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NO SOUND
There is no sound output in the USB FUNCTION, repair the set according to the fol-
lowing guide.
6-2-2. IN THE USB FUNCTION
6-2-2-1. Solution
Please check and replace IC501, IC504 on MAIN board & IC3U01 on USB board.
6-2-2-2. How to troubleshoot (Countermeasure)
1) Check +5VU to USB board.
If +5.6VA to pin1 or pin2 of CN3U1.
2) Check USB D± from main board to USB board.
a. Check USB_HUB_DN/DP signals to IC501(Pin16, 18)
b. Check USB1/2_DN/DP signals from IC504 to CN502 (Pin1, 2, 4, & 5)
If there is any trouble, check the power for each IC. The power is normal but , if the signal waveform to
the IC is distorted or no signal, replace it with a new one.
3) Check if "Digital audio AMP block" Item 6-3 is normal.
6-2-2-3. Service hint (Any picture / Remark)
IC504
USB2512A
DAC_MCLK
ADC_DATA
IC501
MLC3700
DAC_DATA
DAC_MCLK
IC801
BEAT_DATA
FS503B
BEAT BOX
< USB function signal fl ow >
ONE POINT REPAIR GUIDE
USB_D
USB
Board
DAC_BCK
IC602
DAC_LRCK
PS9854
PWM
USB
AMP IC
TAS5631
< Waveform of USB D± signal >
3-26
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