68
MEP-7000
1
2
3
4
A
B
C
D
E
F
1
2
3
4
Check the voltage at the two
electrodes of the protectors (P10
and P11).
If there is a potential difference, the protector
may be damaged. Replace it.
-
No.
Waveform
Items for check
Causes and measures
Points to be checked
[5-2] Too low or distorted audio output leve
1
SJACK ASSY
Check that the LED for the
PO
W
ER key on the front panel is
lit.
If it is not lit, the cable connecting the SMAI
N
and EJTB Assys is not firmly plugged into the
connector of the SMAI
N
Assy. Reconnect the
cable.
The LED for the EJECT key does not light.
-
No.
Waveform
Items for check
Causes and measures
Points to be checked
[5-4] LEDs not lit
1
DRIVE U
N
IT
Check the voltage at the two
electrodes of the LED.
If the voltage in the normal direction is in the
range of 2.2-2.7 V, the LED is defective;
replace it. If the voltage is outside the above
range, the transistor is defective; replace it.
-
3
EJTB ASSY
Check the signal at Pin 2 or 5 of
C
N
350 on the SMAI
N
Assy.
-
2
SMAI
N
ASSY
Check if the PO
W
ER LED on the
front panel is lit.
If it is not lit, the cable connecting the SMAI
N
Assy with the EJTB Assy is not securely
connected to the SMAI
N
Assy. Reconnect the
cable.
The EJECT key does not function.
The USB STOP key does not function.
-
No.
Waveform
Items for check
Causes and measures
Points to be checked
[5-3] The keys do not function.
1
DRIVE U
N
IT
If the problem is not resolved, the
S
W
may be defective or improp-
erly mounted.
Replace the S
W
.
-
4
EJTB ASSY
The S
W
may be defective or
improperly mounted.
Replace the S
W
.
-
3
FS
W
B ASSY
Check the input signal at Pin 4 or
6 of C
N
350 on the SMAI
N
Assy.
If there is an input signal, check the mounting
status of EXP.I
N
1 (IC354). If it is properly
mounted, the port connector may be defective;
replace it.
If no signal is input, go to [3].
-
2
SMAI
N
ASSY
Check the input signal at Pin 7 or
8
of C
N
350 on the SMAI
N
Assy.
If there is an input signal, check the mounting
status of EXP.I
N
1 (IC354). If it is properly
mounted, the port connector may be defective;
replace it.
If no signal is input, go to [2].
If there is an no signal, check the mounting
status of AUDIO DSP (IC501). If it is properly
mounted, the port connector may be defective;
replace it.
If signal is input, go to [3].
-
-
1
SMAI
N
ASSY
Check if the cable connecting the
SMAI
N
Assy with the EJTB Assy
is securely connected to the
EJTB Assy and if there is
breakage in the cables.
If a connection is loose, firmly connect the
cables.
If there is breakage, replace the Cable.
-
3
CABLE
Check if the FFC that connect the
SMAI
N
and EJTB Assys,EJTB
and FS
W
B Assys are securely
connected and if there is break-
age in the cables.
If a connection is loose, firmly connect the
cables.
If there is breakage, replace the Cable.
2
CABLE