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This projector provides a function which can be specified a defective area simply by indicating the LEDs on the control
panel. Connect the AC cord and turn the projector on and then check the LED indication.
No Power
POWER (red) and
WARNING (red)
indicators are
lighting?
Yes
Check power supply lines, S5V, -5V, 17.5V, etc. on the Main board.
- Refer to the diagram "Power Supply Lines".
An abnormality
occurs on the sec-
ondary power sup-
ply lines
Power failure detection diodes detect the fan operation stop.
Check FN901/902/903/904/905 and peripheral circuit.
Check connectors K8E/K8F from TH901/TH902.
- Refer to the diagram "Fan control circuit".
An abnormality
occurs on the fan
control circuits.
Check power starter signals as follows:
- STANDBY_SW signal (Power-on:H) is output from pin 9 of IC4801 and
sent to the Power Board and 17.5V, S16V_F, 6.5V, S5V, -5V lines are sup-
plied.
- POWER_ON_SW signal (Power-on:H) is output from pin 25 of IC301 and
sent to the Power Board and lamp ballast 375V line is supplied.
- 3.3V_SW signal (Power-on:H) is output from pin 346 of IC301 and sent to
IC7601, 7611 then 3.3V, 1.0V lines are supplied.
- PANEL_15V_PWR_SW signal (Power-on:H) is output from pin 140 of
IC301 and sent to IC7621, then 15V line is supplied.
- FAN_SW signal (Power-on:H) is output from pin 437 of IC301 and applied
to the Fan power supply circuit.
- IRIS_PWR_ON signal (Power-on:H) is output from pin 143 of IC301 and
applied
- FILTER_OUT_SENS, FILTER_IN_SENS signal (Power-on:H) is output from
pin 39, 257 of IC301 and applied
An abnormality
occurs on power
starter signals.
Check following
items
The symptom indicates that the projector detected an abnor-
mality in the cooling fan operation or in the power supply sec-
ondary circuits. Check fan operation and power supply lines,
and the driving signal status.
- POWER_FAIL (Error:L) signals are sent to IC301, then IC301 shuts
down the power supply circuit.
Does a indicator flash or
light?
The primary power supply circuit does
not operate properly.
Check Varistor (VA611).
Check Power Board or Eco
Power Board
Is fuse (F601) broken?
Check SS3.3V power supply line from the
Eco Power board.
- When the main power switch is ON,
SS3.3V line is supplied to IC4801(Sub CPU).
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POWER
red/green
Indicators
WARNING
red
Yes
No
Yes
No
troubleshooting
Troubleshooting
