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Troubleshooting
NO POWER
PERIPHERY OF CHASSIS
1. Is fuse (F601) blown?
Fuse may be opened when either the LAMP indica-
tor or the READY indicator isn't Illuminated. Check
the fuse.
● For continued safety, replace with a fuse of the
same type.
TYPE T4.0AH 250V FUSE. (LITTLE FUSE INC.
TYPE 215004)
2. Is projection of lamp cover inside broken or not fit-
ting?
Check the INTER LOCK switch(SW904) and lamp
cover.
SW904 ......................................... OPEN : abnormal
3. Is thermal switch(SW902) operating?
If temperatures periphery of lamp house reaches
100˚C, the thermal switch will be turned off automat-
ically.
SW902 ......................................... OPEN : abnormal
4. Is the WARNING TEMP. indicator flashing ? The
thermal sensor IC (IC2832) on the Temp. board or
IC2831 on the main board may detect the abnormal
temperature inside of the projector. If one of these
ICs detects the abnormal temperature, this projector
will be turned off automatically.
POWER BOARD
1. Are the LAMP indicator(red) and READY
indicator(green) light?
If the LAMP and READY indicators do not illuminat-
ed, check the primary circuit and S6V of standby
power supply circuit.
2. Check that the LAMP BST-SW signal is correct.
Pin 12 of K6K ............................................... H : ON
3. Check that the 5V_SW signal is correct.
Pin 11 of K6K ............................................... H : ON
4. Check that the POWER FAIL signal is correct.
Pin 13 of K6K ....................................... L : abnormal
5. Is thermal switch(TSW611) operating?
If temperatures periphery of P.F.C. circuit reaches
95˚C, the thermal switch will be turned on automati-
cally.
TSW611 .................................... SHORT : abnormal
6. Check the signal at pin 5 of T651. (Switching power
IC output signal)
MAIN BOARD
1. Check that the 15.5V is observed at pins 1-3 of K3C.
2. Check that the 6V is observed at pins 6-8 of K3C.
3. Check that the -5V is observed at pin 9 of K3C.
4. Check that the 5V is observed at pins 10-11 of K3C.
5. Check that the 6V is observed at pins 2-4 of K3D.
6. Check that the 15.5V is observed at pins 7-8 of K3D.
7. Check that the 5V_SW signal is correct.
Pin 11 of K3D................................................ H : ON
8. Check that the LAMP BST_SW signal is correct.
Pin 12 of K3D................................................ H : ON
9. Check that the POWER FAIL signal is correct.
Pin 13 of K3D ...................................... L : abnormal
10. Check that the 12V is observed at test points
TP6101. TP6102 and TP6103.
11. Check that the LAMP_SW signal is correct.
Pin 4 of K8CC ............................................. H : On
12. Check that the LAMP_ERR signal is correct.
Pin 1 of K8CC .............................................. L : On
13. Check that the POWER FAIL signal is correct.
Pin 2 of IC1851.................................. L : abnormal
14. Check that the Sensor IC(IC2831) detects abnor-
mal temperature inside the projector.
COMPONENT BOARD
1. Check Power Supply and switching circuit
Check ICs
2. Check that the POWER FAIL signal is correct.
Pin 11-12 of K3A ................................. L : abnormal
3. Check that the FAN_DRIVE signal is correct.
Pin 7-8 of K3A ............................................... H : On
-34-
IC2641 to IC2691
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