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Refer to "B2 Protections" of A1 size diagram.
PERIPHERY OF CHASSIS
1. Is lamp cover of projector removed?
The interlock switch (SW902) cuts off the circuit of projector
from AC line when lamp cover is removed.
2. 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 it with a new fuse of the same
type.
TYPE 15.0A400V FUSE
SOC CORP. SHV14 15A N4
3. Is boss of lamp cover inside broken or not fitting?
Check the Interlock switch(SW902) and boss of lamp cover.
SW902
OPEN : abnormal
4. Are thermal switches(SW903~906) operating?
If a temperature on the periphery of lamp reaches 90*C or
100*C, the thermal switch will be turned off.
SW904 90*C
SW903/905/906 100*C
OPEN : abnormal
5. Is warning temperature indicator(red) flashing?
If a temperature of periphery of B-LCD panel reaches to
46~48*C the projector will be turned off and warning tem-
perature indicator is flashing.
Ass'y Power
1. Are the LAMP indicator(red) and READY indicator(green)
light?
If the LAMP and READY indicators are not illuminated,
check the primary circuit and S5V of standby power supply
circuit.
2. Check that the FAN ON signal is correct.
Pin 2 of K6E
H : ON
3. Check the signal at pin 5 of T621. (Switching power IC out-
put signal)
Ass'y Subpower
1. Check that the Vcc-voltages are correct.
2. Check that the POWER FAIL signal is correct.
Pin 7 of k66C
L : abnormal
3. Check that the POWER SW signal is correct.
Pin 19 of k66C
L : abnormal
4. Check that the Fan ON signal is correct.
Pin 1 of k66C
L : abnormal
5. Check that the +B(RL12) for PFC circuit.
Pin 9 of k66C
Ass'y Main
1. Check that the Vcc-voltages are correct.
2. Check that the POWER FAIL signal is correct.
Pin 125 of ic801
L : abnormal
3. Check that the POWER ON signal is correct.
Pin 5 of IC801
(Power on/off signal)
4. Check that the Fan ON signal is correct.
Pin 101 of IC801
(Fan on/off signal)
5. Check that the LAMP-1~4 signals are correct.
Pin 50~53 of IC1801
(PFC circuit on/off signals)
6. Check that the LAMP-1~4-ERR signals are correct.
Pin 54~57 of IC1801
(Lamp monitor signals)
7. Check that the BALLAST-SW-1~4 signals are correct.
Pin 2~9 of IC1826
(Lamp ballast on/off signals)
No power
Power on/off
Fan on/off
Lamp 1~4
Ballast sw 1~4
Power sw
OFF
Power sw
ON
Cooling time
400~600ms