Sharp DT-200, Service Manual

Page: 32 / 82

32
XV-Z90U
DT-200
»
Formatter Unit Troubleshooting -1/2
Abnormal picture
No
Yes
Rainbow-like colors on-
screen.
No proper matching in
red, green and blue.
Adjustments made on
"PROCESS MENU"
)
"DLP"
)
"INDEX", but
correction impossible.
Blackout
Are connections made
properly with the
SC9101 and SC9001
sockets?
Is the color wheel
running?
IC9101, IC9102 or their
peripheral circuit, or
color wheel defective.
Thick, white vertical
stripes (flashing).
No
Others
IC9003, IC9004, IC9006
or their peripheral circuit
defective.
Is connection made
properly with the
SC9001 socket?
No
Is the voltage at pin (3)
of IC9007 as specified
(+2.3V)?
Yes
Yes
Are there 400-MHz
sine-wave signals at
pins (18) and (20) of
IC9001?
Are there dust deposits on
DMD, formatter board and
cLGA contact terminal?
No
Refit the DMD, optical
mechanism and formatter
board PWB.
Yes
IC9301 or its peripheral
circuit defective.
Yes
No
No
Is the specified voltage
applied to the P9002
connector?
Yes
IC9003 and/or IC9004
defective.
Check the main PWB
and power unit.
Yes
No
Is the voltage at the
positive-polarity pin of
C9308 as specified
(+5V)?
Yes
IC9301 or its peripheral
circuit defective.
No
Is there 150-Hz pulse
signal at pin (2) of
P9003 with no signal
input?
Yes
Check the color wheel
sensor PWB.
No
Is the voltage at pin (9)
of IC9301 as specified
(+23 to +26V)?
Yes
No
Is the voltage at pin (13)
of IC9301 as specified
(—26V)?
Yes
IC9301 or its peripheral
circuit defective.
No
Is the voltage at pin (49)
of IC9301 as specified
(+7V)?
Yes
No
Is a lamp turned on?
Yes
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