-36-
NO POWER
1. Is fuse (F901) blown?
Fuse may be opened when either the LAMP indicator 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 fitting?
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 automatically.
SW902......................................... OPEN : abnormal
4. Is thermal switch(SW901) operating? (with the
WARNING TEMP. indicator flashing)?
If temperatures periphery of optical unit reaches
85˚C, the thermal switch will be turned off automatically.
SW901......................................... OPEN : abnormal
1. Are the LAMP indicator(red) and READY
indicator(green) light?
If the LAMP and READY indicators do not illuminated, check the primary circuit and S5V of standby
power supply circuit.
2. Check that the FAN DRIVE signal is correct.
Pin 3 of K6P.................................................. H : ON
3. Check that the LAMP BST-SW signal is correct.
Pin 2 of K6P.................................................. H : ON
4. Check that the 5V_SW signal is correct.
Pin 5 of K6P.................................................. H : ON
5. Check that the POWER FAIL signal is correct.
Pin 6 of K6P......................................... L : abnormal
6. Is thermal switch(TSW611) operating?
If temperatures periphery of P.F.C. circuit reaches
90˚C, the thermal switch will be turned on automatically.
TSW611 .................................... SHORT : abnor mal
7. Check the signal at pin 5 of T651. (Switching power
IC output signal)
POWER, P.F.C. BOARD
PERIPHERY OF CHASSIS
1. Check that the Vcc-voltage(+5V) is applied to pins 4,
5 of K30R and pins 61-64 of K30EE.
1. Check that the Vcc-voltage(+5V) is applied to pin 11
of IC1901, pin 38-40 of K15EE.
2. Check that the POWER FAIL signal is correct.
Pin 50 of IC1901.................................. L : abnormal
3. Check that the TEMP DET. signal is correct.
Pin 26 of IC1901, pin 4 of K5M ........... L : abnormal
4. Check that the LAMP DET. signal is correct.
Pin 27 of IC1901, pin 3 of K5A ........... H : abnormal
5. Check that the LAMP_SW signal is correct.
Pin 29 of IC1901........................................... H : ON
Pin 1 of K5A................................................... L : ON
6. Check that the 5V_SW signal is correct.
Pin 34 of IC1901, pin 5 of K5P..................... H : ON
7. Check that the FAN DRIVE signal is correct.
Pin 44 of IC1901, pin 3 of K5P..................... H : ON
8. Check that the LAMP BST_SW signal is correct.
Pin 54 of IC1901, pin 2 of K5P..................... H : ON
MAIN COMP-B BOARD
MAIN COMP-C BOARD
Troubleshooting