21
DJS-1000
5
6
7
8
5
6
7
8
A
B
C
D
E
F
Other Trouble
No
Failure in IC2000 and peripheral circuit
U
S
B memory is not recognized (U
S
B-A)
Is the D+, D- line normal?
[Observation point
'
4
, waveform 2
3
]
No
Yes
Yes
Failure in IC400, IC401 and peripheral
equipment
Failure in the common mode filter(L401)
Failure in the U
S
BA connector(JA5
8
00)
Failure in the B to B connector(CN400, CN5
8
00)
Failure in IC2000 and peripheral circuit
Is the voltage of
V+5R2D_U
S
BA normal?
*1
(Disconnect the U
S
B memory)
Yes Failure in IC1600
No
Failure in JA1600, JA1601 and peripheral
circuit
No
Yes
MIDI connection is not available
Does it not work for
only MIDI THRU function?
Is the MIDI IN signal
(previos Photo-coupler) normal?
[Observation point
3
, waveform 21
]
No
Failure in IC2000 and peripheral circuit
Yes
Is the MIDI IN signal
(after Photo-coupler) normal?
[Observation point
9
, waveform 22
]
No
Failure in IC2000 and peripheral circuit
Failure in PC1600 and peripheral circuit
Yes
Is the MIDI OUT signal normal?
[Observation point
^
, waveform 20
]
*1: Refer to 10.
3
2 VOLTAGE
S
/ WAVEFORM
S
(QRT101
8
S
ERVICE MANUAL)
No
Internal memory cannot be accessed
Playing the sound souce?
(
S
tored in the intarnal memory)
No
Yes
Yes
Go to the "PC connection
is not available
(U
S
B-B)" flowchart
No
Firmware cannot be updated
No
Yes
Yes
Go to the "U
S
B memory
is not recognized
(U
S
B-A)" flowchart
Failure in IC1200
Failure in IC2000 and
peripheral circuit
Reading the U
S
B memory
by the BROW
S
E operation?
Failure in IC2000 and peripheral circuit
Failure in IC2000 and peripheral circuit
Is the value that
change setting by UTILITY is hold?
(Even after once again turn
on the power)
Failure in IC
38
00
Failure in IC2000 and
peripheral circuit
Whether the product is displayed
in the Device Manager of the PC?
(Connected the PC)
