Panasonic PT-VX505NU / PT-VX505NE / PT-VX505NEA / PT-VW435NU / PT-VW435NE / PT-VW435NEA Service Manual ▷ View online
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Lamp cover switch (SW901)
The lamp cover switch (SW901) cuts off the drive signal to the lamp
circuit when the lamp cover is removed or not closed completely.
After opening the lamp cover for replacing the lamp assy, place the
lamp cover correctly otherwise the projector can not turn on.
Thermal fuse (SW902)
There is a thermal fuse (SW902) inside of the projector to detect the
internal temperature rising abnormally. When the internal tempera-
ture around lamp reaches near 113˚C, the thermal fuse will open to
cut off the power supply to the lamp power circuit.
If the thermal fuse opens, the projector cannot turn on. Thermal
fuse replacement is required.
This projector provides the following circuit protections to operate in safety. If the abnormality occurs inside the pro-
jector, it will automatically turn off by operating one of the following protection circuits.
Fuse
(F601)
Circuit Protections
Fuse (F601)
A fuse is located inside of the projector. When the ON(G)/
STANDBY(R) indicator is not lighting, the fuse may be opened.
Check the fuse as following steps.
The fuse should be used with the following type;
Fuse Part No.: 423 035 3004
TYPE T8AH 250V FUSE
LITTEL FUSE INC. TYPE 0215008.MXEP
or
How to replace the fuse
1. The fuse is placed on the AC 1ST FILTER board. Remove the
cabinet top, MAIN&AV board following the "Mechanical Disas-
sembly" .
2. Take the fuse off , and replace the old one with the specified
type.
Fuse Part No, : 424 007 3909
TYPE 8AH 250V FUSE
SKY-GATE, Ltd. TYPE SG5013008P-R
Thermal fuse
(SW902)
(SW902)
Lamp cover switch
(SW901)
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Circuit Protections
The projector will be automatically turned off when the internal temperature of the projector is abnormally high, or the
cooling fans stop spinning, or the power supplies in the projector are failed.
Warning temperature and power failure protection
The projector is shut down and the WARNING indicator lights red.
When the projector detects an abnormal condition, it is automatically shut down to protect the inside of the projector
and the WARNING indicator lights red. In this case, unplug the AC power cord and reconnect it, and then turn the
projector on once again to verify operation.
WARNING
DO NOT LEAVE THE PROJECTOR WITH THE AC POWER CORD CONNECTED UNDER AN
ABNORMAL CONDITION. IT MAY RESULT IN FIRE OR ELECTRIC SHOCK.
4
Note:
- If the WARNING indicator lights red, it may defect the cooling fans or power supply circuits. Check fans operation
and power supply lines referring to the chapter “Power supply & protection circuit” and "Fan control circuit" in the
Chassis Block Diagram section.
When the temperature inside the projector reaches a certain level, the projector will be automatically shut down to
protect the inside of the projector and the WARNING and ON(G)/STANDBY(R) indicators start blinking. When the
projector has cooled down enough (to its normal operating temperature), the ON(G)/STANDBY(R) indicator stops
blinking and lights red, The projector can be turned on again by pressing the
button.
4
Note:
The WARNING indicator continues to blink even after the temperature inside the projector returns to normal. When
the projector is turned on again, the WARNING indicator stops blinking.
Check items
- Remove dust around the air filter.
- Ventilation slots of the projector are blocked. In such an event, reposition the projector so that ventilation slots are
not obstructed.
- Check if projector is used at higher temperature.
The projector is shut down and the WARNING indicator is blinking red.
LED indicator
WARNING
indicator
ON(G) / STANDBY(R)
indicator
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Maintenance
n
Outer Case
Wipe off dirt and dust using a soft dry cloth.
• If the dirt is persistent, soak the cloth with water and wring it thoroughly before wiping. Dry off the projector with a
dry cloth.
• Do not use benzene, thinner, or rubbing alcohol, other solvents, household cleaners, or chemical treated dusters.
Using them may cause deterioration of the outer case.
n
Front glass surface of the lens
Wipe off the dirt and dust off the front surface of the lens with soft clean cloth.
• Do not use a cloth that has an abrasive surface or a cloth that is moist, oily, or covered with dust.
• Do not use excessive force when wiping the lens as it is fragile.
Attention
The lens is made of glass. Impacts or excessive force when wiping may scratch its surface.
Please handle with care.
Before replacing the unit
When you perform maintenance or replacement of the parts, make sure to turn off the power and disconnect the
power plug from the wall outlet.
Maintenance
n
Replacement of the air filter unit (side)
1) Remove the air filter cover.
• Open the air filter cover in the direction of the arrow in
the figure and remove it.
2) Remove the air filter unit.
i) Hold the knob of the air filter unit and pull out in
the direction of the arrow, the top of the air filter
unit will pop up.
ii)Take out the air filter unit upwards.
• After removing the air filter unit, remove large
foreign objects and dust from the air filter
compartment and the projector’s air intake port
if there are any.
3) Insert the new air filter unit.
• Hold the air filter unit that the knob is outside of
the projector, perform Step 2) in the reverse order.
• Do not press the filter part when push into the
projector at last
4) Install the air filter cover.
• Make sure that the air filter cover is closed tightly
Replacing the unit
Replacement air filter unit: ET-RFV200
(a pair of air filter unit for back and side)
n
Air filter unit
Filter prevents dust from accumulating on the optical elements inside the pro-
jector. Should the filter become clogged with dust particles, it will reduce cool-
ing fans’ effectiveness and may result in internal heat buildup and adversely
affect the life of the projector. If a “Filter warning” icon appears on the screen,
replace the filter immediately.
Air filter cover (side)
Air filter unit (side)
Knob
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Maintenance
n
Resetting the filter counter
After replacing the air filter units, be sure to reset the filter
counter.
1) Press st to select [Filter counter reset].
2) Press the <ENTER> button.
[Filter counter Reset?] appears. Select Yes to con-
tinue. Another confirmation dialog box appears, select
Yes to reset the Filter counter.
Attention
• Turn off the power before you replace the air filter unit.
• When attaching the air filter unit, make sure that the
projector is stable, and work in an environment that is
safe, even in the event of the air filter unit dropping.
• Do not operate the projector with the filters removed.
Dust may accumulate on the optical elements degrad-
ing picture quality.
• Do not put anything into the air vents. Doing so may
result in malfunction of the projector.
• Do not wash the filters with water or any other liquid
matter. Otherwise the filters may be damaged.
n
Attaching the lens cap
When moving this projector or while not using it over an extended period of time, attach the lens cap.
To prevent loss for the lens cap, please according to the following procedures, attach the lens cap with the string of
accessories.
Thread the thinner end of the string through
1 1
the hole on the lens cap.
Thread the other end of the string through
2 1
the hole on the bottom of the projector.
Lens cap
String
n
Replacement of the air filter unit (back)
1) Remove the air filter cover.
• Open the air filter cover in the direction of the arrow in
the figure and remove it.
2) Remove the air filter unit.
• Hold the knob of the air filter unit and pull out in
the direction of the arrow.
• After removing the air filter unit, remove large
foreign objects and dust from the air filter
compartment and the projector’s air intake port
if there are any.
3) Insert the new air filter unit.
• Hold the air filter unit that the knob is outside of
the projector, perform Step 2) in the reverse order.
• Do not press the filter part when push into the
projector at last
4) Install the air filter cover.
• Make sure that the air filter cover is closed tightly
Air filter cover (back)
Air filter unit
(
back
)
Knob
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