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Troubleshooting
No Power
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).
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When all of 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,
SW90 (Thermal sw.) ............... short in normal
SW90 opens when the surrounding temperature of the switch exceeds 85°C.
This projector provides a function which can be specified a defective area simply by indicating the LEDs. Connect the
AC cord and press the Power button once and then check the LED indication.
-
When the WARNING (red) and POWeR (red) indicators are blinking
, the symptom indicates that the projector
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 blinking, and then try to turn on the
projector.
The internal temperature is monitored by sensor ICs, IC881 on the Main board and IC8811 on the Temp Sen-
sor A board, IC8831 on the Temp Sensor C board.
-
When the WARNING indicator lights red
, 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.
The P_FAIL signal (Error: L) is sent to pin 15 of IC301<Scaler> when the abnormality occurred inside the
projector, and then the IC301 sends the shutdown signal, LAMP_DC_ON, to the power supply circuit to stop its
operation, and signal LAMP_SCI to the lamp ballast board via IC4891 and SW901<lamp cover switch> to stop
operation of the lamp circuit.
An abnormality occurs on the secondary power supply;
Check power supplies S16V, S6V, S-5V. P_FAIL signal becomes “Low” when the abnormality occurs on any of
the power supply lines.
An abnormality occurs on the fan control circuit;
Check FN901, FN90, FN903, FN904, FN905, FN906, FN907 and peripheral circuit.
If any of the fans has an error, the fan lock signal drives Q3601 becomes "High". As the result, signal FAN_ERR
becomes Low and is sent to lamp ballast board to stop lamp circuit.
An abnormality occurs on the drive signals;
ON_150V signal (Power-on: H) is output from pin 95 of IC301 and switches IC59,15.5V_PNL supply circuit.
ON_33V signal (Power-on: H) is output from pin 188 of IC301 and switches IC561, 1.0V and Q358 3.3V sup-
ply circuit. ON_50V signal (Power-on:H) is output from pin 419 of IC301 and switches IC554, 1V supply circuit.
ON_16V signal (Power-on:H) is output from pin96 of IC301 and switches Q5701, S-5V supply circuit.
LAMP_DC_ON signal (Power-on: H) is output from pin 89 of IC301 and supplied to the P.F Control IC, IC61,
on the power supply board through PC661.
LAMP_SCI signal (Power-on: H) is output from pin 14 of IC9885 and applied to pin of IC4891 and out put pin
4 and then supplied to the lamp ballast board through SW901<Lamp Cover SW>.
LAMP_DET signal at the pin 85 of IC301 is applied from the lamp ballast unit. If the abnormality occurred on
the lamp ballast unit, LAMP_DET signal becomes “High” and then IC301 shuts down the power supply circuit.
Summary of Contents for PRM-30A
Page 58: ... 58 IC Block Diagrams L3E07111 Digital Gamma and Driver IC401 LC87F2G08A PIC Micom IC9885 ...
Page 59: ... 59 IC Block Diagrams MR4010 Power OSC IC631 NJW1156 Audio Selector IC5001 ...
Page 87: ...Key No Part No Description Key No Part No Description 87 Electrical Parts List KJ8 30A00 ...