3.4.10 USB Circuit Failure
Check the voltage at Pin 6 of IC1A0 on the USB PWB and confirm that the voltage is approx. 5V.
NG
OK
Check the voltage at Pin 21 of IC1A0 on the USB PWB and confirm that the voltage is approx. 5V.
NG
OK
Check the reset voltage.
Expected failure point
1)
Peripheral circuits of Pin 2 of IC102 on the MAIN PWB
2)
Peripheral circuits of Pin 21 of IC1A0 on the USB PWB
3)
Between CN1A5 on the USB PWB and CN9A1 on the MAIN PWB
NG
OK
Confirm that the voltage of approx. 5V is generated at
each Pin 1 of CN1A1 to CN1A4 with UPSTREAM is
connected with the PC.
NG
OK
Check the voltage at each Pin 1 of CN1A1 to CN1A4 on the USB PWB.
Expected failure point
Q1A1 to Q1A4 on the USB PWB, peripheral circuits, or IC1A0
NG
OK
Check the waveform at Pins 28 and 29 of
IC1A0 on the USB PWB.
Expected failure point
IC1A0 on the USB PWB or peripheral circuits of Pins 28 and 29 of IC1A0
Confirm that the waveform of approx. 3.3Vp-p is
generated with UPSTREAM is connected with the PC.
Just the voltage level should be confirmed because the
waveform varies by the PC.
Confirm that the sinusoidal waveform of approx. 3 to 4Vp-p
is generated at the frequency of 6MHz with UPSTREAM is
connected with the PC.
Check the waveform at Pins 19 and 20 of IC1A0
on the USB PWB.
Expected failure point
X1A0 or IC1A0 on the USB PWB
Expected failure point
Pins 4, 5, 12, 13, 26, 27, 30 or 31 of IC1A0 on the USB PWB, peripheral circuits, or USB device
NG
OK
Connect the USB device with DOWNSTREAM
when UPSTREAM is connected with the PC, and
confirm that voltage of approx. 5V is generated at
each Pin 1 of CN1A1 to CN1A4.
Check the voltage at each Pin 1 of CN1A1 to CN1A4 on the USB PWB again.
Expected failure point
1)
Power circuit (See Item 3.4.1)
2)
Peripheral circuits of Q1A1 to Q1A4 and IC1A0on the USB PWB
3)
Between CN1A5 on the USB PWB and CN953 on the POWER PWB
Expected failure point
1) IC1A0 on the USB PWB
2) The PC or USB device may be uncongenial.
Check the 5V line.
3-28
Summary of Contents for DPro2070SB
Page 22: ...1 15 Fig 7 The principle of DDCC compensation ...
Page 23: ...1 16 Fig 8 a DDCC adjustment item ...
Page 24: ...1 17 Fig 8 b DDCC adjustment item ...
Page 25: ...1 18 Fig 9 DDCC circuit diagram ...
Page 103: ...4 Wave form 1 POWER 2 CONTROL MAIN 3 DEFL MAIN 4 DEFL SUB COIL DRIVE MAIN 5 VIDEO ...