80
MEP-7000
1
2
3
4
A
B
C
D
E
F
1
2
3
4
Check the voltages (V+3R3D,
V+3R0D, and V+CORE1R5D) of
the video encoder (IC1600).
If power is not supplied, check the connection
of the power line.
If the video encoder is judged as
N
G
If the CE
N
TER PA
N
EL microcomputer is judged as
N
G
If the A/B SIDE PA
N
EL microcomputer is judged as
N
G
No.
Waveform
Items for check
Causes and measures
Points to be checked
1
Check the waveforms of the
following communication signals:
• V_RST#
• VIDEO_CS#
Check the waveforms (SCK,
MOSI, and MISO) of the 3-wire
serial cable.
If waveform is not normal, check the mounting
status of the output signal terminal of the
CPLD (IC1700). If it is properly mounted, it is
defective; replace it.
2
THE VIDEO
E
N
CODER
If the problem is not resolved
even after the above-mentioned
measures are taken.
If the problem is not resolved
even after the above-mentioned
measures are taken.
Replace the
N
MAI
N
Assy.
If waveform is not normal, check the mounting
status of the output signal terminal of the
N
ORTH CPU (IC601). If it is properly mounted,
the port connector may be defective; replace it.
3
-
-
-
-
-
Check the voltage (V+3R3D) of
the CE
N
TER PA
N
EL µ.com
(IC
8
00).
If power is not supplied, check the connection
of the power line.
1
Check that the clock (9 MHz)
signal is input to the CE
N
TER
PA
N
EL µ.com (IC
8
00).
2
Check the waveforms of the
following communication signals:
W
aveform of signal output from
the
N
ORTH CPU (IC601)
•
W
aveforms (SCK, MOSI, and
MISO) of the 3-wire serial cable
W
aveform of signal output from
the CPLD (IC1700)
• RST_PL#
• PA
N
EL_CS#
If the waveform is abnormal, check the
mounting status of the terminals. If they are
properly mounted, then they are defective;
replace them.
3
117
122
102
115
115,
121
Check the voltage (V+5D) of the
A/B SIDE PA
N
EL µ.com
(IC2600).
If power is not supplied, check the connection
of the power line.
-
If the problem is not resolved
even after the above-mentioned
measures are taken.
Replace the SIDE PA
N
EL µ.com (IC2600).
Replace the CE
N
TER PA
N
EL µ.com (IC
8
00).
1
Check if the FFC cable is
securely connected between the
N
MAI
N
ASSY and the DISP
ASSY.
If a connection is loose, firmly connect the
cables.
Check that the clock (10 MHz)
signal is input to the SIDE
PA
N
EL µ.com (IC2600).
2
Check the waveforms of signals
on the communication lines
between the
N
ORTH CPU
(IC601) and the following
devices:
• P
N
L_I
N
• P
N
L_FS
• P
N
L_CLK
• P
N
L_OUT
• P
N
L_RST#
Check the waveforms of output signals,
referring to the block diagram of serial commu-
nication. If a communication line is interrupted
at buffer ICs (IC603-IC606), check the
mounting status of the ICs. If they are improp-
erly mounted, resolder them. If the problem is
not resolved, replace the ICs.
3
4
4
5
116,
135
120,
13
8
4
CE
N
TER
PA
N
EL
µ.com
A/B SIDE
PA
N
EL
µ.com
If the clock signal is not input, the crystal
oscillator (X700) and its peripheral chips may
be defective or improperly mounted. Resolder
them. If the problem is not resolved, replace
them.
If the clock signal is not input, the crystal
oscillator (X2600) and its peripheral chips may
be defective or improperly mounted. Resolder
them. If the problem is not resolved, replace
them.
