage at 5V 5.5V
ES
D-AMP IC, IC110
Oscillating Signal Check
Is there oscillating
signal
ES
pin pin
Voltage Check
DAC IC, IC109
Output Check
Output OK
ES
DSP IC,
IC106 Check
CLOCK OK
ES
ADC IC, IC103 Check
Is there output
signal ?
Check IC101 &
iPod connection
NO
Power Supply Check
111 & 112
D-AMP IC, IC110
NO
CTL Voltage Check
High Voltage (+3V
Yes
D-AMP IC
IC110 Check
NO
AUDIO_RST Check
High Voltage ? +3V
YES
AUDIO_RST Check
NO
24.576MHz Oscillating circuit
DSP IC, IC106 abnormal
Clock generation at IC1008
Check IC101 for
NO
abnormality
10
IC1000 Mute &
NO
STBY Line
Abnormality
IC109 VCC
Voltage supply
check
IC1000
NO
AUDIO_RST line
abnormality
or
X200 oscillating signal
abnormality
SD Audio