Table of Contents
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8. PWM MODULATION PART CHECK
PWM MODULATION
PART CHECK
YES
P7905 PIN9,10
Refer to SMPS
3.3V Check
NO
Troubleshooting
YES
Check IC604(PS9830)
NO
Check X601
VDD PIN VOLTAGE
12.288MHz
(3,10,22,29,39,47,56,65,72,87,94)
Check X601 PIN2 :3.3V
YES
Check
X601 12.288MHz
Operation.
YES
IC604
Resistor output
PIN86 CLK INPUT
SDA:R671,SCL:R670
Check
YES
Check
IC100(LC87Fxx)
PIN22:PWM REST
PIN79:PWM SDA
NO
PIN80:PWM SCL
OUTPUT
DVD ASSY Communication
YES
Check
IC604(PS9830)
IC604(PS9830) DATA
DATA INPUT PIN23,24,25,26
NO
PWM WAVE
Check.
YES
Check PWM
Modulator output
FL:PIN75(+),74(-)
IC604(PS9830)
NO
FR:PIN71(+),70(-)
OTHER OUTPUT
Check
YES
OK
Note: This shooting is the original circuitry so there are some different points from RXD-M909.
Replace X601.
NO
YES
OK
Check LINE
Replace R671,R670,R665
NO
RST:R665
YES
OK
Check
Refer to DVD troubleshooting
NO
P7403
YES
Check
Check each LINE
Resistor output
NO
INPUT
YES
OK
Check
Replace IC604.
NO
YES
OK
9. POWER AMP PART CHECK
POWER AMP PART CHECK
YES
P7905 PIN3:+12v
PIN13,14,15:32V
YES
Check each IC700
PIN27,26,32,35,40,41 INPUT VOLTAGE
YES
Check each
IC700 PIN1,22,23,44:+12V
INPUT
YES
Check PWM Modulator input
each PIN6,8,16,18.
YES
POWER IC700
PIN28,31,36,39 output.
YES
Check output
line coil.
YES
OK
NO
Refer to SMPS Troubleshooting.
NO
Check each line resistor output voltage.
NO
Replace the coil.
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