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Troubleshooting
No Power
This projector provides a function which can be specified a defective area simply by indicating the LEDs on the con-
trol panel. Connect the AC cord and press the Power button once and then check the LED indication.
- When all the LED indicators are not lighting, the symptom indicates that the primary power supply circuit
does not operate properly. Check the power primary circuit and parts as follow;
AC cord, F601 (Fuse), Power board, SW902 (Thermal sw.)
SW902 opens when the surrounding temperature of the switch exceeds 90°C.
- When the WARNING(red) and POWER(red) indicators are flashing, the symptom indicates that the projec-
tor detected an abnormal temperature risen inside the projector. Check the air filters and remove the object
near the intake and exhaust fan openings, and wait until the POWER indicator stops flashing, and then try to
turn on the projector.
The internal temperature is monitored by sensor ICs, IC8811, IC8821 and IC8831 on the Main Board.
- When the WARNING (red) indicator lights, the symptom indicates that the projector detected an abnormality
in the cooling fan operation or in the power supply secondary circuits. Check fan operation and power supply
lines, and the driving signal status.
An abnormality occurs on the secondary power supply lines.
Power failure detection diodes detect abnormal voltage on the power supply circuits.
POWER_FAIL (Error:L) signals are sent to pin 174 of IC301(System Controller) via IC1871(Comparator).
Check the shortage of secondary circuits, ICs, condensers, etc.
Check power supply lines, 15VP, 9V, 12V, 3.3V and 1.8V, 5V_AUDIO, S5V on the Main Board.
An abnormality occurs on the fan control circuits.
Power failure detection diodes detect the fan operation stop. Check FN901, FN902, FN903, FN904, FN905,
FN906 and peripheral circuit.
Check fan's power supply lines and detection diodes D3616 and D3614.
Check fan lock signal(Lock:H) and Q3601, D3617 and peripheral circuit.
An abnormality occurs on power starter signals (ON_5VA, ON_3.3V, ON_15V, LAMPDC_ON, DC_ON).
LAMDC_ON signal (Power-on:H) is output from pin 15 of IC1803 and applied to PC643 on the Power
Board. It drives the power oscillation circuit and power supply in the Power Board.
DC_ON signal (Power-on:H) is output from pin 16 of IC1803 and switches Q661<15.5V> on/off.
ON_15V signal(Power-on:H) is output from pin 72 of IC301 and sent to Q2501, then 15VL line is supplied.
ON_5VA signal(Power-on:H) is output from pin 71 of IC301 and sent to IC5081 and Q3582 to switch power
supply 5V_AUDIO and 5VA.
- When the projector switches into the standby mode.
An abnormality occurs on Lamp drive signal (LAMP_POW, LAMP_ERR).
- LAMP_POW signal(Power-on:H) is output from pin 140 of IC301 and sent to IC4811 via IC4852.
SCEL signal(Lamp-on:L) is output from pin 2 of IC4811 via IC4801 and sent to Lamp Ballast Unit through
SW901(Lamp Cover SW).
- TXL signal is output from pin 12 of IC4811 and sent to Lamp ballast Unit via IC4801.
(TXL signal is applied for lamp power control. Lo: Low power, Hi: High power)
- RXL signal(Lamp status signal) is output from Lamp Ballast Unit and sent to pin 9 of IC4811 via IC4801,
then LAMP_ERR signal is output from pin 3 of IC4811 and sent to IC301 via IC1811.
If an abnormality occurs on the lamp ballast unit, RXL signal and LAMP_ERR signal become "H" and then
IC301 sets the projector into the standby mode..
Lamp Cover switch
Make sure that the lamp cover is mounted correctly. If not or
the lamp cover removed, the lamp does not light on for the
safety. Check the lamp
cover and lamp cover
switch (SW901).
short in normal
Reset switch
The microprocessor inside the projector may occasionally
malfunction
and
does not accept
any controls. In
this case, press
the reset switch on
the rear panel with
a sharp tool to
restart the projec-
tor.
-38-
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