Problem Diagnostics - ViewSonic PJ750 User Manual

Problem Diagnostics

Before requesting repair, please check the following chart. If the situation cannot be corrected, then
contact your dealer.
Phenomenon
The power does not
come ON.
No sound or
pictures are
displayed
Pictures are
displayed, but no
sounds are heard
Sounds are heard,
but no pictures are
displayed
Colors have a faded-
out appearance.
Color tone is poor
Pictures appear dark
Pictures appear
blurry
NOTE:
When the interior becomes overheated, power to the unit automatically shuts down. Press the main
switch on the side of the unit to the off position then wait 20 minutes to allow the unit to cool down
before any work is done to the unit.
Cases not involving a machine
defect
The main power source is not ON.
The electrical power cord is not
plugged in.
The main power source has been
interrupted during operation, such as
by a power outage (blackout), etc.
The input changeover settings are
mismatched.
The input changeover settings are
mismatched.
No signal is being inputted.
The electrical wiring to this unit is not
correctly connected..
The volume setting has been set at
(or adjusted to) an extremely low
level.
Mute is turned on.
The electrical wiring to this unit is not
correctly connected.
The brightness setting has been set
at (or adjusted to) an extremely low
level.
The lens cap has not been removed. Remove the lens cap.
Color depth setting or color tone set-
ting
The brightness setting and/or con-
trast setting has not been properly
adjusted.
The WHISPER mode is the current
setting.
Lamp is approaching the end of its
product lifetime.
Either the FOCUS setting or the H
PHASE is not properly adjusted.
Items to be confirmed
Turn on the main power.
Correctly connect the power cord.
Be sure to press the "O" (power OFF) sideof
the main power switch, and leave it OFF for
approximately 20 minutes. After the unit
has sufficiently cooled, turn ON the power
source.
Select the input signal then correct the set-
tings.
Correctly re-connect the connection cord.
Correctly re-connect the connection cord.
Correctly re-connect the connection cord.
Adjust the VOLUME setting to a higher
level.
Press the MUTE button to toggle the MUTE
mode setting.
Correctly re-connect the connection cord.
Adjust the BRIGHT setting to a brighter
level.
Perform picture adjustments by changing
the COLOR BAL R, the COLOR BAL B,
and/or the TINT settings, etc.
Perform picture adjustments by changing
the BRIGHT and/or CONTRAST settings,
etc.
Toggle from the WHISPER mode.
Replace the Lamp Assembly.
Adjust the focus and H PHASE settings.
ViewSonic PJ750
33