Pioneer DDJ-T1, Руководство по обслуживанию

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DDJ-T1
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A
B
C
D
E
F
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[7] Basic Operation Check of the MAIN_UCOM
N ote: First, check if the voltage at each section is OK.
1
GRID Operation
Check
(
N o operation
with keys, V Rs,
sliders, or LEDs)
UCOM Assy
Check the power to and the input/output
waveforms of the GRID IC (IC702)
If the waveform is not proper, check the GRID line
and the parts, such as resistors and capacitors.
If the output waveform is not proper, check item [2].
If nothing is wrong with the parts, the GRID IC
(IC702) or the MAI
N _UCOM (IC701) may be
defective.
2
UCOM Assy
Assy
corresponding
to each key
Check the output waveform of the GRID IC
(IC702), with the FFC cable of the UCOM
Assy disconnected.
If the waveform returns to normal, the PCB Assy that
is connected with the UCOM Assy via the FFC cable
may be defective.
If the waveform does not return to normal, the GRID
IC (IC702) may be defective.
3
KEY Buffer
operation (key
input disabled)
UCOM Assy
Check the power supply to the KEY Buffer
ICs (IC1101 and 1102) and the input/output
waveforms when a key is pressed.
If the input waveform appears but the output
waveform does not when a corresponding key is
pressed, the KEY Buffer ICs (IC1101 and 1102) may
be defective.
If the input waveform does not appear when a
corresponding key is pressed, check item [4].
N o operation
button is
effective.
4
UCOM Assy
Assy
corresponding
to each key
Check the connection of the FFC cable.
Check also the key input circuit of the PCB
Assy connected.
If the key input circuit of the board connected is
normal, the KEY Buffer ICs (IC1101 and 1102) may
be defective.
10.7 UCOM
ASSY (6/6)
No. Cause/Symptom Point to be checked
Item to be checked How to distinguish a defective point and/or corrective action Reference
10.17 WAVEFORMS
GRID control 1,
GRID control 2
10.17 WAVEFORMS
GRID control 1,
GRID control 2
10.17 WAVEFORMS
KEY operation 1,2