61
MEP-7000
5
6
7
8
5
6
7
8
A
B
C
D
E
F
No.
Waveform
Items for check
Causes and measures
Points to be checked
1
-
2
3
4
5
6
7
An image is displayed on the center display but not on the monitor connected via MO
N
ITOR OUT.
-
CO
N
TROL
U
N
IT
N
MAI
N
ASSY
N
MAI
N
ASSY
N
MAI
N
ASSY
N
MAI
N
ASSY
12
8
~
133
126,
127
114
123
[3-3] If the display on the center display or the monitor connected via MONITOR OUT is abnormal
-
-
1
1
-
152,
153
1
-
Cable
[3-4] The controller A/B display (DISP Assy) has not started. (OEL, LEDs not lit)
[3-5] The OEL is not lit
-
-
150
No.
Waveform
Items for check
Causes and measures
Points to be checked
No.
Waveform
Items for check
Causes and measures
Points to be checked
No.
Waveform
Items for check
Causes and measures
Points to be checked
Check that the UTILITY monitor
out setting is set to O
N
.
Check the status of the video
encoder with the auto device
diagnosis, the status LEDs, or the
pulse waveform.
Monitor out O
N
/OFF can be set on the menu.
If the video encoder (IC1600) is judged as
N
G,
it has not been correctly started up. See “[
8
]
Auto Device Diagnosis/Status LEDs” in this
section.
Check the waveform of the
VIDEO OUT signal.
Check the point where the VIDEO OUT signal
is interrupted, by inspecting the waveform. If
the signal is interrupted at VIDEO AMP
(IC1603), go to [4]. If the signal is interrupted at
the video encoder (IC1600), go to [5].
Check the input/output signal to
VIDEO AMP (IC1603).
Check the mounting status of the VIDEO AMP
(IC1603). If it is properly mounted, it may be
defective; replace it.
Check if the V_RST# and
DATAE
N
V signals are output from
the CPLD (IC1700) and input to
the video encoder (IC1600).
If there is no signal output, check the mounting
status of CPLD (IC1700). If it is properly
mounted, the port connector may be defective;
replace it.
If only the display (1) is abnormal, poor
connection between the
N
ORTH CPU (IC601)
and the video encoder (IC1600) is suspected.
Check the mounting status of the
N
ORTH CPU
(IC601). If it is properly mounted, it may be
defective; replace the
N
MAI
N
Assy.
If both displays (1) and (2) are abnormal, poor
con-nection after the video encoder (IC1600) is
suspected. Check the mounting status of
VIDEO AMP (IC1603) or its peripheral parts. If
they are properly mounted, they may be
defective.
Replace the
N
MAI
N
Assy.
If the problem is not resolved
even after the above-mentioned
measures are taken
On the monitor connected via
MO
N
ITOR OUT, compare the
displays of (1) VRAM TEST
PATTER
N
(F1 key) and (2) TV
TEST PATTER
N
SETTI
N
G
(F2 key) in Service mode for the
control unit, and check which one
flickers: (1): This test pattern
video signal is output from the
N
ORTH CPU (IC601). (2): This
test pattern output signal is a
video signal built into the video
encoder (IC1600).
If the SIDE PA
N
EL microcomputer (IC2600) is
judged as
N
G, it has not properly started up.
See “[
8
] Auto Device Diagnosis/Status LEDs”
in this section.
If a connection is loose, firmly connect the
cables. If there is breakage, replace the cable.
Check the status of the SIDE
PA
N
EL microcomputer with the
auto device diagnosis or the
status LEDs.
Check if the cables that connect
the DISP and OELB Assys are
securely connected and if there is
breakage in the cables.
Replace the M
N
AI
N
ASSY.
Check if the clock signal (27
MHz) is input to the video
encoder (IC1600).
As this clock signal is for video output signals,
connection disruption cannot be detected by
auto device diagnosis. Check the mounting
status of the crystal oscillator (X1600) and its
peripheral devices. If they are properly
mounted, they may be defective; replace them.
