24
DJM-850-K
1
2
3
4
A
B
C
D
E
F
1
2
3
4
1-37
1-40
1-41
1-31
1-31 1-32 1-33
1-32
1-33
2-4
1-40
1-37
1-3
8
1-3
8
1-39
1-39
3
Loose connection
/defective parts
MAI
N
Assy
IC2401
96k CLK: pin 10
6M CLK: pin 12
24M CLK: pin 11
[Checking the ADC block]
Check for the CLK signal of ADC (IC2401).
• If no CLK signal is input, go to [7].
• If the CLK signal is input, go to [4].
10.35
W
A
V
EFORMS
4
Loose connection
/defective parts
MAI
N
Assy
IC2401 pin 9
[Checking the ADC block]
Check for the signal output from
ADC (IC2401) output terminal.
• If output signal cannot be confirmed, ADC
may be defective.
Check for the status of soldering and replace it.
• If output signal can be confirmed, DSP
(IC3201) must be improperly soldered or
defective.
10.35
W
A
V
EFORMS
5
Loose connection
/defective parts
MAI
N
Assy
IC2
8
04 pin10, pin
8
[Checking the RESET signal path]
Check for the RESET signal.
• If the signal level at Pin 10 is H and that at
Pin
8
is L, IC2
8
04 must be soldered
impropely or defective.
• If the signal level at Pin 10 is L and there is no
abnormality in the path from the MAI
N
UCOM
(IC2
8
03) to IC2
8
04, soldering of the MAI
N
UCOM
(IC2
8
03) or this IC itself is defective.
—————
6
Loose connection
/defective parts
MAI
N
Assy
96k CLK: IC3006
pin 10, pin
8
6M CLK: IC3004
pin 10, pin
8
24.576M CLK: IC3005
pin 10, pin
8
[Checking the CLK signal path]
Check for the 96k CLK, 6M CLK and
24M CLK signals.
• If no signal is output from Pin
8
even though
Pin 10 is normal, soldering of the IC3006/
IC3004/IC3005 or these ICs themselves are
defective.
• If Pin 10 is not normal and if there is no
abnormality in the path from the FPGA
(IC3007) to IC3006/IC3004/IC3005, soldering
of the FPGA (IC3007) or this IC itself is
defective.
10.35
W
A
V
EFORMS
1
Loose connection
/defective parts
I
N
PUT Assy
C
N
4
8
03 pin 20
Check that the RETUR
N
I
N
signal level
is H.
• If it is L, JA4401 or R4
8
03 must be
improperly soldered or defective.
• If it is H, go to [2].
—————
[2-3] No signal is input to the RETURN.
0
Prior
Confirmation
DELAY, ECHO,
UP ECHO, SPIRAL,
RE
V
ERB, TRA
N
S,
FILTER, FLA
N
GER,
PHASER, ROBOT,
SLIP ROLL, ROLL,
RE
V
ROLL, S
N
D/RT
N
selector switch
/ O
N
/OFF button
• Check that the type for BEAT EFFECT
is set to S
N
D/RT
N
.
• Check that the BEAT EFFECT is set
to
O
N
.
• Check that a cable is connected to the
RETUR
N
L connector.
—————
Operating
instructions
1
Loose connection
/defective parts
MAI
N
Assy
IC2401
MIC1: pin 1
MIC2: pin 2
[Checking the ADC block]
Check for an audio signal at the input
connector of ADC (IC2401).
If no audio signal is input to ADC, a problem in
an analog circuit at a previous stage may be
suspected.
• If an audio signal is input, go to [2].
• If no audio signal is input, check for a part
where the signal is interrupted, by observing
the audio signal in the path from the input
connector to the ADC, then check the
soldering status and check for a defective
part in the corresponding part.
10.35
W
A
V
EFORMS
2
Loose connection
/defective parts
MAI
N
Assy
IC2401 pin 13
[Checking the ADC block]
Check for the RESET signal of ADC
(IC2401).
• If the RESET signal level is L, go to [5].
• If the RESET signal level is H, go to [3].
—————
1-34
1-34
1-35
1-35
[2-2] No signal is input to the MIC1/MIC2 connectors.
0
Prior
Confirmation
OFF, O
N
, TALK O
V
ER
selector switch
/ TRIM control
Confirm on the screen that the selector
is set properly.
—————
Operating
instructions
No.
Cause
Diagnostics Point
Item to be Checked
Corrective Action
Reference
No.
Cause
Diagnostics Point
Item to be Checked
Corrective Action
Reference
