Rautz HC-7852UX Service Manual - page 17
Manual is about: Digital Home Cinema System
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Trouble Shooting Guide
OK
Yes
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Audio Abnormal of
DVD Function
USB Function.
Digital Audio Input Function.
AUX Function.
TUNER Function.
3. AUDIO Abnormal
Check if the I2S
output of IC501
is ok?
Check if the I2S
input of IC801
is ok?
Check if the
PWM output of
IC801 is ok?
Check if
suppled power
is ok?
Check if the
PWM output of
Digital Amp is
ok?
Check if the
Power down of
Digital Amp is
ok?
Check LPF L801 to L812.
Check AMP_PD of IC201.
Check Bias Voltge 3.3V of IC804, IC807.
Check short between Signal to GND or VCC.
Check Supplied Power
3.3V.
Check Resister
HR801 ~ HR804.
Replace IC501.
Check if
Speaker Output
is ok?
No
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes