NO
SOUND
If
there is no sound output on the USB function, repair the machine according to
the instructions below.
THE USB FUNCTION
Solution
Check
and replace the IC501, IC504 in the main and IC3U01 card into the USB adapter.
How
to Solve Problems (countermeasures)
1)
Check for +5 VU to USB card. Check for
5.6 V Pin1, 2 in CN3U1.
2)
Check USB D ± the main board to the USB board.
A.
Check USB_HUB_DN / DP signals IC501 (Pin16, 18)
B.
Check signal USB1 / 2_DN / DP IC504 of CN502 (Pin1, 2, 4 and 5). If there are any problems, check the power
for each IC. The power is normal but, if
the waveform signal to the IC is distorted or no signal exists, replace it with
a new one.
3)
Make sure the "AMP block of digital audio" in Item 6-3 is normal.
NO
SOUND
If
there is no sound output in the function DIGITAL AUDIO AMP DAMAGE, repair Apparatus
according to the following instructions.
DAMAGE
TO AMP DIGITAL AUDIO (IN ALL FUNCTIONS)
Check
and replace the IC701, IC702, IC703 in the MAIN board.
How
to Solve Problems (countermeasures)
1)
Check the ± FL, FR ± signs ± RL, RR ±, ± SW1, SW2 & ± the IC602 for IC701,
702 and 703 in each input function. If
there is no signal, check that the I2S audio signals were received at the IC602.
2)
Check PVDD_50V. If 50 V is abnormal,
check the SMPS.
3)
Check 12 for the operation of the IC AMP door.
A.
All voltages are normal, but +12 V is low, there is the possibility of being
damaged AMP IC.
B.
Remove a ferrite bead between FB703, FB707 and FB713 one by one.
By
removing the output choke if +12 V is recovered, it means the IC attached to it
is damaged.
Replace
the IC with a new one.
4)
Check the impedance between SPK + and GND and SPK - and GND.
A.
If the impedance is 0 Ω, the IC may have been damaged.
B.
After removing the heat sink, replace it with a new one.
If
an IC AMP among the three is damaged, "AMP_PDN" to R103 changes from
HIGH to LOW at regular intervals.
The
sound is not transmitted by turning off the AMP function.
NO
SOUND
If
there is no sound output on the AUX function, repair the machine according to
the instructions below.
AUX
IN FUNCTION
Solution
Check
and replace the IC202 on the motherboard.
How
to Solve Problems (countermeasures)
1)
Check the signs AUX_L/R IC202 (pin7, 8).
2)
Make sure ADC_BCK, ADC_LRCK & DAC_MCLK were inserted the IC501 to the
IC202.
3)
Make sure ADC_DATA was inserted into the IC202 to the IC501. If there is no signal, check for +5 V and
+3.3 V (ADC) on IC202. If NG, replace it with a new one.
4)
Check the signal flow after the I2S of IC501 to IC602. If there are any problems, check the power
for each IC. Food is normal, but if the signal waveform to the IC is distorted
or there is no sign, replace it with a new one.
5)
Make sure that the AMP block digital audio is good. If AMP is damaged, replace
it with a new one.
NO SOUND
If there is no sound output on the PORT function. IN, repair the machine according to the instructions below.
IN FUNCTION PORT IN
Solution
Check and replace the IC202 on the motherboard.
How to Solve Problems (countermeasures)
1) Check the PT_L / R signal from the main board to the USB board.
2) Check that comes PT_LR pin 1 and 3 of CN3M01 to Pin 1 and 3 CN202.
3) Check the signs POT_L / R for IC202 (Pin21, 22).
4) Make sure ADC_BCK, ADC_LRCK & DAC_MCLK are inserted from IC501 to the IC202.
5) Make sure ADC_DATA is entered from the IC202 to the IC501. If there is no signal, check for +5 V and +3.3 V (ADC) on IC202. If NG, replace it with a new one.
6) Check the I2S signal flow for ic602 IC501. If there are any problems, check the power for each IC. Foot is normal, but if the signal waveform to the IC is distorted or there is no sign, replace it with a new one.
7) Make sure that the AMP block digital audio is good. See tab "AMP AUDIO DIGITAL". If AMP is damaged, replace it with a new.
Contd:
