2. No Sound. Noise generated
2.1.1. COMMON (DIR-SPK Out / signal)
Check the digital audio data input/output between DIR - FPGA.
MAIN PCB
[IC1451] : 17, 18, 19, 20pin
(DIR_DATA, DIR_LRCK, DIR_BCK, DIR_MCK)
➡
[IC1501] : K1, J1, J2, M1 pin
Check the digital audio data output between FPGA – PWM Mod-
ulator.
MAIN PCB
[IC1501] : T2, R5, T4 pin (FPGA_DATA, FPGA_LRCK, FPGA_BCK)
➡
[IC1701] : 81, 80, 82 pin
Check the PWM waveform output between PWM Modulator -
Gate Driver.
MAIN PCB
1. [IC1701] : 36, 33 pin (CH2_PWM0, CH3_PWM0)
➡ Square wave of approximately 3.3V p-p / 844kHz
[IC1706] : 1, 3 pin
2. [IC1701] : 34, 31 pin (CH2_PWM2, CH3_PWM2)
➡ Square wave of approximately 3.3V p-p / 844kHz
[IC1801] : 2 pin, [IC1851] : 2 pin
3. [IC1706] : 7, 5 pin (CH2_PWM0, CH3_PWM0)
➡ Square wave of approximately -32V Offset has been 5V p-p / 844kHz
[IC1803] : 1, 3, 6 pin, [IC1853] : 1, 3, 6 pin
4. [IC1801] : 6 pin (CH2_PWM2)
[IC1851] : 6 pin (CH3_PWM2)
➡ Square wave of approximately 60V p-p / 844kHz
[IC1802] : 1, 3, 6 pin, [IC1852] : 1, 3, 6 pin
5. [IC1802] : 2, 5, 7 pin (CH2_PWM2)
[IC1852] : 2, 5, 7 pin (CH3_PWM2)
➡ Square wave of approximately 60V p-p / 844kHz
[Q1801] : 2 pin, [Q1851] : 2 pin
6. [IC1803] : 2, 5, 7 pin (CH2_PWM0)
[IC1853] : 2, 5, 7 pin (CH3_PWM0)
➡ Square wave of approximately -32V Offset has been 5V p-p / 844kHz
[Q1804] : 2 pin, [Q1854] : 2 pin
Check the PWM waveform output between Gate Driver - Final
FET.
MAIN PCB
1. [Q1801] : 5 - 10 pin, [Q1851] : 5-10 pin
➡ Square wave of approximately 64V p-p / 844kHz
[Q1802], [Q1852]
2. [Q1804] : 5-10 pin, [Q1854] : 5-10 pin
➡ Square wave of approximately -32V Offset has been 10V pp / 844kHz
[Q1805], [Q1855]
Check the parts (L, C, R) used in the filter circuit after Final FET
(Q1802/Q1805) and (Q1852/Q1855)
Check the soldering or replace the device.
[IC1451] : 17, 18, 19, 20 pin
[IC1501] : K1, J1, J2, M1 pin
Check the soldering or replace the device.
[IC1501] : T2, R5, T4 pin
[IC1701] : 81, 80, 82 pin
Check the soldering or replace the device.
1. [IC1701] : 36, 33 pin, [IC1701] : 1, 3 pin
2. [IC1701] : 34, 31 pin, [IC1801] : 2 pin, [IC1851] : 2 pin
3. [IC1706] : 7, 5 pin, [IC1803] : 1, 3, 6 pin, [IC1853] : 1, 3, 6 pin
4. [IC1801] : 6 pin, [IC1851] : 6 pin, [IC1802] : 1, 3, 6 pin,
[IC1852] : 1, 3, 6 pin
5. [IC1802] : 2, 5, 7 pin, [IC1852] : 2, 5, 7 pin, [Q1801] : 2 pin
[Q1851] : 2 pin
6. [IC1803] : 2, 5, 7 pin, [IC1853] : 2, 5, 7 pin, [Q1804] : 2 pin
[Q1854] : 2 pin
Check the soldering or replace the device.
1. [Q1801] : 5 - 10 pin, [Q1851] : 5 - 10 pin
[Q1802], [Q1852]
2. [Q1804] : 5 - 10 pin, [Q1854] : 5 - 10 pin
[Q1805], [Q1855]
Check the soldering or replace the device.
OK
OK
OK
OK
OK
NG
NG
NG
NG
NG
No faults
Identify the input function from which sound is not output or from which noise occurs, and then check the troubleshooting sec-
tions from 2.3 onwards.
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